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2011/08/26

0045 Conduct electrical check - no problems.
Detector: G102 DIB1 BH:
SC: ZB1-4-6 300 K
Face: 2 Date 2011-08-26
SQUET: ZC23 Who HC&JZ
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 4.4 OK
SQUID bias B/Ret 19 34 5 OK
SQUID bias C/Ret 8 24 4.6 OK
SQUID bias D/Ret 23 39 4.3 OK
Feedback A/Ret 37 21 15 - 25 k 18 OK
Feedback B/Ret 2 18 20 OK
Feedback C/Ret 41 25 19 OK
Feedback D/Ret 22 6 18 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 85,106,85,86,86 OK
QET B/Ret 35 29, 33, 47, 48 86,85,87,86 OK
QET C/Ret 7 5, 9, 10, 28 88,85,74,84 OK
QET D/Ret 38 36, 40, 43, 44 84,84,84,84 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK
Qi bias/QET Ret 15 24 - 26 nS 38 MOhm OK
Qo bias/QET Ret 11 38 MOhm OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS OL OK
Qo feedback/Drain/Source 30 12, 27 OL OK
Qi drain 16 chassis < 0.1 nS – OK
Qo drain 12 chassis – OK
Qi source 31 chassis – OK
Qo source 27 chassis – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.87 OK
LED 1 42 chassis 1.0 - 1.1 V 1.259 –
LED 2 26 chassis 1.239 –
Detector: G102 DIB2 BH:
SC: ZB1-4-8 300 K
Face: 5 Date 2011-08-26
SQUET: ZC70 Who HC&JZ
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 4.8 OK
SQUID bias B/Ret 19 34 4.4 OK
SQUID bias C/Ret 8 24 4.6 OK
SQUID bias D/Ret 23 39 5.2 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK
Feedback B/Ret 2 18 26 OK
Feedback C/Ret 41 25 28 OK
Feedback D/Ret 22 6 35 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 80,100,79,80,79 OK
QET B/Ret 35 29, 33, 47, 48 76,76,77,76 OK
QET C/Ret 7 5, 9, 10, 28 80,77,69,76 OK
QET D/Ret 38 36, 40, 43, 44 80,80,80,80 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.06 OK
Qi bias/QET Ret 15 24 - 26 nS 38 MOhm OK
Qo bias/QET Ret 11 39 MOhm OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS OL OK
Qo feedback/Drain/Source 30 12, 27 OL OK
Qi drain 16 chassis < 0.1 nS – OK
Qo drain 12 chassis – OK
Qi source 31 chassis – OK
Qo source 27 chassis – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V open OK
LED 1 42 chassis 1.0 - 1.1 V 1.235 –
LED 2 26 chassis 1.218 –
0200 Finish tower installation. Evacuate IVC overnight.
1400 IVC pressure a little high at 1E-4 mbar. Could this be a leak? Connect leak checker.
1715 Conduct leak check. Background helium leak level a little high at 1.9E-8 mbar l/s. Varies between 1.8E-8 and 2E-8 mbar l/s during spray test. Did jump to 2.6E-8 mbar l/s at one point, but it was not possible to recreate this, so it can only be assumed that this is due to a virtual leak.
No gross leak.
1800 Dewar pressure 1.9E-2 mbar. Commence evacuation.
1920 Stop evacuating dewar at pressure 2.5E-3 mbar. Recommence evacuating IVC.
Raise dewar.
2015 Pump and flush dewar with He-4 gas.
Conduct leak check. Background helium leak level 1.2E-8 mbar l/s. Leak rate did not rise above background: no leak.
2025 Evacuate 1 K pot.
2104 Start transfer liquid N2. N2 exchange gas 2.2mbar at RT.
2312 Stop transfer liquid N2.
2340 Fill N2 cold trap full.
Start cryocleaning mixture overnight. Valve 6 open 13.9%.