[Halld-tagger] Tungsten tube in primary collimator

[Richard Jones]

Dear colleagues,

Yesterday I promised to do a quick MC study to determine what a steel
collimator insert with an aperture adjusted to allow the TAC to run safely
with a 10 nA electron beam and a 2e-5 radlen radiator. The answers are
given in a quick tech note that I link below. I am not done writing it yet,
so if there are plots or results that you would like to see added please
let me know. The bottom line is that steel will work just fine, and it only
needs to be 15 cm long. The inner aperture diameter should be 1.1 mm. In
response to Tim's question, tungsten would be better of course, but steel
seems to work just fine and might be easier to work with.

http://zeus.phys.uconn.edu/halld/collim-1-2016/collim-1-2016.pdf

-Richard Jones

On Thu, Jan 21, 2016 at 7:55 AM, Timothy Whitlatch <whitey at jlab.org> wrote:

> Hi All,
>
> In speaking with the machine shop, we can take a precision ground tungsten
> rod and cut it in half long wise with wire EDM.
> We can then cut a 1.5mm diameter half hole in each half.
>
> Both halves would then be put in the 5mm primary collimator hole together
> giving us a 1.5mm hole (or what diameter is needed).
>
> Tim Whitlatch
> Hall D Engineer
> Jefferson Lab
> 600 KELVIN DR STE 5
> Newport News, VA 23606-4468
> 757-269-5087
>
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