 Thu Aug 10 07:51:43 2023, JM, Baking tent and heater testing 8x
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09/08/23
Attached is the current pumpdown plot taken from grafana.
I have started to re-work the baking tent in order to close gaps from its initial installation. The heaters work and were tested to a temperature |
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Thu Jul 27 09:43:56 2023, RSS, Thermocouples connected -2
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10:30 IE514 1.80e-08mbar
Most of the CARME is covered by the baking tent. The tent needs to be closed and a bit covered from the front
(upstream), end (downstream), and bottom side. TCs are labeled with a marker in the sequence 1-1 to 2-8.
1-1 Internal TC 1
1-2 Internal TC 2
1-3 Internal TC 3
1-4 CARME front top
1-5 CARME front bottom
1-6 Top hanging middle
1-7 CARME middle |
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Wed Jul 26 08:28:09 2023, RSS, Building tent
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09:26 IE514 1.96e-08mbar |
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Tue Jul 25 09:12:15 2023, RSS, Building tent
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10:10 IE514 2.0e-08mbar
Upstream part of the CARME is covered. |
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Mon Jul 24 10:40:14 2023, RSS, TD, Pump down continues
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11.40 Pirani 1.00e-3 mbar IE514 2.23e-08mbar
15.15 7d/24h vacuum plots |
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Sun Jul 23 10:13:48 2023, RSS, TD, Building tent
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11.15 Pirani 1.0e-03mbar IE514 2.72e-08mbar
16.35 Pirani 1.0e-03mbar IE514 2.61e-08mbar |
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Sat Jul 22 09:19:59 2023, RSS, TD, Thermocouples connected 10x
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10.20 Pirani 1e-03mbar IE514 3.26e-08mbar
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Fri Jul 21 08:21:54 2023, TD, RSS, Baking tent manual
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09.20 Pirani 1.00e-3 mbar IE514 3.90e-8 mbar
Today - install TCs, connect to Pico controller and test
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Thu Jul 20 08:29:26 2023, TD, Installing tent. Two NEG power cable broken. 11x
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09.28 Pirani 1.00e-3 mbar IE514 5.45e-8 mbar
12.10 Bakeout tent frame installed
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Wed Jul 19 08:17:26 2023, TD, Leak testing
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09.16 Pirani 1.00e-3 mbar IE514 8.77e-8 mbar
Leak tester c. 5e-12 mbar.l/s (leak tester valved off)
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Tue Jul 18 08:16:28 2023, TD, Pumping down. Issues found with one detector.
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09.15 Following overnight pumping of CARME chamber by Leybold turbo
Pirani 1.00e-3 mbar IE514 2.83e-7 mbar
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Mon Jul 17 08:45:11 2023, TD, Closing CARME again
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Grosmantage are scheduled to arrive 10.00 to inspect COF600 seals and their fit to the COF600 flange. They may decide to adjust the seals so that they
fit the flange
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Fri Jul 14 08:27:17 2023, TD, CARME open - inspecting seal
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09.20 CARME chamber at atmospheric pressure as expected.
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Thu Jul 13 08:46:44 2023, TD, Replacing wire seal
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09.30 CARME chamber status
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Thu Jul 13 00:12:45 2023, JM, CB, CARME closed
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The CARME chamber was closed and pushed back into position on the ring.
Prior to moving back onto the ring, the detectors were bias tested and the distance between the detectors was also checked using the motors.
Bias test was performed before the detector movement tests and before moving the chamber back onto the ring. |
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Thu Jul 13 00:12:19 2023, JM, CB, Bellow replaced
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The left (inside ring) bellow for the motors rod was replaced.
Replacing the bellow involved;
One person holding the metal plate the detectors are mounted on (cabling remains plugged in) while the operation is performed.
The |
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Thu Jul 6 15:26:39 2023, JM, Leak update
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The leak on the actuator arm bellows has been attempted to be sealed using UHV vacuum seal spray. The spray had the opposite to the desired effect and
the leak rate increased. When spraying with helium the leak rate had increased to 1e-9 mbar l/s. After lunch a second application of the vacuum seal spray
was attempted, however the leak was not sealed. The base leak rate had also increased to the 1e-10 level up from in the morning and yesterday. With the |
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Wed Jul 5 19:27:13 2023, JM, Pump down and leak test
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CARME and the interaction chamber have been pumping for ~26 hours, P=4.15e-7 mbar, attached figures show the current pump down plot in comparison to
the two previous pumpdowns in the last 2 weeks and the pump down with the bare chamber in 2020. The gradient of the pressure reduction appears to be improving
for each pump down, either due to conditioning of the chamber or the reduction in leaks. |
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Tue Jul 4 17:08:08 2023, JM, Leak test and venting
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This morning the pressure achieved was 1.44E-7 mbar. Leak testing showed an overall leak rate of 1.5E-10 mbar l/s, this is below the previous leak rate
but still significantly above the leak rate from elog 141 of the CARME chamber on its own. Spraying helium, a leak is visible on the VAT gate valve on
the interaction chamber (inside of the ring). The leak rate increases to ~2.3E-10 mbar l/s. No increase in the leak rate was observed elsewhere on CARME |
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Mon Jun 26 14:49:05 2023, JM, TD, CARME vented
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26/06/23
This morning the pressure was 4e-7 mbar. The bolts on the windows and the large flange on the bottom of the interaction chamber were tightend.
No leak was present on the windows following tightening. However, the leak on the rotatable flange, although decreased in magnitude, was still in the 1e-9 |