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Modeling the Upper, Middle, & Lower

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Presentation on theme: "Modeling the Upper, Middle, & Lower"— Presentation transcript:

1 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.

2 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

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

4 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

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

6 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

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

8 G4beamline input file z18.in
... # The "default" physics list is QGSP_BERT physics QGSP_BERT disable=Decay ###################### begin: common info ################################# # physical constants: param deg= /180. param muonmass= param c_mm_nS= 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.

9 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

10 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)

11 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 filename Filename for the Field Map. # file Synonym for filename. # current Current of the gradient Gradient of the 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.

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

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

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

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

16 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

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

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

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

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

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

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

23 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.

24 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

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

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

27 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.

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

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

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