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CASA Collider Design Review Retreat Other Electron-Ion Colliders: eRHIC, ENC & LHeC

CASA Collider Design Review Retreat Other Electron-Ion Colliders: eRHIC, ENC & LHeC. Yuhong Zhang February 24, 2010. 5 – 10 GeV e-ring. 5 -10GeV full energy injector. RHIC. e-cooling (RHIC II). eRHIC: Ring-Ring. Based on existing technology Collisions at 12 o’clock interaction region

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CASA Collider Design Review Retreat Other Electron-Ion Colliders: eRHIC, ENC & LHeC

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  1. CASA Collider Design Review RetreatOther Electron-Ion Colliders:eRHIC, ENC & LHeC Yuhong Zhang February 24, 2010

  2. 5 – 10 GeV e-ring 5 -10GeV full energy injector RHIC e-cooling (RHIC II) eRHIC: Ring-Ring • Based on existing technology • Collisions at 12 o’clock interaction region • 10 GeV, 0.5 A e-ring with 1/3 of RHIC circumference (similar to PEP II HER) • Inject at full energy 5 – 10 GeV • Polarized electrons and positrons

  3. eRHIC Ring-ring: Full Energy Injection Options Recirculating SC linac Recirculating NC linac • Injection of polarized electrons from source • Ring optimized for maximum current • Top-off Figure 8 booster synchrotron, FFAG or simple booster

  4. eRHIC Ring-ring: Parameters

  5. eRHIC Ring-ring: e-Ring Design • Two 180° arc sections • 84 FODO cells with 10.86 m length • vertical betatron phase advance fixed at 60°, • horizontal betatron phase advance tuneable between 30° to 80° • Dispersion suppressors at each end of an arc • Energy loss per turn for 10 GeV: 10.9 MeV x I (A) • Damping wiggler or super-bend for low beam energy

  6. eRHIC Ring-ring: Dynamical Aperture • Momentum acceptance: • At injection: at least 0.5% of injection energy • In the ring: at lease 7 σE • Dynamical aperture: large than 10 σ • Damped energy spread • 1x10-3 for 10 GeV • 0.5x10-4 for 5 GeV • Dynamical aperture is sensitive to betatron tune working point • Tracking 1024 turns with natural horizontal emittance and half for vertical emittance

  7. eRHIC Ring-ring: Other Studies • Beam Instabilities • Single & coupled bunch instabilities, HOM heating, ion related effects, electron cloud • Provide calculation results on inpedance budget, transverse mode coupling instability, longitudinal microwave instability threshold, longitudinal coupled bunch instability, transverse coupled bunch instability, fast beam-ion instability, • Beam-beam issue • Beam polarization • RF in electron ring • Electron cooling

  8. Yellow ion ring makes 3m vertical excursion. Design incorporates both normal and superconducting magnets. Fast beam separation. Besides the interaction point no electron-ion collisions allowed. Synchrotron radiation emitted by electrons does not hit surfaces of cold magnets (Red) electron beam magnets (Blue) ion ring magnets Detector (Yellow) ion ring magnets eRHIC Ring-ring: Interaction Region

  9. eRHIC Ring-ring: IR design Scheme • No crossing angle at the IP • Linac-ring: larger electron beta*; relaxed aperture limits ; allows round beam collision geometry (the luminosity gains by a factor of 2.5). • Detector integrated dipole: dipole field superimposed on detector solenoid.

  10. eRHIC Ring-ring: Interaction Region

  11. eRHIC: ERL-Ring

  12. eRHIC ERL-Ring: Full Energy

  13. eRHIC ERL-Ring: Parameters

  14. eRHIC ERL-Ring: Recent Developments Presentations at Stony Brook EIC Meeting, Jan. 2010

  15. Electron Nucleon Collider at FAIR

  16. ENC@FAIR: Parameters

  17. ENC@FAIR: Interaction Region

  18. LHeC: Ring-Ring

  19. LHeC Ring-Ring: Interaction Region foresees simultaneous operation of pp and ep J.Dainton et al, JINST 1 P10001 (2006)

  20. LHeC: Linac-Ring

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