Revision as of 22:40, 8 September 2022

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Friday, September 9

Production data at 200nA on the liquid He target.
FCAL HV Scan with solenoid field on
Trigger studies and rate scan performed by Sasha
- Added low-threshold trigger for FCAL (0.5GeV Trigger threshold)
- 2 noisy FCAL channels were masked
Beam stability on the active collimator (Beni)
Shift summaries:
- 0400-1000 09/09
- 2200-0400 08/09-09/09
- 1600-2200 08/09
- 1000-1600 08/09
- 0400-1000 08/09

Beam was unavailable for about 1 hour during the day shift due to Hall C's BCM calibration. We correlated the FCAL HV scan with this downtime.
Minor issue with one shift worker not showing up. Thanks to Karthik for taking that role on short notice.

Maintenance day
Work done in hall:
- Removed Be target, Installed He target and ramped magnet:
- Fixed connection for missing channels in ST:
- Replaced FCAL bases & one PMT (Malte): [1], [2]
LHe Target full and ready after ~11 hours, [3] (Chris Carlin)
Extrapolations from harp scans
FCAL HV Correction for outliers (Igal)
308M Triggers collected while target was filling and solenoid ramping.
404M Triggers collected with target full and solenoid ramped.
More details can be found here

FDC-RF selftiming peak is missing
- Hall C will do BCM calibrations this afternoon, coordinate access to fix FDC TDCs with this?

Rate+Trigger Studies (Sasha)
- Trigger rate studies on Beryllium
- Trigger rate scan (Be)
Begin(continue) production on LHe Target @200nA
Wednesday, 9/14: MCC plans to open the tunnel with the goal to bring up as much RF as possible. They plan to spend ~1.5 shifts for this.

@@ Line 25: / Line 25: @@
 === Issues ===
+*Beam was unavailable for about 1 hour during the day shift due to [https://logbooks.jlab.org/entry/4039197 Hall C's BCM calibration]. We correlated the FCAL HV scan with this downtime.
 *Minor issue with one shift worker not showing up. Thanks to Karthik for taking that role on short notice.