ITE primary and secondary vacuum vessel air to vacuum seals leak check was done this week. One leak has been found on IG1S feed through to entrance module surface seal. It explains what we saw on ITE IG1S readings change(from low E-7 torr to 1Xe-6 torr) on December 22, 2022.  This leak seal will be replaced soon.

2023-Jan -27.  O-ring seal 229# was replaced on ITEIG1S feedthrough to entrance module surface sealing. Also o-ring seal 034# was replaced on the blank off cover beside the feed through to entrance module surface sealing. Since these o-rings are too close to each other. It is better to replace both of them to avoid misreading in leak check.