Re: Hall D targets (fwd from Tim)

[Elton Smith <elton@jlab.org>]

---------- Forwarded message ----------
Date: Wed, 26 Nov 2008 12:25:02 -0500
From: Tim Whitlatch <whitey@jlab.org>
To: Elton Smith <elton@jlab.org>
Cc: Curtis A. Meyer <cmeyer@ernest.phys.cmu.edu>,
     Rory Miskimen <miskimen@physics.umass.edu>,
     Richard Jones <richard.t.jones@uconn.edu>,
     GlueX Physics <halld-physics@jlab.org>
Subject: Re: Hall D targets

Hi Elton,

There are no detail designs as of yet.

Tim

Elton Smith wrote:
> 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/
>>
>>
>
>
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