PPB - April 12, 2023

Meeting Coordinates

• On-site => Wednesdays @ 11am EDT in TL-2236
• Zoom => https://jlab-org.zoomgov.com/j/1616149761?pwd=SDJKY3NhWEtBOUR5MVR5RlY1R1pHdz09&from=addon

Agenda

• IPAC'23 - Joe, Amy, Reza, Eric - Which day is your poster? Plan to circulate poster and proceedings?

• Joe - Contribution #1313 submitted to IPAC’23 entitled "Status of Ce+BAF: Polarized Positron Beam Capability at CEBAF 12 GeV" (programme code: MOPL152, https://www.overleaf.com/read/vqnhmpkrddbh - circulates this Thursday
• Reza - Presents Wed, circulates this weekend
• Andriy - "Conceptual Design of a High-Power Target for Positron Production at CEBAF": https://www.overleaf.com/5323634316yytsftvttywt
• Amy - ...

• Max - Status of PEPPo-II LDRD proposal
  • Andriy's simulations
    • max e+ yield 6e-4 at 1 mm thickness
    • emittance cuts do not change this very much despite increase in beam size
    • deposited power favors thinner targets (but thermal conductivity may not?)
  • Chicane layout and integration into existing space: mostly determined by space constraints
    • 
    • after 0L02, make use of existing DP can, fast valve, at least 2 quads
    • could start at 5D line, gives us BCM and third quad for free, but perhaps not enough space
    • to use existing viewer, harp, quads, and FC2: reinject before ITV0L03?
  • whole chicane should work with 7 MeV electrons, but east leg must be achromatic on its own
  • RF positron capture does not seem viable (cost, power, time, space, everything)
  • Rough grocery list
    • west leg: 2 DL dipoles (scavenged), 1 valve, 4 correctors, 1+ BPM, 3 QD quads (2 can be easily scavenged). This is assuming achromatic design like UITF, but length is a problem (~ 2.5 m). Can choose to ignore dispersion... There are various design choices but no risks.
    • 
    • target line: 2 quads, 2 BPMs, 2+ correctors, 1 DP can, 1 valve, target, 2 solenoids, 2 apertures. No risks up to target, then dependent on capture simulation
    • east leg: needs lots of simulation to determine what we need; at least 2 special dipoles (maybe CFM), 1 aperture, 1 lens, 1 valve
    • 
    • 20+ magnet channels necessitates extra trim rack in ISB?
    • vacuum pumps TBD but likely not negligible
• Status from target working group
• Bob - status of SRF toy model
• Any other business...

Upcoming

• April 19 - Joint meeting with PWG
• May 7-13 - IPAC'23 (Joe, Amy, Reza, Eric)
• May 15-19 - LCWS (Andriy, Carlos)