sPHENIX discussion of the superconducting solenoid

[John Haggerty <haggerty AT bnl.gov>]

We reviewed the issues involved with moving the solenoid on July 30, and 
I have attached my notes.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
Discussion of transportation preparations for BaBar solenoid to BNL
July 30, 2014

SLAC: Wesley Craddock, Mike Racine
INFN, Genova: Pasquale Fabbricatore
BNL: Paul Kovach, John Haggerty, Don Lynch, Achim Franz

Paul reported on the preparations for the transport.  The transport
would be by air-ride truck the entire trip, the shipper is CAST.  
Resonant frequncy of the load without additional suspension fixtures
would be about 1.5 Hz.  Based on experience with shipping LHC magnets,
adding additional shock absorbing suspension may make things worse, and a 
meaningful analysis beyond what has been done is not possible.  Measuring
it would require a comparable load on the proposed route, so is not
feasible.

Paul showed the drawings for clamping the thermal shield inside the
cryostat.  They are on their way to SLAC, along with the metric screws to
install them.  There was agreement that these should adequately 
support the thermal shield during transport.  The coil is supported by the
axial and radial tie rods.  Wesley and Mike will tighten them a known
number of turns before transport.

There was a recent concern about transporting the valve box, which must
be transported vertically, and so is about the same height as the solenoid
itself.  The leads can be supported at the bottom, but then they
disappear into the piping leading to the valve box itself.  The heavy 
copper leads connect to flex leads inside the valve box.  Opening the
valve box to add additional support at the top is not an option.
Paul is working on something we can attach to the copper leads at the bottom,
and that's probably the best that can be done to restrain them.

After the meeting, Mike Racine sent the schedule for availability
of the solenoid in End Station A:

> I just got the access schedule for the solenoid. It will be mostly
> available from now until Sept. 10. From then on it will be hit and
> miss for access. Some available and some limited.

The valve box is accessible now, indeed there is need to get it out of
the way for work on LSST.

---

My sense of the discussion is that we agree that the solenoid can
be transported once we install the stabilizers for the thermal shield.
The valve box should be moved at the same time, and the best we can do is 
restrain the copper leads at the bottom.  We will have to send someone 
to SLAC to install that, and work with the shipper to pack the crate.
Due to the schedule of operations in End Station A, that needs to be 
either before September 10 or in some short period after that.

John Haggerty