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2011/06/09

0115 Fill N2 cold trap full.
1046 MC X12004 79.28K, IVC P=2.5mbar. Start pumping out N2 exchange gas.
1054 Pump IVC with leak checker down to 7e-2mbar and then open the turbo pump. He background: 2.5e-9cc/s with pumping station connected.
1226 Open V6 13.8%→14%, there wasn't gas flowing through. G2=460mbar, G1=452.3mbar.
1350 Interrupt cryocleaning. Pump mixture into dump in preparation for throughput test.
1424 Perform electrical check at 77 K.
Detector: G42 DIB1 BH: Stripline: 19
SC: ZB1-1-9 300 K LN
Face: 2 Date 2011-06-07 Date 2011-06-09
SQUET: ZC23 Who HC & JZ Who HC, AK & RWR
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 18 OK 9 - 13 k 7.3 OK
Feedback B/Ret 2 18 20 OK 8.2 OK
Feedback C/Ret 41 25 19 OK 7.6 OK
Feedback D/Ret 22 6 18 OK 7.1 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 84,86,84,85,86 OK 30 - 40 45,58,45,46,46 OK
QET B/Ret 35 29, 33, 47, 48 85,85,88,85 OK 46,45,46,45 OK
QET C/Ret 7 5, 9, 10, 28 85,85,74,84 OK 45,45,34,44 OK
QET D/Ret 38 36, 40, 43, 44 84,83,83,84 OK 45,45,44,45 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.044 OK
Qi bias/QET Ret 15 24 - 26 nS open (A,C,D) 38MOhm (B) OK < 1 nS OK OK
Qo bias/QET Ret 11 open (A,C,D) 39MOhm (B) OK OK OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 44 MOhm, 44 MOhm OK 6 - 8 nS 50MOhm, 50MOhm OK
Qo feedback/Drain/Source 30 12, 27 44 MOhm, 44 MOhm OK 50MOhm, 50MOhm 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 0.724 OK 0.9 - 1.0 V 1.091 OK
LED 1 42 chassis 1.0 - 1.1 V 1.14 – 1.2 - 1.5 V 1.416 –
LED 2 26 chassis 1.129 – 1.406 –
Detector: G42 DIB2 BH: Stripline: 20
SC: ZB1-1-6 300 K LN
Face: 5 Date 2011-06-07 Date 2011-06-09
SQUET: ZC70 Who HC & JZ Who HC, AK & RWR
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 4.8 OK 1 - 2 k 2 OK
SQUID bias B/Ret 19 34 4.4 OK 1.7 OK
SQUID bias C/Ret 8 24 4.6 OK 1.8 OK
SQUID bias D/Ret 23 39 5.2 OK 2.1 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK 9 - 13 k 15 OK
Feedback B/Ret 2 18 25 OK 9.2 OK
Feedback C/Ret 41 25 28 OK 14 OK
Feedback D/Ret 22 6 35 OK 17 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 79,81,79,89,80 OK 30 - 40 44,50,43,44,43 OK
QET B/Ret 35 29, 33, 47, 48 76,75,79,76 OK 38,37,38,38 OK
QET C/Ret 7 5, 9, 10, 28 77,76,69,76 OK 41,41,33,40 OK
QET D/Ret 38 36, 40, 43, 44 80,80,79,80 OK 44,44,43,44 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.06 OK 1.0 - 1.1 k 1.04 OK
Qi bias/QET Ret 15 24 - 26 nS open (A&B), 38 MOhm (C&D) OK < 1 nS OK OK
Qo bias/QET Ret 11 open (A&B), 38 MOhm (C&D) OK OK OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 43 MOhm, 43 MOhm OK 6 - 8 nS 49 MOhm, 49 MOhm OK
Qo feedback/Drain/Source 30 12, 27 44 MOhm, 43 MOhm OK 48 MOhm, 49 MOhm 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 open OK 0.9 - 1.0 V 1.085 OK
LED 1 42 chassis 1.0 - 1.1 V 1.135 – 1.2 - 1.5 V 1.413 –
LED 2 26 chassis 1.126 – 1.405 –
1500 Conduct throughput test: 30 mbar/min. Fine.
Helium leak rate 3.5E-9 mbar l/s: no leak from mixing chamber lines.
1515 Start blowing out nitrogen. Helium leak level 3.5E-9 mbar l/s.
1530 Fill N2 cold trap full.
1610 Nitrogen is out of main bath. Helium leak level 9.4E-9 mbar l/s, no spike: looks good.
Evacuate main bath.
1640 Fill IVC with 16 mbar He-4 exchange gas.
1700 Start first LHe transfer.
1800 Pump out exchange gas.
1940 Stop LHe transfer. Liquid helium level 92.8%.
Start 1 K pot.
1955 Start condensing mixture through nitrogen cold trap 1.
2230 Mixture has mostly condensed. Mixing chamber temperature is a little high at 4.8 K. Still is cold enough to start circulation. Start circulation.