2018/02/27 (Tuesday)
| 1014 | Begin assembly of USD1 on the tower. |
|---|---|
| 1035 | Mark DIB1 (the dib with pin 7 connected to crystal ground plane) with sharpie. Mount detector with DIB1 → tower face 1, DIB4 → tower face 4. |
| 1050 | Install source plate. Can only get 3 of the threaded rods through easily. Should be fine. Install thermometer on top of source housing using threaded rod. |
 |  |
| Figure 1: Shows the orientation of the source plates before it was installed on the detector. | Figure 2: Shows the placement of the theomometer on the detector. |
USD1 electrical checkout, cross-channel resistances:
| q1 | q2 | q3 | q4 | g | chassis | |
|---|---|---|---|---|---|---|
| q1 | - | 21.7 (21.5) | 35.1 (36.5) | 49.8 (49.8) | 15.1 (14.8) | open |
| q2 | - | - | 31.9 (33.9) | 39.2 (39.1) | 11.3 (11.2) | open |
| q3 | - | - | - | 59.1 (60.5) | 26.5 (27.0) | open |
| q4 | - | - | - | - | 39.0 (34.8) | open |
| g | - | - | - | - | - | open |
| resistances between four charge channels and ground connection on opposite side |
||||||
| (parantheses) indicate previous measurements from 2016 May 25 | ||||||
| 1111 | Detector electrical check is the same as yesterday. |
|---|
| Detector | USD1 | DIB | 1 | |
|---|---|---|---|---|
| side coax | ST-3-3 | date/who: | 2018-02-27/NM&JM | |
| face | 1 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 780kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.105V |
| chassis | 9 | LED1 Rreverse | <1 nS | <0.2nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 781kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.107V |
| chassis | 10 | LED2 Rreverse | <1 nS | <0.8nS |
| 11 | 7 | Qo Rbias | 24 to 26 nS | 26nS |
| 11 | 12 | Qo C coupling | <1 nS | <.2nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | <0.3 nS |
| 14 | 7 | Qi Rbias | 24 to 26 nS | 25nS |
| 14 | 15 | Qi C coupling | <1 nS | <0.2nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 25nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| Detector | USD1 | DIB | 2 | |
|---|---|---|---|---|
| side coax | ST-3-10 | date/who: | 2018-02-27/NM&JM | |
| face | 4 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 770kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.12V |
| chassis | 9 | LED1 Rreverse | <1 nS | <2.0nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 787kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.12V |
| chassis | 10 | LED2 Rreverse | <1 nS | <0.5nS |
| 11 | 7 | Qo Rbias | 24 to 26 nS | <1 nS |
| 11 | 12 | Qo C coupling | <1 nS | <.5nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | <1 nS |
| 14 | 7 | Qi Rbias | 24 to 26 nS | <1 nS |
| 14 | 15 | Qi C coupling | <1 nS | <0.2nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 26nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| 1159 | Crap, it looks like there are a few broken wirebonds on these side coaxes. Remove side coaxes. |
|---|
| Side Coax repairs | |
|---|---|
| 1400 | Set wirebonder to power 480 for copper pads, power 450 for resistor/capacitor pads, time 30/30, bond length 50 drop 10. |
| Spend about 2 hours trying to rethread bonder… tool had something stuck in it, wound up replacing with new one | |
| 1555 | ST-3-9: gave up rewirebonding this one. Fixed qI feedback bonds, but tried replacing all qI bias bonds twice and still it reads open. |
| 1600 | ST-3-3: successfully fixed. All 4 resistors read 25 nS. Fixed any capacitor bonds that looked broken. |
| 1610 | ST-3-10: successfully fixed. All 4 resistors read 25 nS. Fixed any capacitor bonds that looked broken. |
| Detector | USD1 | DIB | 1 | |
|---|---|---|---|---|
| side coax | ST-3-3 | date/who: | 2018-02-27/NM&JM | |
| face | 1 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 780kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.105V |
| chassis | 9 | LED1 Rreverse | <1 nS | <0.2nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 781kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.107V |
| chassis | 10 | LED2 Rreverse | <1 nS | <0.6nS |
| 11 | 7 | Qo Rbias | 24 to 26 nS | 26nS |
| 11 | 12 | Qo C coupling | <1 nS | <.2nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | 26 nS |
| 14 | 7 | Qi Rbias | 24 to 26 nS | 26nS |
| 14 | 15 | Qi C coupling | <1 nS | <0.5nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 26nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| Detector | USD1 | DIB | 2 | |
|---|---|---|---|---|
| side coax | ST-3-10 | date/who: | 2018-02-27/NM&JM | |
| face | 4 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 772kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.12V |
| chassis | 9 | LED1 Rreverse | <1 nS | <2.0nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 790kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.12V |
| chassis | 10 | LED2 Rreverse | <1 nS | <0.5nS |
| 11 | DIB1-7 | Qo Rbias | 24 to 26 nS | 27 nS |
| 11 | 12 | Qo C coupling | <1 nS | <.2nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | 26 nS |
| 14 | DIB-7 | Qi Rbias | 24 to 26 nS | 25 nS |
| 14 | 15 | Qi C coupling | <1 nS | <0.2nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 26nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| Cryo | |
|---|---|
| 1020 | G1 volume had crept up to 35.8 mbar. Pump this out with scroll pump. Pump out Traps 1 and 2, each had crept up to about 2 mbar. |
| 1030 | Fill LN2 cold trap bath |
| 1045 | P1 volume had crept up to 32 mbar. Pump this out too with scroll pump. Down to 0.4 mbar in 25 minutes |
| 1115 | Start cryocleaning mixture through Trap 2 with V6=12.7%. |
| 1120 | Increase V6 → 12.8% to reestablish flow |
| 1130 | Increase V6 → 13.0% to reestablish flow |
| 1145 | Increase V6 → 13.1% to speed up flow, it was pretty low |
| 1210 | Stop cryocleaning, pump mix to dump. |
| 1640 | Remove Trap 2 from bath to let warm up |
| 1650 | Start cryocleaning mixture through Trap 1 with V6 = 12.8% |
| 1715 | Increase V6 → 13.1% to reestablish flow. May have been too much… G2 has risen above G1… but it went no higher than 690 mbar, seems to be relaxing. We'll leave it here. |
| 1745 | Stop cryocleaning, pump mix to dump |
| 1755 | Remove Trap 1 from bath to let warm up. Turn off 3He pump. |