Difference between revisions of "Run Planning Meeting Notes, December 16 - December 22, 2021"
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| + | =Friday December 17= | ||
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| + | #Last 24h: | ||
| + | #* Smooth production on LD<sub>2</sub> at 140 nA, 0/90 para and perp. Took one amorphous run (90578). | ||
| + | #Issues | ||
| + | #* | ||
| + | #Plans | ||
| + | #* Continue running on LD<sub>2</sub> at 140 nA, 0/90 para and perp until 1:45pm (if empty target run is needed) or 3:45pm (if not). | ||
| + | #* Target change LD<sub>2</sub> → L<sup>4</sup>He: | ||
| + | #** If an empty target run is desirable, start empty the target and turn off pulse refrigerator at 1:45pm (assuming a 2h run). Otherwise, start empty/pulse refr. off at 3:45. | ||
| + | #** 2pm-4pm: 2h empty target run? | ||
| + | #** 4pm. Chris Carlin goes in the Hall to start switching gas. Rapid access. Solenoid is on (be aware of magnetic field fringes). | ||
| + | #** Between 5pm and 6pm: Chris is done switching gas. End of rapid access. | ||
| + | #** Ask for beam. (No need for beam restoration check as the beam down time is small): while the target cools down. A. Somov will take test data. | ||
| + | #* around 9pm: target is cold. Start running on L<sup>4</sup>He at 150 nA, 0/90 para and perp. | ||
| + | |||
=Thursday December 16= | =Thursday December 16= | ||
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#* 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.] | #* 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 the Labview readout 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]. The second time, we fixed it following his instruction and [https://logbooks.jlab.org/entry/3964155 it worked]. | #* Target lost the Labview readout 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]. The second time, we fixed it following his instruction and [https://logbooks.jlab.org/entry/3964155 it worked]. | ||
| − | #* 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]). | + | #* 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]). The comparison between the time-evolution of the Trigger/PS rates for diamond and amorphous radiators shows that the (non-transmission) drop is due to the diamond deterioration rather than detector deterioration. |
#Plans | #Plans | ||
#* Continue running on LD<sub>2</sub> at 140 nA, 0/90 para and perp. Do one amorphous run today. | #* Continue running on LD<sub>2</sub> at 140 nA, 0/90 para and perp. Do one amorphous run today. | ||
#* Discussion on possible target change to L<sup>4</sup>He. | #* Discussion on possible target change to L<sup>4</sup>He. | ||
#* Status of possible CPP test. | #* Status of possible CPP test. | ||
Revision as of 18:52, 16 December 2021
Friday December 17
- Last 24h:
- Smooth production on LD2 at 140 nA, 0/90 para and perp. Took one amorphous run (90578).
- Issues
- Plans
- Continue running on LD2 at 140 nA, 0/90 para and perp until 1:45pm (if empty target run is needed) or 3:45pm (if not).
- Target change LD2 → L4He:
- If an empty target run is desirable, start empty the target and turn off pulse refrigerator at 1:45pm (assuming a 2h run). Otherwise, start empty/pulse refr. off at 3:45.
- 2pm-4pm: 2h empty target run?
- 4pm. Chris Carlin goes in the Hall to start switching gas. Rapid access. Solenoid is on (be aware of magnetic field fringes).
- Between 5pm and 6pm: Chris is done switching gas. End of rapid access.
- Ask for beam. (No need for beam restoration check as the beam down time is small): while the target cools down. A. Somov will take test data.
- around 9pm: target is cold. Start running on L4He at 150 nA, 0/90 para and perp.
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.
- Spectra from A. Somov.
- 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 the Labview readout twice last night (2:20am and 5:50am). Chris Carlin came the first time and fixed it. The second time, we fixed it following his instruction and it worked.
- 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). The comparison between the time-evolution of the Trigger/PS rates for diamond and amorphous radiators shows that the (non-transmission) drop is due to the diamond deterioration rather than detector deterioration.
- Plans
- Continue running on LD2 at 140 nA, 0/90 para and perp. Do one amorphous run today.
- Discussion on possible target change to L4He.
- Status of possible CPP test.
