KLF beamline meeting - July 12, 2024

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Agenda

  • Announcements
  • CPS simulation updates (Pavel)
  • Do we need photon beam in the hall during KLF? (Sean, Mikhail, Ig)
  • Any other business

Minutes

Present: Hovanes, Chris, Tim, Josh, Vitaly, Eugene, Beni, Edy, Richard, Marshall, Sean, Pavel


  • Hovanes announced that KLF is at the stage where procurements with large amounts are going to be made soon. KLF leadership will need to carefully check the drawings of the beamline components as they become available to make sure that they satisfy the needs of the core physics program of the experiments. It is not necessary to check the mechanical stability, thermal aspects, or the radiation control issues assuming that they have been addressed by the experts. The drawings will be posted by Tim or Hovanes as they become available well before Purchase Requests are submitted.



  • Chris discussed the current status of the KLF cryo-target, see his presentation for details.
  • The target cell will be 40cm long and 6cm in diameter. It will support LH2 and LD2. It is highly unlikely that the sign will be able to accommodate liquid helium target. If there are plans for liquid helium, Chris would have to be notified about those as soon as possible.
  • The liquid in the cell will be boiling which will sightly reduce the density of the target. The bubbles will form on the button and propagate up. It is expected to be stable without bursts.
  • Chris expects to have 9 hours of cool-down time, 90 minutes of refill time and 45 minutes emptying time. They can evacuate the hydrogen gas from the cell if the experiment needs a really empty target operations.
  • KLF target cell will use more liquid hydrogen volume than for GlueX, therefore either the gas tanks will need to be larger, or the gas pressure will need to be higher (45psi) than for GlueX. Chris is currently leaning towards latter.
  • Thicker aluminum walls for the target.
  • New carbon fiber scattering chamber will need to be manufactured. Similar one have been used in the other halls.
  • Switching between LH2 and LD2 will take about 24 hours. The run plans will need to be properly adjusted.
  • There needs to be a meeting with engineers and designers of the target group and Hall D to decided on size of the new scattering chamber and to suggest the length of the target cell that would not extend upstream of the plumbing material of the target.
  • Tim W., Chris K. and James Brock will exchange necessary information/drawings/models before the meeting is arranged.
  • Eugene commented that current plans for upgrading the Start Counter do not include changing the scintillators.


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