Modeling the Upper, Middle, & Lower NF linac in G4beamline Kevin B. Beard, Muons,Inc. & Alex Bogacz, Jefferson Lab LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

Linear Pre-accelerator – 244 MeV to 909 MeV 6 short cryos 15 MV/m 8 medium cryos 17 MV/m 11 long cryos 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 pz/mc= 150 mm 8m 3m 5m Mini-workshop on Low Energy Muon Acceleration, CNU, February 2-5 , 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) http://g4beamline.muonsinc.com LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

Field maps single RF cell solenoid Ez Bz double RF cell Ez Bx,By no B yet LEMC2009 workshop 8-12 Jun 2009 Muons, Inc. MAG, Aug 31, 2010

... txt2blfieldmap LEMC2009 workshop 8-12 Jun 2009 Muons, Inc. MAG, Jun 14, 2010

g4beamline 2.02 valve assembly conductor RF cell counterwound solenoid & flux return shield RF cell LEMC2009 workshop 8-12 Jun 2009 Muons, Inc. MAG, Aug 10, 2010

LEMC2009 workshop 8-12 Jun 2009 Aug 31, 2010 Muons, Inc.

G4beamline input file z18.in ... # The "default" physics list is QGSP_BERT physics QGSP_BERT disable=Decay ###################### begin: common info ################################# # physical constants: param deg=3.14159/180. param muonmass=105.658 param c_mm_nS=299.792 upperCryomodule $Zcryo1 $j1 $Toff1 $kill1 upperCryomodule $Zcryo2 $j2 $Toff2 $kill2 upperCryomodule $Zcryo3 $j3 $Toff3 $kill3 upperCryomodule $Zcryo4 $j4 $Toff4 $kill4 upperCryomodule $Zcryo5 $j5 $Toff5 $kill5 upperCryomodule $Zcryo6 $j6 $Toff6 $kill6 middleCryomodule $Zcryo7 $j7 $Toff7 $kill7 middleCryomodule $Zcryo8 $j8 $Toff8 $kill8 middleCryomodule $Zcryo9 $j9 $Toff9 $kill9 middleCryomodule $Zcryo10 $j10 $Toff10 $kill10 middleCryomodule $Zcryo11 $j11 $Toff11 $kill11 middleCryomodule $Zcryo12 $j12 $Toff12 $kill12 middleCryomodule $Zcryo13 $j13 $Toff13 $kill13 middleCryomodule $Zcryo14 $j14 $Toff14 $kill14 lowerCryomodule $Zcryo15 $j15 $Toff15a $Toff15b $kill15 lowerCryomodule $Zcryo16 $j16 $Toff16a $Toff16b $kill16 lowerCryomodule $Zcryo17 $j17 $Toff17a $Toff17b $kill17 lowerCryomodule $Zcryo18 $j18 $Toff18a $Toff18b $kill18 lowerCryomodule $Zcryo19 $j19 $Toff19a $Toff19b $kill19 lowerCryomodule $Zcryo20 $j20 $Toff20a $Toff20b $kill20 lowerCryomodule $Zcryo21 $j21 $Toff21a $Toff21b $kill21 solenoid RF timing center Only 534 non-comment lines, produces 244 virtual detectors, 25 cryomodules beam stop LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

How G4beamline defines 0∘ LEMC2009 workshop 8-12 Jun 2009 Vary RF phases Ez Ez 0∘ Ez 90∘ 180∘ How G4beamline defines 0∘ LEMC2009 workshop 8-12 Jun 2009 Muons, Inc. MAG, Sep 14, 2010

Simple Phasing via spreadsheet 0ₒ≡on crest L=2λ c=λf z=cβt Ez(z,t) ≈ qEzo cos(2πf t + φ) cos(π z/L) +L/2 ΔE ≈ ∫ Ez(z,z/cβ) dz -L/2 ΔE ≈ -2qEzo L cos(π/ 2β) cos(φ) β2/(π (1-β2) ΔE ≈ -2qEzo L cos(π/ 2β) cos(φ) β2/(π (1-β2) Ti ≈ Ti-1+ (zi - zi-1)/(cβi-1) LEMC2009 workshop 8-12 Jun 2009 Aug 31, 2010 Muons, Inc. Muons, Inc. ΔE ≈ ∫ Ez(z,z/cβ) dz Ez(z,t) ≈ qEzo cos(2πf t + φ) cos(π z/L) Ti ≈ Ti-1+ (zi - zi-1)/(cβi-1)

1 line fix to BLCMDfieldmap.cc (ought to be in 2.04b) G4beamline 2.03 – minor bug xcmd: help fieldmap fieldmap implements a field map, E and/or B, from a file. Reads an input file in BLFieldMap format to define E and/or B fields, optionally with time dependence. See the Users Guide for a description of the BLFieldMap format. Named Arguments (#=cannot be changed in place cmd)(@=Tunable): filename Filename for the Field Map. # file Synonym for filename. # current Current of the B-field. @ gradient Gradient of the E-field. @ timeOffset Time offset (ns). didn't work properly 1 line fix to BLCMDfieldmap.cc (ought to be in 2.04b) local[3]-= timeOffset; /* KBB 25aug10 - shift time back by timeOffset */ LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

Ez Ez LEMC2009 workshop 8-12 Jun 2009 Aug 31, 2010 Muons, Inc.

phases partially adjusted phases from spreadsheet LEMC2009 workshop 8-12 Jun 2009 Aug 31, 2010 Muons, Inc.

retrack 1.17 LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

IPAC2010 ∆E~10MeV/cell Pz0=220MeV/c transit=0.716 LEMC2009 workshop 8-12 Jun 2009 Muons, Inc. MAG, Jun 14, 2010

Comparison of GPT, OptiM, g4beamline KE[MeV] z[cm] G4beamline w/adj. φ's OptiM G4beamline w/OptiM's φ's KE[MeV] LEMC2009 workshop 8-12 Jun 2009 z[cm] Muons, Inc. MAG, Jun 14, 2010

Every 3rd solenoid (adjusted from oncrest) 800 ET [MeV] 22nS t[nS] LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

GPT G4beamline y[m] LEMC2009 workshop 8-12 Jun 2009 z[m] z[m] Sep 14, 2010 Muons, Inc.

Optimizing with kmimf + G4beamline [Pz * Nm] cycle (G4beamline run#) Sep 14, 2010 Muons, Inc.

LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

Partially optimized ~ ½ lost LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

lost LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

those that made it to the end in G4beamline input t,Pz for acceptance OptiM generated input LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

Fine tuning is still in progress Synchrotron motion Pz ~ oncrest ~ 1 synch period LEMC2009 workshop 8-12 Jun 2009 t t Sep 14, 2010 Muons, Inc. 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

∘RF ~ oncrest ~ 1 synch period #m LEMC2009 workshop 8-12 Jun 2009 z[m] Sep 14, 2010 z[m] Muons, Inc.

LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

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 LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.

LEMC2009 workshop 8-12 Jun 2009 Sep 14, 2010 Muons, Inc.