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2017/09/11 (Monday)

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Status Both LN2 traps warm and pumped out. Mixture in dump (LHe cold trap isolated at around 20 K). 1K Pot needle valve open. Cryostat vacuum jacket pumped out.
DIB Side Coax Tower Face Direction Stripline
DIB 1 ZB1-1-9 5 E 19
DIB 3 ZB1-1-11 3 SW 20
DIB 4 ZB1-6 2 W 27
1030 Consulting k100coldhardware, the tower we are using has two bad faces, 1 and 6. By the table above we'll use tower faces 2,3,5. Verified that all the traces are good in these tower faces using the multimeter.
1040 Attach detector stack to tower connector spool
1050 Assemble the new side coax extenders. Attach white poly pin guides to copper spacers. The spacers are marked T for Tower side, SC on Side Coax side. The pins on the tower are not centered (they are shifted to the left as you face the detector-end-up tower), so the pin guides must be attached in the correct orientation.
620 621 622 623
1105 Discovered that the cover plates on the side coaxes are too long. The side coax won't plug into the DIB pins all the way with the plates on because they hit the electrode housing beneath the detector. (It seems they were designed for a detector in Position 1, the closest housing to the tower.) So we are removing the cover plates. This leaves one wall missing for the side coax wires, exposing them on the inner side.
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1120 We'll only use pins on the extenders where needed. Only the connected charge channels, 3 pins each at the tower side, plus the pins listed below to bias the LEDs and the electrode, plus pins for the DIB LEDs in case we want to use them.
1125 Assembling pins for extender plugs. Each is 4 mill-max pins, 3 of standard length and 1 cut somewhat shorter.
628 629 630 631
1140 DIB4 side coax is now attached. The extender sockets have to be guided onto the side coax pins one at a time with tweezers.
632 633 634 635
Elec LED IR1 DIB3 A @ extender plug
Elec LED UV1 DIB3 B @ extender plug
Elec LED IR2 DIB3 C @ extender plug
Elec LED UV2 DIB3 D @ extender plug
Elec bias DIB1 A+Aret @ extender plug
Elec LED Gd1 attach to tower face with screw
Elec LED Gd2 attach to tower face with screw
1150 Begin to work on wire connections. The wires from the electrode housing will be soldered to the extender pins, then the connector pins will be inserted through the extender into the tower.
636 637 638 639
1500 Continue soldering LED and electrode wires.
1535 Start attaching remaining two side coaxes
640 641 642 643
1600 Begin electrical checkout
Tower Level Checkout
Detector S1502 Date 2017-09-11 Who NM MF
DIB 1 Face 5 Side Coax ZB1-1-9
+lead - lead signal typical prev. measured
11 14 Det cont, Rbias 12 to 13 nS - 13 nS
12 11 Qo C coupling <1 nS - 0.4 nS
12 13 Qo Rfeedback 24 to 26 nS - 26 nS
15 14 Qi C coupling <1 nS - 0.4 nS
15 16 Qi Rfeedback 24 to 26 nS - 26 nS
1 11 Electrode isol <1 nS - 0.11 nS
All pins chassis isolation <1.0nS - <1 nS
DIB 3 Face 3 Side Coax ZB1-1-11
+lead - lead signal typical prev. measured
11 DIB4 11 Det cont, Rbias 12 to 13 nS - 13 nS
12 11 Qo C coupling <1 nS - 0.1 nS
12 13 Qo Rfeedback 24 to 26 nS - 26 nS
15 14 Qi C coupling <1 nS - 0.1 nS
15 16 Qi Rfeedback 24 to 26 nS - 25 nS
2 chassis LEDa Rforward 8 to 9 MΩ - 0.8 MΩ
2 chassis LEDa Vforward 1.0 to 1.1 V - 1.090 V
chassis 2 LEDa Rreverse <1 nS - 0.1 nS
chassis 4 LEDb Rforward 8 to 9 MΩ - 52 kΩ
chassis 4 LEDb Vforward 1.0 to 1.1 V - 0.782 V
4 chassis LEDb Rreverse <1 nS - 59 kΩ
6 chassis LEDc Rforward 8 to 9 MΩ - 0.79 MΩ
6 chassis LEDc Vforward 1.0 to 1.1 V - 1.090 V
chassis 6 LEDc Rreverse <1 nS - 0.1 nS
chassis 8 LEDd Rforward 8 to 9 MΩ - 38 kΩ
chassis 8 LEDd Vforward 1.0 to 1.1 V - 0.78 V
chassis 8 LEDd Rreverse <1 nS - 37 kΩ
All pins chassis isolation <1.0nS - <1 nS
DIB 4 Face 2 Side Coax ZB1-6
+lead - lead signal typical prev. measured
11 14 Det cont, Rbias 12 to 13 nS - 13 nS
12 11 Qo C coupling <1 nS - 0.2 nS
12 13 Qo Rfeedback 24 to 26 nS - 26 nS
15 14 Qi C coupling <1 nS - 0.3 nS
15 16 Qi Rfeedback 24 to 26 nS - 26 nS
All pins chassis isolation <1.0nS - <1 nS
644

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