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2016/10/03 (Monday)

Previous Day

Status: warmup yesterday, mix left to expand from fridge to dump, He gas in main bath vacuum jacket to boil off remaining bath
0845 Tower = 190 K, Sorb = >250 K since 02:14, IVC = 2.5 mbar, G1/G2 = 675/615 mbar.
0850 Pump mix from fridge to dump: close V4, turn on 3He pump, open V6 to 13.8%. Still gate valve, condenser speedivalve, V1, V3, V6, V9 are open.
0915 Move shield wall back into storage.
Dismantle lead castle for 57Co source.
0935 G2 (Dump pressure) has flattened out to 785 mbar. Stop pumping mix to dump, close all valves, turn off 3He pump.
0945 Start flowing N2 through MB using LN2 transfer tube
0955 Fill IVC with N2 gas, to about 730 mbar according to the mechanical gauge. Tower = 198 K.
1000 Let one hose-length of N2 gas into MB vacuum jacket
1025 Neither letting more gas into vacuum jacket nor flowing gas through MB seem to have improved the warming rate. Tower = 201 K.
1045 Lower dewar and place plastic bag around IVC as it warms. Tower = 203K.
1108 Begin pumping out Main Bath dewar jacket with scroll pump. External pressure sensor reads 6.3E-1 mbar.
1230 Tower = 243 K
1300 Scroll pump = 46 μbar, MB vacuum jacket = 86 μbar. Switch to pumping on it with turbo pump for a while.
1340 Tower = 260 K
1340 Turbo pump = 1.4 μbar, MB vacuum jacket = 54 μbar.
1400 Tower = 269 K
1400 Turbo pump = 1.0 μbar, MB vacuum jacket = 40 μbar. Stop pumping out vacuum jacket to lower Dewar all the way.
1410 Conducting electrical check at 265K. DIB2 (readout side) still looks good. We still see the shorts to ground of 40MΩ on SQUID Bias C and of 20MΩ on Feedback C and Feedback Ret. These shorts to ground are higher resistance than we saw after installation, but we are still not room temperature yet, so these may decrease.
1415 DIB3's electrical check passes just fine.
1445 Lower Dewar into pit. Remove plastic bag from fridge with Tower around 270 K. Sponge it off a bit. Erect mini-cleanroom around fridge.
1520 HV#2 (G101c) detector arrives from Stanford in big wooden crate. Pressure gauge reads 7 PSI, somewhat above the red mark.
1535 Move G101c detector into clean room and remove from shipping vessel

from Matt Cherry @ Stanford: 

For the shipping, I placed kapton tape on the underside of the connector
lid to prevent copper debris from falling through.
The housing is clamped inside the purge vessel by a stainless plate.
Unfortunately the designed clamping style was unusable after I received it
from TAMU, but I believe my method will be fine.  You'll just need to
remove the four nuts, then the top steel plate.  The lower steel plate is
attached to the connector lid, and the detector can be lifted out with that.
I'm not sure Mark's accelerometer is recording.  The light went off
yesterday, and I could not figure out how to charge it.  I included it, and
the small software disc.
S1:
  d1a=TES1 (100.4), b=TES0 (125.8)                  <<== d1 is UMN DIB 4
  d2a=TES4 (107.2), b=TES3 (59.3), c=TES2 (110.8)   <<== d2 is UMN DIB 1
  d3c=TES5 (34.1)                                   <<== d3 is UMN DIB 3   
S2:
  d1c=TES6 (93.3), d=(non-functional TESs) (97.1)***  <<== d1 is UMN DIB 4
  d2d=(non-functional TESs) (79.2)***                 <<== d2 is UMN DIB 1
  d3b=TES11 (26.2)                                    <<== d3 is UMN DIB 3

DIB1 is the one opposite the empty slot. DIB3 is identified because pA and pD are open. Labeling the three DIBs with Kapton tape, one piece on DIB1, two on DIB2, three on DIB 3

TOP is side that DIB slots are closer to (side nearest tower)

Loose socket on DIB3 pin1 (pA return)

Detector G101C DIB 1
date/who: 2016-10-03 DS NM MF
+lead - lead signal typical measured
1 2 QET A 100 to 200 Ω 108.3 Ω
3 4 QET B 100 to 200 Ω 59.5 Ω
5 6 QET C 100 to 200 Ω 99.2 Ω
7 8 QET D 100 to 200 Ω 89.3 Ω
9 chassis LED1 Rforward 8 to 9 MΩ open
9 chassis LED1 Vforward 1.0 to 1.1 V OL V
chassis 9 LED1 Rreverse <1 nS open
10 chassis LED2 Rforward 8 to 9 MΩ open
10 chassis LED2 Vforward 1.0 to 1.1 V OL V
chassis 10 LED2 Rreverse <1 nS open
11 12 Qo-Qi n/a
12 11 Qi-Qo n/a
1-8 chassis <1 nS <1 nS
Detector G101C DIB 4
date/who: 2016-10-03 DS NM MF
+lead - lead signal typical measured
1 2 QET A 100 to 200 Ω 97.7 Ω
3 4 QET B 100 to 200 Ω open
5 6 QET C 100 to 200 Ω 92.9 Ω
7 8 QET D 100 to 200 Ω 86.1 Ω
9 chassis LED1 Rforward 8 to 9 MΩ open
9 chassis LED1 Vforward 1.0 to 1.1 V OL V
chassis 9 LED1 Rreverse <1 nS open
10 chassis LED2 Rforward 8 to 9 MΩ open
10 chassis LED2 Vforward 1.0 to 1.1 V OL V
chassis 10 LED2 Rreverse <1 nS open
11 12 Qo-Qi n/a
12 11 Qi-Qo n/a
1-8 chassis <1 nS <1 nS
Detector G101C DIB 3
date/who: 2016-10-03 DS NM MF
+lead - lead signal typical measured
1 2 QET A 100 to 200 Ω open
3 4 QET B 100 to 200 Ω 26.0 Ω
5 6 QET C 100 to 200 Ω 33.9 Ω
7 8 QET D 100 to 200 Ω open
9 chassis LED1 Rforward 8 to 9 MΩ open
9 chassis LED1 Vforward 1.0 to 1.1 V OL V
chassis 9 LED1 Rreverse <1 nS open
10 chassis LED2 Rforward 8 to 9 MΩ open
10 chassis LED2 Vforward 1.0 to 1.1 V OL V
chassis 10 LED2 Rreverse <1 nS open
11 12 Qo-Qi open
12 11 Qi-Qo open
1-8 chassis <1 nS <1 nS

Photographs of DIBs on both sides reveal no LEDs installed on DIBs.

DIB4 pB (side1) broken wirebond is visible.

DIB4 pA and pB (side1) were supposed to be bonded to pC and pD, and it actually looks like it would have been easier to do them that way, bonds wouldn't have to be as long.

1640 Put detector G101c into purge cabinet
1715 Tower = 283 K
Side 2
CW from lower left: DIB1, DIB3, DIB4
Side 1 DIB4: Pin3 (pB ret) has broken bond Side 1 DIB1 Side 1 DIB3
Side 2 DIB1 Side 2 DIB4 Side 2 DIB3

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