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Simulation of the e+ Source up to the CLIC Damping Ring

Simulation of the e+ Source up to the CLIC Damping Ring. A. VIVOLI* Thanks to: L. RINOLFI (CERN) R. CHEHAB (IPNL & LAL / IN2P3-CNRS) O. DADOUN, F. POIRIER, P. LEPERCQ, A. VARIOLA (LAL / IN2P3-CNRS) V. STRAKHOVENKO (BINP) K. FLÖTTMANN (DESY). * E-mail : Alessandro.Vivoli@cern.ch.

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Simulation of the e+ Source up to the CLIC Damping Ring

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  1. Simulation of the e+ Source up to the CLIC Damping Ring A. VIVOLI* Thanks to: L. RINOLFI (CERN) R. CHEHAB (IPNL & LAL / IN2P3-CNRS) O. DADOUN, F. POIRIER, P. LEPERCQ, A. VARIOLA (LAL / IN2P3-CNRS) V. STRAKHOVENKO (BINP) K. FLÖTTMANN (DESY) * E-mail : Alessandro.Vivoli@cern.ch

  2. CONTENTS • General scheme of the CLIC positron source • Design and Simulation of the elements • Conclusions A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  3. CLIC Main Beam Injector Complex (2009) IP e- Main Linac e+ Main Linac e- BC2 e+ BC2 12 GHz 12 GHz 8 GeV 48 km 3 TeV Base line configuration Booster Linac 5.14 GeV 4 GHz e+ BC1 4 GHz e- BC1 4 GHz 2.86 GeV 2.86 GeV e- DR e+ DR e- PDR e+ PDR 2.86 GeV 2.86 GeV Unpolarized e+ Injector Linac 2.66 GeV 2 GHz e-/g Target g/e+ Target Laser Primary beam Linac for e- 5 GeV Pre-injector Linac for e+ 200 MeV Pre-injector Linac for e- 200 MeV DC gun Polarized e- 2 GHz 2 GHz e- gun AMD 2 GHz

  4. POSITRON SOURCES USING CHANNELING FOR ILC & CLIC • PROPOSED POSITRON TARGET FOR CLIC 2 m e+ e- g e+, e-, g (5 GeV) e- Amorphous Crystal W: 1.4 mm thick W: 10 mm thick N. simulated e- : 6000 sr=2.5 mm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  5. Gamma Production By V. STRAKHOVENKO PHOTONS SPECTRUM SPOT SIZE CHANNELING: Ng = 111942 Ng / Ne- = 18.657 Eg = 170.37 MeV Ee- = 5 GeV sr = 9.85 mm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  6. Positron Production By O. DADOUN Positron Beam Parameters at the target A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  7. Adiabatic Matching Device • Length: L = 20-50 cm • Magnetic field at the target : B0 = 6 T • Magnetic field at the end : B(L) = 0.5 T • Magnetic Field Behaviour : A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  8. AMD RESULTS A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  9. CAVITY 100 KW CW (P. Lepercq) L= 58.96886 cm Fr = 1.99915469674 GHz Iris : r = 20mm Ezmax(r=0)= 5.2 MV/m

  10. Capture Section Design 63 Cavities Target AMD e- g g e+ (200 MeV) Solenoid • AMD • Length : L = 20 cm • Magnetic Filed: B = 6 - 0.5 T • Final Aperture: r = 2 cm • Accelerating cavities: • Number of cavities: N = 63 • Length: L = 60 cm • Max Energy Gain: DE = 5.95 MeV • Maximum Gradient: Ez (r=0) = 25 MV/m • Frequency: n = 2 GHz • SOLENOID • Length : L = 41 m • Magnetic Filed: B = 0.5 T • Drift Tube Aperture: r = 2 cm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  11. Capture Results To be optimized… A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  12. Capture Section (+ Bunch Compressor) Adiabatic Matching Device Chicane Pre-accelerator Target Crystal To the accelerator e- e- e- g g e+ Magnet LINAC 2 GHz e+ Bending Magnets Drift Solenoid Cavities Magnetic field Electric field A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  13. Bunch Compressor Design Magnetic Chicane TW structure e+ Quadrupoles A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  14. Bunch Compressor Elements • Quadrupoles: • Number: N = 14 • Length: L = 20-40 cm • Gradient: G = 1.5 – 4.7 T/m • Aperture: r = 5-15 cm • Accelerating cavities: • Number of cavities: N = 1 TW • Length: L = 3.9 m • Average Gradient: Ez = 14.5 MV/m • Frequency: n = 2 GHz • Bending Magnets: • Number: N = 4 • Length: L = 30 cm • Magnetic Field: B = 0.3513 T • Drift Tubes: • Number: N = 28 • Aperture: r = 5-10 cm • Length: L = 10 - 40 cm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  15. MAGNETIC CHICANE   103 mm for =172 mrad e+ - 0.30 m 0.30 m 0.30 m - 0.30 m 0.296 m 0.30 m 0.296 m BS1 BS2 BS3 BS4 • Chicane Modeling: • Bending angle:  = 9.87 deg • Drift: l = 30 cm • Diaphragm: r = 4.0 cm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  16. Bunch Compressor Results A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  17. Injector Linac I (800 MeV) From A. Ferrari et al., CLIC Note 626-655-723 TW structures Quadrupoles A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  18. Injector Linac II (1.5 GeV) TW structures Quadrupoles A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  19. Injector Linac III (2.86 GeV) TW structures Quadrupoles A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  20. Injector Linac Elements • Quadrupoles: • Number: N = 196 • Length: L = 40-60 cm • Gradient: G = 1.0 – 18.5 T/m • Aperture: r = 5-15 cm • Accelerating cavities: • Number of cavities: N = 49 TW • Length: L = 3 - 4.5 m • Average Gradient: Ez = 14.5 MV/m • Frequency: n = 2 GHz • Drift Tubes: • Number: N = 50 • Aperture: r = 5 cm • Length: L = 200 - 280 cm A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  21. Injector Linac Results To be optimized… e+ in PDR: 2747; Yield e+/e- =0.458 A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  22. Conclusions • In order to have 4.6 109 e+ in PDR we need: 4.6 109/0.458=10 109 e- in primary electron beam on crystal. • According to Dadoun et al., CLIC Note in preparation: PEDD = 22.14*10 109 / 7.5 109 = 29.5 J/g < 35 J/g but close. • Optimization of the parameters for non-polarized positrons is necessary and will be done soon. • Configuration at 500 GeV and double charge not possible with only 1 fixed tungsten target for the moment. • Utilization of different codes for simulations (PARMELA, PLACET, GEANT4,…) will be done. A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

  23. THANKS. The End A. Vivoli, CLIC Positron Source, CLIC 2009, CERN

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