Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Alex Bogacz, Vasiliy Morozov, Yves Roblin, Jefferson Lab
Kevin Beard, Muons Inc.
Morteza Aslaninejad, Cristian Bontoiu, Jürgen Pozimski Imperial College
Progress on the Linac and RLAs
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
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
EUROnu Jan. 2011
1st part of this talk
2nd part of this talk
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
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)
EUROnu Jan. 2011
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Muon Acceleration Mini-workshop
http://casa.jlab.org/external/2010/MuonAcceleration_MiniWorkshop/
Feb 2-5, 2010
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Solenoid Linac (244 -909 MeV)
EUROnu Jan. 2011
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
Muons, Inc.
Linac – tracking studies
EUROnu Jan. 2011
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
Muons, Inc.
Solenoid Model (Superfish)
EUROnu Jan. 2011
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
Muons, Inc.
Two-cell cavity (201 MHz) – COMSOL
Morteza Aslaninejad
Cristian Bontoiu
Jürgen Pozimski
EUROnu Jan. 2011
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
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
,
EUROnu Jan. 2011
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
EUROnu Jan. 2011
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
Muons, Inc.
Linac Optics – OptiM vs ELEGANT
a = 19.5 cm
a = 19.5 cm
Yves Roblin
EUROnu Jan. 2011
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
Muons, Inc.
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
EUROnu Jan. 2011
Yves Roblin
Alex Bogacz
MATHCAD
MATLAB
Morteza Aslaninejad
Kevin Beard
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Cooling Channel – Linac Optics
EUROnu Jan. 2011
B||
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
GPT Particle Tracking in the Linac
EUROnu Jan. 2011
upper middle linaccooling upper linac
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
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
EUROnu Jan. 2011
TO DO NEXT:
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
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
EUROnu Jan. 2011
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
Muons, Inc.
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
EUROnu Jan. 2011
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
Muons, Inc.
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
EUROnu Jan. 2011
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
Muons, Inc.
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
EUROnu Jan. 2011
Operated by JSA for the U.S. Department of Energy
Muons, Inc.IDS-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
EUROnu Jan. 2011
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Proposed SDDS Exchange Format
EUROnu Jan. 2011
•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
Muons, Inc.
Summary
EUROnu Jan. 2011
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?
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Recent Progresson the Linac and RLAs
Kevin B. Beard,Muons,Inc.
&Alex Bogacz, V.Morozov, Y.Roblin
Jefferson Lab
LEMC2009 workshop 8-12 Jun 2009
Recent Progress
on the Linac and RLAs
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Recent Progress
on the Linac and RLAs
0.6 GeV/pass
3.6 GeV
0.9 GeV
244 MeV
146 m
79 m
2 GeV/pass
264 m
12.6 GeV
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Mini-workshop on Low Energy Muon Acceleration, CNU, February 2-5 , 2010
Linear Pre-accelerator – 244 MeV to 909 MeV
Transverse acceptance (normalized): (2.5)2= 30 mm rad
Longitudinal acceptance: (2.5)2 pz/mc= 150 mm
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
1460
Sat Dec 13 22:36:02 2008 OptiM - MAIN: - D:\IDS\PreLinac\Sol\Linac_sol.opt
12
0
50
BE
TA
_X
&Y
[m]
DIS
P_
X&
Y[m
]
BETA_X BETA_Y DISP_X DISP_Y
5m3m 8m
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
Why another simulation?• OptiM – fast, interactive, design, matrix based 0th order design tool, symplectic soft edge solenoids, very good at tuning (free)
• GPT – good at tracking ($)
• G4beamline – tracking, Geant4 particle decays & interactions, energy depositions, showers, etc., not so good at tuning (free & open source) (v2.06)
•http://g4beamline.muonsinc.com
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Aug 31, 2010
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
G4beamline input file z18.in...# The "default" physics list is QGSP_BERTphysics QGSP_BERT disable=Decay
###################### begin: common info #################################
# physical constants:param deg=3.14159/180.param muonmass=105.658param c_mm_nS=299.792...upperCryomodule $Zcryo1 $j1 $Toff1 $kill1upperCryomodule $Zcryo2 $j2 $Toff2 $kill2upperCryomodule $Zcryo3 $j3 $Toff3 $kill3upperCryomodule $Zcryo4 $j4 $Toff4 $kill4upperCryomodule $Zcryo5 $j5 $Toff5 $kill5upperCryomodule $Zcryo6 $j6 $Toff6 $kill6
middleCryomodule $Zcryo7 $j7 $Toff7 $kill7middleCryomodule $Zcryo8 $j8 $Toff8 $kill8middleCryomodule $Zcryo9 $j9 $Toff9 $kill9middleCryomodule $Zcryo10 $j10 $Toff10 $kill10middleCryomodule $Zcryo11 $j11 $Toff11 $kill11middleCryomodule $Zcryo12 $j12 $Toff12 $kill12middleCryomodule $Zcryo13 $j13 $Toff13 $kill13middleCryomodule $Zcryo14 $j14 $Toff14 $kill14
lowerCryomodule $Zcryo15 $j15 $Toff15a $Toff15b $kill15lowerCryomodule $Zcryo16 $j16 $Toff16a $Toff16b $kill16lowerCryomodule $Zcryo17 $j17 $Toff17a $Toff17b $kill17lowerCryomodule $Zcryo18 $j18 $Toff18a $Toff18b $kill18lowerCryomodule $Zcryo19 $j19 $Toff19a $Toff19b $kill19lowerCryomodule $Zcryo20 $j20 $Toff20a $Toff20b $kill20lowerCryomodule $Zcryo21 $j21 $Toff21a $Toff21b $kill21...
Only 534 non-comment lines, produces 244 virtual detectors, 25 cryomodules
center solenoid RF timing
beam stop
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
Conclusions
• G4beamline model is working well and in general agreement with other simulations
• Essential step toward our long term goal of complete end-to-end simulations
• Fine tuning is still in progress
• Will soon begin particle interactions with the hardware
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Aug 31, 2010
Ez
Ez
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Aug 31, 2010
phases from spreadsheet
phases partially adjusted
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
MAG, Jun 14, 2010
Comparison of GPT, OptiM, g4beamline
z[cm]
KE[MeV]
KE[MeV]
z[cm]
OptiM
G4beamline w/adj. φ's
G4beamlinew/OptiM's φ's
GPT
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
ET [MeV]
t[nS]22nS
800
0
Every 3rd solenoid (adjusted from oncrest)
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
GPT
G4beamline
z[m]
z[m]
y[m]
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
lost
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
OptiM generated input
input t,Pz for acceptance
those that made it to the end inG4beamline
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
~ oncrest
~ 1 synch period
Pz
t
Synchrotron motion
t
Operated by JSA for the U.S. Department of Energy
Muons, Inc.Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009
Sep 14, 2010
~ 1 synch period
~ oncrest
#m
∘RF
z[m]
Operated by JSA for the U.S. Department of Energy
Muons, Inc.
LEMC2009 workshop 8-12 Jun 2009