Difference between revisions of "Run Planning Meeting Notes, Feb 13-Feb 19, 2020"
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== Monday, February 17 == | == Monday, February 17 == | ||
# Last 72 hours | # Last 72 hours | ||
− | #* ... | + | #* smooth running at 350 nA |
+ | #** no emergencies, RC phone has been quiet! | ||
+ | #** beam off for several hours (pass change) on Saturday | ||
+ | #* [https://logbooks.jlab.org/entry/3784369 several monitoring plots with noted differences] | ||
+ | #** example -- [https://logbooks.jlab.org/entry/3785874 Hall-D Monitoring Plots Run 71855] | ||
# Reports | # Reports | ||
#* Potential improvements from realignment of JD70-105 -- Richard Jones | #* Potential improvements from realignment of JD70-105 -- Richard Jones | ||
#** [https://logbooks.jlab.org/entry/3783125 argument for realigning diamond JD70-105] | #** [https://logbooks.jlab.org/entry/3783125 argument for realigning diamond JD70-105] | ||
#* PS / active target / main trigger instabilities -- Alexandre Deur | #* PS / active target / main trigger instabilities -- Alexandre Deur | ||
− | #** [https://logbooks.jlab.org/entry/3785059 another dip in the collimator transmission fraction, amorphous run] | + | #** [https://logbooks.jlab.org/entry/3785059 another dip in the collimator transmission fraction, amorphous run] -- Justin Stevens |
− | #** [https://logbooks.jlab.org/entry/3784415 systematics of PS/tagger ratio variations] | + | #** [https://logbooks.jlab.org/entry/3784415 systematics of PS/tagger ratio variations] -- Richard Jones |
+ | #** [https://logbooks.jlab.org/entry/3785309 high-resolution time plots of active collimator signals] -- Richard Jones | ||
+ | #** [https://logbooks.jlab.org/entry/3785813 Follow-up Re: Rates from PS and main trigger are fluctuating] | ||
+ | #** [https://logbooks.jlab.org/entry/3785887 raster images from active collimator (run 71845)] | ||
+ | == Tuesday, February 18 == | ||
+ | # Last 24 hours | ||
+ | #* Accelerator down from 8:00am for Wein angle change | ||
+ | #* Opportunistic access taken by multiple workers | ||
+ | #* Planned work included survey crew measuring alignment related to test setup (parasitic) upstream of solenoid | ||
+ | #** survey sphere brought too close to magnet, broke free of mount | ||
+ | #** worker could see it where it ended up (upstream BCAL readout), pulled it out | ||
+ | #** bias voltage on that module tripped | ||
+ | #* Detailed report on incident and response -- Tim Whitlatch | ||
+ | #* Present status | ||
+ | #** solenoid ramped down, target emptied | ||
+ | #** Hall D is being swept, preparing to pull back the target | ||
+ | #* Work plan for today -- experts | ||
+ | #** target emptied, being pulled back | ||
+ | #** no emergencies, RC phone has been quiet! | ||
+ | #** beam off for several hours (pass change) on Saturday | ||
+ | # Reports | ||
+ | #* Plan for diamond realignment -- Hovanes | ||
+ | == Wednesday, February 19 == | ||
+ | # Last 24 hours | ||
+ | #* Temporary repairs to BCAL module 26 successful! | ||
+ | #** [https://logbooks.jlab.org/entry/3786599 Temporary workaround in place, Hall D is operational] -- Mark | ||
+ | #* Solenoid ramped up successfully | ||
+ | #** [https://logbooks.jlab.org/entry/3786719 Chimney 4 cold cathode gauge] | ||
+ | #* False alarm on CDC near BCAL module 26 | ||
+ | #* Worked on diamond spot moves, alignment during solenoid ramp -- Hovanes | ||
+ | #** [https://logbooks.jlab.org/entry/3786757 Moved position for JD70-105 45/135] | ||
+ | #** problems with alignment for JD70-106 found and fixed (EPICS variables not defined) | ||
+ | # Reports | ||
+ | #* more on the normalized PS and trigger rates fluctuations | ||
+ | #** [https://logbooks.jlab.org/entry/3786063 PS rate fluctuations in time vs position] -- Hovanes | ||
+ | #** [https://logbooks.jlab.org/entry/3787208 Rates from PS and main trigger continue to fluctuate] -- Alexandre | ||
+ | #** [https://logbooks.jlab.org/entry/3787211 Beam transmission and trigger efficiency] -- Alexandre | ||
+ | #* [https://logbooks.jlab.org/entry/3786561 TOF hit location and Tracking] -- Beni | ||
+ | #* [https://logbooks.jlab.org/entry/3786853 Integrated trigger counter update] -- Alexander |
Latest revision as of 09:43, 19 February 2020
Contents
Thursday, February 13
- Last 24 hours
- Accelerator down 8:00-noon, hall in controlled access
- Beni went into hall to work on CDC boards
- Radcon released failed goni motor from tagger hall, taken for repair
- start counter dark pulse measurements (raw mode random triggers)
- Lubomir adjusted FDC thresholds
- other activities during controlled access...
- Quick-check harp scan at 12:15pm
- Production started at 12:30pm
- 200M evts collected, 46 minutes ABU
- Solenoid trip at 2:30 -- detailed report from experts
- cause of trip -- over-temperature on PS component
- subsequently discovered -- controller communications issue
- solenoid will not ramp, shifts cancelled until 8:00 2/13
- Hall currently in restricted access
- acid flush of PS cooling loop underway, finished by noon
- after that, diagnosis and repair of PS controller
- if all goes well, should be able to start ramp by 5:00pm
- Accelerator down 8:00-noon, hall in controlled access
- Reports
Friday, February 14
- Last 24 hours
- 8:00-noon, hall in controlled access
- acid flush of solenoid PS cooling loop
- work on PS controls started around noon
- work-around found for electronics issue
- hall restored to beam permit at 15:00
- solenoid current ramp started at 14:30
- 0 - 800A, wait
- 800 - 1000A, wait
- 1000 - 1200A, wait
- 1200 - 1360A, wait
- 1360 - 1350A, then go!
- ramp completed around 22:30
- Production resumed at 22:30pm
- Meanwhile, attempt at high-intensity accidentals test
- all detector systems turned off except: PS/PSC, TPOL, TAGM
- JD70-106 radiator, 2.1 uA
- beam was very unstable, attempts to understand it
- no change in gain setting of active collimator was needed
- we think that BPMs were saturating at 2.1 uA, driving the locks awry
- accel turned off the locks at 250nA, then ramped up to 2.1uA
- no coherent edge was visible in TAGM at any of the 4 settings (0/90 and 45/135 PARA/PERP)
- spent considerable time doing nudges, no change in TAGM spectrum
- finally, decided just to take data at 2.1uA
- one run, maybe 5 minutes of 2.1uA beam over ~1 hour period
- alignment of JD70-106 is a mystery -- what were we doing wrong?
- 8:00-noon, hall in controlled access
- Reports
- PS / active target / main trigger instabilities -- Alexandre Deur
Monday, February 17
- Last 72 hours
- smooth running at 350 nA
- no emergencies, RC phone has been quiet!
- beam off for several hours (pass change) on Saturday
- several monitoring plots with noted differences
- example -- Hall-D Monitoring Plots Run 71855
- smooth running at 350 nA
- Reports
- Potential improvements from realignment of JD70-105 -- Richard Jones
- PS / active target / main trigger instabilities -- Alexandre Deur
- another dip in the collimator transmission fraction, amorphous run -- Justin Stevens
- systematics of PS/tagger ratio variations -- Richard Jones
- high-resolution time plots of active collimator signals -- Richard Jones
- Follow-up Re: Rates from PS and main trigger are fluctuating
- raster images from active collimator (run 71845)
Tuesday, February 18
- Last 24 hours
- Accelerator down from 8:00am for Wein angle change
- Opportunistic access taken by multiple workers
- Planned work included survey crew measuring alignment related to test setup (parasitic) upstream of solenoid
- survey sphere brought too close to magnet, broke free of mount
- worker could see it where it ended up (upstream BCAL readout), pulled it out
- bias voltage on that module tripped
- Detailed report on incident and response -- Tim Whitlatch
- Present status
- solenoid ramped down, target emptied
- Hall D is being swept, preparing to pull back the target
- Work plan for today -- experts
- target emptied, being pulled back
- no emergencies, RC phone has been quiet!
- beam off for several hours (pass change) on Saturday
- Reports
- Plan for diamond realignment -- Hovanes
Wednesday, February 19
- Last 24 hours
- Temporary repairs to BCAL module 26 successful!
- Solenoid ramped up successfully
- False alarm on CDC near BCAL module 26
- Worked on diamond spot moves, alignment during solenoid ramp -- Hovanes
- Moved position for JD70-105 45/135
- problems with alignment for JD70-106 found and fixed (EPICS variables not defined)
- Reports
- more on the normalized PS and trigger rates fluctuations
- PS rate fluctuations in time vs position -- Hovanes
- Rates from PS and main trigger continue to fluctuate -- Alexandre
- Beam transmission and trigger efficiency -- Alexandre
- TOF hit location and Tracking -- Beni
- Integrated trigger counter update -- Alexander
- more on the normalized PS and trigger rates fluctuations