Run Planning Meeting Notes, Apr12-Apr 18, 2018
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Contents
Thursday, April 12 at 08:45
- Notes from the previous 24 hours:
- TAC run (evening strip chart) was finished around 10pm. Took data with both the 750um and 75um converter.
- Production started around 11 pm and has continued through the night.
- Issues:
- When adjusting a procedure, please contact the expert before doing so to make sure the changes you make are okay.
- ~1hr 20 mins of DAQ issues while the target was filling and we could not run in raw mode.
- PS scalers (Alexandre)
- Reports:
- Correlation between beam Y position and CDC HV current (Beni)
- Attenuation lengths (Lubomir)
- PS acceptance from TAC run with 1/3 of data (Sasha)
- Low Level Monitoring Report (Thomas)
- Run Plan
- Pass change this morning
- Short access to install copper and tungsten shields
- Move muon chamber back into beam line
- Production running
- Harp scan when beam comes back
- Fast raster scan postponed to Monday
- Any more systematic studies we want to do?
- Pass change this morning
- AOB
Friday, April 13 at 08:45
- Notes from the previous 24 hours:
- No beam until 4pm
- Finished materials scan at 5:35pm
- Finished raw mode run
- Bill broke the 7hr mark for ABU during his shift- first time a hall has done that this spring
- Muon chamber installed with the steel bar
- New radiator on GEM TRD
- Shields installed on profiler
- Issues:
- Bill noticed some minor inconsistencies with monitoring plots (beta vs. p, beam energy, and trigger bit)
- Reports:
- Harp scan (Hovanes)
- Materials scan (Lubomir)
- Low level monitoring (Thomas)
- Run Plan
- Todd wants to try a low current lock on the active collimator at ~1pm
- Trigger studies (~2hr)
- Hovanes and Sasha need to test V wire and lock on active collimater (~10 minutes)
- Production and switching to the thin diamond next week
- AOB
- Have Lubomir for opportunistic access to remove Cu and half of W shield- any others? Beam studies on Monday and RF recovery Tuesday
- Run meeting this weekend?
Saturday, April 14 at 08:45
No meeting
Sunday, April 15 at 08:45
No meeting
Monday, April 16 at 08:45
- Notes from the previous 48 hours:
- Accelerator ran OK this weekend- downtime events every shift
- Low current AC test delayed due to voltage adapter problem. Tentative postponement until Wednesday?
- Issues:
- Low yield of physics signals (Mark D.)
- Newly inefficient PS channel (Dave)
- Trouble putting rootspy histograms in logbook (Mark I.)
- We will not tolerate identity theft
- Transmission last night (Beni)
- Reports
- New preamp (and calibration) fixes noisy CDC channels (Naomi)
- [1], [2], (Revised entry) Figure of merit vs. virtual electron spot size (Justin)
- Sunday's harp scan (Hovanes)
- PS baselines adjusted (Sasha)
- Low level monitoring (Thomas)
- Run Plan
- 8hr beam studies today
- Controlled access to adjust shielding, replace AC voltage adapter, FCAL bases, and other technician work
- Finish materials scan
- Production this evening
- RF recovery tomorrow
- Switch AC to 3.5 mm collimator
- Take data through Thurs. with this setting: 150 nA, 75 micron converter, 0/90, AMO
- proper beam tuning?
- Switch AC to 3.5 mm collimator
- Best time to try to try the low current lock on the AC for the next TAC run? Tentatively postponed until Wed. before raster tests
- 8hr beam studies today
- AOB
Tuesday, April 17 at 08:45
- Notes from the previous 48 hours:
- Reinstalled 50 micron W and removed Cu shields
- Active collimator voltage adapters repaired
- 9 FCAL bases replaced
- Sean let me know he was checking on calibrations
- Trickles of beam at 6 pm
- Issues:
- Reports
- Materials Scan (Lubomir)
- Harp scan (Hovanes)
- Low level monitoring (Thomas)
- Run Plan
- RF Recovery
- Switch AC to 3.5 mm collimator
- Settings to run at from beam line group? Last I heard was 75 um converter, ~300nA (normalize DAQ rates), 0/90 PARA/PERP x2, AMO x2
- Talked to Todd about a performing a beam convergence. Will be available all day tomorrow
- Reinstall shielding
- Switch AC to 3.5 mm collimator
- RF Recovery
- AOB
Wednesday, April 18 at 08:45
- Notes from the previous 48 hours:
- Moved AC to 3.5 mm collimator
- RF recovery took longer than expected
- Last night once we got beam back, it was seen that we could not lock on the AC. We went into controlled access and have a radcon escort into the collimator cave so Alex B. could fix AC. He first thought it was the traditional voltage adapter problem, but it turned out to be a cable issue.
- Issues:
- Cable issue on AC (Alex B.)
- Another issue with the AC lock: Notice that the Active Collimator (AC) lock is not on. MCC tells us that the AC is showing an invalid status and cannot be used for beam locking.
- Hovanes was not aware that we were going to try this diamond tonight. He releases the interlock that was preventing the AC lock. He is concerned that the optimal AC position lock for the 3.4 mm collimator may not be the same as that for the 5 mm collimator.
- Beam position was checked with the gamma profiler, even though there is no radiator plate attached. Rates look OK.
- At 500 nA, rates in the tagger hodoscope for photons below the coherent peak are at 2.0 to 2.5 MHz. At this point, unable to change the collimator easily and with no procedure to optimize lock position, we decide to go ahead with the program, trusting that the AC lock is roughly centers the beam on the 3.4 mm collimator.
- Coffee maker broken (Mark I.)
- Noisy CDC channel
- Reports
- Electron beam energy monitoring (Alexandre)
- 1, 2 (Sean)
- BCAL Z position calibration, run dependence(Mark D.)
- Run conditions at 3.4 mm collimator (Sasha)
- Run Plan
- Running with thin diamond
- With Sasha on shift last night, it was decided to run by normalizing to PS rates
- Beam tune, fast raster scan, and low current AC lock test
- Running with thin diamond
- AOB
- Mark D. takes over as RC