KLF beamline meeting - October 10, 2024

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Agenda

  • Announcements
  • Bleedthrough beam (Edith)
  • K-long rate calculations (Eugene)
  • Engineering update (Tim)
  • Any other business

Minutes

Present: Tim, Josh, Igor, Hovanes, Mikhail, Moskov, Eugene, Edy, Vitaly, Sashi, Lubomir, Justin, Marshall, Richard



  • Edith had a discussion with the BTeam of the accelerator division regarding the bleed-through beam during KLF.
  • The current expectation is that the bleed-through is going to be on the order of 1% from the "peak" value. If the "peak" value is 5 μA (which is the averaged current for KLF), then the bleed-through current would be 50nA. They needed more information on what is the impact of the bleed-though for KLF. And BTeam would like to have some specification on what level of bleed-through KLF can tolerate.
  • Hovanes explained that the out-of-time bleed-through fills the time interval between the 64ns bunches that was deliberately created to allow us to measure the kaon momentum. All out of time bleed-through kaons will be interpreted as low momentum kaons thus causing potential problems for physics analysis at low kaon beam energies.
  • Moskov commented that Vitaly has done some analysis of Kn final state and studied the impact of a background channel on the yield at 0.1% bleed-through level. According to the preliminary results of this analysis, the background of 0.1% would not cause major problems.
  • Moskov also mentioned that having a 128ns beam bunching may allow us to measure the impact of the bleed-through.
  • There was a discussion about the priority and the schedule for measurements needed to evaluate the compatibility of KLF and MOLLER experiment. These measurements got delayed multiple time. Edy thought that there is no plan to do it during upcoming run, but Edy will check with the injector group about their plans. Hovanes pointed out that KLF needs to have the results by this summer when we expect the next readiness review (ERR-2).
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