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Electron Beam Polarimetry for EIC/eRHIC

Electron Beam Polarimetry for EIC/eRHIC. W. Lorenzon (Michigan). Introduction Polarimetry at HERA Lessons learned from HERA Polarimetry at EIC. EIC/eRHIC. How to measure Polarization of e - , e + beams?. Other Labs employing Electron Polarimeters. Electron Polarization at HERA.

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Electron Beam Polarimetry for EIC/eRHIC

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  1. Electron Beam Polarimetry for EIC/eRHIC W. Lorenzon (Michigan) • Introduction • Polarimetry at HERA • Lessons learned from HERA • Polarimetry at EIC

  2. EIC/eRHIC

  3. How to measure Polarization of e-, e+ beams?

  4. Other Labs employing Electron Polarimeters

  5. Electron Polarization at HERA

  6. Principle of the Pe Measurement with the Longitudinal Polarimeter Eg l (2.33 eV) e (27.5 GeV) a back scattered Compton photon Calorimeter Compton Scattering: e+lg e’+ Cross Section: ds/dEg=ds0/dEg[1+PePlAz(Eg)] ds0, Az: known (QED) Pe:longitudinal polarization ofe beam Pl: circular polarization (1) of laser beam

  7. Compton Polarimetry

  8. Compton Polarimetry at HERA

  9. Experimental Setup – Laser System

  10. Experimental Setup - Details

  11. Systematic Uncertainties

  12. Polarization-2000 Final Cavity Mount for travel

  13. Polarization after Lumi Upgrade

  14. Lessons learned from HERA

  15. 2GeV (5GeV) e 2-10 GeV IP12 p IP10 IP2 RHIC IP8 IP4 IP6 EIC: Collider Layout • Proposed by BINP and Bates • e-ring is ¼ of RHIC ring length • Collisions in one interaction point • Collision e energies: 5-10 GeV • Injection linac:2-5 GeV • Lattice based on ”superbend” magnets • polarization time: 4-16 minutes • Conventional magnets (Sokolov-Ternov) • polarization time: 10-320 minutes • 25-250 GeV protons, 100 GeV/u Au ions (+79)

  16. Polarimetry at EIC

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