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2011/12/01

1225 @ 80.1K began pumping out N2 exchange gas. Never, ever make the mistake of forgetting to let exhange gas into the IVC when doing LN2 transfer.
1255 79.7K ; turbo pump fully open to IVC. Current IVC pressure: 3E-5 mbar. Looking good.
127 IVC Pressure: 2.2E-6 mbar. Going home!
849 IVC pressure: 8.6E-7 mbar.
1037 Throughput test with leak checker connected to IVC yielded rate of 9.2E-9. No leak there.
Begin blowing out LN2.
1111 Electrical check okay.
Detector: Stripline: 19
SC: 80K
Face: Date 2011-12-01
SQUET: Who RR
Signal Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 1 - 2 k 1.6 OK
SQUID bias B/Ret 2 OK
SQUID bias C/Ret 1.7 OK
SQUID bias D/Ret 1.6 OK
Feedback A/Ret 9 - 13 k 7.3 OK
Feedback B/Ret 8.2 OK
Feedback C/Ret 7.6 OK
Feedback D/Ret 7.1 OK
QET A/Ret 30 - 40 103, 54, 48, 51, 49 OK
QET B/Ret 47, 47, 51, 47 OK
QET C/Ret 45, 45, 34, 44 OK
QET D/Ret 48, 45 ,45 ,45 OK
FET heater +/- 1.0 - 1.1 k 1.044 OK
Qi bias/QET Ret B < 1 nS ok OK
Qo bias/QET Ret B ok OK
Qi feedback/Drain/Source 6 - 8 nS 50MOhm OK
Qo feedback/Drain/Source 50MOhm OK
Qi drain < 0.1 nS – OK
Qo drain – OK
Qi source – OK
Qo source – OK
FET Tsense +/FET heater- 0.9 - 1.0 V 1.09 OK
LED 1 1.2 - 1.5 V 1.42 –
LED 2 1.41 –
Detector: Stripline: 20
SC: LN
Face: Date 2011-12-01
SQUET: Who RR
Signal Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 1 - 2 k 2 OK
SQUID bias B/Ret 1.7 OK
SQUID bias C/Ret 1.8 OK
SQUID bias D/Ret 2.1 OK
Feedback A/Ret 9 - 13 k 15 OK
Feedback B/Ret 9.2 OK
Feedback C/Ret 14.2 OK
Feedback D/Ret 17.4 OK
QET A/Ret 30 - 40 87, 53, 46, 49, 46 OK
QET B/Ret 39, 39, 43, 39 OK
QET C/Ret 41, 41, 33, 41 OK
QET D/Ret 47, 44, 44, 44 OK
FET heater +/- 1.0 - 1.1 k 1.04 OK
Qi bias/QET Ret B < 1 nS OK OK
Qo bias/QET Ret B OK OK
Qi feedback/Drain/Source 6 - 8 nS 50MOhm OK
Qo feedback/Drain/Source 49MOhm OK
Qi drain < 0.1 nS – OK
Qo drain – OK
Qi source – OK
Qo source – OK
FET Tsense +/FET heater- 0.9 - 1.0 V 1.1 OK
LED 1 1.2 - 1.5 V 1.416 –
LED 2 1.408 –
1215 Blowing out of LN2 done.
1216 Leak check done during blow out yielded: 2.1E-8 cc/s. No leak detected!
1222 Filled LN2 cold trap.
1341 Pumping on main bath. Note: it takes < 5 min for pressure on P2 to drop below 1000 mbar.
1510 Filled IVC with 0.12 mbar of He gas.
1523 Began LHe transfer (0%) - dewar pressurized at 1 psi.
1659 IVC pressure 1.6e-2 mbar. Pump out exchange gas at 15K
1713 MC X12004 10.5K. The lowest point was 9.7K. Temperature is still rising. The temperature should be at 4K by an extrapolation from the earlier cooling rate. Increase transfer pressure to 2psi.
1721 He level: -0.7%, start to collect liquid.
1835 End LHe transfer : 93.1% . IVC pressure: 7.4E-7 mbar