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Transfer Lines

Transfer Lines. D. Raparia March 8,2001. Transfer Lines & Ring. ISSUES. VERY HIGH PROTON POWER UNPRECEDENTED NUMBER OF PROTON ACCUMULATION 2 X 10 14 SPACE CHARGE LOSS AND COLLIMATION INSTABILITIES AND IMPEDANCE HANDS ON MAINTENANCE LIMIT LOSS TO < 1 WATT / m (10 -4 LOSS )

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Transfer Lines

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  1. Transfer Lines D. Raparia March 8,2001 RAPARIA/ASAC 2001/02/5-7

  2. Transfer Lines & Ring RAPARIA/ASAC 2001/02/5-7

  3. ISSUES • VERY HIGH PROTON POWER • UNPRECEDENTED NUMBER OF PROTON ACCUMULATION 2 X 1014 • SPACE CHARGE • LOSS AND COLLIMATION • INSTABILITIES AND IMPEDANCE • HANDS ON MAINTENANCE • LIMIT LOSS TO < 1 WATT / m (10-4 LOSS) • STRICT PROTON DISTRIBUTION REQUIREMENTS AT THE TARGET • INJECTION PAINTING • RELIABILITY, AVAILABILITY AND MAINTAINABILITY RAPARIA/ASAC 2001/02/5-7

  4. Layout of HEBT RAPARIA/ASAC 2001/02/5-7

  5. Functions of HEBT More Than a Transfer Line ! • Optical and Dispersion Matching to Linac and Ring • Linac Energy Jitter Correction • Increase Energy Spread (ARMS) • Characterization of the Linac Beam( L-Dump ) • Cleans Halo, Protect Ring injection • Cleans momentum tail from linac • Diagnostics RAPARIA/ASAC 2001/02/5-7

  6. Transport Output for HEBT RAPARIA/ASAC 2001/02/5-7

  7. H Minus Stripping Where B=dipole field(T); A1~ 8x10-6 V*s/m; A2 ~ 4.3 x 109 V/m RAPARIA/ASAC 2001/02/5-7

  8. Lorentz Stripping of H- in HEBT Where B=dipole field(T); A1~ 8x10-6 V*s/m; A2 ~ 4.3 x 109 V/m RAPARIA/ASAC 2001/02/5-7

  9. Vacuum Stripping RAPARIA/ASAC 2001/02/5-7

  10. LINAC TO RING INTERFACE PARAMETER Trans. Emitt. < 0.5 pi mm mr (norm, rms) Energy spread ±0.3 MeV (rms) Bunch spread ±1.5 deg (rms) Energy centroid error ± 1.5 MeV max Phase centroid error ± 2 degrees Beam halo outside 5 sigma <10-4 Beam chopper gap < 10-4 RAPARIA/ASAC 2001/02/5-7

  11. Transverse Emittance (HEBT) Without Collimator RAPARIA/ASAC 2001/02/5-7

  12. Transverse Emitance (Cont.) RAPARIA/ASAC 2001/02/5-7

  13. Transverse Emitance (Cont.) RAPARIA/ASAC 2001/02/5-7

  14. Transverse Emittance (Cont.) RAPARIA/ASAC 2001/02/5-7

  15. RAPARIA/ASAC 2001/02/5-7

  16. RAPARIA/ASAC 2001/02/5-7

  17. Impact parameters and efficiency RAPARIA/ASAC 2001/02/5-7

  18. Achromat Momentum Tail Clean Up • Total Phase advance 360 degrees. • Resolution • Energy resolution ~4.3mm/MeV • Momentum Acceptance ±1%

  19. Phase and Energy Jitter Out of Linac RAPARIA/ASAC 2001/02/5-7

  20. Working of ECC E =V0 sin(Slip) =>V0=E/sin(Slip) Jitter(max)=sin-1(Eaecc/V0) RAPARIA/ASAC 2001/02/5-7

  21. Phase Slip per MeV as Function of Distance of Cavity from Linac RAPARIA/ASAC 2001/02/5-7

  22. Phase Slip at the Energy Corrector Cavity RAPARIA/ASAC 2001/02/5-7

  23. Phase Space at end of Linac RAPARIA/ASAC 2001/02/5-7

  24. Phase Space before the Corrector RAPARIA/ASAC 2001/02/5-7

  25. Phase Space after the Corrector Cavity RAPARIA/ASAC 2001/02/5-7

  26. Energy Corrector Cavity Linac phase and amplitude error of 0.5 deg in phase and 0.5% in amplitude ± 1.5 MeV (max) energy error which has to be corrected RF cavity (805 MHz) before the achromat 110 m from the linac phase slip 23 deg/MeV Required voltage = 2.6 MV Cavity is similar to cavity of the CCL 1.3 m long, 5.0 cm diameter aperture RAPARIA/ASAC 2001/02/5-7

  27. Energy Spread in the HEBT RAPARIA/ASAC 2001/02/5-7

  28. Energy Spread by Phase Scan RAPARIA/ASAC 2001/02/5-7

  29. Energy Spreader Cavity Energy spreader cavity is in the first half cell after the achromat and is also similar to the last cavity of the CCL Length 1.3 meter Aperture (diameter) 5.0 cm Frequency 805 MHz ±100 kHz Required voltage 3.5 MV RAPARIA/ASAC 2001/02/5-7

  30. QF QD QD QF QF Absorber Dipole Stripper Absorber Absorber Stripper X Stripper Y H- Collimation QF RAPARIA/ASAC 2001/02/5-7

  31. Linac/HEBT interface (trans.) • Nominal norm. rms emittance: 0.5 mm mr • Larger emittance compromises power & loss/activation • Injection dump accepts 10% power • Movable transverse collimator for protection; takes 1% power • Chamber aperture: HEBT rf cavity … RAPARIA/ASAC 2001/02/5-7

  32. Linac/HEBT interface (long.) • Nominal energy jitter limit: +/- 2.2 MeV • Nominal rms energy spread: 0.3 MeV • Impact of beam loading, Lorentz detuning, and microphonics (under study) 1-on-1 controlled • Movable energy collimator; corrector limit & ring acceptance • Two locations of energy corrector reserved (present & future) RAPARIA/ASAC 2001/02/5-7

  33. RTBT to Target IDD Beam window 2 m in front of target, RAPARIA/ASAC 2001/02/5-7

  34. RTBT LAYOUT RAPARIA/ASAC 2001/02/5-7

  35. Transport Output for RTBT RAPARIA/ASAC 2001/02/5-7

  36. Target Beam Position Immune to Kicker Failure RAPARIA/ASAC 2001/02/5-7

  37. RTBT/Target interface • Tolerable to one extraction kicker failure • Beam position on target not moved upon kicker failure • RTBT collimator for accident protection • Accelerator-target interface involves many aspects: painting, halo, window scattering, collimation, ... RAPARIA/ASAC 2001/02/5-7

  38. Beam Spreading The beam spreader consists of five 36 cm diameter quadrupoles near the end of the RTBT, to provide the desired beam size the target (70 mm x 200 mm) The flatting of the beam density distribution on target is achieved by providing a uniform distribution out of ring, through painting in the x and y planes at injection. The calculation of the distribution on the target includes the effects of scattering in the 4 mm inconel window, located 2 m in front of the target. A profile monitor in front of the target will monitor the target density distribution and trigger a fast beam abort if the density exceeds a threshold. RAPARIA/ASAC 2001/02/5-7

  39. RTBT-Target RAPARIA/ASAC 2001/02/5-7

  40. Scattering From Windows RAPARIA/ASAC 2001/02/5-7

  41. Scattering From Windows Mult.+Nucl. Scattering Incident beam Multiple. Scattering RAPARIA/ASAC 2001/02/5-7

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