Check-list for filling magnet with LHe from QT Dewars Date: …………………
Name (Shift Person): …………………………………………………………….
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Initial Status |
Selected QT Dewar to fill (A? or B?) |
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Did you bring down the Dewar to 3psi? |
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Outside tank pressure (PT8) before filling |
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Magnet LHe level |
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Magnet Pressure |
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Riser location |
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Parallel plates relief pressure |
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TX1 |
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Initial QT Dewar Level |
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Cold-Circulation |
Time of Opening VPC and VJV(A/B) |
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Did you wait for 10 mins? |
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Has TX1 gotten to a plateau below 95K after 10 mins |
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Time of setting the Mag. FC from “AUTO” to “OPEN” |
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Time of Opening the VJVT |
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Did separator relief valve open in the cave? |
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Liquid Transfer |
Time of Closing the VPC |
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Time of switching the Liquefier to Manual |
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Lowest flow to balance the Dewar Pressure around 5psi through SV501(A/B) and SV501(A/B)MQ) |
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Steps to implement when the magnet LHe level reaches ~45%
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Stopping transfer |
Time of Opening VPC, closing both VJVT and VJV(A/B) |
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Time of closing SV501(A/B), changing Dewar pressure to 5psi, and switching the LQ to Liquefier mode |
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Time of switching to “AUTO” and set the automatic mode on Mag. Flow controller |
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Final QT Dewar level |
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Final Magnet level |
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Outside tank pressure (PT8) after filling |
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Did you change the Dewar Set Pressure back to 5psi? |
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Transfer efficiency |
What was the transfer efficiency? |
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