1 / 16

Electron Beam Polarimetry for EIC/eRHIC

This document provides a comprehensive overview of electron beam polarimetry techniques applicable to the Electron-Ion Collider (EIC) and its predecessor, eRHIC. It discusses polarimetry advancements showcased at HERA, highlighting the measurement of electron and positron polarization through Compton scattering methods. The report includes detailed experimental setups, insights into systematic uncertainties, and lessons learned from past experiments. It aims to facilitate effective polarization measurements in future collider experiments, optimizing beam quality and collision dynamics.

rumer
Télécharger la présentation

Electron Beam Polarimetry for EIC/eRHIC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related