KLF beamline meeting - October 17, 2024

Agenda

• Announcements

• Beam tests in 2025 and beam bleed-through (Riad, Edy)

1. MOLLER related Beam Tests: (Note: laser is back to 249.5 MHz, need to switch to low-rep laser (need one shift))
   1. Study photocathode effects from KLong beam
   2. Deliver Hall D Low-rep Rate and High Bunch Charge Beam to Hall
2. Hall D Bleed-through:
   1. RF bleed-through results from bad RF Separator phasing in Beam Switch Yard. This can be eliminated.
   2. Bleed-through that originates at injector because each drive laser produces some dc beam that bleeds across all three chopper slits. We measured bleed-through in injector using different lasers (Mode-Locked laser vs. Gain-Switched lasers, but measured the same level of bleed-through as our gain-switched based drive lasers. All empty RF buckets will be filled with bleed-through currents. Other halls worried about effect on polarization, otherwise no issues. KLong should worry about accidentals and timing. Accelerator wants a requirement document. Bleed-through can be measured in injector. We will need to submit a beam test request. KLong DAQ should also receive a 15.6 MHz timing signal from Injector.

• FLUKA simulations (Pavel)

• Updates from GEANT4 simulations (Richard)

• Hypernuclei station (Mikhail)

• Engineering update (Tim)

• Any other business

Minutes

Present:

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