[Shms_users] 3rd-Arm Clearance in Hall-C at 12 GeV

[Howard Fenker (w)]

Renderings focusing on the space between the HMS and the SHMS have now
been posted on the Hall-C Document Database.  Direct link HERE 
<https://hallcweb.jlab.org/doc-private/ShowDocument?docid=692>.

Howard Fenker
> SHMS Colleagues,
>
> If you are imagining an experiment in Hall-C that will use a detector 
> system
> other than the HMS or SHMS, you should be aware that the floor space with
> an unobstructed view of the experimental target will be more limited 
> than it
> has been in the pre-12GeV era.  See the figures posted HERE 
> <https://hallcweb.jlab.org/doc-private/ShowDocument?docid=691>. 
> (Username 12gev,
> Password makeshms )
>
> File #1 shows, in two shades of green,  the "large" scattering angles 
> which are not
> shadowed by components of the SHMS when it is 'parked' at its most 
> forward angle.
> Thanks go to Charles Perdrisat, whose suggestion led to a redesign of 
> the SHMS
> structure in order to extend this region down to as low as about 50 
> degrees.
> (Previously, the minimum scattering angle was about 90 degrees.)  The 
> largest
> possible scattering angle has not been determined.
>
> File #2 shows the range of "low" scattering angles between the 
> spectrometers:
> from about 5 degrees to about 30 degrees.  Note, however, that placing 
> a large
> apparatus between the two  spectrometers could be difficult or impossible
> because of the heights of the HMS and SHMS.
>
> The angles mentioned above should not be taken as specifications, or even
> promises. This is a work in progress and we will do the best we can. 
> The designs
> will be frozen very soon, however. If you are planning an experiment 
> which
> will be impacted by this, you should discuss it with me promptly.
>
> Best regards,
>     Howard Fenker
>
>
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