Kyle valved out the Y1 Module for a few hours today. Tomorrow we will valve out the Y2 module.
Attached is the rate of rise for the two end vacuum gauges.
If I have done the math correctly this translates to a very low outgassing rate with no significant leaks : 1.3 e-6 tl/sec for the 2km module. If it is all H2 this yields ~2e-14 tl/s/cm2
Rai reminded me that the gauge factor for H2 is about twice that for N2. So the outgassing rate stated above should be ~2x higher. Rai reports a number of 4e-14 for the H2 outgassing rate when measured 15 years ago.
An accumulation on Y2 was performed today. See the attached plot.
The results are 2.4 e-7 tl/s for the module which translates to an H2 outgassing rate of ~6.6 tl/s/cm^2 (using a gauge correction of 2 for H2)
This is significantly better than Y1.
Also attached is a plot of the two accumulations plotted on the same time scale.
Correction: the number above should be 6.6 e-15 tl/s/cm^2 for the H2 outgassing.