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Table of Contents

2011/03/16

0025 Open gate valve to check flanges behind it that lie outside the fridge. He leak rate rises from 6.5E-7 mbar l/s to 7.5 mbar l/s.
0105 Spray test all flanges behind gate valve and condenser line speedivalve. He leak rate falls to 6.5E-7 mbar l/s. No leak.
Close all valves and isolate leak checker in preparation for removal from vent on IGH.
0130 Leak checker reconnected to IVC. Isolate leak checker and bellows, and leave to pump overnight to reduce helium background.
0135 Fill N2 cold trap full.
Pump out helium rubber tube with He-4 pump. Close vent speedivalve, and valves 2a and 5a on IGH. Switch off He-4 pump.
0150 Start cryocleaning mixture through cold trap 2. Valve 6 open 13.7%.
0240 Flow seems to have stopped. Open valve 6 14.0% while waiting for bus.
0936 IVC: 4.6mbar. Pump out N2 exchange gas.
0948 Electrical check done. Everything's ok.
0958 Pumped Mixture into dump.
1008 Opened Gate Valve and Condenser SpeediValve.
1024 Performed through-put test. Result is 40 mbar/ minute.
1025 No leak from circulation line to IVC.
1049 Blow out of LN2 begun.
1207 G3 start to drop. Liquid N2 is out. Leak signal start to increase from 1.2e-8cc/s
1211 Shut off He gas
1224 IVC He signal 1.4E-8cc/s.
1231 IVC He BG 1.45E-8cc/s.
1232 Start to pump the bath.
1237 P2 start to drop. Liquid was all out.
1245 IVC He signal 1.44e-8cc/s. There should not be leak between the bath and IVC.
1246 Fill bath with He gas
1249 G3 started to rise. Close V2A, V5A to stop the He gas. IVC He signal: 1.43e-8cc/s.
1252 Turned of V1A; turned on He 4 Pump; closed vent SpeediValve.
1304 Evacuated vent line (turning of V2a, V5a); Evacuated 1k pot and isolated it (opened and closed the big speedi valve)
1308 Closed off IVC.
1321 Filled IVC with 0.1 mbar of He4 exchange gas. There was 2.5 mbar in the pumping line before IVC was opened. Ready to transfer liquid Helium
1340 Begun transfer of Liquid Helium.
1603 LS370 overranged at 2.5kOhm, 4.2K on X12004.
1615 Start to pump out exchange gas. MC X12004: 4.2 K. It's a bit too late to pump out the exchange gas.
1627 Tower temperature: 8K
1702 Helium transfer tube removed. Meter readings and helium level recorded.
1731 Electrical check- good.
Cooldown checkout sheet (rev C SQUET)
Detector: G101 DIB1 BH: Stripline: 19
SC: ZB1-1-9 300 K LN LHe
Face: 5 Date 2011-03-12 Date 2011-03-13 Date 2011-03-16
SQUET: ZC23 Who HC & JZ Who JZ & HC Who RR
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 1.6 OK 80 - 140 101.6 OK
SQUID bias B/Ret 19 34 5 OK 2 OK 80 - 140 89.2 OK
SQUID bias C/Ret 8 24 4.6 OK 1.7 OK 80 - 140 99.2 OK
SQUID bias D/Ret 23 39 4.3 OK 1.6 OK 80 - 140 89.3 OK
Feedback A/Ret 37 21 15 - 25 k 19 OK 9 - 13 k 7.3 OK 1.0 - 1.3 k 1.28 OK
Feedback B/Ret 2 18 21 OK 8.2 OK 1.0 - 1.3 k 1.28 OK
Feedback C/Ret 41 25 19 OK 7.6 OK 1.0 - 1.3 k 1.27 OK
Feedback D/Ret 22 6 18 OK 7 OK 1.0 - 1.3 k 1.27 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 94,87,85,86,86 OK 30 - 40 50,45,43,44,44 OK 20 - 30 32.3,28.3,26.5,27.5,27.4 OK
QET B/Ret 35 29, 33, 47, 48 92,92,100,92 OK 44,44,47,44 OK 20 - 30 26.9,26.5,29.7,26.6 OK
QET C/Ret 7 5, 9, 10, 28 87,85,74,84 OK 45,44,33,44 OK 20 - 30 28.4,27.6,17,26.7 OK
QET D/Ret 38 36, 40, 43, 44 85,84,84,84 OK 44,44,43,44 OK 20 - 30 27.9,27.2,26.7,27 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.043 OK 1.0 - 1.1 k 1.23 OK
Qi bias/QET Ret 15 24 - 26 nS 26 (PA), open (PB, PC, PD) OK < 1 nS >50M, OL OK <1 nS OK OK
Qo bias/QET Ret 11 26 (PA), open (PB, PC, PD) OK >50M, OL OK <1 nS OK OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23 OK 6 - 8 nS 20 OK <1 nS 54.46 MΩ, 54.56 MΩ OK
Qo feedback/Drain/Source 30 12, 27 23 OK 20 OK <1 nS 52.5 MΩ, 52.3 MΩ 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 0.721 OK 0.9 - 1.0 V 1.04 OK — 1.9 OK
LED 1 42 chassis 1.0 - 1.1 V 1.137 – 1.2 - 1.5 V 1.418 – — OL –
LED 2 26 chassis open – open – — OL –

DIB 2

Cooldown checkout sheet (rev C SQUET)
Detector: G101 DIB2 BH: Stripline: 20
SC: ZB1-1-6 300 K LN LHe
Face: 2 Date 2011-03-12 Date 2011-03-13 Date 2011-03-16
SQUET: ZC70 Who HC & JZ Who JZ & HC Who RR
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 4.9 OK 1 - 2 k 1.9 OK 80 - 140 95 OK
SQUID bias B/Ret 19 34 4.4 OK 1.6 OK 80 - 140 99.8 OK
SQUID bias C/Ret 8 24 4.7 OK 1.8 OK 80 - 140 91.4 OK
SQUID bias D/Ret 23 39 5.3 OK 2.1 OK 80 - 140 91 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK 9 - 13 k 15 OK 1.0 - 1.3 k 1.26 OK
Feedback B/Ret 2 18 26 OK 9 OK 1.0 - 1.3 k 1.26 OK
Feedback C/Ret 41 25 29 OK 14 OK 1.0 - 1.3 k 1.27 OK
Feedback D/Ret 22 6 35 OK 17 OK 1.0 - 1.3 k 1.25 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 89,82,80,80,80 OK 30 - 40 50,44,42,43,42 OK 20 - 30 25.5,21.1,19.1, 20.1, 19.6 OK
QET B/Ret 35 29, 33, 47, 48 83,82,90,83 OK 37,36,41,36 OK 20 - 30 20.6,20.1,23.3,20.3 OK
QET C/Ret 7 5, 9, 10, 28 79,77,69,76 OK 41,40,32,40 OK 20 - 30 20.9,19.9,12.4,19.3 OK
QET D/Ret 38 36, 40, 43, 44 81,80,80,80 OK 43,43,42,43 OK 20 - 30 21.6,21.1,20.7,20.9 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.061 OK 1.0 - 1.1 k 1.04 OK 1.0 - 1.1 k 1.23 OK
Qi bias/QET Ret 15 24 - 26 nS open OK < 1 nS open OK <1 nS open OK
Qo bias/QET Ret 11 open 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 ok OK
Qo feedback/Drain/Source 30 12, 27 23,23 OK 20,20 OK <1 nS ok 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 0.706 OK 0.9 - 1.0 V 1.082 OK — 1.6 OK
LED 1 42 chassis 1.0 - 1.1 V 1.129 – 1.2 - 1.5 V 1.412 – — OL –
LED 2 26 chassis 1.121 – 1.405 – — OL –
1829 Close IVC, start condensing mixture.
1942 G1 = 81.4 mbar, G2 = 83 mbar and both plateau. Stop condensing.
1945 Start to circulate mixture. Tower T = 2.3K.

First Pulses

Figure 1: Sample pulses from Q1.
Figure 2: Sample pulses from Q2.
Figure 3: Sample pulses from Q3.
Figure 4: Sample pulses from Q4.
2130 Flash detector overnight: DIB1 LED1, 0.6 mA, 100 μs ON, 2500 μs OFF; DIB2 LED1&2, 0.6 mA, 100 μs ON, 2500 μs OFF.
2245 Fill N2 cold trap full.