We mounted 2 dry pump on the chamber and started pumping at 11h.
Pressure was about 6e-1 mbar around 11h45.
Waiting to switch on the turbo at 1e-1 mbar.
Gailor switch on the turbo during lunch time. We reach 2e-5 mbar, but the vacuum is oscillating. Gailor suspect the gauge.
We added a second gauge, it gave 2E-4, switch to a third one, same reading.
So first gauge to be changed.
we are gradually improving vacuum so we thinks it is plastic releasing gas.
Cooling switch on to -10, blocks are cooling down successfully.
All DSSD, CsI and SiLi works with rather low current (below 0.5uA).
After three day, vacuum level rise to 6 mbar. According to Vincent; this is standard for static vacuum, so no sign of major leak. |