Do we need to keep the large Helmholtz coil setup? (fwd)

[Elton Smith <elton@jlab.org>]

Hello Friends,

Any comments on needs for the use of a the large helmholtz coils setup?

Cheers, Elton.

Elton Smith
Jefferson Lab
elton@jlab.org
(757) 269-7625

---------- Forwarded message ----------
Date: Thu, 11 Nov 2004 15:21:30 -0500
From: Carl Zorn <carl.zorn@jlab.org>
To: Dave Mack <mack@jlab.org>, Elton Smith <elton@jlab.org>,
     Bogdan Wojtsekhowski <bogdanw@jlab.org>
Subject: Do we need to keep the large Helmholtz coil setup?

Thursday, November 11, 2004

Greetings.   I consider you three as my prime contacts with the Halls
(A, B, C and D).  As you are no doubt aware, there is a movement afoot
to clean out "all the old junk" around the lab - unless it has some
real use.

Back in 1993-94, the Detector Group put to together a large (about 6 ft
cubed) helmholtz coil system to test some 3 inch phototubes for Hall B.
   Drew Weisenberger and Brian Kross were the principal builders of it.
Elton was the P.I. on the project that used of the setup.  An internal
CLAS note (94-008) was published and is available for download
(http://www.jlab.org/Hall-B/notes/clas_notes94.html).   Drew tells me
that there were probably other users but I can't track down any
documentation.  For some years now, the system has been stored in a
Hall B trailer sitting outside the experimental hall.

The device is not capable of field much beyond 20-30 gauss, but the
point was to create a large uniform volume (usefull especially for the
big PMTs).  The "black box" in the centre has a unique gimbaled setup
to allow for 2 degrees of freedom - "pitch" and "roll".  It also has
inputs for a set of pulsed LEDs.  I imagine that the coil setup would
need serious upgrading for larger field tests

As it stands right now, Hall B will be getting rid of it, and Property
Management has told me that there is no extra room for something of
this size.  Any interest in keeping it?


All the best,

..............Carl

carl.zorn@jlab.org
757-269-7449 (office)
757-584-7449 (pager)