2025/08/04 (Monday)
- Lab in-personnel: Himangshu, Yan
| Status | MC(Cernox)=21.28 K, still = 25.48 K, 1K pot = 15.21 K. Turbo (and LD) pumping on the IVC overnight. MB @ 10% |
|---|---|
| 1000 | valve out turbo. IVC leak rate = 2e-7. |
| 1100 | valve out LD for one hour and see if IVC leak rate jumps back up. |
| 1225 | open the IVC to LD, leak rate jumps to 1e-6, the slowly drops. within one minute, it got to 8e-7. |
| 1235 | MC(Cernox)=21.47 K, still = 25.64 K, 1K pot = 15.23 K. |
| 1235 | disconnected Still and MC heater from lakeshore. temperature started dropping. |
| 1300 | MC(Cernox)=21.49 K, still = 21.11 K, 1K pot = 14.66 K. |
| 1300 | MB LHe level = 7.6%. Should we warm up completely? we should also focus on the IVC leak rate. |
| 1300 | leak rate now at/below 1e-7. |
| 1300 | leak rate now stable at 8e-8. |
| 1320 | MC(Cernox)= 21.44 K, still = 19.47 K, 1K pot = 14.03 K. |
| 1330 | MC(Cernox)= 21.42 K, still = 18.98 K, 1K pot = 13.77 K. leak rate 6.3e-8. |
| 1330 | put mixture into the condenser side and the still side. |
| 1335 | leak rate stable at 6e-8. 1K pot dropped to 12.11 K, then 11.0 K. (why?) still temperature is dropping faster after mix in the line too. |
| 1400 | MC(Cernox)= 21.25 K, still = 16.42 K, 1K pot = 9.17 K. |
| 1405 | introduce He exchange gas. |
| 1405 | did not see significant MC temperature change. Perhaps MB is running out? |
| 1417 | MC(Cernox)= 21.07 K, still = 15.33 K, 1K pot = 8.84 K. |
| 1428 | start LHe transfer. 1K temperature went up from 8.8 K to 10 K - must be the hot fill stick?. MC temperature still stable at 20.86 K. |
| 1436 | 1K pot temperature back to 8.7 K. |
| 1439 | 1K pot temperature drops to 6.5 K, still = 14.6 K. |
| 1443 | MC temperature is still not dropping, added more exchange gas. |
| 1447 | now MC temperature is dropping.. MC(Cernox)= 9.55 K, still = 5.31 K, 1K pot = 4.6 K. Turbo Pumping on the IVC. |
| 1450 | MC(Cernox)= 4.51 K, still = 4.16 K, 1K pot = 4.2 K |
| 1452 | MC(Cernox)= 4.38 K, still = 4.16 K, 1K pot = 3.86 K |
| 1455 | MC(Cernox)= 4.38 K, still = 4.08 K, 1K pot = 3.85 K, and it's stable now? |
| 1457 | MB at 78%. stop LHe filling. |
| 1502 | MC(Cernox)= 4.39 K, still = 4.13 K, 1K pot = 4.22 K, it's rising too fast…. |
| 1507 | MC(Cernox)= 4.35 K, still = 4.10 K, 1K pot = 4.19 K |
| 1510 | Take out fill stick. MB @ 75%. |
| 1520 | MC(Cernox)= 4.34 K, still = 4.05 K, 1K pot = 4.20 K |
| 1522 | MC(Cernox)= 4.34 K, still = 4.05 K, 1K pot = 4.25 K (???) |
| 1524 | MC(Cernox)= 4.35 K, still = 4.05 K, 1K pot = 4.29 K (???) |
| 1525 | IVC leak rate: 4e-4. Pumping IVC with both turbo and LD. |
| 1527 | IVC leak rate: 4.33e-4. Pumping IVC with both turbo and LD. |
| 1533 | MC(Cernox)= 4.36 K, still = 4.07 K, 1K pot = 4.42 K (???), leak rate 3.2e-4 |
| 1536 | MC(Cernox)= 4.36 K, still = 4.08 K, 1K pot = 4.47 K (???), leak rate 3.2e-4 |
| 1538 | MC(Cernox)= 4.36 K, still = 4.08 K, 1K pot = 4.53 K (???), leak rate 3.2e-4 |
| 1557 | MC(Cernox)= 4.39 K, still = 4.14 K, 1K pot = 4.84 K (???), leak rate 1.9e-4 |
| 1600 | MC(Cernox)= 4.39 K, still = 4.15 K, 1K pot = 4.87 K (???), leak rate 1.9e-4 |
| 1630 | MC(Cernox)= 4.42 K, still = 4.26 K, 1K pot = 5.09 K (???), leak rate 1.1e-4 |
| 1650 | MC(Cernox)= 4.43 K, still = 4.31 K, 1K pot = 5.19 K (???), leak rate 9.0e-5 |
| 1740 | MC(Cernox)= 4.53 K, still = 4.59 K (thermometer heated up with the heater wires acting as an antenna…), 1K pot = 5.43 K (???), leak rate 7.6e-5 |
| 1830 | MC(Cernox)= 4.53 K, still = 4.59 K (thermometer heated up with the heater wires acting as an antenna…), 1K pot = 5.65 K (???), leak rate 4.2e-5 |
| 1900 | MC(Cernox)= 4.53 K, still = 4.63 K, 1K pot = 5.74 K (???), leak rate 3.8e-5 |
