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2011/11/11

0210 Fill N2 cold trap full.
Pressure in IVC 1.6E-4 mbar. Good enough to commence nitrogen transfer. Fill IVC with 4.6 mbar N2 exchange gas.
0225 Close condenser line speedivalve and gate valve in preparation for cryocleaning mixture.
Commence nitrogen transfer.
0450 Level meter resistance 1.32 kΩ. Cease nitrogen transfer. Attach ping-pong ball.
0455 Start cryocleaning mixture. Valve 6 open 14.1%.
1520 Tower temperature 81.7 K. Fill N2 cold trap full.
1715 Pump out N2 exchange gas.
1802 Electrical check @ 79K. Everything looks good. Short between QiBias/Gnd and QoBias/Gnd have disappeared.
Detector: G21A DIB1 BH: Stripline: 20
SC: ZB1-4-6 300 K 80K
Face: 5 Date 2011-11-10 Date 2011-11-11
SQUET: ZC70 Who JZ & HC Who HC & RR
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 2 OK
SQUID bias B/Ret 19 34 4.4 OK 1.7 OK
SQUID bias C/Ret 8 24 4.7 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 - 80 106,89,80,83,80 OK 30 - 40 72.7, 51.6, 43.0, 45.9, 43.2 OK
QET B/Ret 35 29, 33, 47, 48 77,77,95,77 OK 38, 37, 55, 38 OK
QET C/Ret 7 5, 9, 10, 28 76,76,69,76 OK 40, 40, 32, 40 OK
QET D/Ret 38 36, 40, 43, 44 85,80,80,80 OK 48, 43, 43, 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 43 MOhm OK 6 - 8 nS 49 Mohm OK
Qo feedback/Drain/Source 30 12, 27 43 MOhm OK 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 1.084 OK
LED 1 chassis 42 1.0 - 1.1 V 1.129 – 1.2 - 1.5 V 1.488 –
LED 2 chassis 26 1.121 – 1.486 –
Detector: G21A DIB2 BH: Stripline: 19
SC: ZB1-4-8 300 K LN
Face: 2 Date 2011-11-10 Date 2011-11-11
SQUET: ZC23 Who JZ & HC Who HC & RR
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 2 OK
SQUID bias B/Ret 19 34 5 OK 1.7 OK
SQUID bias C/Ret 8 24 4.6 OK 1.8 OK
SQUID bias D/Ret 23 39 4.3 OK 2.1 OK
Feedback A/Ret 37 21 15 - 25 k 19 OK 9 - 13 k 15 OK
Feedback B/Ret 2 18 20 OK 9 OK
Feedback C/Ret 41 25 19 OK 14 OK
Feedback D/Ret 22 6 18 OK 17 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 115,94,86,89,87 OK 30 - 40 59, 52, 43, 46, 43 OK
QET B/Ret 35 29, 33, 47, 48 87,86,104,87 OK 38, 38, 41, 38 OK
QET C/Ret 7 5, 9, 10, 28 84,85,74,84 OK 40, 40, 33, 40 OK
QET D/Ret 38 36, 40, 43, 44 89,84,84,84 OK 48, 43, 43, 43 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.04 OK
Qi bias/QET Ret 15 24 - 26 nS Open 39 Mohm (Qi bias) < 1 nS Open OK
Qo bias/QET Ret 11 Open 39 Mohm (Qo bias) Open OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 44 MOhm OK 6 - 8 nS 49 Mohm OK
Qo feedback/Drain/Source 30 12, 27 44 MOhm OK 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 0.723 OK 0.9 - 1.0 V 1.084 OK
LED 1 chassis 42 1.0 - 1.1 V 1.131 – 1.2 - 1.5 V 1.489 –
LED 2 chassis 26 Open – 1.487 –
1905 Begun blow-out of LN2.
2103 Performed throughput test ~ 50 mbar/sec.
2247 Fill IVC with 0.04 mbar He-4 exchange gas.
Begun first LHe transfer (0%)