accelerator physics summary & report on uclc + lcrd r&d program alcpg04 - slac george gollin

Accelerator Physics Summary&Report on UCLC + LCRD R&D ProgramALCPG04 - SLACGeorge GollinUniversity of IllinoisJanuary 10, 2004

background image:Halbach permanent magnet quadrupole field, J. Rosenzweig, UCLA

OutlineStatus of UCLC, LCRD accelerator physicsOverview of UCLC and LCRD accelerator physics projects, as well as ALCPG04 accelerator physics working group presentationsbeam dynamics & simulationdamping ringssystems & instrumentationrf & accelerating structuresbeam delivery & IRsources

Profiles of requested funding

ALCPG04 Accelerator R&D summary

Brief UCLC + LCRD historyAt UC Santa Cruz (July, 2002): DOE, NSF declared $400k, $500k as accelerator funding goals.USLCSG organized schedule for proposal submisxsion and review A University Program of Accelerator and Detector Research for the Linear Collider ( Big Document) sent to DOE, NSF October 24, 2002. 33 accelerator, 38 detector proposals, 47 universities, 6 labs, 297 authors, 545 pages.accelerator support requests: $625k LCRD, $379k UCLCProfiles of requested funding

background image: copies of Big Doc on its way to Washington

The startup has been bumpyProfiles of requested funding


Starting up; renewal proposalsProfiles of requested funding

Most groups have started their projects, in spite of budget glitches.Renewal/resubmission: autumn, 2003.A University Program of Accelerator and Detector Research for the Linear Collider, volume II sent to DOE, NSF November 24, 2003. 29 accelerator, 39 detector proposals, 48 universities, 5 labs, 303 authors, 622 pages.FY04 accelerator support requests: $772k LCRD, $380k UCLCbackground image: Big Doc author list

Proposal reviews this yearProfiles of requested funding

December, 2003 reviews of UCLC, LCRD projects:Norbert Holtkamp (ORNL) chaired the accelerator reviewHoward Gordon (BNL) chaired the detector review.Detector review procedures were adjusted so that reports from the Gordon Committee could be used by DOE to make funding decisions.DOE chose not to do this with the Holtkamp Committee. There will be another round of reviews required before funding can be provided.Will there be funding? Well see.


UCLC + LCRD FundingProfiles of requested funding

HEPAP says LC is important. DOE/NSF need to find ways to support LC work.Engagement of (university) community is essential. Support from DOE/NSF is necessary to show its really worth our time to put aside some of our other activities to do LC work

FY03 requestFY03 awardFY04 requestFY05 requestFY06 requestLCRD$575k(21 proposals)$400k(6 of 21 rejected)$772k(17 proposals)$871k(17 proposals)$713k(17 proposals)UCLC$379k(12 proposals)???$380k(12 proposals)$757k(12 proposals)$889k(12 proposals)


A survey of accelerator R&D: UCLC, LCRD, and ALCPG04background image: acoustic wave in copper simulation

Beam Dynamics and Simulation

simulation of beam dynamicsrf cavity dark current simulationdamping ring electron cloud modeldeveloping better software toolsmodeling machine reliability


ALCPG04 accelerator WG sessions


Beam simulation and general calculations(6 LCRD + UCLC projects)LCRD 2.27: Effects of Coherent Synchrotron Radiation in Linear Collider Systems (James Ellison)UCLC 2.29: Improved simulation codes and diagnostics for high-brightness electron beams (Court Bohn)UCLC 2.30: Beam simulation: main beam transport in the linacs and beam delivery systems, beam halo modeling and transport, and spin transport (Dave Rubin)UCLC 2.32: Damping ring studies for the LC (Sekazi Mtingwa)LCRD 2.33: A Compact Wakefield Measurement Facility (Young-Kee Kim)UCLC 2.34: Experimental, simulation, and design studies for linear collider damping rings (Joe Rogers)


Gabriele Bassi : A Simplified Method to Compute Single-Pass Coherent Synchrotron Radiation with Shielding (LCRD progress report) LCRD 2.27: funded FY03, $20k. Funds arrived too late to support a new student, but (analytic) calculations are ongoing. 2D spacetime Greens function; method-of-images shielding.Benchmark system: magnetic chicane for bunch compressor coming from a bunch with a linear chirp,evolving only in repsonse to fields of dipoles.next step: self-consistent of the charge distribution allowing the distribution to be affected by CSR.


Progress Report on UCLC Simulations at Cornell Presenter: David SaganUCLC 2.30: Beam simulation: main beam transport in the linacs and beam delivery systems, beam halo modeling and transport, and spin transport(Dave Rubin et al.)


Macroparticle tracking implemented- Full 6 x 6 sigma matrices- Ability to track through bendsLCavity element with wakefields implemented. XSIF (Extended Standard Input Format) parser implemented.I_Beam element implemented*Initial comparison with LIAR shows agreement.Recent ProgressBmad has been extended for LINAC simulation:Other progress:Bmad Documentation [http://www.lepp.cornell.edu/~dcs].Fortran to C structure conversion standard (Fortran2003).David Sagan


Tor Raubenheimer : Critical Issues in Beam Dynamics for the Linear Collider Sources, especially e+: target damage, yield, polarizationDamping rings: lots of accelerator physics. Large sensitivity of downstream systems to fluctuations in DR behavior.Low emittance transport: DR to IP. Both designs have ~100% dilution. IR and backgrounds: feedback, collimators and masking,Need to study details of design performanceMany tools have been developed or are under development but new tools neededGoal: DR IP DR simulation


Andy Wolski : Collective Effects in Damping Rings


John Power: Compact Wakefield Facility (LCRD 2.33 progress report)

A dedicated facility for high-resolution wakefield measurements of NLC structures. Work needed:A 20 MeV, high-brightness, Drive Beam excites wakefieldA 5 MeV Witness Beam probes the wakefieldDownstream Optics measures the witness beam deflection


Armen Apyan: Beam Simulation Efforts at Northwestern-ICAR Analytic solution techniques for various lattice studies in LC (CLIC) designmodeling techniques which hunt for solutions in parameter space can get lost; they need good starting points in order to find the right solution. There is virtue in analytic techniques.working on designs for turn around loop for CLIC.results are checked with MAD simulation


Valentin Ivanov: Dark Current Simulation for Linear Collider Structure R&DDark current simulation code includes particle tracking in E, B fieldshas modeling of thermal emission, field emission, secondary emissionfilling of realistic NLC cavities and structures are modeled. (Cool animations!)


Benchmarking Particle TrajectoriesComparing 2D and 3D models G = 50 MV/mG = 100 MV/m


Modeling Single Cell Experiment Track3P


Chart2

0

0

0.0000000006

0.000000069

0.000000114

0.0000002852

0.0000001253

0.0000001194

0.0000001094

0.0000001148

0.0000000874

0.0000000859

0.0000000953

0.0000001114

0.0000000979

0.0000000721

0.0000000545

0.0000000527

0.0000000472

0.0000000795

0.0000002044

0.000000135

0.0000000882

0.0000000912

0.000000093

0.0000001025

0.0000001061

0.0000000896

0.000000042

0.0000000382

0.0000000173

0.0000000072

0.0000000093

0.0000000076

0.0000000032

0.000000004

0.0000000047

0.0000000038

0.0000000039

0.0000000038

0.0000000018

0.0000000016

0.000000002

0.0000000009

0.0000000004

0.0000000015

0.0000000004

0.0000000005

0.0000000009

0.0000000005

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

N

X-ray Spectrum, P=25 MW

Sheet1

E, eVN (25MW)I, AE, eVN (50MW)E, eVNE, eVI,A

1.00E+040.00E+001.00E+040.00E+001.00E+040.00E+001.00E+040.00E+001.00E+040.00E+00

3.00E+042.72E-163.00E+040.00E+003.00E+046.48E-153.00E+041.95E-143.00E+040.00E+00

5.00E+045.69E-105.00E+040.00E+005.00E+045.90E-085.00E+041.39E-075.00E+040.00E+00

7.00E+046.90E-087.00E+040.00E+007.00E+044.71E-067.00E+046.79E-067.00E+040.00E+00

9.00E+041.14E-079.00E+040.00E+009.00E+041.27E-059.00E+042.08E-059.00E+040.00E+00

1.10E+052.85E-071.10E+050.00E+001.10E+052.28E-051.10E+053.26E-051.10E+050.00E+00

1.30E+051.25E-071.30E+050.00E+001.30E+054.05E-051.30E+054.52E-051.30E+050.00E+00

1.50E+051.19E-071.50E+050.00E+001.50E+057.22E-051.50E+056.78E-051.50E+050.00E+00

1.70E+051.09E-071.70E+050.00E+001.70E+059.20E-051.70E+055.26E-051.70E+050.00E+00

1.90E+051.15E-071.90E+050.00E+001.90E+059.00E-051.90E+054.56E-051.90E+050.00E+00

2.10E+058.74E-082.10E+050.00E+002.10E+058.58E-052.10E+054.17E-052.10E+050.00E+00

2.30E+058.59E-082.30E+050.00E+002.30E+055.95E-052.30E+053.90E-052.30E+050.00E+00

2.50E+059.53E-082.50E+050.00E+002.50E+056.18E-052.50E+054.51E-052.50E+050.00E+00

2.70E+051.11E-072.70E+050.00E+002.70E+055.54E-052.70E+053.68E-052.70E+050.00E+00

2.90E+059.79E-082.90E+050.00E+002.90E+054.15E-052.90E+052.98E-052.90E+050.00E+00

3.10E+057.21E-083.10E+050.00E+003.10E+052.40E-053.10E+052.70E-053.10E+050.00E+00

3.30E+055.45E-083.30E+050.00E+003.30E+051.05E-053.30E+052.50E-053.30E+050.00E+00

3.50E+055.27E-083.50E+050.00E+003.50E+051.05E-053.50E+052.56E-053.50E+050.00E+00

3.70E+054.72E-083.70E+050.00E+003.70E+051.74E-053.70E+052.46E-053.70E+050.00E+00

3.90E+057.95E-083.90E+050.00E+003.90E+051.66E-053.90E+052.32E-053.90E+050.00E+00

4.10E+052.04E-074.10E+050.00E+004.10E+051.58E-054.10E+052.63E-054.10E+050.00E+00

4.30E+051.35E-074.30E+050.00E+004.30E+051.60E-054.30E+052.40E-054.30E+050.00E+00

4.50E+058.82E-084.50E+050.00E+004.50E+051.51E-054.50E+052.39E-054.50E+050.00E+00

4.70E+059.12E-084.70E+050.00E+004.70E+051.54E-054.70E+052.10E-054.70E+050.00E+00

4.90E+059.30E-084.90E+050.00E+004.90E+051.28E-054.90E+051.38E-054.90E+050.00E+00

5.10E+051.02E-075.10E+051.72E-075.10E+051.27E-055.10E+051.23E-055.10E+055.46E-06

5.30E+051.06E-075.30E+051.94E-065.30E+051.33E-055.30E+051.08E-055.30E+053.38E-05

5.50E+058.96E-085.50E+054.07E-065.50E+051.26E-055.50E+059.72E-065.50E+051.44E-04

5.70E+054.20E-085.70E+053.59E-065.70E+051.14E-055.70E+059.93E-065.70E+053.19E-04

5.90E+053.82E-085.90E+053.14E-065.90E+051.15E-055.90E+059.02E-065.90E+052.31E-04

6.10E+051.73E-086.10E+051.96E-066.10E+059.56E-066.10E+057.82E-066.10E+051.34E-04

6.30E+057.25E-096.30E+057.53E-076.30E+058.95E-066.30E+056.92E-066.30E+051.38E-04

6.50E+059.29E-096.50E+053.79E-076.50E+057.02E-066.50E+054.62E-066.50E+051.66E-04

6.70E+057.56E-096.70E+053.10E-076.70E+057.49E-066.70E+053.44E-066.70E+052.21E-04

6.90E+053.21E-096.90E+052.36E-076.90E+057.61E-066.90E+053.15E-066.90E+051.97E-04

7.10E+054.02E-097.10E+052.05E-077.10E+055.64E-067.10E+052.84E-067.10E+051.93E-04

7.30E+054.67E-097.30E+051.64E-077.30E+053.77E-067.30E+052.42E-067.30E+051.32E-04

7.50E+053.78E-097.50E+051.70E-077.50E+053.47E-067.50E+052.10E-067.50E+051.15E-04

7.70E+053.95E-097.70E+051.88E-077.70E+053.25E-067.70E+051.96E-067.70E+051.07E-04

7.90E+053.78E-097.90E+051.71E-077.90E+052.78E-067.90E+051.88E-067.90E+058.97E-05

8.10E+051.78E-098.10E+051.47E-078.10E+052.36E-068.10E+051.70E-068.10E+055.34E-05

8.30E+051.59E-098.30E+051.06E-078.30E+052.22E-068.30E+051.38E-068.30E+052.36E-05

8.50E+051.96E-098.50E+058.32E-088.50E+052.20E-068.50E+051.18E-068.50E+051.68E-05

8.70E+059.12E-108.70E+059.19E-088.70E+052.27E-068.70E+051.08E-068.70E+051.92E-05

8.90E+054.15E-108.90E+056.45E-088.90E+051.36E-068.90E+051.12E-068.90E+052.93E-05

9.10E+051.50E-099.10E+052.51E-079.10E+051.36E-069.10E+051.23E-069.10E+052.40E-05

9.30E+054.07E-109.30E+052.63E-079.30E+051.00E-069.30E+051.05E-069.30E+052.46E-05

9.50E+054.99E-109.50E+051.64E-079.50E+057.47E-079.50E+058.72E-079.50E+052.32E-05

9.70E+059.06E-109.70E+059.95E-089.70E+056.88E-079.70E+056.41E-079.70E+052.24E-05

9.90E+054.62E-109.90E+051.57E-079.90E+056.78E-079.90E+056.64E-079.90E+052.10E-05

1.01E+069.08E-231.01E+061.31E-071.01E+061.07E-191.01E+066.86E-201.01E+061.82E-05

1.03E+061.72E-221.03E+061.49E-071.03E+061.08E-191.03E+065.60E-201.03E+061.91E-05

1.05E+061.21E-221.05E+061.59E-071.05E+061.15E-191.05E+068.74E-201.05E+061.90E-05

1.07E+067.29E-231.07E+068.54E-081.07E+061.17E-191.07E+061.29E-191.07E+061.69E-05

1.09E+066.04E-231.09E+065.64E-081.09E+061.06E-191.09E+064.69E-201.09E+061.64E-05

1.11E+061.02E-221.11E+064.40E-081.11E+061.27E-191.11E+064.76E-201.11E+061.49E-05

1.13E+069.98E-231.13E+061.40E-081.13E+069.52E-201.13E+062.54E-201.13E+061.27E-05

1.15E+064.50E-231.15E+061.21E-081.15E+066.98E-201.15E+063.48E-201.15E+061.11E-05

1.17E+069.47E-231.17E+061.07E-081.17E+068.41E-201.17E+065.70E-201.17E+069.99E-06

1.19E+069.98E-241.19E+067.57E-091.19E+066.77E-201.19E+063.44E-201.19E+061.02E-05

1.21E+067.56E-231.21E+065.08E-091.21E+065.23E-201.21E+064.00E-201.21E+061.08E-05

1.23E+061.35E-221.23E+065.28E-091.23E+063.78E-201.23E+066.43E-201.23E+065.24E-06

1.25E+068.42E-241.25E+066.36E-091.25E+065.40E-201.25E+063.87E-201.25E+065.07E-06

1.27E+065.00E-241.27E+065.22E-091.27E+063.13E-201.27E+063.97E-201.27E+064.67E-06

1.29E+061.57E-241.29E+066.88E-091.29E+064.72E-201.29E+062.91E-201.29E+064.09E-06

1.31E+064.63E-241.31E+061.41E-091.31E+065.37E-201.31E+068.95E-211.31E+063.31E-06

1.33E+062.95E-231.33E+061.72E-091.33E+067.08E-201.33E+062.06E-201.33E+063.09E-06

1.35E+061.20E-241.35E+062.51E-091.35E+065.56E-201.35E+061.68E-201.35E+063.06E-06

1.37E+061.49E-231.37E+062.72E-091.37E+062.90E-201.37E+061.52E-201.37E+062.82E-06

1.39E+066.43E-241.39E+069.99E-101.39E+063.55E-201.39E+061.96E-201.39E+062.70E-06

1.41E+068.01E-251.41E+061.67E-101.41E+063.51E-201.41E+062.79E-201.41E+061.76E-06

1.43E+064.22E-251.43E+062.06E-091.43E+063.72E-201.43E+061.88E-201.43E+061.66E-06

1.45E+064.90E-231.45E+068.44E-101.45E+062.43E-201.45E+062.14E-201.45E+061.04E-06

1.47E+067.72E-241.47E+068.35E-101.47E+061.86E-201.47E+061.54E-201.47E+069.08E-07

1.49E+062.14E-281.49E+067.68E-101.49E+067.59E-211.49E+062.29E-201.49E+061.05E-06

1.51E+061.83E-271.51E+067.13E-101.51E+061.16E-201.51E+061.20E-201.51E+066.80E-07

1.53E+063.48E-231.53E+067.60E-101.53E+065.82E-211.53E+061.53E-201.53E+066.36E-07

1.55E+061.93E-231.55E+065.85E-101.55E+069.19E-211.55E+066.59E-211.55E+066.96E-07

1.57E+061.84E-251.57E+069.75E-101.57E+069.71E-211.57E+061.43E-201.57E+067.94E-07

1.59E+065.99E-241.59E+062.74E-101.59E+069.76E-211.59E+061.03E-201.59E+066.19E-07

1.61E+064.66E-281.61E+067.76E-101.61E+067.71E-211.61E+066.91E-211.61E+066.65E-07

1.63E+061.27E-271.63E+062.16E-101.63E+066.04E-211.63E+064.25E-211.63E+068.07E-07

1.65E+062.76E-241.65E+067.67E-101.65E+065.60E-211.65E+063.55E-211.65E+065.03E-07

1.67E+061.38E-261.67E+068.57E-111.67E+063.22E-211.67E+064.72E-211.67E+064.30E-07

1.69E+064.91E-261.69E+066.01E-101.69E+062.76E-211.69E+062.46E-211.69E+065.20E-07

1.71E+062.34E-301.71E+063.90E-101.71E+062.29E-211.71E+061.09E-201.71E+064.22E-07

1.73E+063.15E-271.73E+061.47E-101.73E+062.91E-211.73E+061.19E-201.73E+062.56E-07

1.75E+068.63E-281.75E+068.62E-101.75E+062.46E-211.75E+063.84E-211.75E+062.86E-07

1.77E+061.06E-241.77E+063.32E-111.77E+062.19E-211.77E+064.29E-221.77E+062.90E-07

1.79E+063.25E-281.79E+061.36E-111.79E+062.41E-211.79E+061.56E-211.79E+061.68E-07

1.81E+064.74E-271.81E+069.57E-121.81E+069.49E-221.81E+065.54E-211.81E+063.25E-07

1.83E+061.56E-261.83E+061.26E-101.83E+061.92E-211.83E+065.58E-221.83E+064.12E-07

1.85E+063.50E-341.85E+068.68E-111.85E+061.30E-211.85E+062.17E-221.85E+064.30E-07

1.87E+062.13E-271.87E+067.43E-121.87E+061.20E-211.87E+065.10E-211.87E+062.55E-07

1.89E+061.08E-271.89E+069.32E-111.89E+061.40E-211.89E+062.22E-211.89E+061.45E-07

1.91E+062.04E-271.91E+064.25E-111.91E+061.43E-211.91E+061.09E-211.91E+062.56E-07

1.93E+062.51E-421.93E+065.26E-121.93E+061.51E-211.93E+062.89E-221.93E+062.07E-07

1.95E+060.00E+001.95E+063.06E-101.95E+064.32E-221.95E+060.00E+001.95E+062.47E-07

1.97E+061.31E-281.97E+066.98E-121.97E+062.72E-221.97E+062.48E-221.97E+061.20E-07

1.99E+069.15E-301.99E+064.12E-111.99E+067.92E-221.99E+063.73E-221.99E+068.16E-08

Sheet1

E, eV

N


Sheet2

E, eV

I, A

Particle Spectrum, P=25 MW

Sheet3

0.ns

0.2ns

E, eV

N

X-ray Spectrum, P=50MW

E, eV

N


E, eV

I, A

Particles Spectrum, P=50 MW

Chart1

0

0

0.000000059

0.0000047108

0.000012674

0.0000227605

0.0000404897

0.0000722138

0.0000920215

0.0000899902

0.000085812

0.0000595024

0.0000618352

0.000055379

0.0000414961

0.0000239881

0.000010498

0.0000105446

0.0000173626

0.0000165895

0.0000158047

0.0000160475

0.0000151121

0.0000153803

0.0000127972

0.0000127368

0.0000132993

0.0000126354

0.0000113958

0.0000114689

0.0000095598

0.0000089514

0.0000070169

0.000007488

0.00000761

0.0000056396

0.0000037685

0.0000034691

0.0000032456

0.0000027828

0.0000023643

0.0000022195

0.0000021972

0.0000022745

0.0000013575

0.0000013589

0.0000010045

0.0000007468

0.0000006877

0.0000006778

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

N


Sheet1

E, eVN (25MW)I, AE, eVN (50MW)E, eVNE, eVI,A

1.00E+040.00E+001.00E+040.00E+001.00E+040.00E+001.00E+040.00E+001.00E+040.00E+00

3.00E+042.72E-163.00E+040.00E+003.00E+046.48E-153.00E+041.95E-143.00E+040.00E+00

5.00E+045.69E-105.00E+040.00E+005.00E+045.90E-085.00E+041.39E-075.00E+040.00E+00

7.00E+046.90E-087.00E+040.00E+007.00E+044.71E-067.00E+046.79E-067.00E+040.00E+00

9.00E+041.14E-079.00E+040.00E+009.00E+041.27E-059.00E+042.08E-059.00E+040.00E+00

1.10E+052.85E-071.10E+050.00E+001.10E+052.28E-051.10E+053.26E-051.10E+050.00E+00

1.30E+051.25E-071.30E+050.00E+001.30E+054.05E-051.30E+054.52E-051.30E+050.00E+00

1.50E+051.19E-071.50E+050.00E+001.50E+057.22E-051.50E+056.78E-051.50E+050.00E+00

1.70E+051.09E-071.70E+050.00E+001.70E+059.20E-051.70E+055.26E-051.70E+050.00E+00

1.90E+051.15E-071.90E+050.00E+001.90E+059.00E-051.90E+054.56E-051.90E+050.00E+00

2.10E+058.74E-082.10E+050.00E+002.10E+058.58E-052.10E+054.17E-052.10E+050.00E+00

2.30E+058.59E-082.30E+050.00E+002.30E+055.95E-052.30E+053.90E-052.30E+050.00E+00

2.50E+059.53E-082.50E+050.00E+002.50E+056.18E-052.50E+054.51E-052.50E+050.00E+00

2.70E+051.11E-072.70E+050.00E+002.70E+055.54E-052.70E+053.68E-052.70E+050.00E+00

2.90E+059.79E-082.90E+050.00E+002.90E+054.15E-052.90E+052.98E-052.90E+050.00E+00

3.10E+057.21E-083.10E+050.00E+003.10E+052.40E-053.10E+052.70E-053.10E+050.00E+00

3.30E+055.45E-083.30E+050.00E+003.30E+051.05E-053.30E+052.50E-053.30E+050.00E+00

3.50E+055.27E-083.50E+050.00E+003.50E+051.05E-053.50E+052.56E-053.50E+050.00E+00

3.70E+054.72E-083.70E+050.00E+003.70E+051.74E-053.70E+052.46E-053.70E+050.00E+00

3.90E+057.95E-083.90E+050.00E+003.90E+051.66E-053.90E+052.32E-053.90E+050.00E+00

4.10E+052.04E-074.10E+050.00E+004.10E+051.58E-054.10E+052.63E-054.10E+050.00E+00

4.30E+051.35E-074.30E+050.00E+004.30E+051.60E-054.30E+052.40E-054.30E+050.00E+00

4.50E+058.82E-084.50E+050.00E+004.50E+051.51E-054.50E+052.39E-054.50E+050.00E+00

4.70E+059.12E-084.70E+050.00E+004.70E+051.54E-054.70E+052.10E-054.70E+050.00E+00

4.90E+059.30E-084.90E+050.00E+004.90E+051.28E-054.90E+051.38E-054.90E+050.00E+00

5.10E+051.02E-075.10E+051.72E-075.10E+051.27E-055.10E+051.23E-055.10E+055.46E-06

5.30E+051.06E-075.30E+051.94E-065.30E+051.33E-055.30E+051.08E-055.30E+053.38E-05

5.50E+058.96E-085.50E+054.07E-065.50E+051.26E-055.50E+059.72E-065.50E+051.44E-04

5.70E+054.20E-085.70E+053.59E-065.70E+051.14E-055.70E+059.93E-065.70E+053.19E-04

5.90E+053.82E-085.90E+053.14E-065.90E+051.15E-055.90E+059.02E-065.90E+052.31E-04

6.10E+051.73E-086.10E+051.96E-066.10E+059.56E-066.10E+057.82E-066.10E+051.34E-04

6.30E+057.25E-096.30E+057.53E-076.30E+058.95E-066.30E+056.92E-066.30E+051.38E-04

6.50E+059.29E-096.50E+053.79E-076.50E+057.02E-066.50E+054.62E-066.50E+051.66E-04

6.70E+057.56E-096.70E+053.10E-076.70E+057.49E-066.70E+053.44E-066.70E+052.21E-04

6.90E+053.21E-096.90E+052.36E-076.90E+057.61E-066.90E+053.15E-066.90E+051.97E-04

7.10E+054.02E-097.10E+052.05E-077.10E+055.64E-067.10E+052.84E-067.10E+051.93E-04

7.30E+054.67E-097.30E+051.64E-077.30E+053.77E-067.30E+052.42E-067.30E+051.32E-04

7.50E+053.78E-097.50E+051.70E-077.50E+053.47E-067.50E+052.10E-067.50E+051.15E-04

7.70E+053.95E-097.70E+051.88E-077.70E+053.25E-067.70E+051.96E-067.70E+051.07E-04

7.90E+053.78E-097.90E+051.71E-077.90E+052.78E-067.90E+051.88E-067.90E+058.97E-05

8.10E+051.78E-098.10E+051.47E-078.10E+052.36E-068.10E+051.70E-068.10E+055.34E-05

8.30E+051.59E-098.30E+051.06E-078.30E+052.22E-068.30E+051.38E-068.30E+052.36E-05

8.50E+051.96E-098.50E+058.32E-088.50E+052.20E-068.50E+051.18E-068.50E+051.68E-05

8.70E+059.12E-108.70E+059.19E-088.70E+052.27E-068.70E+051.08E-068.70E+051.92E-05

8.90E+054.15E-108.90E+056.45E-088.90E+051.36E-068.90E+051.12E-068.90E+052.93E-05

9.10E+051.50E-099.10E+052.51E-079.10E+051.36E-069.10E+051.23E-069.10E+052.40E-05

9.30E+054.07E-109.30E+052.63E-079.30E+051.00E-069.30E+051.05E-069.30E+052.46E-05

9.50E+054.99E-109.50E+051.64E-079.50E+057.47E-079.50E+058.72E-079.50E+052.32E-05

9.70E+059.06E-109.70E+059.95E-089.70E+056.88E-079.70E+056.41E-079.70E+052.24E-05

9.90E+054.62E-109.90E+051.57E-079.90E+056.78E-079.90E+056.64E-079.90E+052.10E-05

1.01E+069.08E-231.01E+061.31E-071.01E+061.07E-191.01E+066.86E-201.01E+061.82E-05

1.03E+061.72E-221.03E+061.49E-071.03E+061.08E-191.03E+065.60E-201.03E+061.91E-05

1.05E+061.21E-221.05E+061.59E-071.05E+061.15E-191.05E+068.74E-201.05E+061.90E-05

1.07E+067.29E-231.07E+068.54E-081.07E+061.17E-191.07E+061.29E-191.07E+061.69E-05

1.09E+066.04E-231.09E+065.64E-081.09E+061.06E-191.09E+064.69E-201.09E+061.64E-05

1.11E+061.02E-221.11E+064.40E-081.11E+061.27E-191.11E+064.76E-201.11E+061.49E-05

1.13E+069.98E-231.13E+061.40E-081.13E+069.52E-201.13E+062.54E-201.13E+061.27E-05

1.15E+064.50E-231.15E+061.21E-081.15E+066.98E-201.15E+063.48E-201.15E+061.11E-05

1.17E+069.47E-231.17E+061.07E-081.17E+068.41E-201.17E+065.70E-201.17E+069.99E-06

1.19E+069.98E-241.19E+067.57E-091.19E+066.77E-201.19E+063.44E-201.19E+061.02E-05

1.21E+067.56E-231.21E+065.08E-091.21E+065.23E-201.21E+064.00E-201.21E+061.08E-05

1.23E+061.35E-221.23E+065.28E-091.23E+063.78E-201.23E+066.43E-201.23E+065.24E-06

1.25E+068.42E-241.25E+066.36E-091.25E+065.40E-201.25E+063.87E-201.25E+065.07E-06

1.27E+065.00E-241.27E+065.22E-091.27E+063.13E-201.27E+063.97E-201.27E+064.67E-06

1.29E+061.57E-241.29E+066.88E-091.29E+064.72E-201.29E+062.91E-201.29E+064.09E-06

1.31E+064.63E-241.31E+061.41E-091.31E+065.37E-201.31E+068.95E-211.31E+063.31E-06

1.33E+062.95E-231.33E+061.72E-091.33E+067.08E-201.33E+062.06E-201.33E+063.09E-06

1.35E+061.20E-241.35E+062.51E-091.35E+065.56E-201.35E+061.68E-201.35E+063.06E-06

1.37E+061.49E-231.37E+062.72E-091.37E+062.90E-201.37E+061.52E-201.37E+062.82E-06

1.39E+066.43E-241.39E+069.99E-101.39E+063.55E-201.39E+061.96E-201.39E+062.70E-06

1.41E+068.01E-251.41E+061.67E-101.41E+063.51E-201.41E+062.79E-201.41E+061.76E-06

1.43E+064.22E-251.43E+062.06E-091.43E+063.72E-201.43E+061.88E-201.43E+061.66E-06

1.45E+064.90E-231.45E+068.44E-101.45E+062.43E-201.45E+062.14E-201.45E+061.04E-06

1.47E+067.72E-241.47E+068.35E-101.47E+061.86E-201.47E+061.54E-201.47E+069.08E-07

1.49E+062.14E-281.49E+067.68E-101.49E+067.59E-211.49E+062.29E-201.49E+061.05E-06

1.51E+061.83E-271.51E+067.13E-101.51E+061.16E-201.51E+061.20E-201.51E+066.80E-07

1.53E+063.48E-231.53E+067.60E-101.53E+065.82E-211.53E+061.53E-201.53E+066.36E-07

1.55E+061.93E-231.55E+065.85E-101.55E+069.19E-211.55E+066.59E-211.55E+066.96E-07

1.57E+061.84E-251.57E+069.75E-101.57E+069.71E-211.57E+061.43E-201.57E+067.94E-07

1.59E+065.99E-241.59E+062.74E-101.59E+069.76E-211.59E+061.03E-201.59E+066.19E-07

1.61E+064.66E-281.61E+067.76E-101.61E+067.71E-211.61E+066.91E-211.61E+066.65E-07

1.63E+061.27E-271.63E+062.16E-101.63E+066.04E-211.63E+064.25E-211.63E+068.07E-07

1.65E+062.76E-241.65E+067.67E-101.65E+065.60E-211.65E+063.55E-211.65E+065.03E-07

1.67E+061.38E-261.67E+068.57E-111.67E+063.22E-211.67E+064.72E-211.67E+064.30E-07

1.69E+064.91E-261.69E+066.01E-101.69E+062.76E-211.69E+062.46E-211.69E+065.20E-07

1.71E+062.34E-301.71E+063.90E-101.71E+062.29E-211.71E+061.09E-201.71E+064.22E-07

1.73E+063.15E-271.73E+061.47E-101.73E+062.91E-211.73E+061.19E-201.73E+062.56E-07

1.75E+068.63E-281.75E+068.62E-101.75E+062.46E-211.75E+063.84E-211.75E+062.86E-07

1.77E+061.06E-241.77E+063.32E-111.77E+062.19E-211.77E+064.29E-221.77E+062.90E-07

1.79E+063.25E-281.79E+061.36E-111.79E+062.41E-211.79E+061.56E-211.79E+061.68E-07

1.81E+064.74E-271.81E+069.57E-121.81E+069.49E-221.81E+065.54E-211.81E+063.25E-07

1.83E+061.56E-261.83E+061.26E-101.83E+061.92E-211.83E+065.58E-221.83E+064.12E-07

1.85E+063.50E-341.85E+068.68E-111.85E+061.30E-211.85E+062.17E-221.85E+064.30E-07

1.87E+062.13E-271.87E+067.43E-121.87E+061.20E-211.87E+065.10E-211.87E+062.55E-07

1.89E+061.08E-271.89E+069.32E-111.89E+061.40E-211.89E+062.22E-211.89E+061.45E-07

1.91E+062.04E-271.91E+064.25E-111.91E+061.43E-211.91E+061.09E-211.91E+062.56E-07

1.93E+062.51E-421.93E+065.26E-121.93E+061.51E-211.93E+062.89E-221.93E+062.07E-07

1.95E+060.00E+001.95E+063.06E-101.95E+064.32E-221.95E+060.00E+001.95E+062.47E-07

1.97E+061.31E-281.97E+066.98E-121.97E+062.72E-221.97E+062.48E-221.97E+061.20E-07

1.99E+069.15E-301.99E+064.12E-111.99E+067.92E-221.99E+063.73E-221.99E+068.16E-08

Sheet1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

N


Sheet2

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

I, A

Particle Spectrum, P=25 MW

Sheet3

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

00

0.ns

0.2ns

E, eV

N


0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

N


0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E, eV

I, A

Particles Spectrum, P=50 MW

Mauro Pivi : Electron Cloud in the NLC and TESLA a problem for LC damping ringsdevelopment of detailed models for electron cloud in progressinvestigation of methods to reduce secondary emission underway


Peter Tenbaum: Collimator WakefieldsBeam which passes off-axis though collimator jaws gets a transverse kickCollimator Wakefields likely to play important role in dynamics of beam delivery systemWith tail-folding octupoles, theory says present designs OKWithout tail-folding octupoles, present design is marginal to unacceptableTheoretical estimates of wake kicks not yet at acceptable level


Peter Tenenbaum, LC simulation tools


LC availability Simulation done for the LC comparison task forceTom HimelWarm DR+Linac, downtime by system

See Toms talk for the subtleties and caveats.


Damping RingsKickersPermanent Magnets


Kickers, magnets, mechanical support systems (4)LCRD 2.22: Investigation of Novel Schemes for Injection/Extraction Kickers (George Gollin)LCRD 2.23: Ring-tuned, permanent magnet-based Halbach quadrupole (James Rosenzweig)UCLC 2.25: Investigation and prototyping of fast kicker options for the TESLA damping rings (Gerry Dugan)LCRD 2.26: Continuing Research and Development of Linac and Final Doublet Girder Movers (David Warner)


Injection/extraction from trailing edge of a train (J. Rogers) Advantages: Bunches are always extracted and injected at the end of a bunch train, so the injection/extraction kickers need only have a fast rise time. The damping ring can be much smaller than the dogbone design. Positron bunch production rate is greatly reduced, allowing use of a conventional positron source.Disadvantage:An additional small ring is required.UCLC 2.34 progress: simulations, as well as CESR-c machine studies concerning damping ring issues. Some novel designs for damping rings being considered.


Injection/extraction from trailing edge of a trainSimplified timing example: 3 trains of 3 bunchesJoe Rogers


LCRD 2.22: Investigation of Novel Schemes for Injection/Extraction Kickers (George Gollin)LCRD 2.22: rejected by DOE in FY03. Were working on it anyway. We have a configuration with which unkicked bunches experience both zero pT and zero dpT/dt.

LCRD 2.23: Ring-tuned, permanent magnet-based Halbach quadrupole (James Rosenzweig)LCRD 2.23: funded FY03, $35k. Good progress, both in modeling and in fabrication of prototypes for studies.


Long Range Planning at Fermilab Fermilab is going through long range planning. There are two accelerator projects that are being considered: Proton Drive (A high intensity Proton machine at 8 GeV) Linear Collider Commitment and leadership at the highest levels of Fermilab management to establish Fermilab as the preferred host. Develop Fermilab capability to provide technical leadership on the LC construction project.Engagement in the critical accelerator technology issues and demonstration project(s). Suggest identifying a limited number (two) of areas in which to concentrate accelerator physics effort with goal of establishing leadership, e.g.Damping ringMain linacShekhar Mishra

Thoughts on the Scope of ETF It must be done with International collaboration. It should have the capability to do perform beam studies. ETF could be 1% demonstration machine for the technology chosen by ITRP. It could have an Injector, Linac (5 GeV), Damping Ring, post damping ring Linac (~0.5 GeV) It could be a development facility for the Instrumentation, controls etc needed for the LC. It could be a development facility for one of a kind device. It could be used for industrialization/ later testing of the major component.Shekhar Mishra

Systems & Instrumentationbeam position/size monitorsactive collimatorsbeam loss, rf, ground motion monitorscontrol systems


Instrumentation and electronics (9 projects)LCRD 2.1: Beam Halo Monitor & Instrumented Collimators (Lucien Cremaldi)LCRD 2.2: Beam Test Proposal of an Optical Diffraction Radiation Beam Size Monitor at the SLAC FFTB (Yasuo Fuki)LCRD 2.3: Design and Fabrication of a Radiation-Hard 500-MHz Digitizer Using Deep Submicron Technology (K. K. Gan)LCRD 2.4: RF Beam Position Monitors for Measuring Beam Position and Tilt (Yury Kolomensky)UCLC 2.5: Non-intercepting electron beam size diagnosis using diffraction radiation from a slit (Bibo Feng)UCLC 2.6: Single-shot, electro-optic measurement of a picosecond electron bunch length (Bill Gabella)UCLC 2.7: Fast Synchrotron Radiation Imaging System for Beam Size Monitoring (Jim Alexander and Jesse Ernst) LCRD 2.9: Radiation damage studies of materials and electronic devices using hadrons (David Pellett)LCRD 2.42: Transverse Phase Space Measurements for a Magnetic Bunch Compressor by Using Phase Space tomography (Feng Zhou)

LCRD 2.1: Beam Halo Monitor & Instrumented Collimators (Lucien Cremaldi)LCRD 2.1: funded FY03, $28k. Progress in seeing signals from a diamond detector. (Diamond since radiation damage will be an issue.)Other possibilities being considered: W-quartz fiber, for example.


LCRD 2.2: Beam Test Proposal of an Optical Diffraction Radiation Beam Size Monitor at the SLAC FFTB (Yasuo Fuki)

LCRD 2.2: funded FY03, $40k. Simulation work so far.ODR Yield in 0.1/g angle ranges: rms transverse beam size


LCRD 2.3: Design and Fabrication of a Radiation-Hard 500-MHz Digitizer Using Deep Submicron Technology (K. K. Gan)LCRD 2.3: funded FY03, $40k. Some of the circuit functional blocks have been designed, but none fabricated for test yet.

LCRD 2.4: RF Beam Position Monitors for Measuring Beam Position and Tilt LCRD(Yury Kolomensky)LCRD 2.4: funded FY03, $30k. Some data analysis of test beam data from KEK ATF using SLAC-built position monitor.


UCLC 2.7: Fast Synchrotron Radiation Imaging System for Beam Size Monitoring(Jim Alexander and Jesse Ernst)UCLC 2.7: exploring possible parameters, configuration. discussions only so far.

Design for a Synchrotron Radiation Camera for Beamsize Measurement

Basic concept: Refocus SR in the damping rings to make a projected image of the passing bunch.Diffraction limit on source size forces us into the x-ray regime

Goals: definite: Measure and possible: Single-bunch resolution optimistic: Intrabunch measurement (i.e. z)Don't yet know if this will be possible.Still working on ideas for this.

Status:Have started simple simulations for studying optics and detector choices:Opticspoint-to-point with sufficient magnificationZone plates are one candidateDetectionsmall pixel array is one candidate

Relevant times

tesla nlccycle 57us 743ns

interbunch 20ns 1.4ns

bunchlength 20ps 13ps

Arc dipole

monochromator

l

point-to-point optics

detector

LCRD 2.9: Radiation damage studies of materials and electronic devices using hadrons(David Pellett)LCRD 2.9: funded FY03, $20k. Neutron irradiation of permanent magnet materials is underway. Pellett gets reactor time, has student(s) helping with analysis.


LCRD 2.42: Transverse Phase Space Measurements for a Magnetic Bunch Compressor by Using Phase Space tomography(Feng Zhou)LCRD 2.42: new proposal FY04


Ground motion (1 project)

LCRD 2.11: Ground Motion studies versus depth (Mayda Velasco)Has used ICAR funds to purchase equipment, some installed.

Linear collider R&D: Preparing ground motion study in NUMI noise versus depth

Broadband Three-component Seismometers KS-2000

Portable Data Recorder DL-24

Northwestern University joined the study, is providing equipment and will participate in the study

Measurements needed to determine the best depth to locate the next linear collider

Test at Aurora Mine already done

Next Numi Tunnel This was classified as a high priority project (1.5)Szleper, Velasco, Serye

Equipment ordered by NU (will arrive ~ May 27)

Mayda Velsaco: beam loss monitors for LCSecondary emission detectors, tested at CLIC test facility at CERN.Fast, rad hard, large dynamic range.


Marc Ross: introduction to (and comments concerning) instrumentation issuesHEP must aggressively attack Controls/Instrumentation issues

Real impact (of instrumentation) is the leverage on other aspects of the design esp. high cost systems


Grahame Blair: Laser beam wire system at PETRAVertical beam size e = sqrt(m - L ) laser L = (40 10) m e = (170 23 37) m


Jeff Gronberg: Nanometer BPM movers

Uwe Happek: Bunch length interferometry

RF Technology and Structuresacoustic sensorsklystron studiesrf cavity studies2 TeV NLC


RF Technology (5)LCRD 2.15 Investigation of acoustic localization of rf cavity breakdown (George Gollin)LCRD 2.17: RF Cavity Diagnostics, Design, and Acoustic Emission Tests (Lucien Cremaldi)LCRD 2.18: Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons (Mark Hess)UCLC 2.20 Research in Superconducting Radiofrequency Systems (Hasan Padamsee)UCLC 2.21: RF Breakdown Experiments at 34 GHz (J. Hirschfeld).


LCRD 2.15: Investigation of acoustic localization of rf cavity breakdown (George Gollin)LCRD 2.15: funded FY03, $9k. Pinging copper dowels with ultrasound transducers and building models of acoustic wave propagation. Currently working at reconciling details of models and data.


LCRD 2.17: RF Cavity Diagnostics, Design, and Acoustic Emission Tests (Lucien Cremaldi)LCRD 2.17: funded FY03, $23k. Bench tests, working at understanding results.


LCRD 2.18: Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons(Mark Hess)LCRD 2.18: funded FY03, $40k. My impression is that they have made very nice progress in their modeling efforts.


UCLC 2.20 Research in Superconducting Radiofrequency Systems (Hasan Padamsee)UCLC 2.20 FY03 progress: 1) Completed one single cell niobium cavity of the improved (re-entrant) shape with Hpk/Eacc 10% less than the TESLA design. The half-cells were purified at the half-cell stage by an improved heat treatment cycle that reduces the depth of titanium diffusion. This cavity is now at KEK for electropolishing. 2) We are pursuing a less expensive method of electropolishing and have successfully electropolished a single cell 1.3 GHz cavity. We are preparing to test this.


UCLC 2.21: RF Breakdown Experiments at 34 GHz(J. Hirschfeld)UCLC 2.21 progress:High-power millimeter-wave components have been received for connecting the surface fatigue test cell to one output arm of the 34-GHz magnicon. Magnicon output power is already sufficient for initial fatigue tests, with anticipated surface temperature excursions of >500 deg C possible in localized areas within the test cell. These tests are to precede mm-wave breakdown tests, to demonstrate the magnicon's utility in powering resonant loads. Design for the support and alignment structure needed for installing the components is underway.


Chris Adolphsen: Comparison of warm and superconducting rf technology

many concerns are common to both warm and cold, e.g. klystron lifetimecryo couplers are complicated: warm on the outside, cold on the inside.


Perry Wilson: Technology of 2 TeV warm collider

Copper structures; study a possible machine with 22 km length, 1.6 TeV, L=2.4 x 1034NLCTA unloaded gradient ~ 60 MV/m in traveling wave structure. Since want ~100 MV/m, perhaps could use a standing wave structure instead. RF guns have been made with ~80 MV/m standing wave structures so this is encouraging.Klystrons will want to double the pulse width relative to NLC, and up the fficiency form 50% to 60%.only reasonable extrapolations of current NLC technology are needed to go to 2 TeV.


Beam Deliveryand Interaction Regionsoverall warm/cold differences and BDS risksjitter and stability comparisons: warm/coldnanosecond time scale feedbackinternational cooperation on BDS


Tor Raubenheimer: Warm/Cold beam delivery system differences

Beam Delivery System is very similar for warm and cold LCsFew intrinsic differences: Larger correlated energy spread in the warm for cases that matter, DE/E can be traded against luminosityLarger longitudinal phase space in cold DR makes further bunch compression difficult (not impossible!)Further bunch compression could be used to reduce disruption or increase the luminosity


Andrei Seryi: Review of Jitter stability requirements and stabilization schemes for warm/cold LC designs

Warm LC jitter requirements are more tight But based on prototype measurementsStability is provided by several systemsEach of systems allowed to work not perfectlyAccessible quads make ad-hoc fixes easyCold LC jitter requirements are less tight Stability of quads in cryomodules was not demonstrated Collision stability provided solely by intratrain feedback This single system is not allowed to failQuads hidden in cryostats make ad-hoc fixes difficult


Phil Burrows, Feedback on nanosecond timescales (FONT)


Tor Raubenheimer: Beam Delivery Risk Assessment for warm / cold LC

A number of risk issues identified in BDSCollective effectsMagnet jitter in BDSHeating of SC IR magnetsCollimator performance and MPS limitationsAberration tuning proceduresCrab cavityThe upper 3.5 items are also issues that can only really be determined late in the project cycle

Risks in the BDS are high because, although unlikely, there is significant luminosity impact and little time for remediationGiven present knowledge, the risks in warm and cold BDS are very similar

David Miller: International cooperation on Beam Delivery, Instrumentation & Backgrounds

Crossing angle or not?Lots to do, and much of it needs to be done internationally.


Sourcesundulator e+ productionpolarized e- sourceslasers


Electron and positron sources (2)LCRD 2.37: Undulator Based Production of Polarized Positrons (William Bugg)LCRD 2.40: Development of Polarized Photocathodes for the Linear Collider. (Richard Prepost)


Accelerator Physics LCRD 2.37 (funded FY03, $25k)Undulator Based Production of Polarized Positrons for Linear Colliders(SLAC Experiment E-166: presented by JC Sheppard) S. Berridge, W. Bugg, Y. Efremenko, T. Handler, Y. Kamychkov, S.Spanier, University of TennesseeC. Lu, K.T.McDonald. Princeton University E-166 uses the 50 GeV FFTB beam in conjunction with a 1 m-long, helical undulator ( = 2.4 mm, ID = 0.9 mm) to make 10-MeV polarized photons.

These photons are converted in a ~ 0.5 rad. len. Thick target into e+ (and e-) with ~ 50% polarization.

The polarization of the positrons and photons will be measured.

E-166 scheduled to run in Oct. 2004.Concept: Balakin and Mikhailichenko (1978)Hardware: Silicon calorimeters (U.Tennessee), Aerogel Cerenkov, Positron transport magnets (Princeton).


Polarization Achieved, strained GaAsSLC Pemax ~78% (at source), ~76% at Compton polarimeterJ. E. Clendenin, Polarized Electron Sources for Future Colliders: Present Status and Prospects for Improvement


Cathode

Structure

Growth

Method

Pemax

0

(nm)

QEmax(o)

Polarimeter

Ref

1a GaAsP/GaAs

strained SL

MOCVD

0.92

775

warm

0.005

Mott

Nagoya

a

1b GaAsP/GaAs

strained SL

MBE

0.86

783

warm

0.006

CTS Mott

SLAC

b

0.90

780

cold

0.008

Mller E158-III

SLAC

c

2 GaAsP/GaAs

strained-layer

MOCVD

0.82

805

warm

0.001

CTS Mott

SLAC

d

0.85

800

cold

0.004

Mller E158-I

SLAC

e

LCRD 2.40: Development of Polarized Photocathodes for the Linear Collider (Richard Prepost)LCRD 2.40: new proposal FY04, but work underway with SBIR funding. Bandgap engineering of strained GaAs.


A. Brachmann, Laser Development for NLC Related Photocathode Research General description of NLC and TESLA requirements for lasersdiscussion of Q-switched laser operation.


Y. K. Batygin, e+ Capture in Linear Colliders


End Matter


ConclusionsStatus of both warm and cold rf cavity development is very encouraging: cavities with adequate gradients can be fabricated A very large amount of detailed work (e.g. beam dynamics, emittance preservation, industrialization, design of control/instrumentation system) is still aheadThe university groups need clear indications that DOE, NSF will support their LC efforts.Theres a LOT to do.Integration of new participants (e.g. university groups) into LC is underway, but still in its early stages. This will be smoother after the technology choice is made.


accelerator physics summary & report on uclc + lcrd r&d program alcpg04 - slac george gollin

Documents