GADGET*GADGET*

- Motivation

- Work packages

Wigglers

Intra Beam Scattering

Instrumentation Test Beam

Vacuum Systems

-Budget guidelines and status

_______________________________

*Generation And Diagnostics Gear for tiny EmiTtance

ESGARD Open Meeting on FP7-IACERN, 10-11 September, 2007

NAS Integrated Activity

Hans-H. Braun, ESGARD OMNIA meeting, 10.9.2007

Generation of high brightness e- & e+ beams

Accelerate fast & efficient

Preserve brightness up to IP

Key Ingredients for Linear Collider

Generation of high brightness e- & e+ beams

Accelerate fast & efficient

Preserve brightness up to IP

Key Ingredients for Linear Collider

GADGET

3rd generation light source

Equilibriumbeam emittance

Stochastic SR emission

SR cooling from bending magnets

SR insertion devices

Intra beam scattering

Heating Cooling

LCdamping ring

Equilibriumbeam emittance

Stochastic SR emission

SR cooling from bending magnets

SR insertion devices

Intra beam scattering

e+ , small time structurevacuum system

instabilities

Linear collider damping rings are extrapolating technology of SR Light sources

Damping rings and 3rd generation SR facility parameterstable from Yannis Papaphilippou

PARAMETER ILC CLIC ATF ALS SLS

energy [GeV] 5.00 2.424 1.3 1.9 2.4

Bunch charge [109] <20 4.4 10 4 6

circumference [m] 6695.1 365.2 139 197 288

hor. normalized emittance [nm] 5600 395 2798 25656 23483

ver. normalized emittance [nm] 20 4.2 25 19 20

NBXY 105 nm2] 1.78 26.5 1.42 0.082 0.128

Key component to get high brightness are dampings ring Key component to get high brightness are dampings ring

CLIC damping ring CLIC damping ring

• Emittance IBS dominated, 4 x zero current emittance)

• Very strong damping with 2.5 T, W=5cm s.c. wiggler

• Open issues: Wiggler technology, reliability of IBS calculations, e-cloud…

M. Korostelev

SC Wiggler Workpackage

Goals

Demonstrate technical feasibility of wiggler magnets anticipated for CLIC

Explore the technical limits

Get input for LC damping ring design

SC Wiggler workpackage

Partners & Facilities

BINPSC Magnet production and measurement facilities

ANKA2.5 GeV e- storage ring with straight section dedicated for ID R&D

CERN AT-MCSSC cable characterization, coil technology

Only superconducting wiggler magnets with unprecedented parameters can provide sufficient damping strength.

BINP and ANKA have made paper studies for such wigglers,Documented in conference papers at EPAC’06 and PAC’07

Both, BINP and ANKA have an impressive record of achievements with this type of magnet technology

In GADGET we want to design & produce two full size (2m) prototypes of each wiggler type including magnet measurements and tests with beam in ANKA 2.5 GeV SR source.

Goals are

• Demonstrate feasibility of wiggler concepts

• Understand limitations and permissible parameter space for wigglers (therefore two types !)

• Get realistic wiggler description for beam dynamics

BINP ANKA

Bpeak 2.5 T 2.7 T

W 50 mm 21 mm

Beam aperture full height 12 mm 5 mm

Conductor type NbTi NbSn3

Operating temperature 4.2 K 4.2 K

Contour plot of horizontal emittance with IBS as function of wiggler parameters

ANKA SCwiggler

BINP SCwiggler

BINP PMwiggler

Sketches of BINP wiggler

Low vertical beta-optics in the long straight sections of ANKA: βx =14 m, βy = 1.9 m, εx = 40 nm

IBS Workpackage

Goals

Improve Intrabeam scattering theory for reliable predictionof beam performance in unprecedented parameter regime

Validate theory with measurements in existing SR facilities

IBS Workpackage

Partners & Facilities

Cockcroft InstituteDevelopments on IBS theory in Robin Tuckers groupWell equipped theoretical toolbox

ANKAExperiments in ANKA (commitments for beamtime linked with wiggler WP)

CERN (no requests, thesis supervision together with EPFL)

PSI (associated , no requests, thesis supervision together with EPFL)Experiments in SLS

LNF (associated, no requests)Experiments in DANE

IBS workpackage

CLIC DR’s emittance will be dominated by IBS

ILC DR’s emittance has considerable contribution from IBS

Predictive power of existing theory for this regime is more than questionable

• New approaches to compute phase space distribution

• Methods to predict halo generation due to IBS

• IBS and beam polarization

• Ad initio design of magnet lattice for minimum IBS+SR emittance

• Experimental verification of theory with experiments in existing storage rings

See slides of talks at IBS’07 workshop at Cockcroft Institute

2

Single bunch Transverse Emittance

by Laser wire

X emittance determined by Ring Design. Measured data points are fit to simulation.Y emittance =6.5pm at GLC intensity, is below GLC design.

0.8

1.0

1.2

1.4

1.6

1.8

2.0

0 2 109 4 109 6 109 8 109 1 1010

Horizontal Emittancex emittance (run B)x emittance (run D)simulation (0.4% coupling)

x e

mit

tan

ce

[1

0-9]

bunch intensity [electrons/bunch]

GLC Design

2.0

3.0

4.0

5.0

6.0

7.0

8.0

0 2 109 4 109 6 109 8 109 1 1010

Vertical Emittancey emittance (run B)y emittance (run D)simulation (0.4% coupling)

y e

mit

tan

ce

[1

0-12]

bunch intensity [electrons/bunch]

GLC Design

ATF ResultsATF Results

ITB Workpackage

Goals

Provide dedicated facility for beam instrumentation developments

Enable development of novel diagnostic techniques critical for LC’sperformance

Provide an European infrastructure for training opportunities in beam diagnostics

ITB Workpackage

Partners & Facilities

John Adams Instituteworkshops

CERNCTF3

LAPPworkshops and measurement labs

TU Berlinworkshops and measurements labs

Univ. Heidelberg

Univ. Karlsruhe (associated)

CEA-DAPNIACalifes probe beam injector in CTF3

Layout of CLEX-A Layout of CLEX-A (A=Accelerator housing)(A=Accelerator housing) floor space floor space

Dedicated beam line for beam diagnostics R&D using CALIFES beam Dedicated beam line for beam diagnostics R&D using CALIFES beam

Features: low Features: low beam, possibility to achieve very short bunch length, variable time structure, space, accessibility beam, possibility to achieve very short bunch length, variable time structure, space, accessibility

Beamline design and constructionBeamline design and construction JAI, LAPP and CERNJAI, LAPP and CERN

Diagnostics R&D in ITB requested in GADGETDiagnostics R&D in ITB requested in GADGET

Coherent diffraction radiation methodsCoherent diffraction radiation methods JAIJAI

BPM’s for integration in DR-wiggler cryostatBPM’s for integration in DR-wiggler cryostat TU Berlin and LAPPTU Berlin and LAPP

Quantitative halo monitors Quantitative halo monitors Univ. Heidelberg and KarlsruheUniv. Heidelberg and Karlsruhe

Gas jet for “calibration halo”Gas jet for “calibration halo” Univ. Heidelberg and KarlsruheUniv. Heidelberg and Karlsruhe

Single shot emittance measurementsSingle shot emittance measurements CERNCERN

42.5 m

8 m

1.4m

D FFD

DF

F

D F DDUMP

D F D

F

FD

ITB

1.85m

CALIFES probe beam injectorprovided by CEA-DAPNIA

LIL-ACSLIL-ACSLIL-ACSD F D

D F D

DFDUMP

0.75

1.4m

1

DUMP

22.4 m

TBL

2.5m

walk around zone

DUMP

DUMP 23.2 m

1.4 m

DF DF DF DF DF DF DF DF

3.0m3.0m6 m

D F D

F DF D

16.6 m

TBTS

16 m

TL2’

Instrumentation Test Beam Line , ITB in CTF3

CERN contributionions to ITB

Floor space

Technical infrastructure

Magnet and Vacuum power supplies

Control system infratructure

Cabling

LAPP BPM electronic development for CTF3

BPI

analogmodule

digitalmodule

RJ45

Acquisition(ethernet)

Design of High Dynamic Range Beam Profile MonitorsHeidelberg University

Pre studies started at CTF3 in 2003

Novel camera systems >105 dyn. range Able to define regions of interest Fast acquisition

Core masking technique / Micro Mirror Array

- Measure profile- Define halo region- Use mirrors to block (intense)

light from coreC.P. Welsch et al

Proc. SPIE Europe Optical Metrology (2007)

C.P. Welsch et alMeas. Sci. Technol. 17 (2006) 2035c

Experimental Studies on Beam Halo

Gas jet curtain

BeamBeam + Halo

Development of gas jet with highly flexible geometry (intensity and shape), Generation of desired halo distribution, Measurements with high dynamic range monitors, Goal: Benchmarking and improvement of models.

Principle:

Vacuum systems workpackage

Goals

Develop technical solutions for the vacuum system for linear collider damping rings

Get data set for coating as required for reliable prediction of damping ring performance

Vacuum systems workpackage

Partners & Facilities

LNFDANE (e+ beam for e-cloud studies !), vacuum lab.

Cockcroft InstituteVacuum lab

CERN (TS-MME & AT-VAC)Coating facilities, surface physics lab, vacuum lab

ESRFcoating facilities, vacuum lab,SR beamline for photoemission yield measurements

Vacuum systemsVacuum systems

Major worries for DR’s are instabilities due to Ions and e-cloud.Reduction of residual gas pressure and reduction of secondary emissionwith appropriate coatings (NEG, TiN,…) may cure these efffects. This requires a good understanding of a wide range of coating properties and fabrication techniques. There are potential spin-offs with other CLIC and ILCvacuum systems, but also with LHC injector chain.

• LNF Test of vacuum chamber coatings with beam in DANE ring

• Cockcroft Institute Behavior of NEG coatings under conditions close to those expected in damping rings.  Measurement of photo-electron yield, photon-stimulated desorption rates, conditioning rates, ….  Some data are already available, but need for a set of systematic and rigorous measurements to be able to design a vacuum system with confidence.

• CERN Correlate SEY with surface composition and conditioning Develop new production technique for NEG coated vacuum pipes of small diameter (few mm) Improve capability to simulate vacuum properties in long chambers pumped by NEG films

XPS chamber, 254 mm diam, 70 mm length of CF35 flange320 mm after flangeto be off of XPS table

VACUUM@CERN FOR GADGET

XPS and SEY meas. integratedCoatings and production techniques

1450 CERN made NEG-coated pipes installed in the LHC

e-cloud detectionSPS & PS dedicated benches

10-2

10-1

100

10-3 10-2 10-1 100

10

100

Glo

bal C

aptu

re P

robabili

ty

Sticking Probability

CO

pu

mpin

g sp

eed [ s -1]

M-C simulation

Our experience:- Vacuum in the largest accelerator complex- Production and characterisation facilities already available- Tests benches for ECloud studies already available (SPS & PS)- Commissioning of LHC & Injectors

Where the NEG films were born and grown

P. Chiggiato & J.M. Jimenez

Workpackage Interest Institute Activity TotalTotal /

workpackageEU /

workpackage

ANKA SC-Wiggler 2cm, test installation in ANKA 1368

BINP SC-Wiggler 5cm 800

CERN AT SC-wire and coil technology 200

CERN AB ITB CERN 370

JAI ITB John Adams 1395

LAPP BPM systems 929

JAI CDR experiment 437

Uni. Heidelberg Halo diagnostic developments 300

Uni. Karlsruhe ITB Halo Studies 0

CERN AB single shot emittance measurement 127

TU Berlin Wiggler BPM 321

PSI IBS experiments at SLS/PSI 0

LNF IBS experiments with DAFNE 0

ANKA IBS/wiggler experiment in ANKA 109

Cockcroft IBS theory 327

LNF Ecloud with NEG chamber coating studies in DAΦNE 389

Cockcroft Surface characteristion of NEG coating 1170

CERN TS&AT Small NEG coated chambers, SEY, vac. simulation 815

ESRF tbd

Grand Totals 9057 2801

Ratio commitment/EU request

SC Wiggler

IBS

CLIC

CLIC & ILC

2368

436

2374

3879

2.2

883

988

71

859

Instrumentation Test Beam

CLIC & ILC

Vacuum systems

ILC & CLIC

Present status of GADGET budget estimate all numbers in k€

Budget guidelines from ESGARD (as communicated by Erk Jensen) and present status

Target for GADGET total cost 3.0 M€ + 1.5 M€ (optional) = 4.5 M€

Target for GADGET request to EU 1.0 M€ + 0.5 M€ (optional) = 1.5 M€

Target for commitments / EU request 2.0

Present GADGET total cost 9.0 M€

Present level of EU request 2.8 M€

Present commitments / EU request 2.2

Comments 1st round of systematic accounting of indirect cost boosted EU request from ~2.1 M€ to 2.8 M€ Commitments can be booked elsewhere, but considerable fraction comes from Labs without

direct representation in ESGARD Vacuum systems activity included at request from ILC community after guideline was given Very personal opinion: By creating awareness of existing capabilities & facilities in partner labs

EU requests can probably be reduced to ~2.0-2.4 M€. Further reduction implies abandoning one of the heavy workpackages