LCLS2sc MAD files: Injector to Bypass Line lattice version 1.2 (October 30, 2013)
description
Transcript of LCLS2sc MAD files: Injector to Bypass Line lattice version 1.2 (October 30, 2013)
LCLS2sc MAD files: Injector to Bypass Linelattice version 1.2 (October 30, 2013)
M. Woodley
SXU
HXU
proposed FACET-II LCLS-ILCLS-II SC Linac
cross-overbypass linem-wall
A-line
B-lineSector-10 Sector-20 Sector-30Sector-0
extension lineL3L2L1
s (m)
• new linac beam axis defined- X= +0.28 m , Y= -0.99 m w.r.t.
original linac axis- Z= original linac Z-coordinate- Z= 0 at start of LI01- Z= -20 m at cathode
LCLS-II - Linac and Compressor Layout for 4 GeV
CM01 CM2,3 CM04 CM15 CM16 CM35BC1
E = 250 MeVR56 = -55 mmsd = 1.4 %
BC2E = 1600 MeVR56 = -60 mmsd = 0.46 %
GUN0.75 MeV
LHE = 95 MeV
R56 = -14.5 mmsd = 0.05 %
L0j = *
V0 =94 MVIpk = 12 A
Lb = 2.0 mm
L1j =-21°
V0 =223 MVIpk = 12 A
Lb =2.0 mm
HLj =-165°
V0 =55 MV
L2j = -21°
V0 =1447 MVIpk = 50 A
Lb = 0.56 mm
L3j = 0
V0 =2409 MVIpk = 1.0 kA
Lb = 0.024 mm
LTUE = 4.0 GeV
R56 = 0sd 0.016%
2-km
100-pC machine layout: Oct. 8, 2013; v21 ASTRA run; Bunch length Lb is FWHM
3.9GHz
LinacSec.
V(MV)
j(deg)
Acc. Grad.
(MV/m)
No. Cryo Mod’s
No. Avail.Cav’s
Spare Cav’s
Cavities per
Amplifier
L0 94 * 13.2 1 8 1 1
L1 220 -21 14.3 2 16 1 1
HL -55 -165 14.5 3 12 1 12
L2 1447 -21 15.5 12 96 6 48
L3 2409 0 15.4 20 160 10 48
* L0 cav. phases: ~(3.4, -15.2, 0, 0, 0, 15, 15), with cav-2 at 22% of other L0 cavity gradients.
Includes 2-km RW-wake
• Egun = 750 KeV• Einj = 98 MeV• L0 :
- 8 cavity cryomodule (layout courtesy XFEL Mad deck)- gradients and phases per P. Emma layout (version of October 8, 2013)
• initial Twiss are “artificial”• final Twiss from C. Papadopoulos ("GUN2013_10_08v3“)
750 KeV
98 MeV
β = 7.5435 mα = -0.2173
Gun + L0
Matching + Laser Heater + L1
98 MeV
250 MeV
• Einj = 98 MeV• EBC1 = 250 MeV• 6 quadrupole matching section between L0 and Laser Heater• Laser Heater chicane:
- lengthened version of LCLS system (L= 3.529 m)- ηmax= 7.5 cm, R56= 14.5 mm- βX = βY = 10 m (α = 0) at center of chicane- includes momentum collimator
• space for kicker (L= 2 m) and long drift (L= 8 m) provided for extraction to diagnostic line• L1 :
- 2 x 8 cavity cryomodules (layout courtesy XFEL Mad deck) … φ= -22°- 3 x 4 cavity harmonic linearizer cryomodules (3.9 GHz) … φ= -165°- 90° FODO lattice
BC1 + Betatron Collimation
• EBC1 = 250 MeV• BC1 chicane :
- copy of LCLS system- R56= 55 mm- small βX at fourth bend (CSR)
• space for kicker (L= 2 m) and long drift (≈ 15 m total) provided for extraction to diagnostic line• betatron collimation system :
- 2 x 90 ° FODO cells (Lcell ≈ 16 m)- β = 25 m at collimators (2 x horizontal collimation + 2 x vertical collimation)
L2
250 MeV
1.6 GeV
• EBC1 = 250 MeV• EBC2 = 1.6 GeV• L2 :
- 12 x 8 cavity cryomodules (layout courtesy XFEL Mad deck) … φ= -21°- 30° FODO lattice
BC2 + Betatron Collimation
• EBC2 = 1.6 GeV• BC2 chicane :
- copy of LCLS system- R56= 60 mm- small βX at fourth bend (CSR)
• space for kicker (L= 2.5 m) and long drift (≈ 30 m total) provided for extraction to diagnostic line• betatron collimation system :
- 2 x 90 ° FODO cells (Lcell ≈ 24 m)- β = 38.4 m at collimators (2 x horizontal collimation + 2 x vertical collimation)
L3 + Extension to LI10
1.6 GeV
4.0 GeV
• EBC2 = 1.6 GeV• Efinal = 4.0 GeV• L3 :
- 20 x 8 cavity cryomodules (layout courtesy XFEL Mad deck) … φ= 0- 15° FODO lattice
• L3 extension :- 4 x 90° FODO cells (Lcell= 45 m)
• at start of Bypass Dogleg, Z= 936.872 m (≈ 22.5 m into LI10)
Bypass Dogleg + Match to Bypass Line FODO
• Efinal = 4.0 GeV• dogleg bending system :
- from X/Y = +0.28/-0.99 m to X/Y = -0.650494/+0.649478 m (ΔX/ΔY = -0.37/+1.64 m)- two 1.06° bends, rolled to 60.4°- 4 x 90° FODO cells (Lcell= 25.4) cancel dispersion in both planes- momentum collimator and wire scanner included- total Z-length = 102.5 m
• update compression parameters to latest version of P. Emma layout• use M. Venturini’s laser heater undulator parameters• exchange X and Y collimators in HXR diagnostics section• upload files to SharePoint site
- MAD8 input files- MAD8 output files- ELEGANT input files• generate upload files for Oracle Database
To Do for “Baseline” release
To Do after “Baseline” release
• reduce chromaticity of initial matching section (L0 to LH) and other sections identified by Paul
• design extraction systems and diagnostic lines (LH, BC1, BC2)• more relaxed β-functions in L2 and L3 (FFODDO rather than FODO?)• add correctors, BPMs, and other diagnostics• more …
https://portal.slac.stanford.edu/sites/lcls_public/lcls_ii/beamline_optics/wiki_lib/Home.aspx