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

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* ''' [https://hallcweb.jlab.org/wiki/index.php/Kaon_LT_Status_Page Progress]'''
 
* ''' [https://hallcweb.jlab.org/wiki/index.php/Kaon_LT_Status_Page Progress]'''
 
** Finished [[Run Plan for Kaon LT Luminosity Scan | luminosity scan]] with flying colors!
 
** Finished [[Run Plan for Kaon LT Luminosity Scan | luminosity scan]] with flying colors!
−
 
  
 
== Activities during opportunistic controlled access ==
 
== Activities during opportunistic controlled access ==
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** Maybe increase upper yellow and red alarm levels if we aren't worried about them?
 
** Maybe increase upper yellow and red alarm levels if we aren't worried about them?
  
−
== Request (non-urgent) ==
+
== 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)
 
* '''Hall D''' needs opportunistic 1shift of HallC down for beam studies, not pressing right now (needs to be done before end-of-run)
−
** Told them this might be possible when swapping out aerogel trays for the next experiment.
+
** Might be possible when swapping out aerogel trays for the next experiment.
−
** Next RC is aware.
+
  
 
== Plans - Physics ==
 
== Plans - Physics ==
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* Conduct for 1-2 shifts for luminosity scan starting this swing shift
+
* '''Run 2-3 more shifts''' with  Q2=5.5. W=3.02 x=0.40  theta_Shms=6.49
−
** '''[[Run Plan for Kaon LT Luminosity Scan|Tentative run plan]]'''
+
** Currently collected 26% of statistics + Al data in 3.25 shifts
−
** Ryan agreed to help as third during swing, and Richard will help as third during owl if needed
+
** Can run up to 45uA in this setting
−
* Expect another downtime tomorrow during day for RF recovery
+
* '''Wednesday-Thursday: Run 5 shifts''' with Q2=5.5. W=3.02 x=0.40  theta_Shms=9.56
−
* '''Run 2-3 more shifts''' with  Q2=5.5. W=3.02 x=0.40  theta_Shms=6.49 (real shifts, excluding scheduled downtime)
+
** Collect at least 50% of statistics goal
−
** Currently collected 23% of statistics + Al data in 3 shifts
+
* '''Friday-Saturday: Run 4-5 shifts''' with Q2=5.5. W=3.02 x=0.40  theta_Shms=12.56
−
** Switch sometime between Tuesday and Wednesday to the next point
+
* Match statistics for the theta_Shms=6.49 point
 +
* '''FINALLY: 5-6 shift buffer'''
 +
** Is this enough buffer?
 +
** Wishlist of settings to revisit?

Revision as of 13:46, 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-Thursday: 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: 5-6 shift buffer
    • Is this enough buffer?
    • Wishlist of settings to revisit?
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