Mu2e Collaboration

Mu2e Document 8992-v4

[OBSOLETE] Mu2e DS Solenoid Helium Relief Simulation - Loss of Vacuum and Quench

Document #:
Document type:
Tech Doc
Submitted by:
Erik A Voirin
Updated by:
Erik A Voirin
Document Created:
07 Mar 2017, 10:00
Contents Revised:
21 Apr 2017, 09:32
DB Info Revised:
12 Jun 2017, 13:56
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Other Versions:
19 Apr 2017, 16:15
13 Apr 2017, 13:51
09 Mar 2017, 13:50

We Perform a Transient Thermal Analysis of the DS Solenoid (Design Pressure = 285 psid) with loss of vacuum and simultaneous magnet quench. We use the heat load to the helium in the solenoid cooling tubes from this thermal model as an input heat load in a fluid simulation of the relieving event, which includes the tubing to the two 100 psi relief valves, and their flow resistance and heat load from loss of vacuum and quench. The Fluid Simulation, done in ANSYS CFX, has been verified by running a test case from "Thermal Hydraulic Simulation of Helium Expulsion" [Source 4] where results are in agreement. For the DS case, we must perform the CFD simulation instead of using literature values, as literature case is too constrained (Its equation requires constant heat load, rupture disks, one tube size, and 2.5K Initial Temperature, none of which we have). Schematic of the Helium/Relief Circuit is shown below:

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Notes and Changes:
Change to No MLI on inner surface of the Solenoid which will mean a much larger heat load on that surface during a loss of vacuum event. This did not make much difference since that heat energy takes too long to diffuse through the low conductivity superconducting coils and G10 wrappings.
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