Compton Transmission Polarimeter

This R&D project is a collaboration between Brookheaven National Lab and Jefferson Lab to develop a Compton Transmission Polarimeter to be used with BNL Polarized SRF Gun.

COMTRA Readiness

• INSTALLATION
  • Installation UITFlist => https://tasklists.jlab.org/uitflist/tasks/107371
  • DC power magnet specific UITFlist => https://tasklists.jlab.org/uitflist/tasks/107370
  • Recent installation photos with UED names media:220914_COMTRA.pptx
  • UED List Version 4 media:comptra_beamline_v4.xlsx
  • UITF logbook => https://logbooks.jlab.org/book/uitflog

• RUN TIME
  • Run Plan UITFlist => https://tasklists.jlab.org/uitflist/tasks/107600
  • Run Plan Version 5 media:COMTRA-RunPlan-v5.xlsx
  • Steps to align x-ray beam media:220920_Table_Steps_v2.pptx
  • UITF Compton Transmission Polarimeter Data Acquisition System
  • Quick Reference v.16 media:UITF_quick_reference_rev.16.pdf
  • Comtra_BeamSetup

Compton Transmission Polarimeter Meetings

• Meeting 9/29/22 - COMTRA - HCO - last meeting
• Meeting 9/22/22 - COMTRA - Final week of HCO is upon us...
• Meeting 9/15/22 - COMTRA - Readiness updates...
• Meeting 9/8/22 - COMTRA - Readiness updates...
• Meeting 9/1/22 - COMTRA - Installation continues...
• Meeting 8/25/22 - COMTRA - Installation has begun...
• Meeting 8/18/22 - COMTRA -
• Meeting 8/11/22 - COMTRA -
• Meeting 8/4/22 - COMTRA -
• Meeting 7/28/22 - COMTRA -
• Meeting 7/21/22 - COMTRA -
• Meeting 7/14/22 - COMTRA -
• Meeting 7/7/22 - COMTRA -
• Meeting 6/29/22 - COMTRA - Shipping and procurement status...
• 6/29/22 - Riad's PI status report to monthly BNL/JLAB meeting media:CompPol_BNL_SRF_Gun_29June2022.pptx
• Meeting 6/23/22 - COMTRA - Been a long time, now taking minutes again...
• 6/02/22 - Chris's recent update media:InjectorDAQ_PurchaseNeeds_2022June2.xlsx Sharepoint file use this one but first please update with the one on the wiki below
• Meeting 3/31/22 - COMTRA - Status and UITF schedule
• 3/16/22 - First rack assembled media:220316_Rack#1.jpg
• 3/16/22 - Compton Magnet Function and Requirements Document media:PMAG0000-0011-S0001 Compton Magnet Func and Req Specs.pdf
• 3/11/22 - Probir's proposed workplan and schedule media:iron core solenoid Magnet Task list.xlsx
• 3/10/22 - Discussion with Cliff @ BNL media:220310_Cliff_CeC.jpeg media:0021m0005_asm.stp.txt (change .txt to .stp)
• 3/3/22 - Status of Gary's "first installation" at UITF, for review media:3-3-22 Compton Polarimeter Layout.pptx
• JLab Compton Transmission Polarimeter - BNL Meeting, March 2, 2022: media:CompPol_BNL_SRF_Gun_02March2022.pdf media:CompPol_BNL_SRF_Gun_02March2022.pptx
• Meeting 2/10/22 - COMTRA - CEBAF Compton removed, discussion of DAQ integration
• Meeting 2/3/22 - COMTRA
• Meeting 1/27/22 - COMTRA - Updates on schedule, layout, radiator, DAQ, polarized target and simulation
• Meeting 1/20/22: organizational meeting for 2022 media:220120_COMTRA.pptx
• Meeting 7/16/21: media:Benjamin-71621.pdf

Project Documents

• (1/27/22) Added link describing the copper radiator built/installed at CEBAF for Bubble experiment, that we'd like to re-use at UITF
• Proposal: media:Proposal_Superconducting_RF_electron_gun.pdf
• Design of a Compton transmission polarimeter, Fernandes Neres Benjamin: media:CompPol_Optimization_B.Fernandes-Neres.pdf
• NP Accelerator R&D PI Exchange meeting on November 30, 2021, "Development of Beam Polarimeter for BNL SRF Gun": media:Accelerator_PI_Meeting_Nov2021_Electron_CompPol_BNL_SRF_Gun.pdf media:Accelerator_PI_Meeting_Nov2021_Electron_CompPol_BNL_SRF_Gun.pptx
• Quarterly Reports
  • FY 21:
    • Q1: media:NP Qtrly Report - Superconducting RF Electron Gun - Q1 2021 - Appendix A JLab Report.docx
    • Q2: media:NP Qtrly Report - Superconducting RF Electron Gun - Q2 2021 - Appendix A JLab Report.docx
    • Q3: media:NP Qtrly Report - Superconducting RF Electron Gun - Q3 2021 - Appendix A JLab Report.docx
    • Q4: media:NP Qtrly Report - Superconducting RF Electron Gun - Q4 2021.docx
  • FY 22:
    • Q1: media:NP Qtrly Report - Superconducting RF Electron Gun - Q1 2022.docx
    • Q2: media:NP Qtrly Report - Superconducting RF Electron Gun - Q2 2022.docx

References

• R Barday et al 2011 J. Phys.: Conf. Ser. 298 012022, Compton transmission polarimeter for a very precise polarization measurement within a wide range of electron currents media:Barday_2011.pdf
• H. Hoogduin, Electron, Positron and Photon Polarimetry, PhD Thesis 1997 media:Hoogduin1997.pdf (see chapter 2 and section on Geant)
• A. Adeyemi and E. Voutier, The Calibration of the PEPPo polarimeter for electrons and positrons, IPAC 2013 media:Adeyemi-IPAC2013-Proc.pdf
• E. Fanchini, The PEPPo e- & e+ polarization measurements, POSIPOL 2012 media:Fanchini_Posipol.pdf
• Townsend Zwart, Electron Polarimetry at MIT Bates (2000): [1]

BNL SRF Gun Beamline and Low Power Beam Dump

• From: Jean Clifford Brutus. In Dropbox [2]:

   Step file of the diagnostics beamline only (0021m0004) including a dwg drawing.
   Step file of the entire CeC beamline (0021m0003) including a dwg drawing.
   Pictures of the area.