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2010/10/15

1400 Conduct leak check
Test of internal leak shows no need for calibration
Background He leak rate of 2.5E-9 mbar l/s
He leak rate of 4.5E-9 mbar l/s, within acceptable parameters
1600 Electrical check
QET A/Ret on stripline 20 is open
Possible bad connection or defective SQUET card
Cooldown checkout sheet (rev C SQUET)
Detector: G41 BH:
SC: ZB1-1-9 RT
Face: 8 Date 2010-10-15
SQUET: ZC23 Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
Phonon
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 18 OK
Feedback B/Ret 2 18 20 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 89,85,85,86,86 OK
QET B/Ret 35 29, 33, 47, 48 86,86,95,86 OK
QET C/Ret 7 5, 9, 10, 28 86,84,74,84 OK
QET D/Ret 38 36, 40, 43, 44 84,83,83,84 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK
Qi bias/QET Ret 15 24 - 26 nS 26 OK
Qo bias/QET Ret 11 26 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 0.725 OK
LED 1 42 chassis 1.0 - 1.1 V 1.137 –
LED 2 26 chassis 1.128 –
Cooldown checkout sheet (rev C SQUET)
Detector: G41 BH:
SC: ZB1-1-6 RT
Face: 5 Date 2010-10-15
SQUET: ZC15 Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 5 OK
SQUID bias B/Ret 19 34 4.6 OK
SQUID bias C/Ret 8 24 4.2 OK
SQUID bias D/Ret 23 39 4.1 OK
Feedback A/Ret 37 21 15 - 25 k 21 OK
Feedback B/Ret 2 18 19 OK
Feedback C/Ret 41 25 18 OK
Feedback D/Ret 22 6 17 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 all open OK
QET B/Ret 35 29, 33, 47, 48 72,72,81,72 OK
QET C/Ret 7 5, 9, 10, 28 70,69,61,68 OK
QET D/Ret 38 36, 40, 43, 44 70,69,69,69 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.063 OK
Qi bias/QET Ret 15 24 - 26 nS open for A, else 26 OK
Qo bias/QET Ret 11 open for A, else 26 OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK
Qo feedback/Drain/Source 30 12, 27 24,23 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 0.71 OK
LED 1 42 chassis 1.0 - 1.1 V 1.134 –
LED 2 26 chassis 1.125 –
2100 Leave IVC to pump overnight to clean any contamination