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2011/03/12

0330 Conduct electrical check at 300 K.
Qo feedback shorted to ground on DIB1, SQUET card ZC-23, stripline 19. Unplugged and replugged stripline. That did the trick: maybe pin 23 missed its socket.
Detector: G101 DIB1 Stripline: 19
SC: ZB1-1-9 300 K
Face: 5 Date 2011-03-12
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 19 OK
Feedback B/Ret 2 18 21 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 94,87,85,86,86 OK
QET B/Ret 35 29, 33, 47, 48 92,92,100,92 OK
QET C/Ret 7 5, 9, 10, 28 87,85,74,84 OK
QET D/Ret 38 36, 40, 43, 44 85,84,84,84 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK
Qi bias/QET Ret 15 24 - 26 nS 26 (PA), open (PB, PC, PD) OK
Qo bias/QET Ret 11 26 (PA), open (PB, PC, PD) OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23 OK
Qo feedback/Drain/Source 30 12, 27 23 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 0.721 OK
LED 1 42 chassis 1.0 - 1.1 V 1.137 –
LED 2 26 chassis open –
Detector: G101 DIB2 Stripline: 20
SC: ZB1-1-6 300 K
Face: 2 Date 2011-03-12
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 4.9 OK
SQUID bias B/Ret 19 34 4.4 OK
SQUID bias C/Ret 8 24 4.7 OK
SQUID bias D/Ret 23 39 5.3 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK
Feedback B/Ret 2 18 26 OK
Feedback C/Ret 41 25 29 OK
Feedback D/Ret 22 6 35 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 89,82,80,80,80 OK
QET B/Ret 35 29, 33, 47, 48 83,82,90,83 OK
QET C/Ret 7 5, 9, 10, 28 79,77,69,76 OK
QET D/Ret 38 36, 40, 43, 44 81,80,80,80 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.061 OK
Qi bias/QET Ret 15 24 - 26 nS open OK
Qo bias/QET Ret 11 open OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK
Qo feedback/Drain/Source 30 12, 27 23,23 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 0.706 OK
LED 1 42 chassis 1.0 - 1.1 V 1.129 –
LED 2 26 chassis 1.121 –
0500 Seal up IVC and evacuate.
1506 Isolate pumping station. IVC He background 3.5E-9cc/s.
1712 Isolate pumping station at 4e-5mbar. He background 3.3e-9cc/s
1732 No gross leak found
check the resistances of the detector, everything fine.
2045 Raise dewar and pump main bath.
2100 Fill N2 cold trap full.
2116 Evacuate IVC, He BG 2.7E-9cc/s.
Introduce He gas into main bath up to G3 reads 70 mbar. He signal goes up to 6.2e-9cc/s rapidly and then drops slowly to 4.2e-9cc/s at the time of this entry. This is likely a virtual leak. We will proceed to transfer liquid N2.
2128 Evacuate 1K pot line
IVC pressure 4.6E-5 mbar. Add 1 mbar N2 exchange gas.
2145 Start LN2 transfer.
2230 Temperature dropping very slowly. Increase pressure of N2 exchange gas to 40 mbar. Increase pressure in dewar.
2310 Cooling rate improved somewhat, but still not very fast. There is liquid nitrogen in the main bath. Probably alright: it's still going down.
2335 Start cryocleaning mixture. Valve 6 13.8% open.
Mixing chamber temperature 231 K.
2355 Level meter resistance 1.32 kΩ. Stop LN2 transfer.