sPHENIX discussion of the superconducting solenoid

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

Hi Roberto,

 

Thanks for your estimation.  Your calculation of 2.8 mm is about 0.11 inches, close to what we saw ~0.116 to ~0.137 inches.

 

Just in case : when I said “I wonder what’s wrong ?”, I was talking about what’s wrong with the linear pot. 4 which suddenly dropped

to readings of 0, from the last reading of 0.125 inches.

 

Kin

 

From: Than, Yatming (Roberto)
Sent: Tuesday, March 01, 2016 8:41 PM
To: Yip, Kin <kinyip AT bnl.gov>; sphenix-magnet-l AT lists.bnl.gov
Subject: RE: 227 K linear-pot. 4 read 0 (broke?)

 

3.5 m length

About 14 mm total contraction, ~0.4% overall

or about 7 mm each side.

 

Roughly 40% contracted, so 5.6 mm total or 2.8 mm each side.

 

Roberto

 

 

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Yip, Kin
Sent: Tuesday, March 01, 2016 8:04 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] 227 K linear-pot. 4 read 0 (broke?)

 

Hi,

 

While the temperature now got down to about 227 K, I went to check on the two DAQ systems in Bldg. 912 this evening.   I’ve found that

since Feb. 28 (Sunday) 4:24:26 am, linear-pot. 4 has suddenly dropped to 0 (or 0.0001).   The other pots read ~<0.1 inches and the

differences for pots 1-3 are ~0.137, 0.121 and 0.116 inches.   I wonder what’s wrong ??

 

You may see the plot :  linear-pot 2016-3-1 6 pm.jpg

 

No such thing (as far as I can see) for the strain gauges.   I plot the last 4 strains in strain “2016-3-1 6pm.jpg”.

 

I attach the relevant DAQ files (from the two systems) :

 

Run 27 Strain Gauge2-18-2016 5 31 PM.xls                  --- converted to strain (in Labview)

Run 27 voltage of Strain Gauge2-18-2016 5 31 PM.xls --- raw voltage without converting to strain

 

02-18-1755.txt (DAQ data containing linear pot).

 

Kin

 

From: Yip, Kin
Sent: Tuesday, March 01, 2016 6:08 PM
To: Yip, Kin <kinyip AT bnl.gov>
Subject: strain