Revision as of 08:25, 16 December 2021

Thursday December 16

Last 24h:
- Smooth production on LD₂ at 140 nA, 0/90 para and perp. Interrupted only by search for better spot on diamond (~1h see below) and ~1h of RF-related down time.
Issues
- JD70-105 degradation: Hovanes tried to find a new location that improved the 0/90 para and 45/135 para/perp coherent peaks, but to no avail.
- Target lost control Labview) twice last night (2:20am and 5:50am). Chris Carlin came the first time and fixed it. He has not responded yet to the second alarm.
- Rates are ~10% lower compared to previous LD₂ data taking period, see here. Part of it is lower transmission but even accounting for this, normalized rates remains 6% lower (see trigger/PS, black disk symbols, here).
Plans
- Continue running on LD₂ at 140 nA, 0/90 para and perp.
- Discussion on possible target change to L⁴He.
- Status of possible CPP test.

@@ Line 5: / Line 5: @@
 #Issues
 #* JD70-105 degradation: [https://logbooks.jlab.org/entry/3963658 Hovanes tried to find a new location that improved the 0/90 para and 45/135 para/perp coherent peaks, but to no avail.]
-#* Target lost control Labview) twice last night ([https://logbooks.jlab.org/entry/3963985 2:20am] and [https://logbooks.jlab.org/entry/3964080 5:50am]). Chris Carlin came the first time and fixed it. He has not responded yet to the second alarm.
+#* Target lost control Labview) twice last night ([https://logbooks.jlab.org/entry/3963985 2:20am] and [https://logbooks.jlab.org/entry/3964080 5:50am]). Chris Carlin came the first time and [https://logbooks.jlab.org/entry/3964024 fixed it]. He has not responded yet to the second alarm.
 #* Rates are ~10% lower compared to previous LD<sub>2</sub> data taking period, see [https://halldweb.jlab.org/wiki/images/a/a3/Rate.png here]. Part of it is lower transmission but even accounting for this, normalized rates remains 6% lower (see trigger/PS, black disk symbols,  [https://halldweb.jlab.org/wiki/images/d/da/Rates_ratios.png here]).
 #Plans