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Beam Instrumentations: Requirements for Proton and Electron Beams

Beam Instrumentations: Requirements for Proton and Electron Beams. C. Bracco, E. Gschwendtner, B. Goddard, M. Meddahi, A. Petrenko, F. Velotti Acknowledgements: WP3 and WP4 members, P. Muggli and A. Caldwell. Outlines. Introduction Layout and optics

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Beam Instrumentations: Requirements for Proton and Electron Beams

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  1. Beam Instrumentations: Requirements for Proton and Electron Beams C. Bracco, E. Gschwendtner, B. Goddard, M. Meddahi, A. Petrenko, F. Velotti Acknowledgements: WP3 and WP4 members, P. Muggli and A. Caldwell

  2. Outlines • Introduction • Layout and optics • Electron and proton beam integration (side-injection, on-axis injection) • Electron beam line • Beam characteristics • Lattice • Wish list for diagnostics • Proton beam line • Beam characteristics • Lattice • Wish list for diagnostics • Summary

  3. Reminder Three beams into the game! Phase 1 (2016): protons + laser beam  prove SMI Phase 2 (2017): protons + laser + electron beam  probe acceleration 7.16 %

  4. Proton and Electron Beam • Common beam line last ~4.4 m before plasma cell C. Magnier, F. Galleazzi

  5. Proton and Electron Beam Side injection 10 m 10 m Off axis!! e s=801m e 15-25 mm 40 mm 40 mm p <0.5 mm p 20 mm On axis injection 40 mm 24 mm 20 mm

  6. Electron Beam Line F. m. Velotti On-axis inj * * tot. envelope: 2x Envelope Hor/Ver beam pipes Ø: 15-25 mm Quads inside the connection tunnel e- Final triplet e- p+

  7. Electron Beam Line F. m. Velotti • Emittance measurement at beginning of the line • Available space (~50 cm) between elements in the connection tunnel • Vertical dispersion non-zero • Beam size at the plasma cell • BPMs for correction assuming 1vs1 strategy • 14 (1 per quad) + 2 before the plasma cell • 6 of them in the common part with p+ • Momentum measurements • Spectrometer at the end of RF gun? At one of the h-bends? • Bunch length measurements • Current measurements

  8. Electron Beam Line F. m. Velotti • Emittance measurement at beginning of the line • Available space (~50 cm) between elements in the connection tunnel • Vertical dispersion non-zero • Beam size at the plasma cell • BPMs for correction assuming 1vs1 strategy • 14 (1 per quad) + 2 before the plasma cell • 6 of them in the common part with p+ • Momentum measurements • Spectrometer at the end of RF gun? At one of the h-bends? • Bunch length measurements • Current measurements

  9. Proton Beam Diagnostics for single bunches! ~74 times lower intensity than CNGS • Specifications (based on LHC TL and HiRadMat requirements) for the unchanged part of the beam line (everything installed upstream of BTVG.412108) : • BPM: • 0.2 mm total accuracy • Resolution: 0.1 mm (within 20 mm radius) • BCT: • 1->2% absolute precision • BTV: • Beam size precision: 0.1 mm • BLM: • Detect local loss of 5e8 charges

  10. Changes in the Proton Beam Line ~ 90 m Instrumentation presently installed: BTVG.412108 BPG.412211 BLM.412243 BPG.412321 BPG.412424 BTVG.412424 BFCT.412425 BTVG.412434 BLMr.412445/BLMl.412445 BPG.412444 BTV.412445 BPKG.412449 Possible to reuse? (provided required modifications) Target Area (not possible to reuse)

  11. What is Needed in the “New Line”? BPG BPG BPG BPG BPG BPG

  12. What is Needed in the “New Line”? BPG BPG BPG BPG BPG BPG BPG

  13. Proton and Laser Beam Plasma cell newBPG BPG Laser ± 8 mm Proton Not real bottleneck ~7 mm (it must be > 5 mm!) newBPG ± 6 mm BPG

  14. What is Needed in the “New Line”? BPG BPG BPG BPG BPG BPG BPG BPG BPG BPG BPG

  15. Required Pointing Accuracy

  16. Required Pointing Accuracy

  17. Beam Envelope at BPMs Interlocked! Downstream of plasma cell Extraction from SPS must be stopped if beyond tolerances: 100 mm and 15 mrad ** end position * 50 mm (inner diameter) vacuum chamber for new B190 dipoles, to be checked if still compatible with 60 mm aperture at BPMs (J. Hansen) *** side injection/ on axis injection

  18. What is Needed in the “New Line”? BTV BTV BTV BTV BTV

  19. Proton Beam Line Optics Requirements Round beam with a beam size @ plasma cell entrance 1 s = 200 ± 20 mm Achieved: 1 s = 202 mm

  20. Beam Envelope at BTVs Position and beam size measurements Downstream of plasma cell The last two BTVs have to be used also for the proton and laser beam setup (position: two beams coaxial)  a screen has to be added for the laser beam (reduced power during setup, see Mikhail’s talk) The Monitor downstream can be used also for the e-beam * side injection/ on axis injection

  21. What is Needed in the “New Line”? BLM BLM BCT BLM @ location of vertical bottleneck (5e8 charges) BCT: 1-2% absolute precision

  22. Summary 1/2 • Electron beam line: • Completely new diagnostics to measure: • Emittance • Energy • Beam size @ plasma cell • Beam position • Bunch length • Current • Proton beam line: • Adapt existing diagnostics for AWAKE operation (1 bunch) up to BTVG.412108 (excluded) + reuse part of remaining diagnostics • Five additional BPM • Two additional monitors for beam size measurements of the p beam and position measurements for p and laser

  23. Summary 1/2 • Main challenges: • Coexistence of the e an p beams • Reduced beam pipe diameters (15-24 mm) • Almost no space around the beam pipes in common part of the lines (we’ll try to optimize the lattice): • How to implement pickups for position measurements? • How to perform beam profile measurements? • Required very high accuracy in position measurements for p and laser beam • Low electron energy and current • The option of having a unique design for on axis and side-injection is being evaluated: double diagnostics at the end of the line…..

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