Re: Collimator layout

[Tim Whitlatch <whitey@jlab.org>]

Thanks Richard. I will discuss the target vacuum with Mike Seely. This 
would need an entrance window also.

Tim

Richard Jones wrote:
> Tim Whitlatch wrote:
>> Ok Richard, I believe we have incorporated your comments. The linked 
>> revisions can be used as a baseline if it is correct. You mentioned 
>> three mylar windows. Are you including the target window in the three?
> There is the exit window from the long 12" beam pipe between the 
> tagger hall and where it ends upstream of the primary collimator.  
> Then there is the entrance window where we go back into vacuum just 
> after the secondary collimator.  Finally there is the exit window 
> where we go back briefly to atmosphere before we enter the GlueX 
> target.  One might argue that the vacuum pipe coming out from the 
> collimator cave might couple directly into the target vacuum, but I 
> don't want to complicate the design of the target.  If I were in 
> charge of the target, I would want my vacuum system to be self-contained.
>> We can then start looking at locating the pair spectrometer. Can the 
>> secondary collimator be moved upstream at all?
> Yes, the order and total material in the shielding plan is important, 
> but not their spacing.
>
> -Richard J.
>
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