Re: Collimator layout

[Elton Smith <elton@jlab.org>]

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
>
>
>
>
>