 Tue Nov 10 12:25:29 2020, JM, Cable harnesses 
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The length of the wire needed was estimated with the aid of a scale image of the detectors in the CARME chamber and foam model pieces. Wire length estimated
by simply cutting wire so that it 'fits' the scale model and by taking coordinates of the end points of the longest sections of wire needed on
the model and calculating a bezier curve to estimate wire length. Bezier curve calculated by inputting the endpoints of the wire and control points such |
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Thu Oct 29 08:02:29 2020, CB, JM (remotely), CARME pressure
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Attached is the temperature plot for bakeout period including tags for NEG activation etc.
28 October -> 27 November
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Wed Oct 28 10:41:57 2020, TD, Wednesday 28 October 6x
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10.32
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Mon Oct 26 10:35:05 2020, JM, CB(remotely), Cooling
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10:10 Pressure on the chamber = 3.1e-8mbar. RE-72 temperatures are ~120-125C with set limits at 80C. D2000 temperatures are ~370C. D2000's reduced
from 60W to 30W and all UHV 1400s reduced to 50W each to cool both the chamber and the D2000s so that ion pumps can be activated.
10:38 Pressure on the chamber = 1.7e-9mbar. Re-72 temperatures begining to fall and are currently ~117-122C. D2000 temperatures are ~290C. |
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Thu Oct 22 22:15:00 2020, CB (remotely), Cooling down after first NEG activation 7x
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Thu 22 October
22:15 Temperatures stables, slowly decreasing.
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Thu Oct 22 10:39:40 2020, TD, Thursday 22 October 19x
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10.40
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Mon Oct 19 13:57:52 2020, JM, Neg Activation
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Neg and Neg-Ion pumps have been connected up to the control modules. Controller on the right is connected to the D-2000s. Middle controller is connected
to the wall section negs (1x2negs in series and 1x3negs in series) and the moving detector negs (2x2 negs in series). Left controller is connected
to the intermediate section negs (2x2 negs in series). Must connect IN/OUT interface on the back of the controller or the alarm for an open circuit is |
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Mon Oct 12 10:49:36 2020, JM, First Bakeout of CARME with pumps (cont)
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12 October
10:00 Bakeout temperatures stable. Pressure on the backing line is 3e-7mbar which is the lowest we have achieved on the backing line so far.
Vessel pressure can't be measured at the moment as temperature exceeds the max operational temperature of 80C. |
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Mon Oct 5 08:21:40 2020, CB (remotely), JM, First bake of CARME with pumps (cont.) 6x
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5 OCTOBER
08:21 Temperatures stable overnight. See attached. Baking continues.
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Wed Sep 30 08:10:36 2020, CB (remotely), First bake of CARME with pumps 19x
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(NOTE: Raspberry Pi internal clock appears to be on GMT, rather than GMT+1 due to daylight saving.)
Baking started on Mon 28 Sep. Due to WiFi connection authorisation expiring, no remote access was possible until
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Mon Sep 28 13:04:27 2020, JM, Baking
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I have (fingers crossed) got the baking stepping up nicely now. I have used some of the outer shell to act as a shield and to direct airflow towards
the front and back of the baking volume. I also moved the RE-72 thermocouples to a higher temperature region and replaced the broken thermocouples. The
program is on automatic mode and has currently stepped up to 40C with the max diff reduced to ~4C. |
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Sat Sep 26 09:31:46 2020, JM, CB (both remotely), Baking over weekend
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Sat 26 Sep
09:15 Baking started automatic mode
13:30 Baking continues, heating is slower than expected due to high chamber bottom temperatures |
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Fri Sep 25 12:58:33 2020, JM, Friday 25/09/20
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10:00 Vessel P = 3.99e-8 mbar, RGA P = 1.4e-6 mbar
10:54 Vessel P = 3.89e-8 mbar, RGA P = 1.4e-6 mbar
Vessel continues to pump down. Baking Jacket fully installed and testing of baking begins before leaving on automatic mode for the week. Some |
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Thu Sep 24 10:04:58 2020, JM, TD, Thursday 24 September
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Following overnight pumping by Leybold turbo pump
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Wed Sep 23 13:34:32 2020, JM, TD, Wednesday 23 September
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Connected Leybold Ionivac IE514 to Leybold Combivac CM52 Vacuum Gauge Controller
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Wed Sep 23 13:34:04 2020, JM, Tuesday 22 September
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Turbo-pump Issue approximately 13:00 22/9/20.
While moving the baking octagon into position, the power connector became disconnected from the turbo pump. The pump controller provided the
warnings of connector failure and high pump load (probably due to it reading the frequency of the pump as 0 Hz when disconnected and thinking this was |
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Mon Sep 21 09:51:57 2020, JM, CARME Status
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Cooling of baking volume finished over the weekend, attached are some plots of the bakeout test. Bakeout2.png is the thermocouple profile for the entire
period over the week. The heating in the first seven hours followed a nice linear rise of ~5C/hour, in the 7-40 hour period the heating rate slowed due
to an issue with our octagon average limiting the increase in the temperature. The period from 40-65 hours was due to the picologger heating up to unacceptbly |
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Fri Sep 18 10:28:57 2020, JM, CB(remotely), Baking status
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10:28
Reducing temperature in steps. System cooling down. See attached.
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Thu Sep 17 10:13:43 2020, JM, CB(remotely), Bakeout cooling and pumping of chamber
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The Chamber has continued to pump overnight and we have reached a pressure of 3.3e-6 mbar as of 10:15. Power cable for the hot cathode gauge was found. Gauge
did not give a reading so pin connections were checked, all is okay so it may be thepressure is still too high within the chamber, gauge was thus turned
off. I have attached the RGA from this morning which has increased accuracy so has been cleared up for most of the noise from yesterday. I have begun |
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Wed Sep 16 17:46:36 2020, JM, Pumping of Chamber
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A pump cart and leak cart have been connected to the chamber via the top turbo at the back of the chamber. An air line has also been connected to the
valve to open/close it. The pirani gaige has also been replaced by a blank flange, a gauge on the pump cart can measure the pressure in its range. The
turbo fan and controller were set up and pumping was started after lunch. |