sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Hi,

I've written down what I've learnt from the archaeology of BaBar documentation about the "Coil (center) and Cryostat" in the
following webpage :

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/SitePages/Parameters.aspx

{ We may add more parameters later. } 

Pasquale, Mike Anerella and (for the cryostat) Paul Kovach have all helped me.   The table shown in the
webpage was initiated by/modified from Pasquale (email communication).

The most peculiar part is about defining the center of the coil --- as Wuzheng has needed.   From the weighted calculations
shown in the webpage, both the magnetic and geometric center is 1756 mm (from the lead end OR the non-lead end).

I've written down where I got the information from (for myself a few years or even a week later ... or perhaps for everybody).

And inside the cryostat, the coil is like moved by about 28.5 mm to the non-lead-end.

Our survey measurement of the cryostat is 3848.88 mm, which is only 0.62 mm shorter than what the as-built drawing shown
(3849.5 mm).

I intend to make this page as "authoritative" as possible.  Please let me know if you find any kind of mistakes/typos.

Kin