Feb 21, 2023 - CIS Group meeting

Agenda

• Joe (5)
  • JLAAC dry runs next week, maybe 3/3 media:JLab_AAC_Agenda_Mar2023.pdf
  • LDRD will be announced soon, will prioritize Jlab upgrades (22 GeV/e+)
  • Nate proposing significant BPM upgrade, if you want to be at the table (Riad?, Max?)
  • Response to ARDAP LOI due today...
• Carlos/all (25) Gun and SAD jobs
  • Gun install schedule update Media:Gun swap planning ver Apr 4 2023.pptx
  • Media:Gun swap planning 1 week before and 1 week after SAD start.pptx
  • (Max) 200 kV gun optics and 2I steering - https://tasklists.jlab.org/bslist/tasks/108544
  • (Max) 200 keV Wien filter optics - https://tasklists.jlab.org/bslist/tasks/108547
  • (Max) Test IHA0I02 after maintenance - https://tasklists.jlab.org/bslist/tasks/108546
• All (30) Your research projects, deadlines, papers, etc.
  • (Max) Very different focal lengths of the gun field at CEBAF now vs. R30-3
    • Cathode-grid scan, orbit measured with BPMs: fake single-particle scan for comparison with simulation
    • CEBAF gun, measured Jan 18: trajectories (extrapolated), aggregated to RMS, focal length
    • CEBAF gun, GPT: trajectories, aggregated to RMS, focal length
    • R30-3 gun, GPT: trajectories, aggregated to RMS, focal length
    • cannot be extrapolated to high space charge

Upcoming Meetings/Dates

• February 22 (noon), G. Blume (20) Commissioning of the Compton transmission polarimeter (SRF Gun meeting)

• March 2 (11am), Y. Zhou, "Photoemission from biased metal surfaces”, Accelerator Division Seminar

• March 5-10, APS Meeting, Las Vegas (Riad, Matt) - https://march.aps.org/

• March 7-8, U. Va. Positron Working Group Meeting, Charlottesville - https://indico.jlab.org/event/680/
  • Joe Grames (20+5) - Ce+BAF concept and the challenging polarized e- source
  • Andriy Ushakov (15+5) - Positron target design and fatigue studies
  • Sami Habet (15+5) - Concept of a polarized positron injector for CEBAF
  • Dennis Turner (15+5) - Delivering e+ beams from LERF through Ce+BAF

• March 8-10, JLab Accelerator Advisory Committee Review
  • Agenda & charge media:JLab_AAC_Agenda_Mar2023.pdf media:JLAAC_Charge_Mar_2023.docx

• March 15, GSRA Annual Review (1-4 pm)

• March 20, SAD Begins
  • Shawn's recent calendar media:SAD_discussion_300123.pdf

• March 23-24, KEK visit Yoshinori+

• May 7-12, IPAC'23
  • G. Blume et al., "A 5 MeV Compton transmission polarimeter designed for a SRF photogun". media:abstract-1233.pdf
  • J. Grames et al., "Status of Ce+BAF: Polarized Positron Beam Capability at CEBAF 12 GeV" media:abstract-1313.pdf
  • M. Rahman et al., "Quantum Efficiency and Lifetime Study for Negative Electron Affinity GaAs Nanopillar Array Photocathode" media:IPAC23 abstract_Aziz.pdf
  • A. Ushakov et al., "Conceptual Design of a High-Power Target for Positron Production at CEBAF" media:abstract-1794.pdf
  • S. Zhang, "What We Learned From Operating Electron Accelerators with Variable bunch Frequencies at JLab" media:IPAC23 abstract_Zhang.pdf

• May 15-19, LCWS2023 International Workshop on Linear Colliders (Andriy) - https://indico.slac.stanford.edu/event/7467/overview