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2013/02/24

0450 Mixing chamber temperature 10 K. Pump helium exchange gas out of IVC.
0740 Mixing chamber temperature 12.4 K. Start filling main bath with liquid helium.
0830 Cease liquid helium transfer. Helium liquid level 92.1%.
0945 Fill N2 cold trap full. Restart cryocleaning mixture through nitrogen cold trap 2.
Fed Cricket 3 pellets.
1825 Mixing chamber temperature 11.2 K and decreasing very slowly. It was around 14 K at end of helium transfer. This doesn't necessarily indicate that there is a leak as the 1 K pot's needle valve is known to leak, and therefore it's temperature is likely to be lower. Temperature of 1 K pot is greater than 7 K.
1830 Mixture has stagnated. Fill N2 cold trap full. Open valve V6 on IGH to 13.9% and resume cryocleaning.
1955 Pump mixture into dump in preparation for condensation.
2000 Isolate IVC. Start 1 K pot; temperature 1.83 K.
2050 Start condensing mixture manually through nitrogen cold trap 1.
2115 Cease manual condensation procedure. Pressure in dump before condensation 720 mbar; after condensation 369 mbar: around 351 mbar of mixture fed into fridge. Open valve 12A on IGH to 100%. Mixing chamber temperature 9.5 K and falling at what appears to be an increasing pace.
2355 Conduct electrical check (mixing chamber temperature dropped from 4.1 K to 3.4 K during check). SQUID Bias to Return for A, B & D on DIB 3 still open; Feedback A & B to Return on DIB 3 still open; QET A & D to Return on DIB 3 still open: fortunately, channel C on DIB 3 looks fine so we can still read all the phonon channels on Side 1. LED 2 on DIB 3 leaks in reverse direction, but this is a known problem: lower conductivity of 13 nS than last run (24 nS).
Detector: G106a DIB1 BH: Stripline: 19
SC: ZB1-4-6 300 K 80K LHe
Face: 2 Date 2013-02-20 Date 2013-02-23 Date 2013-02-24
SQUET: ZC23 Who AK & SM Who RR Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead) (Gnd lead)
Nominal: Nominal: Nominal:
< 0.1 nS < 0.1 nS < 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 4.4k OK 1 - 2 k 1.7k OK 80 - 140 107 OK
SQUID bias B/Ret 19 34 5.0k OK 2.0k OK 80 - 140 96 OK
SQUID bias C/Ret 8 24 4.6k OK 1.8k OK 80 - 140 105 OK
SQUID bias D/Ret 23 39 4.3k OK 1.6k OK 80 - 140 95 OK
Feedback A/Ret 37 21 15 - 25 k 19k OK 9 - 13 k 7.4k OK 1.0 - 1.3 k 1.27k OK
Feedback B/Ret 2 18 20k OK 8.4k OK 1.0 - 1.3 k 1.27k OK
Feedback C/Ret 41 25 19k OK 7.7k OK 1.0 - 1.3 k 1.26k OK
Feedback D/Ret 22 6 18k OK 7.2k OK 1.0 - 1.3 k 1.25k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 111,97,89,92,90 OK 30 - 40 52, 51, 46, 50, 48 OK 20 - 30 37,36,31,35,34 OK
QET B/Ret 35 29, 33, 47, 48 90,90,98,90 OK 48, 47, 69, 47 OK 20 - 30 33,32,51,32 OK
QET C/Ret 7 5, 9, 10, 28 86,85,75,85 OK 47, 47, 36,46 OK 20 - 30 32,33,22,32 OK
QET D/Ret 38 36, 40, 43, 44 100,86,85,86 OK 48, 46, 46 ,46 OK 20 - 30 34,32,31,31 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.07k OK 1.0 - 1.1 k 1.045k OK 1.0 - 1.1 k 1.26k OK
Qi bias/QET Ret 15 24 - 26 nS 25 OK < 1 nS OK OK <1 nS OK OK
Qo bias/QET Ret 11 25 OK OK OK <1 nS OK OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK 6 - 8 nS 20,20 OK <1 nS 18,18 OK
Qo feedback/Drain/Source 30 12, 27 23,23 OK 20,20 OK <1 nS 19,19 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – OK <0.1 nS – OK
Qo drain 12 chassis – OK – OK <0.1 nS – OK
Qi source 31 chassis – OK – OK <0.1 nS – OK
Qo source 27 chassis – OK – OK <0.1 nS – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.723 OK 0.9 - 1.0 V 1.09 OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.128 – 1.2 - 1.5 V 1.4 – — – –
LED 2 chassis 26 1.117 – 1.392 – — – –
Detector: G106a DIB2 BH: Stripline: 20
SC: ZB1-4-4 300 K LN LHe
Face: 5 Date 2013-02-20 Date 2013-02-23 Date 2013-02-24
SQUET: ZC70 Who AK & SM Who RR Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead) (Gnd lead)
Nominal: Nominal: Nominal:
< 0.1 nS < 0.1 nS < 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 4.8k OK 1 - 2 k 2.0k OK 80 - 140 99 OK
SQUID bias B/Ret 19 34 4.4k OK 1.7k OK 80 - 140 105 OK
SQUID bias C/Ret 8 24 4.6k OK 1.8k OK 80 - 140 96 OK
SQUID bias D/Ret 23 39 5.2k OK 2.1k OK 80 - 140 96 OK
Feedback A/Ret 37 21 15 - 25 k 29k OK 9 - 13 k 15k OK 1.0 - 1.3 k 1.25k OK
Feedback B/Ret 2 18 25k OK 9.3k OK 1.0 - 1.3 k 1.25k OK
Feedback C/Ret 41 25 28k OK 14k OK 1.0 - 1.3 k 1.26k OK
Feedback D/Ret 22 6 34k OK 17k OK 1.0 - 1.3 k 1.24k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 110,96,83,86,.85 OK 30 - 40 50, 49, 44, 47, 46 OK 20 - 30 29,28,23,26,25 OK
QET B/Ret 35 29, 33, 47, 48 81,80,94,80 OK 40, 39, 60, 39 OK 20 - 30 25,24,43,25 OK
QET C/Ret 7 5, 9, 10, 28 70,77,70,77 OK 43, 43, 35, 42 OK 20 - 30 24,24,16,23 OK
QET D/Ret 38 36, 40, 43, 44 100,82,83,82 OK 47, 45, 44, 45 OK 20 - 30 26,25,24,24 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.06k OK 1.0 - 1.1 k 1.042k OK 1.0 - 1.1 k 1.24k OK
Qi bias/QET Ret 15 24 - 26 nS 26 OK < 1 nS OK OK <1 nS OK OK
Qo bias/QET Ret 11 26 OK OK OK <1 nS OK OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 24,24 OK 6 - 8 nS 21,21 OK <1 nS 19,19 OK
Qo feedback/Drain/Source 30 12, 27 24,24 OK 21,21 OK <1 nS 19,19 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – OK <0.1 nS – OK
Qo drain 12 chassis – OK – OK <0.1 nS – OK
Qi source 31 chassis – OK – OK <0.1 nS – OK
Qo source 27 chassis – OK – OK <0.1 nS – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V open OK 0.9 - 1.0 V 1.084 OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.12 – 1.2 - 1.5 V 1.397 – — – –
LED 2 chassis 26 1.11 – 1.39 – — – –
Detector: G106a DIB3 BH: Stripline: 21
SC: ZB1-4-8 300 K LN LHe
Face: 6 Date 2013-02-20 Date 2013-02-23 Date 2013-02-24
SQUET: ZC13 Who AK & SM Who RR Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead) (Gnd lead)
Nominal: Nominal: Nominal:
< 0.1 nS < 0.1 nS < 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 4.6k OK 1 - 2 k open OK 80 - 140 open OK
SQUID bias B/Ret 19 34 4.7k OK open OK 80 - 140 open OK
SQUID bias C/Ret 8 24 5.3k OK 2.1k OK 80 - 140 118 OK
SQUID bias D/Ret 23 39 4.9k OK open OK 80 - 140 open OK
Feedback A/Ret 37 21 15 - 25 k 19k OK 9 - 13 k open OK 1.0 - 1.3 k open OK
Feedback B/Ret 2 18 20k OK open OK 1.0 - 1.3 k open OK
Feedback C/Ret 41 25 30k OK 12k OK 1.0 - 1.3 k 1.26k OK
Feedback D/Ret 22 6 21k OK 8.6k OK 1.0 - 1.3 k 1.25k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 84, 84, 79, 83, 81 OK 30 - 40 open OK 20 - 30 open OK
QET B/Ret 35 29, 33, 47, 48 79, 79, 95, 79 OK 43, 42, 61, 42 OK 20 - 30 27,26,55,27 OK
QET C/Ret 7 5, 9, 10, 28 82,82,73,82 OK 42, 42, 33, 42 OK 20 - 30 27,27,18,27 OK
QET D/Ret 38 36, 40, 43, 44 83, 80, 79, 80 OK open OK 20 - 30 open OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.068k OK 1.0 - 1.1 k 1.05k OK 1.0 - 1.1 k 1.24k OK
Qi bias/QET Ret 15 24 - 26 nS <1 OK < 1 nS open OK <1 nS open OK
Qo bias/QET Ret 11 <1 OK open OK <1 nS open OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK 6 - 8 nS 19, 19 OK <1 nS 19,19 OK
Qo feedback/Drain/Source 30 12, 27 23,23 OK 20,20 OK <1 nS 19,19 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – OK <0.1 nS – OK
Qo drain 12 chassis – OK – OK <0.1 nS – OK
Qi source 31 chassis – OK – OK <0.1 nS – OK
Qo source 27 chassis – OK – OK <0.1 nS – OK
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.713 OK 0.9 - 1.0 V 1.08 OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.117 10 nS 1.2 - 1.5 V 1.396 OK — – –
LED 2 chassis 26 1.108 open 1.386 23 nS — – 13 nS