2022 Shutdown - FST Maintenance Log
Note: This note is not in the reversed time order
May 10 2022
- Issue: abnormal current in u207 on MPOD01 and u0 on MPOD03
- Turn on the MPOD crates; check the current on those 2 channels, compared to other channels. u207 on MOD01 is higher than the others; u0 on MPOD03 has significant fluctuation.
- Turn off the MPOD crates; switch the purple cables of the problematic channel with the adjacent ones
- 1-12 (B-6) <-> 1-11 (B-5)
- 3-1 (C-10) <-> 3-2 (C-11)
- Turn on the MPOD crates; check the current again; the issue is now on u205 on MPOD01 and u2 on MPOD03
- Turn off the MPOD crates; switch back the purple cables
- Issue: Temperature of PPB_A-11 is comparatively higher then the others when running
- Turn on the MPOD crates; run DAQ for 10 mins in order to warm up the PPB. Check the temperature of PPB_A-11 and compare to other PPBs every 5 mins. The temperature of PPB_A-11 is about 0.7 °C higher than the others once DAQ is on
- Turn off the MPOD crates; switch the purple cables of the problematic PPB with the adjacent one
- 3-11 (PPB_A-11, 5_2_0_3 ) <-> 3-12 (PPB_A-10, 5_2_1_3)
- Turn on the MPOD crates; check the temperature of PPB_A-11 and PPB_A-10; PPB_A-11 (5_2_0_3) is still higher than PPB_A-10 (5_2_1_3)
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May 11 2022
- Turn off the MPOD crates; disconnect the purple and gray cables on PPB_A
- Organized the spare/broken/empty module boxes in the physics building
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May 16 2022
Disconnect the purple cables on PPB_B and PPB_C
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May 17 2022
Platform built for up coming work
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May 18 2022 - Check Leakage
Some photos of unknown structures on the sensors(3-2,6,7,8):
In comparison to the similar spots on IST:
Some photos of unknown residue (3-1,3):
The FST was already slide out prior to the following operation
- Refill the coolant to ~ 70%
- Turn on the cooling system and let it run for few minutes
- Check as many modules as possible (limited by space)
- Leak
- 3-1 "straight"
- 3-2 "straight"
- 3-3 both
- 3-4 "straight"
- 3-5 both; the straight tube had droplets formed (used towel to absorb and collect; residue visible on the towel)
- 3-11 "bent"
- No Leak
- 1-1
- 1-3
- 1-11
- 2-3
- 2-4
- 2-8
- 2-10
- 2-12
- 3-7
- 3-8
- 3-9
- 3-10
- Leak
- Slightly tighten the screw on 3-5 - "straight"; expect less leakage the next day
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May 19 2022
- Dismount PPB_A-11 from the PPB_A tray
- Double checked the leakage on 3-5 - "straight"; no noticeable leakage on this pipe any more
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May 20 2022
- Test the current on the spare modules (#35 and #77). They perform the same as before (normal noise readout)
- Use the sniffer to double check accessible pipes/connectors
#35
#77
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May 23 2022
- Install the backup PPB to the uninstalled PPB_A tray
- Use the sniffer to double check accessible pipes/connectors
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May 24 2022
- Test the current on the modules with leaking/missing pipes but working sensors (#53, 56, 58 66).
- Use the sniffer to double check accessible pipes/connectors
#53
#56
#58
#66
Inner Outer Comment
#35 0.1 muA 1.2 muA -> 1.7 muA (+20 min) -> 1.9 muA (+10 min) Spare module
#53 0.1 muA 0.2 muA Major leak
#56 0.1 muA 0.2 muA Disconnected connector
#58 0.1 muA 0.1 muA Missing connector
#66 0.1 muA 0.2 muA Disconnected connector
#77 0.6 muA 0.3 muA Spare module
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May 25 2022
- Flemming pointed out that 3-11 had similar grease flowing out although not as significant
- Use the sniffer to double check accessible pipes/connectors
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May 26 2022
Use the sniffer to double check accessible pipes/connectors
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May 27 2022
- Use the sniffer to double check accessible pipes/connectors
- Touch the grease: softened, but not flowing
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May 31 2022
- The FST is pushed back into TPC.
- All cables were reconnected.
- In the epoxy testing, one of the soft tube connections in the testing setup had a leak (not the soft tube connected to the FST module cooling tubes). Greg fixed this leak
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June 1 2022
- Refilled the coolant to 95.1%, leak rate = -0.68% per day
- Ramp up the voltage; 1-12 (outer) tripped; need to manually ramp up slowly and only to 140V instead of 160V
Coolant level vs time (updated on July 5)
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June 2 2022
- Re-organize the cable which was a quick fix during the run
- Re-organize the purple cables and cooling tube so that they are not interfering with the active area and not floating
- Pedestal test demonstration by Xu
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June 3 2022
Pedestal tests
https://drupal.star.bnl.gov/STAR/system/files/fst_pedestals_23154003.pdf
https://drupal.star.bnl.gov/STAR/system/files/fst_totStdDev_23154003.pdf
https://drupal.star.bnl.gov/STAR/system/files/fst_ranStdDev_23154003.pdf
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June 6 2022
Online Monitoring Plots
https://drupal.star.bnl.gov/STAR/system/files/OnlineMonitor.pdf
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June 9 2022
The table is already removed. Cooling tubes at the bottom are re-organized
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Jun 13 2022
1. Another pedestal test before shutting off FST
https://drupal.star.bnl.gov/STAR/system/files/fst_pedestals_23164002.pdf
https://drupal.star.bnl.gov/STAR/system/files/fst_totStdDev_23164002.pdf
https://drupal.star.bnl.gov/STAR/system/files/fst_ranStdDev_23164002.pdf
2. Shut down FST and the cooling system from the online software
3. Shut down the hardware: shut off EMO on the cooling rack, and turn off power supply on all 3 MPOD crates
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Dec 27
1. Refill the coolant to ~50%
2. Turn on the cooling system and MPOD crates; conduct the pedestal tests
The cooling system required a power cycle in order to be turned on
u101 and u207 on MPOD1 tripped with default ramp-up configuration
Rampped up u101 with smaller step
Rampped up u207 with smaller target voltage (100V)
3. Turn off the FST; switch off MPOD crates; turn off the cooling system
4. Turn off the valve in the front face of FST; disconnect cooling tubes; collect remaining NOVEC in the cooling tube
5. Disconnect the purple cables
6. Tape the valve opening, end of cooling tubes to prevent dust; tape the connector of purple cables to prevent damage
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Dec 28
Drain the residual NOVEC in the cooling tube
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Dec 29
The FST is pulled out; re-organize the cables so that they are in a steady and safe place
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