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2012/12/20

0015 Fed Cricket 3 pellets.
Check of helium background leak rate in hose yields 4.1E-8 mbar l/s. Continue evacuating hose with turbo pump. IVC isolated.
0025 Fill N2 cold trap full.
1120 Fed Cricket 3 pellets.
1350 Fill N2 cold trap full.
1410 Check of helium background leak rate in hose yields 3.2E-8 mbar l/s. Leak rate drops when IVC is opened. Isolate IVC. Continue evacuating hose with turbo pump.
Pump mixture into dump in preparation for condensation.
1430 Start 1 K pot, temperature 1.76 K.
1435 Stop pumping mixture into dump. Pressure in dump 731 mbar. Open gate valve and condenser line speedivalve. Stabilise 1 K pot temperature at 1.83 K. Mixing chamber temperature 7.5 K. Start condensing mixture manually through nitrogen cold 1.
1450 Close off dump. Pressure of mixture left in dump 380 mbar (ie. 350 mbar dump pressure fed into fridge).
1455 Fully open valve V12A on IGH. Wait for mixture to condense. Mixing chamber temperature 7.1 K and falling.
1700 Leak checked lines, valves and gaskets from valve isolating IVC to leak checker. Started with helium background leak rate of 5.2E-8 mbar l/s, and finished with 1.7E-7 mbar l/s. Increase in line with that expected from steadily rising background. No sudden jumps in the leak rate were witnessed.
1725 Commence helium transfer. Helium liquid level 0.1%.
1815 Cease helium transfer. Helium liquid level 90.2%.
2000 Conduct electrical check at 2.2 K. No problems witnessed apart from LED 2 on DIB 3 closed (conductivity 23 nS) in reverse direction:
Detector: G106a DIB1 BH: Stripline: 19
SC: ZB1-4-6 300 K 80K LHe
Face: 2 Date 2012-12-16 Date 2012-12-18 Date 2012-12-20
SQUET: ZC23 Who HC & RR Who HC 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 1.6k 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 1.7k 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 7.3k OK 1.0 - 1.3 k 1.27k OK
Feedback B/Ret 2 18 20k OK 8.2k OK 1.0 - 1.3 k 1.27k OK
Feedback C/Ret 41 25 19k OK 7.6k OK 1.0 - 1.3 k 1.26k OK
Feedback D/Ret 22 6 18k OK 7.1k OK 1.0 - 1.3 k 1.25k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 107,115,88,92,89 OK 30 - 40 61,59,48,52,49 OK 20 - 30 50,47,35,38,36 OK
QET B/Ret 35 29, 33, 47, 48 91,90,105,91 OK 50,49,63,49 OK 20 - 30 35,35,49,35 OK
QET C/Ret 7 5, 9, 10, 28 88,86,75,85 OK 47,47,36,46 OK 20 - 30 34,33,22,32 OK
QET D/Ret 38 36, 40, 43, 44 94,86,86,86 OK 52,48,47,47 OK 20 - 30 39,33,33,33 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 1.094 OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.128 – 1.2 - 1.5 V 1.403 – — – –
LED 2 chassis 26 1.117 – 1.395 – — – –
Detector: G106a DIB2 BH: Stripline: 20
SC: ZB1-4-4 300 K LN LHe
Face: 5 Date 2012-12-16 Date 2012-12-18 Date 2012-12-20
SQUET: ZC28 Who HC & RR Who HC 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 4.0k OK 1 - 2 k 1.5k OK 80 - 140 113 OK
SQUID bias B/Ret 19 34 4.3k OK 1.5k OK 80 - 140 91 OK
SQUID bias C/Ret 8 24 4.9k OK 1.9k OK 80 - 140 102 OK
SQUID bias D/Ret 23 39 4.3k OK 1.5k OK 80 - 140 88 OK
Feedback A/Ret 37 21 15 - 25 k 24k OK 9 - 13 k 8.4k OK 1.0 - 1.3 k 1.25k OK
Feedback B/Ret 2 18 17k OK 7.2k OK 1.0 - 1.3 k 1.26k OK
Feedback C/Ret 41 25 21k OK 8.6k OK 1.0 - 1.3 k 1.42k OK
Feedback D/Ret 22 6 18k OK 7.1k OK 1.0 - 1.3 k 1.25k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 94,94,77,80,.77 OK 30 - 40 53,49,39,43,39 OK 20 - 30 44,35,26,29,26 OK
QET B/Ret 35 29, 33, 47, 48 75,75,89,75 OK 40,39,53,39 OK 20 - 30 27,26,39,27 OK
QET C/Ret 7 5, 9, 10, 28 75,72,65,72 OK 39,38,30,37 OK 20 - 30 24,23,16,23 OK
QET D/Ret 38 36, 40, 43, 44 79,72,72,72 OK 43,39,39,39 OK 20 - 30 31,26,26,26 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.06k OK 1.0 - 1.1 k 1.052k 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 23 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 0.707 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 1.4 – — – –
LED 2 chassis 26 1.11 – 1.392 – — – –
Detector: G106a DIB3 BH: Stripline: 21
SC: ZB1-4-8 300 K LN LHe
Face: 6 Date 2012-12-16 Date 2012-12-18 Date 2012-12-20
SQUET: ZC70 Who HC & RR Who HC 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 4.9k OK 1 - 2 k 2.0k OK 80 - 140 100 OK
SQUID bias B/Ret 19 34 4.4k OK 1.7k OK 80 - 140 106 OK
SQUID bias C/Ret 8 24 4.7k OK 1.8k OK 80 - 140 98 OK
SQUID bias D/Ret 23 39 5.3k 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 1.26k OK
Feedback B/Ret 2 18 25k OK 9.2k OK 1.0 - 1.3 k 1.26k OK
Feedback C/Ret 41 25 28k OK 14k OK 1.0 - 1.3 k 1.26k OK
Feedback D/Ret 22 6 35k OK 17k OK 1.0 - 1.3 k 1.24k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 102,102,90,93,90 OK 30 - 40 63,60,50,54,51 OK 20 - 30 42,38,28,31,28 OK
QET B/Ret 35 29, 33, 47, 48 88,87,100,87 OK 44,43,56,44 OK 20 - 30 28,28,40,28 OK
QET C/Ret 7 5, 9, 10, 28 87,85,76,85 OK 47,46,37,46 OK 20 - 30 26,26,17,26 OK
QET D/Ret 38 36, 40, 43, 44 96,89,89,89 OK 53,49,48,49 OK 20 - 30 32,27,27,27 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.066k OK 1.0 - 1.1 k 1.044k OK 1.0 - 1.1 k 1.25k 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 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 open OK 0.9 - 1.0 V 1.091 OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.119 2 nS 1.2 - 1.5 V 1.396 OK — – –
LED 2 chassis 26 1.108 open 1.389 23 nS — – 23 nS
2005 Most of the mixture has condensed. Switch to H35 thermometer and start automated circulation procedure.
2040 Valve V6 on IGH is fully open. Stop automated circulation procedure. Mixing chamber temperature 105 mK and falling.
2230 Mixing chamber temperature 73.0 mK. Rate of cool down has slowed, but it's still heading in the right direction. Would be interesting to see the situation tomorrow morning. Could potentially flash the detector for a couple of hours, wait for it to cool down, tune the SQUIDs, conduct charge breakdown measurements and measure the Tcs. This is rather ambitious, and also dependent on whether the fridge warms up when the DCRCs are plugged in. There is still cooling power in the fridge (still pressure 0.07 mbar, pressures in G1 & G2 are 76 mbar & 76 mbar respectively).
Fill N2 cold trap full.
2240 Fed Cricket 4 pellets.
Mixing chamber temperature 72.4 mK and falling at same rate as that 10 minutes ago.