Re: Hall D targets

[Elton Smith <elton@jlab.org>]

Hi Curtis, Rory,

Solid targets have always been planned at least for calibration. See p.4
in http://www.halld.org/cdr_v5/chapter6/chapter6.pdf, although I don't
think we have any detailed designs yet (Tim can comment on the status of
drawings).

He4 targets are possible, but He3 targets are not part of the scope.

Cheers, Elton.



Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton@jlab.org
(757) 269-7625
(757) 269-6331 fax

On Wed, 26 Nov 2008, Curtis A. Meyer wrote:

> Hi Rory -
>
>     the only target that we have physically planned at the moment is
> liquid hydrogen (and probably deuterium). There was interest by some
> groups of using helium, and that would proably also work as well. However,
> our core physics program which will likely run for the first 4-5 years is
> all hydrogen.
>
>     For solid targets, the start counter drives the dimensions of the
> available space. GlueX - doc 992 (from the Wiki) indicates that this
> is 6.5 centimeter radius. The CDC starts at about 9cm radius.
>
>     curtis
> On Tue November 25 2008, Rory Miskimen wrote:
> > Hi Curtis and Richard,
> >
> > I'm sure that Ashot told you that we're rushing to put together a Hall D
> > proposal for the Primakoff eta
> > physics.  I've looked at the Hall D PAC 30 proposal and there's mention
> > of a 30 cm LH2 target, but no
> > details are given.  Will there be provisions for a solid target ladder?
> > Will there be space for a ladder?
> > We would want to run a 12C target, and could bring over the Primex
> > target ladder, if there's
> > space inside the CDC.
> >
> > Do you have any plans for running a liquid helium target in hall D?  I
> > saw no mention of running nuclear
> > targets in the PAC 30 writeup.
> >
> > Thanks in advance for the help.
> > Rory
> >
>
>
>
> --
> Professor Curtis A. Meyer        Department of Physics
> Phone:  (412) 268-2745          Carnegie Mellon University
> Fax:    (412) 681-0648            Pittsburgh PA 15213-3890
> cmeyer@ernest.phys.cmu.edu  http://www.curtismeyer.com/
>