Re: Hall D targets

[Elke-Caroline Aschenauer <elke@jlab.org>]

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

Dear all,

Curtis is of course perfectly correct, but we have been discussing to add
a solid target in the incarnation of a foil to the target setup, one
reason being that we think we will need this during commisioning.
There is co design yet. a full ladder becuase of the space requirements as
pointed out already by Curtis will be very difficult.

Can you please elaborate a bit more on what targets you have been
thinking? Is there a drawing/document on the primex target ladder some
engineers could look to and give better feedback.

Thanks and happy thanksgiving
elke

> Date: Wed, 26 Nov 2008 10:26:52 -0500
> From: Curtis A. Meyer <cmeyer@ernest.phys.cmu.edu>
> To: Rory Miskimen <miskimen@physics.umass.edu>
> Cc: Richard Jones <richard.t.jones@uconn.edu>,
>      GlueX Physics <halld-physics@jlab.org>
> Subject: Re: Hall D targets
>
> 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/
>

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