Re: Collimator layout

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

On Wed, 21 May 2008, Elton Smith wrote:

Actually I think we need a side and a top view to have all dimensions
available easily. As we want to check this drawin than vs the Monte Carlo.

cheers elke


> Date: Wed, 21 May 2008 10:16:11 -0400 (EDT)
> From: Elton Smith <elton@jlab.org>
> To: Richard Jones <richard.t.jones@uconn.edu>
> Cc: Tim Whitlatch <whitey@jlab.org>,
>      Hall D beam working group <halld-tagger@jlab.org>
> Subject: Re: Collimator layout
>
>
> HI Tim,
>
> On the drawing it would also be very useful to show the materials in each
> of the blocks. (Fe, concrete, Pb, etc).
>
> Thanks, 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, 21 May 2008, Richard Jones wrote:
>
> > Tim,
> >
> > Here are some comments on the collimator cave layout views you sent me.
> >  1. The vacuum pipe that carries the photon beam from the tagger hall to the
> >     collimator cave is shown as 5cm in diameter.  The civil plans show a stainless
> >     steel pipe 10 inches in diameter connecting the two halls.  The simplest plan
> >     would simply be to evacuate the entire 10 inch pipe (only rough vacuum is
> >     required) in which case the pipe that enters the cave area should have a diameter
> >     of 25.4cm.
> >  2. The primary collimator should be 30cm long.  In the drawing it looks like only
> >     15cm.
> >  3. The pole gap in the first sweep magnet is nominally 2cm.  This is not shown, and
> >     is subject to change as we refine the specs on the sweeps.
> >  4. The hole through the 200cm iron shielding block is shown at 1cm dimensions.  It
> >     should be a 2cm x 2cm square hole.
> >  5. The hole through the 100cm x 200cm x 200cm concrete shielding block is shown at
> >     1cm dimensions.  It should be a 2cm x 2cm square hole.
> >  6. The secondary collimator is shown as 25cm long, or so.  The length in my geometry
> >     is 50cm, with a circular bore hole diameter of 5mm.
> >  7. The inner dimensions of the cave area in my description were 270cm high  x  450cm
> >     wide.  The lead wall separating the cave from the main hall area was designed
> >     with dimensions 470cm x 270cm to completely cover the opening in the vertical
> >     direction (270cm) and to go 10cm past the left and right inner wall dimensions.
> >     This could be accomplished by a notch in the side walls at the entrance to the
> >     cave.
> > Richard Jones
> >
> >
> >  1. Tim Whitlatch wrote:
> >       Hi Richard,
> >
> >       Slava has dimensioned the collimator layout as supplied in Igor's Autocad
> >       file. There are many dimensions for the shielding sizes as well as the
> >       beamline locations. Please look this over and let me know if this is what
> >       is needed as far as locations and size. There is a top and side view .pdf
> >       attached.
> >
> >       Thanks,
> >
> >             Tim
> >
> >
> >
> >
> >
>
>

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