[Halld-tagger] Fwd: working group meeting at 11:30EDT

[Richard Jones]

Hello,

From the inventory of Hall B, my wish list would be very similar to yours.

   1. aluminum 9e-6 rad.len.
   2. gold 3.3e-5 rad.len.
   3. platinum 1.6e-3 rad.len.

The only difference with your list is that I my thin radiator is a factor 2
thinner than yours.  I think having a broader span in the range of
thicknesses gives us more contrast in any intensity studies that we want to
perform during commissioning.

-Richard J.


On Wed, Oct 16, 2013 at 9:58 AM, Hovanes Egiyan <hovanes.egiyan at gmail.com>wrote:

>  HI,
>
> I attached an Excel file from Steve Christo to this message. It contains
> a list of the radiators that Hall B had. The cells are highlighted with
> color,
> and the explanation for the color is at the bottom of the spreadsheets.
> Some of the foils that are marked "we have" (we is Hall B) may not be
> available now.
> We should have a look at this list and pick what we would like for Hall D
> amorphous
> radiator, and then Steve will check the availability of those foils for
> us.
>
> I think we could use 1.7e-05--Aluminum, 3.3e-04--Gold, 1.6e-03--Platinum.
> 3.3e-04--Gold will probably match the coherent peak intensity from 30um
> diamond
> better than 1.0e-04--Gold.
>
> Stepan from Hall B told me that they abandoned 10^-5 gold foil in favor of
> 10^-5
> aluminum foil because having a micrometer or thinner foil in the target
> holder was painful because of high probability of damaging it in the
> vacuum and
> the difficulty of handling it.
>
> Hovanes.
>
>
>
>
> On 10/14/2013 08:29 AM, Richard Jones wrote:
>
> Photon Beam Working Group,
>
>  Please remember our biweekly conference call that starts this morning at
> 11:30EDT.  A draft agenda has been posted in the usual place on the wiki,
> linked below.
>
>  https://halldweb1.jlab.org/wiki/index.php/BLTWG_Meeting_10/14/2013
>
>  -Richard J.
>
>
>
>
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