RE: Hall D fixed array - add counters? (fwd)

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

On Wed, 13 Jun 2007, Elton Smith wrote:

Dear Dan and Franz,

the costbook is frozen since rougly a month so the numbers in the costbook
came mainly from the tables I got some time agaon in january from Richard,
The backup information you gave we has upd and downs compared to the
numbers in the costbook. I would suggest the follwoing procedurre.
From the experimental point of view full coverage is of course much nicer,
we cannot make this change right now, but we can easily make it for CD-3
especially if we stay in the budget.

So lets leave the numbers for the mometn untouch for the reviews now, but
aim for a change of this at CD-3.

Is this an acceptable compromise?

thanks elke




> Date: Wed, 13 Jun 2007 11:40:34 -0400 (EDT)
> From: Elton Smith <elton@jlab.org>
> To: Elke Aschenauer <elke@jlab.org>
> Subject: RE: Hall D fixed array - add counters? (fwd)
>
>
> fyi
> ---------- Forwarded message ----------
> Date: Wed, 13 Jun 2007 10:41:03 -0400
> From: kleinf <kleinf@cua.edu>
> To: "'Sober, Daniel I'" <SOBER@cua.edu>, elton@jlab.org
> Subject: RE: Hall D fixed array - add counters?
>
> Dan,
>
> You are right: we should have thought about that. For the moment, I only
> described it as an option (without adding the 2nd row of PMTs in the drawing
> . easy to do!). The total number of counters would then be: 140+100 (full
> coverage).
>
> Another option that we discussed in preparation for last year's tagger
> review: if the current is increased, we cannot use even the high-energy end
> during data taking. The solution for that was: instead of 40 counters for
> 9-11.4 GeV have 80 or 120 counters.
>
> In both cases the main difference in the costs are the PMTs+bases and
> additional manpower for construction+tests.
>
> I don't know whether we still can make such major changes . (of course,
> better now than a year later).
>
> Please tell me whether I should work out the budget for these options.
>
>
>
> Franz
>
>
>
>   _____
>
> From: Sober, Daniel I [mailto:SOBER@cua.edu]
> Sent: Wednesday, June 13, 2007 9:15 AM
> To: Klein, Franz; elton@jlab.org
> Subject: Hall D fixed array - add counters?
>
>
>
> Elton, Franz,
> A fairly obvious question that should have occurred to us several weeks ago:
> Since the new $ quotes for the fixed-array PMT's and scintillators are far
> below the original guesses, shouldn't we increase the number of counters
> from 140 to ~210 in order to get full coverage of the lower-photon-energy
> region?  (or have the "savings" already been committed elesewhere?)
>
> Dan
>
>

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