Mu2e Collaboration

Mu2e Document 5484-v1

Mu2e PS Solenoid Helium Relief Simulation with Quench and Loss of Vacuum

Document #:
Document type:
Project Document
Submitted by:
Erik A Voirin
Updated by:
Erik A Voirin
Document Created:
30 Apr 2015, 13:58
Contents Revised:
19 May 2015, 08:17
DB Info Revised:
20 Mar 2017, 16:49
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  • Public document
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Relief simulation results show the maximum pressure during the worst case event of quench and loss of vacuum is 218.3 psia using the relief valves described in the document.

The Mu2e PS solenoid is helium cooled via a helium thermo-siphon with 17 cooling tubes with a 1.25” inner diameter. They are routed circumferentially around each side of the magnet. Saturated liquid helium @ 4.7K is supplied via a 1-1/4" sch10 pipe on the bottom of the magnet. This helium flows upwards around the magnet due to buoyancy from the heat load, then returns back at 7% vapor quality through the 1-1/2" sch10 pipe to the helium reservoir.
The calculations in this document simulate several relief scenarios, including catastrophic loss of vacuum, magnet quench, and both happening simultaneously, since loss of vacuum would also cause a quench of the solenoid. The heat energy from loss of vacuum heats the exterior surfaces of the solenoid, and 35 meter supply and return lines. This heat energy also causes a quench, which adds additional heat energy to the solenoid and helium. The expanding helium must be relieved out the two relief valves, which are set to 100 psig, and are located at the end of the supply and return lines, 35 meters from the solenoid.

Files in Document:
Other Files:
Referenced by:
  • Mu2e-doc-6215: Right bend transfer line - center expansion can LHe relief valve calculations
  • Mu2e-doc-6496: OBSOLETE (see 6683) - TS loss of vacuum and quench calculations for sizing relief valves
  • Mu2e-doc-6683: Mu2e TS Solenoid Helium Relief Simulation with Quench and Loss of Vacuum
  • Mu2e-doc-6242: Distribution box - trapped volume relief valve line sizing
Associated with Events:
held on 19 May 2015 in IBC2nd floor, Headquarters
held on 01 Mar 2016 in Hermitage (ICB 2E)
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