Re: pair space

[Jim Stewart <jstewart@jlab.org>]

Hello Tim
This starts to get a bit uncomfortable. If we go with the 24-8-72 then 
the magnet is 7'-6"= 2.3m long including the field clamp. Hrachya  plans 
to use a 1.5m long vacuum chamber followed immediately with the counter 
array. This means 4.5m are blocked not counting space for working. Here 
I am assuming the radiator is about 1m upstream so that Franz could 
install silicon  in front of the magnet. Could we talk about this at the 
next tagger meeting? I think we are missing a couple meters.

Jim

Tim Whitlatch wrote:
> Hi Jim,
>
> If there is no room to recess the pair spectrometer into the 
> collimator cave, there will be approximately 3 meters total on the 
> upstream platform. This includes the detector, the target and magnet. 
> If there turns out to be room in the collimator hut after Sascha's 
> optimization, we may be able to partially recess the magnet in the 
> cave. Can the associated target be moved upstream of the lead shield 
> wall in the collimator?
>
> Tim
>
> Jim Stewart wrote:
>> Hello Tim
>>
>> As we get closer to selecting a magnet for the pair spectrometer we 
>> will need to know how much space we have in the hall for the 
>> spectrometer. This was on your To-Do list from the tagger meeting 3 
>> weeks ago. Have you gotten anywhere on this?
>>
>> Cheers
>> Jim
>>