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Pre- Linac simulations in G4beamline Kevin B. Beard Muons,Inc . & Alex Bogacz & Yves Roblin Jefferson Lab

Pre- Linac simulations in G4beamline Kevin B. Beard Muons,Inc . & Alex Bogacz & Yves Roblin Jefferson Lab. LEMC2009 workshop 8-12 Jun 2009. pre-accelerator linac - not very relativistic. Morteza Aslaninejad , Cristian Bontoiu J ü rgen Pozimski , Ajit Kurup

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Pre- Linac simulations in G4beamline Kevin B. Beard Muons,Inc . & Alex Bogacz & Yves Roblin Jefferson Lab

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  1. Pre-Linac simulations in G4beamline Kevin B. Beard Muons,Inc. & Alex Bogacz & Yves Roblin Jefferson Lab LEMC2009 workshop 8-12 Jun 2009

  2. pre-accelerator linac - not very relativistic MortezaAslaninejad, CristianBontoiu JürgenPozimski, AjitKurup Imperial College, London, UK 0.9 GeV 244 MeV 146 m 79 m 0.6 GeV/pass 3.6 GeV 264 m 12.6 GeV 2 GeV/pass Mm = 105.658 MeV Etotal: 244 MeV → 900 MeV P: 220 MeV/c → 894 MeV/c KE: 138 MeV → 794 MeV

  3. Longitudinal phase-space tracking OptiM (Matrix) ELEGANT (Fieldmap)

  4. Solenoid Linac (244 -909 MeV) Sat Dec 13 22:36:02 2008 OptiM - MAIN: - D:\IDS\PreLinac\Sol\Linac_sol.opt 5 12 BETA_X&Y[m] DISP_X&Y[m] Transverse acceptance (normalized): (2.5)2eN = 30 mm rad Longitudinal acceptance: (2.5)2 sDpsz/mmc= 150 mm 0 0 0 BETA_X BETA_Y DISP_X DISP_Y 146 8 medium cryos 17 MV/m 6 short cryos 15 MV/m 11 long cryos 17 MV/m 2.4 Tesla solenoid 1.4 Tesla solenoid 1.1 Tesla solenoid

  5. 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

  6. Solenoid Model (Superfish) outer coil shield inner coil ‘Soft-edge’ Solenoid

  7. Two-cell cavity (201 MHz) – COMSOL MortezaAslaninejad CristianBontoiu JürgenPozimski

  8. Field maps solenoid Bz single RF cell Ez double RF cell Ez

  9. g4beamline 2.08 valve assembly counterwound solenoid flux return shield conductors stainless pipe RF cell Virtual detectors LEMC2009 workshop 8-12 Jun 2009

  10. upper middle lower LEMC2009 workshop 8-12 Jun 2009

  11. Simple Phasing via spreadsheet 0o≡on crest L=2λ c=λfz=cβt Ez(z,t) ≈ qEzocos(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 Muons, Inc. ΔE ≈∫Ez(z,z/cβ) dz Ez(z,t) ≈ qEzocos(2πf t + φ) cos(π z/L) Ti≈ Ti-1+ (zi - zi-1)/(cβi-1)

  12. Linac parameters Muons, Inc.

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

  14. Comparison of GPT, OptiM, g4beamline GPT 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.

  15. Ez Ez LEMC2009 workshop 8-12 Jun 2009 Muons, Inc.

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

  17. Synchrotron motion ~ oncrest Pz ~ 1 synch period LEMC2009 workshop 8-12 Jun 2009 t t 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

  18. Transverse motion GPT G4beamline y[m] LEMC2009 workshop 8-12 Jun 2009 z[m] z[m] Muons, Inc.

  19. G4beamline improvements from this work: • fieldmaptimeOffset fixed • (simple bug fix) • pillbox autoTune being added • (tune for max,min ΔE or Δt rather than assume Δv=0) LEMC2009 workshop 8-12 Jun 2009 Muons, Inc.

  20. Linac – near term plans • greatly improve RF phasing capability of G4beamline • optical rematch of linac to cooling channel • optimize longitudinal and transverse acceptance • determine energy deposition in components • prepare the transfer line to RLA I

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

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