[Esr-users] [New Logentry] Hall B Torus Helium Level Control and Level Interlocks

[kashy at jlab.org]

Logentry Text:
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This summer we moved the Superconducting liquid helium probe higher in the TST Lead reservoir. Today I tested the system to see if the issue with backfilling of the recoolers still occurs and at what liquid levels on both level probes LL8210SC and LL8120DP.

Conclusions:
1)  Batch filling still occurs if the thermosiphon return stand pipe in the TST is not covered with LHe. 
2) The SC probe min value before batchfilling occurs 63% and the DP probe is 57%. 
3) We updated the controlled rampdown values for the Torus to <70% on the SC probe and <65% on the DP probe, (note both were 40% which was too low). 
4) We will operate the Torus at 90% Liquid level on the SC probe which is about 70% on the DP probe (the level we operated on last spring).



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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3590235
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