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2011/03/13

1745 Fill N2 cold trap full.
Mixing chamber temperature 78.6 K, falling gradually. Probably alright to pump out N2 exchange gas, but have other jobs to do so no harm in delaying it.
1830 Tower temperature 78.3 K. Pump out N2 exchange gas.
1920 Conduct electrical check at 77 K.
Detector: G101 DIB1 BH: Stripline: 19
SC: ZB1-1-9 300 K LN
Face: 5 Date 2011-03-12 Date 2011-03-13
SQUET: ZC23 Who HC & JZ Who JZ & HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead)
Nominal: Nominal:
< 0.1 nS < 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 4.4 OK 1 - 2 k 1.6 OK
SQUID bias B/Ret 19 34 5 OK 2 OK
SQUID bias C/Ret 8 24 4.6 OK 1.7 OK
SQUID bias D/Ret 23 39 4.3 OK 1.6 OK
Feedback A/Ret 37 21 15 - 25 k 19 OK 9 - 13 k 7.3 OK
Feedback B/Ret 2 18 21 OK 8.2 OK
Feedback C/Ret 41 25 19 OK 7.6 OK
Feedback D/Ret 22 6 18 OK 7 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 94,87,85,86,86 OK 30 - 40 50,45,43,44,44 OK
QET B/Ret 35 29, 33, 47, 48 92,92,100,92 OK 44,44,47,44 OK
QET C/Ret 7 5, 9, 10, 28 87,85,74,84 OK 45,44,33,44 OK
QET D/Ret 38 36, 40, 43, 44 85,84,84,84 OK 44,44,43,44 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.043 OK
Qi bias/QET Ret 15 24 - 26 nS 26 (PA), open (PB, PC, PD) OK < 1 nS >50M, OL OK
Qo bias/QET Ret 11 26 (PA), open (PB, PC, PD) OK >50M, OL OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23 OK 6 - 8 nS 20 OK
Qo feedback/Drain/Source 30 12, 27 23 OK 20 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – OK
Qo drain 12 chassis – OK – OK
Qi source 31 chassis – OK – OK
Qo source 27 chassis – OK – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.721 OK 0.9 - 1.0 V 1.04 OK
LED 1 42 chassis 1.0 - 1.1 V 1.137 – 1.2 - 1.5 V 1.418 –
LED 2 26 chassis open – open –
Detector: G101 DIB2 BH: Stripline: 20
SC: ZB1-1-6 300 K LN
Face: 2 Date 2011-03-12 Date 2011-03-13
SQUET: ZC70 Who HC & JZ Who JZ & HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead)
Nominal: Nominal:
< 0.1 nS < 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 4.9 OK 1 - 2 k 1.9 OK
SQUID bias B/Ret 19 34 4.4 OK 1.6 OK
SQUID bias C/Ret 8 24 4.7 OK 1.8 OK
SQUID bias D/Ret 23 39 5.3 OK 2.1 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK 9 - 13 k 15 OK
Feedback B/Ret 2 18 26 OK 9 OK
Feedback C/Ret 41 25 29 OK 14 OK
Feedback D/Ret 22 6 35 OK 17 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 89,82,80,80,80 OK 30 - 40 50,44,42,43,42 OK
QET B/Ret 35 29, 33, 47, 48 83,82,90,83 OK 37,36,41,36 OK
QET C/Ret 7 5, 9, 10, 28 79,77,69,76 OK 41,40,32,40 OK
QET D/Ret 38 36, 40, 43, 44 81,80,80,80 OK 43,43,42,43 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.061 OK 1.0 - 1.1 k 1.04 OK
Qi bias/QET Ret 15 24 - 26 nS open OK < 1 nS open OK
Qo bias/QET Ret 11 open OK open OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK 6 - 8 nS 20,20 OK
Qo feedback/Drain/Source 30 12, 27 23,23 OK 20,20 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – OK
Qo drain 12 chassis – OK – OK
Qi source 31 chassis – OK – OK
Qo source 27 chassis – OK – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.706 OK 0.9 - 1.0 V 1.082 OK
LED 1 42 chassis 1.0 - 1.1 V 1.129 – 1.2 - 1.5 V 1.412 –
LED 2 26 chassis 1.121 – 1.405 –
1835 IVC: 40mbar, MC X12004: 78.3K. Start to pump out N2 exchange gas.
1908 Finished electrical check: OK
1911 IVC: 1.9e-3 mbar. Isolate pumping station, He BG ~3e-9 cc/s. Connect pumping station and keep pumping.
1955 Pump mixture into dump to conduct throughput test.
2040 Open gate valve, condenser speedivalve.
2043 Conduct throughput test: 15 mbar/min. No leak from circulation line. Pump mixture into dump to try again.
2047 Pump mixture into dump.
2107 Conduct another throughput test: 12 mbar/min. Pump mixture into dump again.
P1 easily goes down to 0.007 mbar. There might be a partial blockage in the circulation line.
2124 Close gate and condenser line speedivalves.
2140 Start cryocleaning mixture again. Valve 6 open 25.7%: quite high, but necessary to get a good flow rate. Why?
2144 Open valve 6 to 25.8%.
2158 Open valve 6 to 25.9%. Can see frost on N2 cold trap outlet: maybe too fast.
2303 Pump mixture into dump.
2345 Conduct throughput test: 19 mbar/min. There is probably a blockage. Might need to warm up fridge. Pump mixture into dump.