sPHENIX discussion of the superconducting solenoid

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

Hi,

 

1.

 

Here is a picture that I took at 1:30 pm to day in Bldg. 912:

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Pictures/High%20Field%20Test/Return%20Yoke%20Construction/2017-6-14.jpg

 

Eric Wright (white shirt) and Aaron Allen (yellow shirt) were waiting for the riggers to move the roof steel to the top so that they can

transfer the final set of holes for the roof steel pieces.    After that we can move the Magnet to the base steel.

 

We need to do a few things before moving the Magnet including filling the green sheet, bolting the half-moon steel to the base, etc.

 

Moreover, Ray Ceruti has just told me (just when I was writing this email) that he’s tightened up the radial and axial support rods (to

set the Magnet into the “transport” mode).

 

From Jon Hock, it looks like that we may move the Magnet early next week rather than this Friday ….

 

 

2.  A few other things are also happening.   We still haven’t got the PCB (of the Front-End boards) back and it seems really due to BNL

rather than the vendor (and the offshore company).  Hopefully, we’ll get it next week.

 

I hope to receive from Carl Schultheiss the board assembly requisition any time now …  I’m also urging him to purchase the 100’ voltage

tap cables.

 

 

3.  We’ve got the 3 Fischer connectors (for J10-12 voltage taps).   T. Tallerico gave it to me this morning and I gave it to Sonny Dimaiuta.  [  I took pictures of them and passed them to P. Giannotti and hoped to remind him of what they look like J  But he still couldn’t find it. 

It’s just a last effort …]

 

 

4.  While talking to Sonny, I also discussed with him that we need to take the wires of the 4 linear pot out through the Steel/Extension gap

soon after the Magnet is moved to the base.   Because if we try to do it at the end when the Return Steel box is almost closed, we may

need to do a lot of climbing etc. to take out just 4 wires.

 

 

5.   For the subject of the linear pots,  I’ve just put the linear pot calibration spreadsheet (4 linear functions to convert “volts” to “inches”) here :

 

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Shared%20Documents/100%20A%20Test/Linear%20pot%20calibration.xlsx

 

which was done by Sonny and Piyush Joshi for the low-field test.

 

5.1

 

I’ve also passed the strain gauge analysis formula and my quadratic function for the temperature sensor to convert “ohm” to “K” (Kelvin)

to Winston Pekrul.

 

Winston has actually noticed that we or I didn’t correct the “gauge factor” for temperature in the past.   Though we did have temperature correction to the strain (in polynomial up to T^4), we or I have treated the “gauge factor” in the formula as a constant.     It’s 1% variation over 100 C or K.

 

All the linear pot and strain gauge measurement used to be in the Labview of Piyush Joshi which did both the quench protection as well as

the data-acquisition (DAQ).   Now, the DAQ is done through VME and Winston needs to redo all these so that we will see numbers in the

C-AD Control system, and then we can use “LogView”, “Gpm” etc. to view and analyse.

 

 

6.

 

Achim Franz has given us the Gauss meter that we used in the Low-Field Test.   Winston will help send and store the field measurements (X/Y/Z/total)

into the  C-AD Control system so that we can use the same “LogView” and “Gpm” to view the magnetic field measurements, instead of just looking at the display numbers in the Gauss meter panel J