2021/01/12 (Tuesday)
- Lab in-person: Matt
- Virtual partner: Ruiren
| Status | Run 74 prep. 1K Pot pumped out and isolated. Fridge and 4He and LN2 Trap 1 isolated, not pumped out. Cryostat vacuum jacket pumped out. IVC open, tower removed. |
|---|---|
| 1420 | Matt arrives at lab. |
| 1425 | Confirm that one USD1 connection - DIB1qI (pin 12) - is open.  |
| 1425 | Examine wirebond - it's broken at the DIB pad.   |
| 1440 | Take USD1 up to 3rd floor wirebonder lab.  |
| Wirebonder settings: power = 480/475, bond time = 40/30, rise/drop = 50/26 | |
| 1455 | Rebond DIB1qI on first try  |
| 1520 | Electrical checkout on USD1, see below. All cross-channel resistances are similar to previous measurements. |
| DIB1qO | DIB1qI | DIB2qO | DIB2qI | DIB1pin7 |
| q1 | q3 | q2 | q4 | g |
| Charge channels are numbered outer-to-inner | ||||
USD1 electrical checkout, cross-channel resistances:
| q1 | q2 | q3 | q4 | g | chassis | |
|---|---|---|---|---|---|---|
| q1 | - | 21.4 (21.7) (21.5) | 33.1 (35.1) (36.5) | 49.3 (49.8) (49.8) | 14.8 (15.1) (14.8) | open |
| q2 | - | - | 31.2 (31.9) (33.9) | 43.2 (39.0) (39.1) | 11.2 (11.3) (11.2) | open |
| q3 | - | - | - | 58.4 (59.1) (60.5) | 25.8 (26.5) (27.0) | open |
| q4 | - | - | - | - | 38.7 (39.0) (34.8) | open |
| g | - | - | - | - | - | open |
| resistances between four charge channels and ground connection on opposite side |
||||||
| (parantheses) indicate previous measurements from 2018 Feb 26, 2016 May 25 | ||||||
| 1535 | Begin reassembly  |
|---|---|
| 1545 | Matt leaves lab |