2011/10/04
| 1935 | Background helium leak level 5E-9 mbar l/s. |
|---|---|
| Nitrogen blown out of main bath: some minor fluctuations, but leak rate returns to 5E-9 mbar l/s indicating that there is no leak from main bath to IVC at 77 K. | |
| Mixture cryocleaned and throughput test conducted. Throughput test yields 45 mbar/min. Leak rate remains at 5E-9 mbar l/s. No leak from mixing chamber lines to IVC at 77 K. | |
| Fill N2 cold trap full. Cryoclean mixture overnight. |