sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Hi,

My units were written wrong.  It's ~0.3 inches, not mm !!!

If you take the full cryostat length ~3.849 m,
multiplied by the famous 0.4% => 0.015396 m
=> divided by 2 (for each side)
=> 0.007698 m
=> ~0.303 inches

Thanks for pointing out the unit mistake !

Kin

On 04/07/2016 12:15 PM, Than, Yatming (Roberto) wrote:

I thought we expected  7 mm.

 

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Yip, Kin
Sent: Thursday, April 07, 2016 12:11 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] Linear Pot. during warmup

 

Hi,

 

Somebody asked about it during yesterday’s meeting, I attach the plot of the linear potentiometer during warmup for pot. 1, 2 and 3.

I tried to readjust all the pots. on Mar. 22 (late afternoon) before warming up so that they would have the entire range.  Ray Ceruti

determined that Pot. 4 just didn’t latch to anything or was unreachable and we gave up on it.

 

My attached plots show the movements for pots 1, 2 and 3.   Pots 2 & 3 are on opposite ends, and so are pots 1 & 4.

Pots 2 & 3 rose to about ~0.3 mm as expected. 

 

But pot 1 didn’t rise for a while until ~half way and then rose to just about 0.2 mm.   Is it possible that pot. 4 pulled the pot. 1

or something like that ?! …..

 

Kin