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2011/11/10

0055 We spent a few hours in the workshop fabricating three 0.01“ spacers. Just tried two of them out: the side coax on face 5 fits perfectly; and it just about spans the distance on face 2.
Conduct tower level continuity checks:
Detector G21A DIB 1
side coax ZB1-4-6 date/who: 2011-11-10 HC
face 5
+ve lead -ve lead signal measured
3 4 QET B 249 Ω
4 8 QET B-D 329 Ω
7 8 QET D 393 Ω
chassis 9 LED1 Rforward 733 kΩ
chassis 10 LED2 Rforward 748 kΩ
chassis 9 LED1 Vforward 1.101 V
chassis 10 LED2 Vforward 1.101 V
9 chassis LED1 Greverse ≈ 5 nS
10 chassis LED2 Greverse <0.3 nS
Detector G21A DIB 2
side coax ZB1-4-8 date/who: 2011-11-10 HC
face 2
+ve lead -ve lead signal measured
3 4 QET A 126 Ω
4 6 QET A-C 204 Ω
5 6 QET C 191 Ω
4 7 QET A-Qi/Qo 178 Ω
6 7 QET C-Qi/Qo 211 Ω
chassis 9 LED1 Rforward 727 kΩ
chassis 10 LED2 Rforward -
chassis 9 LED1 Vforward 1.096 V
chassis 10 LED2 Vforward -
9 chassis LED1 Greverse <0.2 nS
10 chassis LED2 Greverse -
0120 No shorts to chassis seen. Excellent! However, Pin 1 DIB2 is supposed to be shorted to chassis… Pins 13 & 16 on DIB2 yield a short of 40 MOhms to chassis - short is at DIB. This is fine as we won't be using these channels this run. However, we don't want to damage the side coax. Have to cogitate on this… I'm going home.
Double-bag assembled tower and leave in clean room.
1530 We've discussed it. We'll proceed: the side coax should not incur any mechanical damage, and the shorts to chassis should not affect this run. It's puzzling as to why DIB 2 Pin 1 is not shorted to chassis anymore (or at least through the side coax)… everything else checks out though, so there is no reason to delay.
Fit adapter plate to tower and bring to mini-clean room for installation in K100.
1845 Conduct room temperature electrical check. As expected, Qi bias & Qo bias on DIB2 short to ground:
Detector: G21A DIB1 BH:
SC: ZB1-4-6 300 K Stripline: 20
Face: 5 Date 2011-11-10
SQUET: ZC70 Who JZ & HC
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 4.9 OK
SQUID bias B/Ret 19 34 4.4 OK
SQUID bias C/Ret 8 24 4.7 OK
SQUID bias D/Ret 23 39 5.2 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK
Feedback B/Ret 2 18 25 OK
Feedback C/Ret 41 25 28 OK
Feedback D/Ret 22 6 35 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 106,89,80,83,80 OK
QET B/Ret 35 29, 33, 47, 48 77,77,95,77 OK
QET C/Ret 7 5, 9, 10, 28 76,76,69,76 OK
QET D/Ret 38 36, 40, 43, 44 85,80,80,80 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.061 OK
Qi bias/QET Ret 15 24 - 26 nS Open OK
Qo bias/QET Ret 11 Open OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 43 MOhm OK
Qo feedback/Drain/Source 30 12, 27 43 MOhm 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 Open OK
LED 1 42 chassis 1.0 - 1.1 V 1.129 –
LED 2 26 chassis 1.121 –
Detector: G21A DIB2 BH:
SC: ZB1-4-8 300 K Stripline: 19
Face: 2 Date 2011-11-10
SQUET: ZC23 Who JZ & HC
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
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 19 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 - 80 115,94,86,89,87 OK
QET B/Ret 35 29, 33, 47, 48 87,86,104,87 OK
QET C/Ret 7 5, 9, 10, 28 84,85,74,84 OK
QET D/Ret 38 36, 40, 43, 44 89,84,84,84 OK
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK
Qi bias/QET Ret 15 24 - 26 nS Open 39 Mohm (Qi bias)
Qo bias/QET Ret 11 Open 39 Mohm (Qo bias)
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 44 MOhm OK
Qo feedback/Drain/Source 30 12, 27 44 MOhm 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 0.723 OK
LED 1 chassis 42 1.0 - 1.1 V 1.131 –
LED 2 chassis 26 Open –
2000 Tower installation complete. IVC sealed and under vacuum.
2350 Raise dewar. Pump and flush main bath. Evacuate 1 K pot.