2025/08/01 (Friday)
- Lab in-personnel: Himangshu, Yan, Shubham
| Status | Fridge closed up. ready for LN2 transfer |
|---|---|
| 0950 | Cold trap warmed up overnight. Saw ~1 mbar inpurity. Pump out the cold trap. |
| 1000 | Flush main bath with Helium. |
| 1020 | refill cold trap. |
| 1050 | Flush bath and pot with Helium. |
| 1100 | Overpressurize bath and pot to 2 psi + atm (I think this is the highest we can do) |
| 1130 | introduce two tube lengths of exchange gas. MXP gauge is reading 2 torr. |
| 1200 | start LN transfer. |
| 1220 | the valve on the tank has a loose cap. LN is popping out. stopped transfer. |
| 1250 | Fixed the loose cap . restarted LN transfer. |
| 1300 | MC(Cernox) = 285.4K, still = 289.7 K |
| 1300 | throughput test: about 10 mBar/min |
| 1340 | MC(Cernox) = 187.6K, still = 166.8K |
| 1346 | MC(Cernox) = 176.6K, still = 141K |
| 1346 | throughput test: about 25 mBar/min |
| 1440 | MC(Cernox) = 113.4 K, still = 77.6 K |
| 1446 | throughput test: about 55 mBar/min |
| 1454 | Put Ping-pong cap on MB exhaust port. should take about 3 hours to reach 77 K. Mix is still circulating. |
| 1600 | MC(Cernox) = 86.6 K, still = 70.7 K |
| 1600 | throughput test: about 60 mBar/min |
| 1605 | Collect mix back to dump by closing V8 and then slowly opening V5. VT is open (slightly), V2 is open. |
| 1830 | MC(Cernox) = 77.6 K, still = 69.1 K |
| 1830 | Finished collecting mix back to dump. Close all valve (including VT). |
| 1830 | Starting electric check. | ||||
|---|---|---|---|---|---|
| Detector: | S104 | Stripline | 48 | ||
| SC: | none | 77.6 K | |||
| Face: | 3 | Date | 08/01/2025 | ||
| SQUET: | ZC-39 | Cable | 1 | ||
| Signal | Pos. lead | Gnd lead | Nominal | Actual | Chassis |
| (Gnd lead) | |||||
| Nominal: | |||||
| < 0.1 nS | |||||
| SQUID bias A/Ret | 4 | 20 | 3 - 5 k | 1.628 k | OK |
| SQUID bias B/Ret | 19 | 34 | 1.551 k | OK | |
| SQUID bias C/Ret | 8 | 24 | — k | OK | |
| SQUID bias D/Ret | 23 | 39 | — k | OK | |
| Feedback A/Ret | 37 | 21 | 15 - 25 k | 8.83 k | OK |
| Feedback B/Ret | 2 | 18 | 8.28 k | OK | |
| Feedback C/Ret | 41 | 25 | 900 k ?????? | OK | |
| Feedback D/Ret | 22 | 6 | 6.40 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | 183, 101.3, 96.0, 96.3, 111.5 | OK |
| QET B/Ret | 35 | 29, 33, 47, 48 | 50.9, 50.9, 78.3, 50.8 | OK | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 52.6, 35.3, 25.8, 40.7 | OK | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 39.3, 39.7, 38.6, 39.0 | OK | |
| QET A/QET B | 3 | 35 | 1000-3000 | open | |
| QET A/QET C | 3 | 7 | open | ||
| QET A/QET D | 3 | 38 | open | ||
| QET B/QET C | 35 | 7 | open | ||
| QET B/QET D | 35 | 38 | open | ||
| QET C/QET D | 7 | 38 | 6.1k | ||
| 1940 | Electrical check of ZC-70+interposer | ||||
|---|---|---|---|---|---|
| Cooldown checkout sheet (rev C SQUET) | |||||
| Detector: | S104 | Stripline | 41 | ||
| SC: | none | 77.3 K | |||
| Face: | 5 | Date | 07/28/2025 | ||
| SQUET: | ZC-70 | Cable | 2 | ||
| Signal | Pos. lead | Gnd lead | Nominal | Actual | Chassis |
| (Gnd lead) | |||||
| Nominal: | |||||
| < 0.1 nS | |||||
| SQUID bias A/Ret | 4 | 20 | 3 - 5 k | open | OK |
| SQUID bias B/Ret | 19 | 34 | 1.652 k | OK | |
| SQUID bias C/Ret | 8 | 24 | 1.759 k | OK | |
| SQUID bias D/Ret | 23 | 39 | 2.021 k | OK | |
| Feedback A/Ret | 37 | 21 | 15 - 25 k | 14.57 K | OK |
| Feedback B/Ret | 2 | 18 | 9.17 k | OK | |
| Feedback C/Ret | 41 | 25 | 13.81 k | OK | |
| Feedback D/Ret | 22 | 6 | 16.89 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | OL, | OK |
| QET B/Ret | 35 | 29, 33, 47, 48 | 80.0, 66.4, OL, OL | OK | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 61.8, 47.0, OL, OL | OK | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 50.0, 50.7, OL, OL | Ok | |
| QET A/QET B | 3 | 35 | 1000-3000 | 22.52 kohm | ??? |
| QET A/QET C | 3 | 7 | 16.74 kOhm | ||
| QET A/QET D | 3 | 38 | OL | ||
| QET B/QET C | 35 | 7 | 6 kOhm | ??? | |
| QET B/QET D | 35 | 38 | OL | ??? | |
| QET C/QET D | 7 | 38 | OL | ||
| LED 1 | chassis | 42 | 1.0 - 1.1 V | 1.384 | |
| LED 2 | chassis | 26 | 1.375 | |
|
| Motor Coil Y1 | pBr3 | pBr4 | 99.4 | ||
| Motor Coil Y2 | pCr3 | pCr4 | 84.6 | ||
| Motor Coil X1 | pAr3 | pAr4 | 79.8 | ||
| Motor Coil X2 | pAr5 | pDr3 | 69.0 | ||
| Xendstop | pAr1 | chassis | open | ||
| Yendstop | pDr4 | chassis | 16 kohm | ||
| 1931 | 3rd Electrical check of ZC-13 after connecting to Stripline 43 on Tower Face 2 | ||||
|---|---|---|---|---|---|
| Cooldown checkout sheet (rev C SQUET) | |||||
| Detector: | S104 | Stripline | 43 | ||
| SC: | none | 82 K | |||
| Face: | 2 | Date | 08/01/2025 | ||
| SQUET: | ZC-13 | Cable | 3 | ||
| Signal | Pos. lead | Gnd lead | Nominal | Actual | Chassis |
| (Gnd lead) | |||||
| Nominal: | |||||
| < 0.1 nS | |||||
| SQUID bias A/Ret | 4 | 20 | 3 - 5 k | 1.776 k | OK |
| SQUID bias B/Ret | 19 | 34 | 1.870 k | OK | |
| SQUID bias C/Ret | 8 | 24 | — k | OK | |
| SQUID bias D/Ret | 23 | 39 | 1.941 k | OK | |
| Feedback A/Ret | 37 | 21 | 15 - 25 k | 7.64 k | OK |
| Feedback B/Ret | 2 | 18 | 8.18 k | OK | |
| Feedback C/Ret | 41 | 25 | — k | OK | |
| Feedback D/Ret | 22 | 6 | 8.59 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | 99.3, 43.7, 39.3, 39.6, 42.9 | OK |
| QET B/Ret | 35 | 29, 33, 47, 48 | 42.6, 42.9, 86.9, 42.7 | OK | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 48.8, 39.6, 28.6, 37.0 | OK | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 58.6, 48.2, 47.2, 47.5 | OK | |
| QET A/QET B | 3 | 35 | 1000-3000 | open | |
| QET A/QET C | 3 | 7 | open | ||
| QET A/QET D | 3 | 38 | | ||
| QET B/QET C | 35 | 7 | open | ||
| QET B/QET D | 35 | 38 | open | ||
| QET C/QET D | 7 | 38 | open | ||
| 1950 | Use scroll and then turbo to pump out IVC overnight. |
|---|---|
| 2050 | MC(Cernox) = 77.3 K; still = 70.1 K. |