sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi Paul,

 

Please do send me the document once Eric has completed.     I hope for the best for your external leak chasing ☹ 😊

 

Kin

 

From: Orfin, Paul <porfin AT bnl.gov>
Sent: Wednesday, March 9, 2022 3:52 PM
To: Yip, Kin <kinyip AT bnl.gov>
Cc: Than, Yatming (Roberto) <ythan AT bnl.gov>; O'Connor, Eric <eoconnor1 AT bnl.gov>
Subject: sPHENIX solenoid valve box

 

Kin,

 

We completed the 2 repairs and the vacuum leak check indicated no leak internally.  All other suspects were reviewed again as well as a general sweep with no change.  The ultimate vacuum also got lower as a good sign of improvement.  Eric will document all the results from today’s testing. 

 

Unfortunately,  spraying on the outside of the vacuum vessel indicated a leak that did elevate the background.  The level got too high forcing us to stop testing.  We are going to pump overnight to lower the background and try narrow down what could be leaking externally tomorrow morning.

 

Thank you,

Paul Orfin
Cryogenic Systems, Collider-Accelerator Department
Brookhaven National Laboratory
Building 1005S, MS 1005S, Room 217
Upton, NY 11973-5000
Telephone: (631) 344-2899
Fax: (631) 344-3329 
E-mail: porfin AT bnl.gov