RC meeting and Run Plan, Thursday Oct. 11

• Status
  • Beam quality [1]
    • Bottom line: terrible 24 hours
    • Maximum stable current at 50uA
  • Data taken so far [2]
    • Added 18% of the minimum statistics on LH2 for the current run
    • Did the complete dummy run

• Requiring attention
  • HMS Dipole LN2 fill level very high (essentially full) [3]
    • Not urgent, small ice ball forming in non-critical location (we're watching it)
    • Cause: seems like JT-4 is stuck again
    • Will coordinate with Andy Kenyon early next week for opportunistic escorted access
  • Complications when going to 6.50 deg tonight:
    • Risk tripping the rotation alarm: Holly on standby
    • Need new limits on ion chamber diffusors if we run above >=50uA (Jay Benesh confirmed this is the case), more info here: [4].
    • SHMS rates expected to be close to detector limit (tracking efficiency), might need to limit beam current. Would take care of above issue. Current estimate from Garth puts us at <55uA.

• Other requests (non-urgent)
  • (copied from yesterday): RadCon wants to put a small detector in the SHMS hut during the next opportunity
    • Needs few hours, communicate with Brad when next opportunity arrises
  • Hall D needs opportunistic 1shift of HallC down for beam studies, not pressing right now (needs to be done before end-of-run)
    • Unlikely this will happen in the next week

• Plans - Physics
  • Continue taking date at Q2=3. W=3.14 x=0.25 theta_Shms=9.42 until ~midnight, hopefully will reach 50-60% of statistics goal
  • Change SHMS angle to 6.50 deg (close to software minimum) for next kinematic point.
    • Aim for 55% of minimum statistics (same as 12 degree point)
    • Expect to stay there for ~5-7 shifts.