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2017/06/19 (Monday)

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Run 62:

Status Tower removed from fridge. Mixture has been cryocleaned 3 times. Fridge is evacuated but should probably be pumped out again. 1K Pot needle valve is open, so now there will be air in the pot, should pump it out before cooling. Cryostat vacuum jacket has been pumped down to 190 ubar, maybe should be pumped out more before cooling.
1100 Lab = 24.2 C, 34% humidity.
To do: we still don't know why two phonon channels behaved as open circuits during the run. The tower checkout on Friday showed continuity at the detector between both pins of these channels and other phonon channels. The final thing to check is the SQUETs, to see if there is a break in continuity in the phonon lines there.

“Bad” channels and corresponding SQUET
DIB3pA/Side2pB ZC39
DIB4pA/Side2pC ZC26
the other SQUET used in R62 was ZC13
ZC26
pA pB
Shunt+coil Tow1-Tow2 20 kΩ Tow3-Tow4 12.3 kΩ
Coil Tow2-SL15 2.8 Ω Tow4-SL26 2.3 Ω
Shunt Tow1-SL15 20 kΩ Tow3-SL26 12.3 kΩ
Return Tow1-SL2 20 kΩ Tow3-SL47 12.3 kΩ
Other Tow2-SL2 23.2 Ω Tow4-SL47 18.2 Ω
Another Other SL2-SL15 24.0 Ω SL26-SL47 18.3 Ω

The above table indicates that (1) this SQUET has opposite bias-return labeling than the diagram, and (2) the input coil reads around 20 kΩ at room temperature (we never knew that before).

ZC26 - bias-return labeling OPPOSITE of diagram
pA pB pC pD
Return Tow2-SL15 2.8 Ω Tow4-SL26 2.3 Ω Tow6-SL18 2.3 Ω Tow8-SL29 2.2 Ω
Coil Tow1-SL2 20 kΩ Tow3-SL47 12.3 kΩ Tow5-SL4 16.4 kΩ Tow7-SL40 16 kΩ
Shunt SL2-SL15 24.0 Ω SL26-SL47 18.3 Ω SL4-SL18 21 Ω SL40-SL29 21 Ω
ZC39 - bias-return labeling SAME as diagram
pA pB pC pD
Coil Tow2-SL15 16.8 kΩ Tow4-SL26 16.3 kΩ Tow6-SL18 17.6 kΩ Tow8-SL29 12.1 kΩ
Return Tow1-SL2 2.3 Ω Tow3-SL47 2.0 Ω Tow5-SL4 1.8 Ω Tow7-SL40 2.0 Ω
Shunt SL2-SL15 25 Ω SL26-SL47 23.4 Ω SL4-SL18 26 Ω SL40-SL29 20 Ω
ZC13 - bias-return labeling OPPOSITE of diagram
pA pB pC pD
Return Tow2-SL15 2.3 Ω Tow4-SL26 1.9 Ω Tow6-SL18 1.9 Ω Tow8-SL29 2.3 Ω
Coil Tow1-SL2 13.8 kΩ Tow3-SL47 14.6 kΩ Tow5-SL4 18.1 kΩ Tow7-SL40 15.1 kΩ
Shunt SL2-SL15 20.6 Ω SL26-SL47 21.8 Ω SL4-SL18 24 Ω SL40-SL29 23 Ω

Run 63:

For the next run, we will need to check to see whether we have good charge channels. We should check the SQUETs and the side coaxes and the tower faces. Here's an example of a side coax checkout from 23 May 2016:

Side coax ZB-4-4
date: 2015-05-23 who: MF NM
+lead - lead signal typical measured
D11 T11 Qo Rbias 25 nS 26 nS
T12 T13 Qo Rfeedback 25 nS 26 nS
D11 T12 Qo C coupling <1 nS 0.2 nS
D12 T14 Qi Rbias 25 nS 27 nS
T15 T16 Qi Rfeedback 25 nS 26 nS
D12 T15 Qi C coupling <1 nS 36 nS

The above is an example of a blown Qinner coupling capacitor.

1420 Remove G132 from purge cabinet.
G132 electrical checkout:
Detector G132 DIB 1
date/who: 2017-06-19 NM GR
+lead - lead signal typical at SLAC measured
1 2 QET A 100 to 200 Ω 73.0 Ω 72 Ω
3 4 QET B 100 to 200 Ω 82.8 Ω 81.1 Ω
5 6 QET C 100 to 200 Ω 58.7 Ω 58.8 Ω
7 8 QET D 100 to 200 Ω 11.3 Ω 11.2 Ω
9 chassis LED1 Rforward 8 to 9 MΩ present 711 kΩ
9 chassis LED1 Vforward 1.0 to 1.1 V present 1.037 V
chassis 9 LED1 Rreverse <1 nS present 1.4 nS
10 chassis LED2 Rforward 8 to 9 MΩ present 730 kΩ
10 chassis LED2 Vforward 1.0 to 1.1 V present 1.041 V
chassis 10 LED2 Rreverse <1 nS present 1.3 nS
11 12 Qo-Qi 55.0 Ω 56 Ω
12 11 Qi-Qo 56.1 Ω 52.1 Ω
1-8 chassis <1 nS ~100 Ω <1 nS
Detector G132 DIB 3
date/who: 2017-06-19 NM GR
+lead - lead signal typical at SLAC measured
1 2 QET A 100 to 200 Ω 8.5 Ω 8.5 Ω
3 4 QET B 100 to 200 Ω 23.9 Ω 24.0 Ω
5 6 QET C 100 to 200 Ω 10.8 Ω 19.8 Ω, initially unstable ~5 MΩ
7 8 QET D 100 to 200 Ω 29.4 Ω 27.9 Ω
9 chassis LED1 Rforward 8 to 9 MΩ n/c n/c
9 chassis LED1 Vforward 1.0 to 1.1 V n/c n/c
chassis 9 LED1 Rreverse <1 nS n/c n/c
10 chassis LED2 Rforward 8 to 9 MΩ n/c n/c
10 chassis LED2 Vforward 1.0 to 1.1 V n/c n/c
chassis 10 LED2 Rreverse <1 nS n/c n/c
11 12 Qo-Qi 42.8 Ω 42.4 Ω
12 11 Qi-Qo 35.1 Ω 41.1 Ω
1-8 chassis <1 nS ~100 Ω <1 nS

Initially QET C looked open, 1 to 5 was 10 Ω, 1 to 6 was open, but then after some measurements it stablized. Maybe a lose DIB pin or shoddy DIB?

Detector G132 DIB 4
date/who: 2017-06-19 NM GR
+lead - lead signal typical at SLAC measured
1 2 QET A 100 to 200 Ω 38.4 Ω 38.4 Ω
3 4 QET B 100 to 200 Ω 81.5 Ω 80.2 Ω
5 6 QET C 100 to 200 Ω 76.3 Ω 75.4 Ω
7 8 QET D 100 to 200 Ω 27.8 Ω 27.8 Ω
9 chassis LED1 Rforward 8 to 9 MΩ n/c n/c
9 chassis LED1 Vforward 1.0 to 1.1 V n/c n/c
chassis 9 LED1 Rreverse <1 nS n/c n/c
10 chassis LED2 Rforward 8 to 9 MΩ n/c n/c
10 chassis LED2 Vforward 1.0 to 1.1 V n/c n/c
chassis 10 LED2 Rreverse <1 nS n/c n/c
11 12 Qo-Qi n/c n/c
12 11 Qi-Qo n/c n/c
1-8 chassis <1 nS ~100 Ω <1 nS

Although SLAC measured 100 Ω between phonons and chassis, we found them all to be open.

1508 Returned G132 to purge cabinet.
1509 Removed Tower and S101 from purge cabinet.
Side coax ST-3-3
date: 2015-06-19 who: NM GR
+lead - lead signal typical measured
D11 T11 Qo Rbias 25 nS 25.53 nS
T12 T13 Qo Rfeedback 25 nS n/c
D11 T12 Qo C coupling <1 nS 0.3 nS
D12 T14 Qi Rbias 25 nS 25.62 nS
T15 T16 Qi Rfeedback 25 nS n/c
D12 T15 Qi C coupling <1 nS 0.17 nS

With magnifying glass you can clearly see the wire bonds broken on both sets of feedback resistors.

Side coax ST-3-10
date: 2015-06-19 who: NM MF
+lead - lead signal typical measured
D11 T11 Qo Rbias 25 nS <1 nS
T12 T13 Qo Rfeedback 25 nS 26.6 nS
D11 T12 Qo C coupling <1 nS 1.2 nS
D12 T14 Qi Rbias 25 nS <1 nS
T15 T16 Qi Rfeedback 25 nS 26.5 nS
D12 T15 Qi C coupling <1 nS 2.0 nS

With magnifying glass you can clearly see wire bonds broken on both sets of bias resistors.

Side coax ST-3-9
date: 2015-06-19 who: NM MF
+lead - lead signal typical measured
D11 T11 Qo Rbias 25 nS 27.95 nS
T12 T13 Qo Rfeedback 25 nS <1 nS
D11 T12 Qo C coupling <1 nS 0.8 nS
D12 T14 Qi Rbias 25 nS 25.86 nS
T15 T16 Qi Rfeedback 25 nS 25.7 nS
D12 T15 Qi C coupling <1 nS 0.4 nS

All three of these need wirebonds repaired on their resistor arrays.

ST-3-9 ST-3-10 ST-3-3
Broken bonds visible on upper left (qO feedback) Broken bonds on lower resistor arrays (qI and qO bias) Broken bonds on upper resistor arrays (qI and qO feedback)
1610 Begin disassembling stack. We will try leaving the four external LED wires soldered to the side coax extender pins, since we'll be using these again.
1623 Place S101 in purge cabinet.
1627 Return tower base to purge cabinet. Return source/LED holder to purge cabinet with thermometer, external LED wires and extender plugs still connected.

Next Day