Difference between revisions of "Run Planning Meeting Notes, January 19 - January 25, 2023"
From GlueXWiki
m |
(→Plans) |
||
| Line 38: | Line 38: | ||
**Run 2h on 1.12E-4 RL amo radiator on radiator ladder (250 nA). | **Run 2h on 1.12E-4 RL amo radiator on radiator ladder (250 nA). | ||
**Run (until the beam is taken away in the morning) on 3.4E-4 RL amo radiator on radiator ladder (250 nA). | **Run (until the beam is taken away in the morning) on 3.4E-4 RL amo radiator on radiator ladder (250 nA). | ||
| − | * Beam off starting Friday morning around 7:30am [https://logbooks.jlab.org/entry/4113148 to fix vacuum issue in south linac], until 4pm(?). | + | * Beam off starting Friday morning around 7:30am [https://logbooks.jlab.org/entry/4113148 to fix vacuum issue in south linac], until 4pm(?). |
| + | *When the beam comes back: | ||
| + | **Harp scans | ||
| + | **BCM comparison (~15min, invasive to other halls). PD (Joe Grames) recommends comparing (not calibrating) the Hall D MPS BCM against the injector Faraday Cup #2: To do this: | ||
| + | ***Turn off beam to other halls | ||
| + | ***Close chopping aperture to other halls | ||
| + | ***Send beam to FC#2, use an upstream corrector to convince oneself it is centered (max current) | ||
| + | ***Send current to FC#2 (record it), then pull cup and go to Hall D (record it). Repeat for several current values: 0, 50, 100, 150, 200, 250, 300, 350, 400 and 450 nA. | ||
| + | ***Restore the upstream corrector | ||
| + | **Production on goni amo radiator at 300 nA until Sunday morning. | ||
* Hall access: | * Hall access: | ||
**Sergey F. | **Sergey F. | ||
| − | * Diamond alignment: | + | * Diamond alignment: Sunday morning, ~9am. |
* Until then production on amorphous. | * Until then production on amorphous. | ||
* [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Spring2023#Runplan Link to runplan] | * [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Spring2023#Runplan Link to runplan] | ||
Revision as of 12:13, 20 January 2023
Contents
Friday January 20
Past 24 hours
- Ran on amorphous radiator (250 nA) until 10am. Then, beam was taken away for RF work (high current push for Halls A and C). Beam came back around 5:30pm. We did harp scans, a BCM/FCup calibration, and then ran on various amorphous radiators during the night and early morning. ABU= 11.5h for the day
- Several accesses done during the day:
- Sasha (FADC replacement for TOF)
- Sergey
Shift Reports
Reports
- Harp scans. Sigma_y is too wide=> too wide photon beam spot (magenta). Okay for now (unpolarized beam)?
- TOF calibration (Beni), FADC replacement for TOF (A. Somov)
- Difference in Shape of Reconstructed photon beam energy with different AMO radiators (Churamani Paudel)
Issues
- Beam energy oscillation investigation (M. Tiefenback). Summary: Mike T. suspects the oscilations are not real but he is asking confirmation/advice from the system experts.
- Tim W. reminder on acknowledging alarms
- HVB currents look high and follow-up (Naomi)
- 30% increase in rates compared to Summer 2020 run period.
- Original finding by A. Somov
- Comparison of 2020 and 2023 for TAGH rates (A. Deur)
- Check that TAGH counters scale with (A. Deur)
- rho and pi0 yields (A. Austregesilo)
- BCM/FCup calibration suggested by the PD, its results and follow-up.
- the rate discrepancy after BCM/FCup calibration has been reduced by half (A. Deur)
- Ran overnight on different amo radiators
Plans
- Thursday evening and Friday night:
- Once beam come back, do Harp scans.
- FCup test of our beam dump BCM.
- Run 1h on the amo radiator of the goni (baseline for next runs below). 250 nA
- Run 2h on 0.19E-4 RL amo radiator on radiator ladder (250 nA).
- Run 2h on 1.12E-4 RL amo radiator on radiator ladder (250 nA).
- Run (until the beam is taken away in the morning) on 3.4E-4 RL amo radiator on radiator ladder (250 nA).
- Beam off starting Friday morning around 7:30am to fix vacuum issue in south linac, until 4pm(?).
- When the beam comes back:
- Harp scans
- BCM comparison (~15min, invasive to other halls). PD (Joe Grames) recommends comparing (not calibrating) the Hall D MPS BCM against the injector Faraday Cup #2: To do this:
- Turn off beam to other halls
- Close chopping aperture to other halls
- Send beam to FC#2, use an upstream corrector to convince oneself it is centered (max current)
- Send current to FC#2 (record it), then pull cup and go to Hall D (record it). Repeat for several current values: 0, 50, 100, 150, 200, 250, 300, 350, 400 and 450 nA.
- Restore the upstream corrector
- Production on goni amo radiator at 300 nA until Sunday morning.
- Hall access:
- Sergey F.
- Diamond alignment: Sunday morning, ~9am.
- Until then production on amorphous.
- Link to runplan
Thursday January 19
Past 24 hours
- Ran on empty target until 7:20am. Then, beam was taken away for beam and RF study and acceptable beam came back only Thursday at 1:10am. ABU= 4h for the day
- refilled the target around 4:15pm.
- Several accesses done during the day:
- Scot
- Sergey
- David Lawrence
- Cody
- Took amorphous data, starting around 1:10am after aborted attempt to check diamond alignment.
Shift Reports
Reports
- Harp scans (just our harp)
- Hovanes attempted to start diamond alignment between 10:50pm-1am. Not able to start due to lack of good beam.
Issues
- TOF rate issues (Beni)
- beam energy oscillation
- 30% increase in transmission compared to Summer 2020 run.
Plans
- Beam off starting around 10am for RF study, nominally until 4pm+/-4h.
- Hall in controlled access?
- Diamond alignment: Friday day ? (Hovanes unavailable today)
- Until Friday day, production on amorphous?
- Link to runplan
