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AWAKE Primary Beamlines
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  1. AWAKE Primary Beamlines C. Bracco, J. Bauche, B. Goddard, E. Gschwendtner, G. Le Godec, L. Jensen, M. Meddahi, J.A. Osborne, A. Pardons, H. Vincke

  2. Outline • TT61 Option: • Preliminary Layout and Optics Studies • RP and Geometric Constraints • Limitations and Possible Solutions • Requirements and Time Estimates • CNGS Option: • Requirements and Time Estimates • Electron Beam Line

  3. AWAKE in TT61 Line TT61 tunnel to west hall TI 2 to LHC TT60 from SPS HiRadMat primary beam line (TT66) HiRadMat facility

  4. AWAKE in TT61 Line Beam from SPS Modification of TT66 8 new switching magnets • New AWAKE beam line. Large slope of 8.5 % of TT61 tunnel some equipment of previous H3 beam line in TT61 tunnel still present T1 target shielding dismantled  available free space for switch magnets HiRadMat primary beam line (TT66), fully operational, no changes in layout expected

  5. TT61 Existing Tunnel 8.5% slope = 4.85° Old line: 200 GeV beam  Br ~ 670 T m (protons) New line: 450 GeV beam  Br ~ 1530 T m (protons) ~1.2 m TT61 Gallery cross section

  6. TT4-TT5: RP Constraints Civil engineering works required! • Dump 2 m underground • Beam deflected by 2° Laser 1 QTLD 2 QTLF Beam from TT61: 0 vertical angle 3 QTLD Floor 3MBA Plasma Cell MBB and MBA: B = 2.1 T 2 QTLF 1MBB Dump 2°

  7. TT4-TT5 TL Optics Studies Final Focusing QF QF QF QF MBA MBA MBA MBB QD QD QD QD At Plasma cell entrance: bx=by=5 m ax=ay=0 m Plasma Cell

  8. TT4-TT5 TL Optics Studies Final Focusing QF QF QF QF MBA MBA MBA MBB QD QD QD QD At Plasma cell entrance: Dx= 0 m Dy=-0.2 m Beam size at Plasma cell entrance: 1 sx = 190 mm 1 sy = 280mm (Dp/p =1E-3) Plasma Cell

  9. TT4-TT5 Area Layout Plasma Cell TT5 TT4 New Service gallery Dump

  10. TT4-TT5 Area Layout Start digging the trench after the service gallery  beam higher  exit from TT61 at ~2 m (old 200GeV beam exit at ~1.25 m)  impact on dump depth!! Plasma Cell TT5 TT4 New Service gallery Dump

  11. Preliminary Beamline Design • Magnets: • 8 MBS • 20 vertical bending magnets • 2 horizontal bending magnets • ~ 30 Quads (~20 in TT61 + final focusing) • PC: • ~ 10 units • +Old Line • New Line • - Tunnel

  12. Preliminary Proton Beamline Design • +Old Line • New Line • - Tunnel dump TT5 TT4 TT61 The 450 GeV beam does not fit in the existing tunnel !!

  13. Possible solutions • Fit the 450 GeV beam in TT61  impact on beam angle in TT4-TT5 and on dump depth  RP studies! • Reduce the beam energy to respect all the geometric and RP constraints  check impact on experiment

  14. 450 GeV Beam in TT61 • Magnets: • 8 MBS • 20 vertical bending magnets • 1-2 horizontal bending magnets • ~ 30 Quads (~20 in TT61 + final focusing) • PC: • ~ 10 units • +Old Line • New Line • - Tunnel

  15. 450 GeV Beam in TT61 • +Old Line • New Line • - Tunnel TT5 TT4 TT61 dump ~1.2° angle Dump depth: ~0.5 m Limit in operation (t.b.d. by RP)

  16. Lower Energy: 300 GeV • Magnets: • 8 MBS • ~17 vertical bending magnets • 1 horizontal bending magnets • ~ 30 Quads (~20 in TT61 + final focusing) • PC: • ~ 10 units dump ~2° angle Dump depth: 1.5 m

  17. Impact on Beam Size at 300 GeV Geometric emittancee = 10.9 nm instead of e = 7.2 nm • b = 5m  s = 234 mm instead of 200 mm • b = 3.7 m  s = 200 mm: feasible! At Plasma cell entrance: bx=by=3.7 m ax=ay=0 m Aperture ok Plasma Cell

  18. Magnets and Power Converters • Magnets: • 8 Switches • ~ 20 vertical bending magnets • 1-2 horizontal bending magnets • # Horizontal and vertical correctors t.b.d • ~ 30 Quadrupoles • Power Converters: • ~10 units • Two options: • Design and build new magnets and PC  3 years from specifications + cabling • Re-use existing equipment (inventory needed)  cabling anyhow needed (no manpower available during LS1) • In both cases: first beam in 2017

  19. CNGS Option • Minor modifications of the final focusing system • Magnets and PC already available and in place • Beam instrumentation already available and in place • Re-cabling and new services needed (?) • Possible to increase the energy from 400 GeV to 440 GeV (some margin from 450GeV LHC beam needed for interlock system) really needed? • First beam in 2015 might be feasible (depending on re-cabling/services)!

  20. Electron Beam Line • No studies have been performed up to now • Normally less critical than proton beam (low energy electrons) • Design and production of magnets and PC: • TT61: in the noise of works for proton beam magnets • CNGS: if new design needed  first e-beam in ~2016(?) • To be defined now: • electrons injected from the side of the plasma cell or at the beginning  impact on interface Laser+protons+electrons • Beam parameters

  21. Conclusions • TT61 Option: • Feasibility studies indicate that only lower beam energy can be envisaged (tunnel size, CE work, RP constraints....) • From preliminary study of lower energy beam: beam operation not before 2017 (magnets, all beam line equipments and general services...) • CNGS Option: • Most attractive to meet a sooner beam operation • Less expensive as beam line and equipment already available • Could be staged-installation of the experimental area towards reaching a complete test facility • If CDR to be ready by March 2013, need to conclude during this collaboration meeting on the beam energy (and Co...) so work can proceed