alex bogacz, yves roblin, jefferson lab kevin beard, muons inc
DESCRIPTION
Status of Linac and RLAs – Simulations. Alex Bogacz, Yves Roblin, Jefferson Lab Kevin Beard, Muons Inc. Morteza Aslaninejad, Cristian Bontoiu, J ü rgen Pozimski Imperial College Vasiliy Morozov, Old Dominion University. 0.9 GeV. 244 MeV. 146 m. 79 m. 0.6 GeV/pass. 3.6 GeV. 264 m. - PowerPoint PPT PresentationTRANSCRIPT
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 1
Alex Bogacz, Yves Roblin, Jefferson Lab
Kevin Beard, Muons Inc.
Morteza Aslaninejad, Cristian Bontoiu, Jürgen Pozimski Imperial College
Vasiliy Morozov, Old Dominion University
Status of Linac and RLAs –
Simulations
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 2
Linac and RLAs – ‘Big picture’
0.6 GeV/pass3.6 GeV
0.9 GeV244 MeV
146 m
79 m
2 GeV/pass
264 m
12.6 GeV
IDS Goals:
Define beamlines/lattices for all components
Resolve physical interferences, beamline crossings etc
Error sensitivity analysis
End-to-end simulation (machine acceptance)
Component count and costing
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
1st part of this talk
2nd part of this talk
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 3
RLA Lattice Studies Status
Presently completed lattices
Linear pre-accelerator – solenoid focusing
4.5 pass Dogbone RLA × 2 (RLA I + RLA II)
Optimized multi-pass linac optics (bisected - quad profile along the linac)
Droplet return arcs (4) matched to the linacs
Transfer lines between the components – injection chicanes
Droplet arcs crossing – Double achromat Optics design
Chromatic corrections with sextupoles at Spr/Rec junctions
Error analysis for the Arc lattices (proof-or-principle)
Magnet misalignment tolerance – DIMAD Monte Carlo Simulation
Focusing errors tolerance – betatron mismatch sensitivity
Piece-wise end-to-end simulation with OptiM (pre-accelerator + RLA I)
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 4
Muon Acceleration Mini-workshop
http://casa.jlab.org/external/2010/MuonAcceleration_MiniWorkshop/
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Feb 2-5, 2010
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 5
Solenoid Linac (244 -909 MeV)
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
6 short cryos
15 MV/m
8 medium cryos
17 MV/m
11 long cryos
17 MV/m
1.1 Tesla solenoid 1.4 Tesla solenoid 2.4 Tesla solenoid
Transverse acceptance (normalized): (2.5)2= 30 mm rad
Longitudinal acceptance: (2.5)2 pz/mc= 150 mm
1460
Sat Dec 13 22:36:02 2008 OptiM - MAIN: - D:\IDS\PreLinac\Sol\Linac_sol.opt
120
50
BE
TA
_X&
Y[m
]
DIS
P_X
&Y
[m]
BETA_X BETA_Y DISP_X DISP_Y
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 6
Linac – tracking studies
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
DONE SO FAR:
shielded two-shell solenoid modeled with POISSON
RF cavities modeled with SUPERFISH, COMSOL, & CST
front-to-end lattice for OptiM (solenoids, dipoles, quadrupoles, & sextupoles)
linac lattice tested in MAD-X
beam tracking using GPT
optical match of linac to cooling channel with one solenoid
beam-loading effects evaluated as negligible
standard for exchanging data files proposed
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 7
Solenoid Model (Superfish)
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
outer coil
inner coil
shield
2e
pc
22 2
edge z 0
-
1 k a= B (s) ds B L
2 8
e
pc 0k = B
‘Soft-edge’ Solenoid
21Ls
a
z 0
1B (s) = B tanh
2
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 8
Two-cell cavity (201 MHz) – COMSOL
Morteza Aslaninejad
Cristian Bontoiu
Jürgen Pozimski
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 9
Linac-RLA Acceptance Initial phase-space after the cooling channel at 220
MeV/c ISS/IDS rms
A = (2.5)2
normalized emittance: x/y mmrad 4.8 30
longitudinal emittance: l
lp z/mc)
momentum spread: p/p
bunch length: z
mm
mm
24
0.07
165
150
0.17
412
x,y = 2.74 m
x,y = -0.356
= 2.08
20-20 X [cm] View at the lattice beginning
80
-80
X`[
mra
d]
40-40 S [cm] View at the lattice beginning
18
0-1
80
dP
/P *
10
00
,
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 10NFMCC Collaboration Meeting, Oxford, MS, January 14, 2010
Transverse acceptance (normalized): (2.5)2= 30 mm rad
Longitudinal acceptance: (2.5)2 pz/mc= 150 mm
Linac Optics – Beam envelopes
1460
Thu Apr 08 13:54:52 2010 OptiM - MAIN: - C:\Working\IDS\PreLinac\Linac_sol.opt
300
300
Siz
e_X
[cm
]
Siz
e_Y
[cm
]
Ax_bet Ay_bet Ax_disp Ay_disp
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 11
Linac Optics – OptiM vs ELEGANT
a = 19.5 cm
a = 19.5 cm
Yves Roblin
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
1460
Sat Dec 13 22:36:02 2008 OptiM - MAIN: - D:\IDS\PreLinac\Sol\Linac_sol.opt
120
50
BE
TA
_X&
Y[m
]
DIS
P_X
&Y
[m]
BETA_X BETA_Y DISP_X DISP_Y
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 12
30-30 S [cm] View at the lattice end
15
0-1
50
dP
/P *
10
00
,
30-30 S [cm] View at the lattice beginning
15
0-1
50
dP
/P *
10
00
,Longitudinal phase-space
tracking
Initial distribution
OptiM
ELEGANT
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Yves Roblin
Alex Bogacz
MATHCAD
MATLAB
Morteza Aslaninejad
Kevin Beard
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 13
Cooling Channel – Linac Optics
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
B||
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 14
GPT Particle Tracking in the Linac
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
upper middle linaccooling upper linac
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 15
Include cavity filling effect on accelaration
Get a more accurate initial distribution
Design an improved cooling-to-linac section
Upgrade analytic cavity phasing – check against GPT
Complete linac lattice via tuning solenoids, phasing
cavities, & tracking with GPT
Linac and RLAs - ‘field map’ tracking
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
TO DO NEXT:
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 16
Linac-to-Arc – Chromatic Compensation
E =1.8 GeV
‘Matching quads’ are invoked
No 900 phase adv/cell maintained across the ‘junction’
Chromatic corrections needed – two pairs of sextupoles
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
36.91030
Wed Jun 11 13:14:37 2008 OptiM - MAIN: - D:\IDS\Linacs_short\Linac1_fudg.opt
15
0
3-3
BE
TA
_X&
Y[m
]
DIS
P_
X&
Y[m
]
BETA_X BETA_Y DISP_X DISP_Y 720
Wed Jun 11 14:08:34 2008 OptiM - MAIN: - D:\IDS\Arcs\Arc2_match.opt
15
0
3-3
BE
TA
_X&
Y[m
]
DIS
P_
X&
Y[m
]
BETA_X BETA_Y DISP_X DISP_Y
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 17
Linac-to-Arc Chromatic Corrections
30-30 X [cm] View at the lattice beginning
80
-80
X`[
mra
d]
30-30 X [cm] View at the lattice end
80
-80
X`[
mra
d]
30-30 X [cm] View at the lattice end
80
-80
X`[
mra
d]
initial uncorrected two families of sextupoles
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
36.91030
Wed Jun 11 13:14:37 2008 OptiM - MAIN: - D:\IDS\Linacs_short\Linac1_fudg.opt
15
0
3-3
BE
TA
_X
&Y
[m]
DIS
P_
X&
Y[m
]
BETA_X BETA_Y DISP_X DISP_Y 720
Wed Jun 11 14:08:34 2008 OptiM - MAIN: - D:\IDS\Arcs\Arc2_match.opt
15
0
3-3
BE
TA
_X
&Y
[m]
DIS
P_
X&
Y[m
]
BETA_X BETA_Y DISP_X DISP_Y
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 18
10 cells in2 cells out
2 cells out
footprint
-5000
-4000
-3000
-2000
-1000
0
1000
2000
3000
4000
5000
0 2000 4000 6000 8000 10000
z [cm]
x [cm]
(out = in and out = -in , matched to the linacs)
transition
transition
E =1.2 GeV
40-40 S [cm] View at the lattice end
30
0-3
00
dP
/P *
10
00
,
40-40 S [cm] View at the lattice beginning
300
-300
dP/P
* 1
000,
Mirror-symmetric ‘Droplet’ Arc – Optics
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
1300
Tue Jun 10 21:14:41 2008 OptiM - MAIN: - D:\IDS\Arcs\Arc1.opt
150
3-3
BE
TA
_X&
Y[m
]
DIS
P_X
&Y
[m]
BETA_X BETA_Y DISP_X DISP_Y
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 19
Multi-pass FFAG Arc
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
2 or more passes through the same arc e.g. 5 GeV and 9 GeV
NS-FFAG arc lattice design
Achromatic basic cell with 90 horizontal phase advance
Automatic matching between inward and outward bending cells
Linear optics understood
Need to incorporate sextupole and higher-order field components to accommodate higher momenta
Basic cell
example trajectories
dispersion
COSY Infinity
Vasiliy Morozov
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 20IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
60
300
simple closing of geometrywhen using similar cells
Multi-pass FFAG Arc
r = 38.5 meters
C = 302 meters
Vasiliy Morozov
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 21
Proposed SDDS Exchange Format
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
•ZGOUBI•ELEGANT•G4beamline•ICOOL•OptiM•COSY-Infinity•MAD-X•GPT•…
http://casa.jlab.org/external/2010/MuonAcceleration_MiniWorkshop/SDDS/draft.html
Kevin Beard
Operated by JSA for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
Alex Bogacz 22
Summary
IDS-NF 5-th Plenary Mtg. Fermilab, April 9, 2010
Critical components of front-end linac modeled
Initial design of the front-end linac simulated
Design matching sections simulated
RLA arc lattice + chromaticity compensation simulated
Putting the pieces together for end-to-end simulations
Multi-pass (2) FFAG Arcs?