Difference between revisions of "RC meeting and Run Plan, Tuesday Oct. 16"

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(→‎Plans - Physics)
(→‎Plans - Physics)
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* '''Friday-Saturday: Run 4-5 shifts''' with Q2=5.5. W=3.02 x=0.40  theta_Shms=12.56
 
* '''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
 
* Match statistics for the theta_Shms=6.49 point
−
* '''FINALLY: 5-6 shift buffer'''
+
* '''FINALLY: 4-6 shift buffer'''
 
** Is this enough buffer?
 
** Is this enough buffer?
 
** Wishlist of settings to revisit?
 
** Wishlist of settings to revisit?
 +
 +
{| class="wikitable" style='text-align: center;'
 +
|-
 +
| '''Tuesday'''
 +
| X
 +
| X
 +
| style='background: #ffffe6; | 6deg.
 +
|-
 +
| '''Wednesday'''
 +
| style='background: #ffffe6; | 6deg.
 +
| style='background: #ffffe6; | 6deg.
 +
|.style='background: #ffebd2' | 9deg.
 +
|-
 +
| '''Thursday'''
 +
| style='background: #ffebd2' | 9deg.
 +
| style='background: #ffebd2' | 9deg.
 +
| style='background: #ffebd2' | 9deg.
 +
|-
 +
| '''Friday'''
 +
| style='background: #ffebd2' | 9deg.
 +
| style='background: #ffeeff' | 12deg.
 +
| style='background: #ffeeff' | 12deg.
 +
|-
 +
| '''Saturday'''
 +
| style='background: #ffeeff' | 12deg.
 +
| style='background: #ffeeff' | 12deg.
 +
| style='background: #f0fff0' | buffer
 +
| '''Saturday'''
 +
| style='background: #f0fff0' | buffer
 +
| style='background: #f0fff0' | buffer
 +
| style='background: #f0fff0' | buffer
 +
| '''Monday'''
 +
| style='background: #f0fff0' | buffer
 +
| X
 +
| X

Revision as of 13:55, 16 October 2018

Status

  • Beam quality: [1] Bottom line:
    • Beam looked great after beam tuning operations up to 55uA
    • Ops still committed to get us the remaining 15uA to go to 70uA
    • Beam was steady for luminosity scan
    • Hopefully things will keep looking good after RF recovery
  • Progress

Activities during opportunistic controlled access

  • Brad and Pavel:
    • Installed NDX detector in SHMS hut (<1hour)
  • Steve Lassiter and Andy Kenyon:
    • (Hopefully) fixed troublesome HMS dipole JT-4 valve.
    • Did maintenance work on HMS and SHMS rotation system.
    • Traced cause of screeching noise when opening HMS shutter to a bent rod.
    • Not a pressing issue but should be fixed eventually before anything else gets damaged.

Issues: Resolved

  • SHMS at small angle
    • Almost done running at 6.49 degrees, didn't encounter issues with the diffusor ion chambers
    • We understand rates enough to avoid DC trips
      • During Luminosity scan found that DC trips start happening around 800-900kHz singles rate
      • At this point, we are either just below, or just above Itrip values for the DC cathodes.
      • Took some data with slightly higher Itrip value (endorsed by Rolf and Mark) during luminosity scan to better understand SHMS performance near the high-rate limit.
        • Reached rates up to ~1MHz

Issues: Requiring attention

Ongoing

  • Still bringing down HMS Dipole LN2 level to below yellow alarm level
    • Maybe increase upper yellow and red alarm levels if we aren't worried about them?

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.

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?
Tuesday X X 6deg.
Wednesday 6deg. 6deg. 9deg.
Thursday 9deg. 9deg. 9deg.
Friday 9deg. 12deg. 12deg.
Saturday 12deg. 12deg. buffer Saturday buffer buffer buffer Monday buffer X X
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