2025/07/28 (Monday)
- Lab in-personnel: Himangshu, Yan
| 0900 | The lab desktop has been shutdown. Restarting temperature monitoring programs. The temperature is still stable at 77K. | ||||
|---|---|---|---|---|---|
| 0920 | The LN tank is empty. Need to refill. and need to refill the cold trap soon! | ||||
| 0940 | Close V8, V1, turn on the 3He dump, and open V3, V5, V2 to pump the mixture back to the dump. (condenser speedivalve and still gatevalve is open.) | ||||
| 0955 | Prepare to pump out IVC. First turn on scroll, open the scroll valve to pump out the IVC, then switch to turbo after 5 min. After switching to turbo, pressure gauge is reading 2e-4 mbar. | ||||
| 1030 | Close V3, 5, 2, 9. Turn off He3 pump. | ||||
| 1035 | turbo pressure gauge is reading 2e-5 mbar. | ||||
| 1250 | MC temperature slowly increased from 77.24 K to 77.29 K. So we expect 0.05K/2 hours, so it will be 12*0.05=~0.6 K tomorrow noon time. | ||||
| 1440 | Refill LN2 dewar from Refill Room Main Line | ||||
| 1503 | Leak Detector on IVC = 1.5e-7 mbar L/s | ||||
| 17xx | Starting electric check. | ||||
| Detector: | S104 | Stripline | 48 | ||
| SC: | none | 77 K | |||
| Face: | 3 | Date | 07/28/2025 | ||
| 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 | 1.631 k | OK |
| SQUID bias B/Ret | 19 | 34 | 1.504 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 | 8.85 k | OK |
| Feedback B/Ret | 2 | 18 | 8.28 k | OK | |
| Feedback C/Ret | 41 | 25 | 11.31 k | OK | |
| Feedback D/Ret | 22 | 6 | 6.31 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | 364, 310, 305, 304, 326 | OK |
| QET B/Ret | 35 | 29, 33, 47, 48 | 71, 64, 122, 55 | OK | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 77, 36, 27, 36 | 10Mohm | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 31, 32, 31, 31 | 10 Mohm | |
| 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 | ||
| 1557 | Electrical check of ZC-70+interposer | ||||
|---|---|---|---|---|---|
| Cooldown checkout sheet (rev C SQUET) | |||||
| Detector: | S104 | Stripline | 41 | ||
| SC: | none | 77 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 | 1.672 k | 13 nS | |
| SQUID bias C/Ret | 8 | 24 | 1.763 k | 11 Mohm, Squid and Feedback is shorted by 9 Mohm | |
| SQUID bias D/Ret | 23 | 39 | 1.996 k | OK | |
| Feedback A/Ret | 37 | 21 | 15 - 25 k | 2 Mohm | OK |
| Feedback B/Ret | 2 | 18 | 9.19 k | Ok | |
| Feedback C/Ret | 41 | 25 | 13.83 k | 28 nS | |
| Feedback D/Ret | 22 | 6 | 16.91 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | OL, 59.4, OL, OL, OL | 11 Mohm |
| QET B/Ret | 35 | 29, 33, 47, 48 | 64.8, 65.1, OL, OL | 11 Mohm | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 85.5, 48.5, OL, OL | 11 Mohm | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 43.8, 44.5, OL, 4 Mohm | Ok | |
| QET A/QET B | 3 | 35 | 1000-3000 | 22.5 kohm | ??? |
| QET A/QET C | 3 | 7 | 16.7 kOhm | ||
| QET A/QET D | 3 | 38 | open | ||
| QET B/QET C | 35 | 7 | 6 kOhm | ??? | |
| QET B/QET D | 35 | 38 | open | ??? | |
| QET C/QET D | 7 | 38 | open | ||
| LED 1 | chassis | 42 | 1.0 - 1.1 V | 1.38 | |
| LED 2 | chassis | 26 | 1.375 | |
|
| Motor Coil Y1 | pBr3 | pBr4 | 129 | ||
| Motor Coil Y2 | pCr3 | pCr4 | 85.6 | ||
| Motor Coil X1 | pAr3 | pAr4 | 80.6 | ||
| Motor Coil X2 | pAr5 | pDr3 | 68.8 | ||
| Xendstop | pAr1 | chassis | open | ||
| Yendstop | pDr4 | chassis | 1.3 Mohm | ||
| 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 | 77 K | |||
| Face: | 2 | Date | 07/28/2025 | ||
| 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 | 1.734 k | OK |
| SQUID bias B/Ret | 19 | 34 | 1.854 k | OK | |
| SQUID bias C/Ret | 8 | 24 | — k | OK | |
| SQUID bias D/Ret | 23 | 39 | 1.904 k | OK | |
| Feedback A/Ret | 37 | 21 | 15 - 25 k | 7.46 k | OK |
| Feedback B/Ret | 2 | 18 | 8.0 k | OK | |
| Feedback C/Ret | 41 | 25 | — k | OK | |
| Feedback D/Ret | 22 | 6 | 8.41 k | OK | |
| QET A/Ret | 3 | 1, 13, 14, 17, 32 | 60 - 80 | 106.1, 45.6, 41.3, 41.5, 42.8 | OK |
| QET B/Ret | 35 | 29, 33, 47, 48 | 91.6, 73.1, 115.6, 69.8 | OK | |
| QET C/Ret | 7 | 5, 9, 10, 28 | 66.3, 41.6, 30.6, 39.1 | 11 Mohm | |
| QET D/Ret | 38 | 36, 40, 43, 44 | 64.2, 39.9, 38.9, 39.2 | 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 | open | ||
| Throughput test procedure, Cold Trap 1: | |||||
- All mixture in dump, LN2 trap 1 is cold, condenser & still valves open (3He pump on - optional)
- Open V9, V13a, V12a+speedivalve, V3. Wait for G1 to be close to G2 (within 100 mbar).
- Close V12a+speedivalve and V3, open V1
- monitor G1
| 1600 | Perform mixture throughput test at MC = 77 K using above procedure with 3He pump on. Let G1 rise to 568 mbar before Step 3, then it falls to ~60 mbar, then rises. Throughput = 43.47 mbar/min. |
|---|---|
| 1620 | Start another round of cryocleaning. |
| 1905 | Collect mix back into the dump and let cold trap slowly warm to room temperature. |