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

Revision as of 13:31, 16 October 2018

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
- Finished luminosity scan with flying colors!

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.

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

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?

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.
- Next RC is aware.

Conduct for 1-2 shifts for luminosity scan starting this swing shift
- Tentative run plan
- Ryan agreed to help as third during swing, and Richard will help as third during owl if needed
Expect another downtime tomorrow during day for RF recovery
Run 2-3 more shifts with Q2=5.5. W=3.02 x=0.40 theta_Shms=6.49 (real shifts, excluding scheduled downtime)
- Currently collected 23% of statistics + Al data in 3 shifts
- Switch sometime between Tuesday and Wednesday to the next point

@@ Line 6: / Line 6: @@
 ** Hopefully things will keep looking good after RF recovery
 * ''' [https://hallcweb.jlab.org/wiki/index.php/Kaon_LT_Status_Page Progress]'''
-** Finished [[https://hallcweb.jlab.org/wiki/index.php/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!