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2012/07/05

1140 Filled LN2 cold trap.
1320 Conduct electrical check at 5.4 K:
Detector: G103a DIB1 BH: Stripline: 19
SC: ZB1-1-6 300 K LN LHe
Face: 2 Date 2012-07-03 Date 2012-07-04 Date 2012-07-05
SQUET: ZC23 Who AK & RR & DS Who HC & AK Who DS & AK
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 4.4 OK 1 - 2 k 1.7 OK 80 - 140 106 OK
SQUID bias B/Ret 19 34 5 OK 2.1 OK 80 - 140 98 OK
SQUID bias C/Ret 8 24 4.6 OK 1.8 OK 80 - 140 104 OK
SQUID bias D/Ret 23 39 4.3 OK 1.6 OK 80 - 140 94 OK
Feedback A/Ret 37 21 15 - 25 k 18 OK 9 - 13 k 7.5 OK 1.0 - 1.3 k 1.26 OK
Feedback B/Ret 2 18 20 OK 7.5 OK 1.0 - 1.3 k 1.28 OK
Feedback C/Ret 41 25 19 OK 7.9 OK 1.0 - 1.3 k 1.26 OK
Feedback D/Ret 22 6 18 OK 7.3 OK 1.0 - 1.3 k 1.25 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 120, 103, 92, 96, 93 15 30 - 40 80,63,52,56,53 10 20 - 30 73, 58, 44, 47, 44 2.5
QET B/Ret 35 29, 33, 47, 48 92, 91, 106, 92 13 52,51,67,52 10 20 - 30 38, 37, 53, 37 OK
QET C/Ret 7 5, 9, 10, 28 97, 86, 75, 85 12 58,47,36,46 10 20 - 30 45, 33, 22, 32 2.5
QET D/Ret 38 36, 40, 43, 44 99,85, 85, 85 12 60,47,46,47 10 20 - 30 47, 34, 33, 33 3
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.045 OK 1.0 - 1.1 k 1.26 OK
Qi bias/QET Ret 15 24 - 26 nS 27 12 < 1 nS 27 7 <1 nS 1.8 OK
Qo bias/QET Ret 11 27 12 27 7 <1 nS 0.5 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 20, 20 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 0.725 OK 0.9 - 1.0 V 1.092 OK — OK
LED 1 chassis 42 1.0 - 1.1 V OPEN – 1.2 - 1.5 V open – — –
LED 2 chassis 26 1.11 – 1.379 – — –
Detector: G103a DIB2 BH: Stripline: 20
SC: ZB1-1-9 300 K LN LHe
Face: 5 Date 2012-07-03 Date 2012-07-04 Date 2012-07-05
SQUET: ZC28 Who AK & RR & DS Who HC & AK Who DS & AK
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 4.0 k OK 1 - 2 k 1.6 OK 80 - 140 113 OK
SQUID bias B/Ret 19 34 4.3 k 12 nS 1.6 9 nS 80 - 140 97 OK
SQUID bias C/Ret 8 24 4.9 k 12 nS 1.9 OK 80 - 140 101 OK
SQUID bias D/Ret 23 39 4.3 k 10 nS 1.6 OK 80 - 140 88 OK
Feedback A/Ret 37 21 15 - 25 k 23.7 k OK 9 - 13 k 8.7 OK 1.0 - 1.3 k 1.25 OK
Feedback B/Ret 2 18 17.4 k 12 nS 7.4 9 nS 1.0 - 1.3 k 1.27 OK
Feedback C/Ret 41 25 20.7 k 11 nS 8.8 OK 1.0 - 1.3 k 1.38 OK
Feedback D/Ret 22 6 18.3 k OK 7.4 OK 1.0 - 1.3 k 1.25 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 115, 115, 81,85,82 13 nS 30 - 40 72,60,43,46,43 9 nS 20 - 30 65, 50, 35, 39, 35 7
QET B/Ret 35 29, 33, 47, 48 76, 75, 108, 76 11 nS 43,42,57,42 9 nS 20 - 30 31, 30, 46, 30 5
QET C/Ret 7 5, 9, 10, 28 85, 73, 65, 72 11 nS 49,37,30,37 9 nS 20 - 30 37, 24, 16, 24 OK
QET D/Ret 38 36, 40, 43, 44 93, 72, 71, 71 15 nS 51,39,38,38 9 nS 20 - 30 40, 27, 26, 26 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.06 OK 1.0 - 1.1 k 1.051 OK 1.0 - 1.1 k 1.23 OK
Qi bias/QET Ret 15 24 - 26 nS 26 12 < 1 nS 26 7 nS <1 nS 3 6
Qo bias/QET Ret 11 25 12 26 7 nS <1 nS 0.4 OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23.4, 23.5 13 nS 6 - 8 nS 21,21 OK <1 nS 18, 18 OK
Qo feedback/Drain/Source 30 12, 27 23.2, 23,2 12 nS 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 .71 V OK 0.9 - 1.0 V 1.083 OK — OK
LED 1 chassis 42 1.0 - 1.1 V 1.11 V – 1.2 - 1.5 V 1.385 – — –
LED 2 chassis 26 1.11 V – 1.376 – — –
Detector: G103a DIB3 BH: Stripline: 21
SC: ZB1-1-11 300 K LN LHe
Face: 6 Date 2012-07-03 Date 2012-07-04 Date 2012-07-05
SQUET: ZC70 Who AK & RR & DS Who HC & AK Who DS&AK
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 OK 80 - 140 100 OK
SQUID bias B/Ret 19 34 4.4k OK 1.8 OK 80 - 140 114 OK
SQUID bias C/Ret 8 24 4.6k OK 1.9 OK 80 - 140 98 OK
SQUID bias D/Ret 23 39 5.2k OK 2.1 OK 80 - 140 96 OK
Feedback A/Ret 37 21 15 - 25 k 29k OK 9 - 13 k 15 OK 1.0 - 1.3 k 1.25 OK
Feedback B/Ret 2 18 25k OK 9.5 OK 1.0 - 1.3 k 1.27 OK
Feedback C/Ret 41 25 28k OK 14 OK 1.0 - 1.3 k 1.26 OK
Feedback D/Ret 22 6 34k OK 18 OK 1.0 - 1.3 k 1.24 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 120, 108, 94, 98, 95 20 nS 30 - 40 81,67,54,57,54 10 nS 20 - 30 70, 54, 38, 42, 39 10nS
QET B/Ret 35 29, 33, 47, 48 88, 87, 103, 87 15nS 47,46,62,47 10 nS 20 - 30 33, 32, 48, 32 11nS
QET C/Ret 7 5, 9, 10, 28 102, 85, 76, 84 12 nS 56,46,37,46 10 nS 20 - 30 41, 27, 18, 27 3nS
QET D/Ret 38 36, 40, 43, 44 102, 87, 86, 87 13 nS 61,48,48,48 10 nS 20 - 30 43, 29, 28, 28 5nS
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.065 OK 1.0 - 1.1 k 1.042 OK 1.0 - 1.1 k 1.24 OK
Qi bias/QET Ret 15 24 - 26 nS OPEN OK < 1 nS open OK <1 nS 0.51 OK
Qo bias/QET Ret 11 OPEN OK open OK <1 nS 2 3nS
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23, 23 OK 6 - 8 nS 20,20 OK <1 nS 18.5, 18.4 OK
Qo feedback/Drain/Source 30 12, 27 23, 23 OK 20,20 OK <1 nS 19.3, 19.1 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 open OK — – OK
LED 1 chassis 42 1.0 - 1.1 V 1.11V – 1.2 - 1.5 V 1.384 – — – –
LED 2 chassis 26 OPEN – open – — – –
1500 Start 1 K pot. Start condensing mixture through nitrogen cold trap 1.
1630 Majority of mixture has condensed. Start circulating mixture.
Quick survey on base temperature:
Table 1: What base temperature will we reach?
Chagani 90 mK
Kennedy 81 mK
Radpour 70 mK
Monin 79 mK
Strandberg 80 mK
1730 Valve 6 fully open and dump has been bled dry. Circulation procedure complete. Tower is cooling very slowly. The base temperature is still decreasing though. It may be best to wait until it reaches a stable temperature before making any futher comment.
2155 Base temperature currently 90.6 mK. It had been stuck at 91.3 mK for about an hour, but appears to have started to drop again, albeit very slowly. There is a significantly large amount of mass to cool down, so we could simply wait until tomorrow morning to see what temperature we've reached. No harm in taking a look at the other temperature stages though.
Pressures of G1 & G2 are pretty low at 49 mbar & 58 mbar respectively. Pressure of P1 is 0.065 mbar. It may be a good idea to start with the still.
2220 Resistances of temperature stage thermometers:
Table 2: Resistance of temperature stage thermometers.
Stage Measured Resistance [kΩ] Resistance during Run 29 [kΩ] Nominal Resistance from manual [kΩ]
Still 4.52 4.5 4.53
Cold Plate 6.1 15.5 23.4
Mixing Chamber 22.5 25 134
2230 Cold plate appears to be very warm, which is very surprising considering that we have reached a similar base temperature as that in Run 29 (90 mK vs. 84 mK). Temperature of still is where it should be.
2305 Still heater has been on at power 1 mW for the last 20 minutes. Mixing chamber temperature has risen to 99 mK. It was unlikely to work as this doesn't appear to be the problem. Turn still heater off.