[Esr-users] SHMS loss of vacuum

[Steven Lassiter]

HMS magnets have recovered and are full

SHMS transfer line is being pumped on. SHMS magnets are isolated both LN2 and LHe and are on warm return.

SHMS transfer line internal temps:
LHe supply 132K
LHe return 165K
LN2 supply 202K

Steven
________________________________
From: Esr-users <esr-users-bounces at jlab.org> on behalf of Steven Lassiter via Esr-users <esr-users at jlab.org>
Sent: Wednesday, August 30, 2023 8:53 AM
To: Cryo <esr-users at jlab.org>
Subject: [Esr-users] SHMS loss of vacuum

The SHMS transfer line experienced a loss of vacuum yesterday when a pump was removed and the vacuum actuator did not close properly.
The insulating vacuum spoiled and the excessive heat load resulted in the all magnet, HMS and SHMS, losing He and LN2 inventory. Magnets are warming up.

Working to recover the HMS while taking the SHMS off line.
Work in progress.

Steven

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