sphenix-magnet-l AT lists.bnl.gov

Subject: sPHENIX discussion of the superconducting solenoid

List archive

From: "Yip, Kin" <kinyip AT bnl.gov>
To: "sphenix-magnet-l AT lists.bnl.gov" <sphenix-magnet-l AT lists.bnl.gov>
Subject: [Sphenix-magnet-l] slowness resistance to helium flow in the coaxial line is greater than expected ... 190 K
Date: Fri, 4 Mar 2016 23:16:10 +0000

Hi,

Roberto told me that the slowness of the cool-down (~12-13 K a day) is due to the unexpected high flow “resistance”

in the coaxial line (inherited from BaBar/SLAC). B. Yatauro is starting up the plant again and I just happened to find him

next to the sPHENIX Magnet and chatted a bit… From him, it doesn’t seem that we’ll have any hope of faster cool-down …

But I’ll check with Roberto to understand more …

The temperature now is about to break below 190 K as seen in the plot attached.

Kin

Attachment: 2016-3-4 18-08.JPG
Description: 2016-3-4 18-08.JPG

[Sphenix-magnet-l] slowness resistance to helium flow in the coaxial line is greater than expected ... 190 K, Yip, Kin, 03/04/2016