HYP Target Meeting 20231030

Target Meeting (Hypernuclear experiment at JLab)

• 23:00-24:00 on Oct 29th, 2023 EDT (12:00-13:00 on Oct 30th, 2023 JST)
• Participants: David Meekins (JLab), Toshiyuki Gogami (Kyoto Univ.)
• via ZoomGov

Discussion

HKS-target_meeting_gogami_20231030.pdf

Target list (only solid targets for the next run)

Approved

• E12-15-008: ⁴⁰Ca, ⁴⁸Ca (150 mg/cm²)
  • 40 is easy to obtain, but not for 48.
  • Dave asked Oak Ridge National Lab. to purchase the Ca material.
    → No response yet.
    → Dave will contact the Lab.
• E12-20-013: ²⁰⁸Pb (100-150 mg/cm²)
  • The thickness needs to be fixed for design.
  • Cryogenic system is likely to be needed for cooling.
  • 20 μA would be OK to apply.
• Common calibration: ¹²C (150 mg/cm²), CH₂ (500 mg/cm²), ²⁷Al (150 mg/cm²)

Proposing next year

• LOI12-23-013: ⁶Li, ⁹Be, ¹¹B (100 mg/cm²)
  • A 90%-level of purity is easy to obtain for ⁶Li.
    → The Li material with a better purity is possible to prepare but it costs more.
  • B₄C is easier to obtain than a pure B.
    B₄ would be OK, but the pure B is much better in terms of spectroscopy.
• LOI12-23-016: ²⁷Al (100 mg/cm²)
• LOI12-23-011: there may need special needs.

Some comments

• Solid targets are planned to be used for the next run.
  But, the target system should be compatible with gas targets (E12-19-002) to save total manpower and cost.
• ERR, for example, in Mar is possible for the (solid) target part.
• Requirements for the target (position accuracy etc.) need to be summarized.
• Target camera
  → Beam position adjustment by using a carbon-hole target is more standard nowadays.
• The target group will work on a scattering chamber as well.
• Let's keep using MS Sharepoint for sharing information and documents.

Next Meeting

13:00 p.m.- on Nov 14, 2022 (EDT) at JLab.
→ Meeting for Hypernuclear ERR

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