sPHENIX discussion of the superconducting solenoid

["Mills, James A" <mills AT bnl.gov>]

Hi Kin,

 

I am back to work and finally getting a chance to look at Wuzheng’s analysis.  This looks good, but I do have a question and am not sure how it affects his results.  Do you know what value he is using for the pole tip thickness?  If you recall we had been proposing a change, to go with a 7.5-8” design thickness.  The poles in Wuzheng’s model appear to be the original 12” thick versions.  At least from my old eyes, that it how it appears, though I may not be correct and we should verify this.  Does this have an effect on the quench calculations?

 

Also, is the calculated force uniformly distributed across the face of each end wheel?  And, the question of using 600N versus 905N is a good one.  I suspect we should examine both forces.  What do you think?

 

Thanks,

Jim

 

From: sPHENIX-magnet-l <sphenix-magnet-l-bounces AT lists.bnl.gov> On Behalf Of Yip, Kin
Sent: Wednesday, October 10, 2018 9:29 PM
To: Haggerty, John <haggerty AT bnl.gov>
Cc: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] Forces on the wheels (of TPC)

 

Hi John,

 

Please find here:

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Shared%20Documents/Dr.%20Meng%20Wuzheng's%20calculations/2018-10-10%20Wheel_eddy_curr_force.pptx

 

Wuzheng’s calculation of the forces on the two wheels here.   Are those hundreds of tons manageable  ??

 

{ By the way, Wuzheng doesn’t charge us the time that the Opera has taken to calculate, many days 😊  }

 

Kin

 

From: Meng, Wuzheng
Sent: Wednesday, October 10, 2018 9:24 PM
To: Yip, Kin <kinyip AT bnl.gov>
Subject: RE: Modified power point file

 

Hi,

 

Thanks for your time!

 

Wuzheng

 

From: Yip, Kin
Sent: Wednesday, October 10, 2018 9:22 PM
To: Meng, Wuzheng <meng AT bnl.gov>
Subject: RE: Modified power point file

 

Hi,

 

Looks good !  Thanks !  … I’ll send it to the sPHENIX Magnet mailing list …

 

Kin

 

From: Meng, Wuzheng
Sent: Wednesday, October 10, 2018 8:08 PM
To: Yip, Kin <kinyip AT bnl.gov>
Subject: Modified power point file

 

Kin,

I modified page 4 and 6. I keep the same file name.

How is the new one?

Wuzheng