HYP Target Meeting 20210427

Target Meeting (HRS-HKS experiment at JLab Hall A)

• 21:00-21:30 on April 26, 2021 EDT (10:00-10:30 on April 27, 2021 JST)
• Participants: David Meekins (JLab), Toshiyuki Gogami (Kyoto Univ.)
• via BlueJeans

Discussion

• The idea to increase the density of helium gas targets
  • 1. Take out the hydrogen gas target (it is expected to take a few hours)
    2. Cool down the helium gas targets at twelve kelvin for physics runs.
  • The density of the helium gas could be increased by a factor of 3.5 (the thickness of 75 mg/cm² changes to 260 mg/cm²)
  • Dave will summarize the estimations in the proposal.
    → Toshi will consider to change the beam intensity or beamtime to optimize the experiment.

• Raster
  • Raster of 2 × 2 mm² is assumed.
  • It can be 0.5 × 0.5 mm², but the density reduction effect will be larger.

• Density reduction during the beam exposure
  • A 40% reduction may be occurred at 50 uA.
  • The density reduction of 50% is assumed in the current proposal.

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