My estimate of N2 leak/outgassing for the Y1 module at LHO. The accumulation took place over 4.8 days.
Total pressure at the end according to the CC gauges was 5e-8 torr and the total RGA ion current was 2e-10 amps yielding 0.004 amps/torr(H2).
Ignoring the gauge factors I get an N2 leak/outgassing rate of 4e-9 tl/sec. There may also be a contribution from CO generated by the CC gauges.
Also, the RGA setup was coupled to the tube at an oring angle valve so
there are a number of small orings in close proximity to the RGA. Kyle did perform a mild bake on this setup. In addition, included in the accumulation
is the LN2 pump at YMID.
I would say we have no measureable air leak on Y1.
The RGA data is shown on a log plot for better visibilty - on a linear plot the curves appear straight.
For Rai and Mike,
Here is the CC gauge data in ascii. Two gauges PT124(first data set in file) and PT243 are recorded.
The times are as follows:
RGA start record at 3/19/2014 13:25 PDT = 20:25 UTC = 2456736.3704
RGA end record at 3/24/2014 9:15 PDT = 16:15 UTC = 2456741.1958
The temperature data is here:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10984
Average temperature was ~50F during the accumulation.