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Re: thoughts for fdc design backup



On Wed, 26 Mar 2008, Elton Smith wrote:

Dear david and elton,

okay which problem are we trying to solve.
we had a whole review on the technology choice with a very strong
recommendation. so maybe we should play this issue up so high again,
because I thought we retired this issue to a certain extend with the
review in January.

bye elke



> Date: Wed, 26 Mar 2008 14:16:56 -0400 (EDT)
> From: Elton Smith <elton@jlab.org>
> To: davidl@jlab.org
> Cc: halld-tracking-hw@jlab.org
> Subject: thoughts for fdc design backup
>
>
> HI David,
>
> I have tried to outline my thoughts in a "one slide" justification for the
> FDC design selection. It might be useful for backup.
>
> Thoughts?
>
>
> FDC Design Selection:
>
> Requirement: Full coverage of downstream area required by physics (full
> phi-range).
> -> implies the need for large-angle stereo to achieve good position
> resolution in all directions
>    -> creates large number of ghost hits
>
> Solution: Add cathode planes to identify space points locally.
> This is achieved by
> 1. tight timing cuts between cathode planes and hit wire because they see
> the same avalanche.
> 2. Two cathode planes (on either side of the wire) can be used at the hit
> level to identify the matching wire.
>
>
>
> 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
>

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