[Sbs_gems] [New Logentry] GEM gas mixture observation

[adaq at jlab.org]

Logentry Text:
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GEM gas mixture observation: Here I attach a few strip charts to assess our change and where we are at. We are currently stabilizing at a value of about 75.3% readback. I see that in the incident from the turn on of beam back in April, the readback value was around 79% for both BB and SBS. Since then it is clear that the readback value from BB is about 77-78%. Yesterday with Chandan's studies putting the analyzers in parallel on the premix, we observed 77% for both BB and SBS. So I think we are still lower here...but we have increased the ratio a bit. We will continue to monitor closely. We expect that we may be at approximately 73/27 mixture now but less than75/25.<br>


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