Revision as of 08:40, 3 December 2021

Friday, December 3

Last 24h:
- Tried re-tuning the beam yesterday (reducing MQP5C11). Resulted in lower PS rates (~2.8 kHz) consistent with what was observed previously when we tried this. See: [1],[2]
- After reverting to optics before the change, PS rates back up (~3.3 kHz). See: [3],[4]
- Hovanes performed collimator scan [5]
- Continued C production running overnight.
Issues:
- (not urgent but noted) Hall D staff need access to retrieve CPP equipment in the next week.
- Need to coordinate with Chris and techs the changing of C target sometime next week.
- Mark S. heard a strange repetitive banging sound in the Hall yesterday afternoon. By the time he made the access, it was gone.
Plan:
- run on carbon at 150nA´
- Rotate the radiators and use both configurations
1. - Stop the beam ALWAYS before changing the radiator configuration (even with the same radiator). Between radiator change (0/90 <--> 35/145) ALWAYS ask MCC to insert the dumplette.
- Aligning the peak: Use coarse adjustment to align the distributions (red on blue) and then nudge/fine adjust to line up vertical line fit.
Analysis update

Last 24h:
- Established beam last night before midnight.
- Harp scan extrapolation looks to be focused a bit differently than before. PS rates seemed around 3.2kHz as before with 150nA beam so we kept this.
- Radiation levels at 50nA acceptable.
- Continued production on C target at 150nA. Beam not available for most of Early Riser shift so far.
Issues:
- Rates came back lower [6]
- Tagger magnet came back at slightly lower field [7]. From meeting this morning "DC Power lowered HMax from 290 to 285A and supply cycled fine."
Plan:
- run on carbon at 150nA´
- Rotate the radiators and use both configurations
1. - Stop the beam ALWAYS before changing the radiator configuration (even with the same radiator). Between radiator change (0/90 <--> 35/145) ALWAYS ask MCC to insert the dumplette.
Analysis update

@@ Line 3: / Line 3: @@
 #* Tried re-tuning the beam yesterday (reducing MQP5C11). Resulted in lower PS rates (~2.8 kHz) consistent with what was observed previously when we tried this. See: [https://logbooks.jlab.org/entry/3954868],[https://logbooks.jlab.org/entry/3954875]
 #* After reverting to optics before the change, PS rates back up (~3.3 kHz). See: [https://logbooks.jlab.org/entry/3954921],[https://logbooks.jlab.org/entry/3954933]
-#* Hovanes performed collimator scan []
+#* Hovanes performed collimator scan [https://logbooks.jlab.org/entry/3954941]
-#* Continued production running, XX triggers
+#* Continued C production running overnight.
 #Issues:
 #* (not urgent but noted) Hall D staff need access to retrieve CPP equipment in the next week.
 #* Need to coordinate with Chris and techs the changing of C target sometime next week.
+#* Mark S. heard a strange repetitive banging sound in the Hall yesterday afternoon. By the time he made the access, it was gone.
 # [https://halldweb.jlab.org/wiki/index.php/SRC/CT_Run_Plan Plan:]
 #* run on carbon at 150nA´
 #* Rotate the radiators and use both configurations
 ##* Stop the beam ALWAYS before changing the radiator configuration (even with the same radiator). Between radiator change (0/90 <--> 35/145) ALWAYS ask MCC to insert the dumplette.
+#* Aligning the peak: Use coarse adjustment to align the distributions (red on blue) and then nudge/fine adjust to line up vertical line fit.
 # Analysis update