RC meeting and Run Plan, Wednesday Oct. 17

Status

• Beam Quality Bottom line:
  • Yesterday, accelerator had issues getting a good beam back after RF recovery. They finally settled on 50uA as maximum stable current, and we requested 45uA to limit the SHMS singles rate to below 700kHz in the current setting.
  • Today around noon accelerator went down to fix some more Hall B related issues, as well as do some work on the accelerator.

Requests

• Hall B asked if they could remove halfway plate until Monday
  • We agreed.
• Hall D needs opportunistic 1shift of HallC down for beam studies, not pressing right now (needs to be done before end-of-run)
  • Might be possible when swapping out aerogel trays for the next experiment.
• Greg Smith: Dave Meekins needs access to work on deuterium target for next experiment
  • Called today after I locked Hall back up
  • Told him there will be opportunity when swapping out aerogel on Monday

Plans - Physics

• Run 2-3 more shifts with Q2=5.5. W=3.02 x=0.40 theta_Shms=6.49
  • Currently collected 26% of statistics + Al data in 3.25 shifts
  • Can run up to 45uA in this setting
• Wednesday-Friday: Run 5 shifts with Q2=5.5. W=3.02 x=0.40 theta_Shms=9.56
  • Collect at least 50% of statistics goal
• Friday-Saturday: Run 4-5 shifts with Q2=5.5. W=3.02 x=0.40 theta_Shms=12.56
• Match statistics for the theta_Shms=6.49 point
• FINALLY: 4-6 shift buffer
  • Is this enough buffer?
  • Wishlist of settings to revisit?