[Tpe] TPE beamline drawing

[Larry Weinstein]

Dear Dave,

The lepton blocker design looks great.  Thanks!

I have a few comments about the beam line drawings:
On the first page:
  1) the distance between the ID centers and the PS center should be the 
same.  Right now they are 85.87 and 86.15.  This is actually significant.
  2) The two old lepton beam blockers will not be needed if the new 
scheme works.  The 'optional location for lepton beam blocker' at the 
ID2 entrance will definitely not be needed.
  3) At the downstream collimator, the outer collimator ID is 105 mm and 
the inner collimator OD is 96 mm. Does this mean that there is a 9 mm gap?
  4) At the DS collimator, the third item listed is the 
'BPM/Window/Collimator Assembly' with the note 'Collimator not 
installed'.  I hope this means that we will have the BPM and Window 
installed.

On the second page:
The drawing looks fine.  Table A lists the materials in the beamline and 
needs to be updated.  I think that it omits a couple of 25 micron Al 
He-bag windows.  It also lists the target length as 18 rather than 30 cm.

Thanks,
Larry

David Kashy wrote:
> Hi All,
>
> Some updates to the Beamline drawing have been done. Still to discuss is
> the design of the helium bag both near the target and near the calorimeter.
>
> Also do we need a helium bag after the calorimeter. The system we use to
> hold the downstream bag will not work with the calorimeter transporter
> so it would be great if we don't need a downstream bag!
>
> Please do a detail review of at least the first 3 sheets of this
> drawing. If you have comments on sheet 4 that will be great. If someone
> can estimate the amount of shielding materials needed by type that will
> be helpful in staging all materials.
>
> http://www.jlab.org/~zarecky/tpe%20%20file%20directory.htm
>
> We have also been working on the Lepton blocker and our new designer Joe
> Guerra has put some files on his public web site. Please have a look I
> think this will work and work well, but to get it done we need to get
> drawings started ASAP.
> http://www.jlab.org/~jguerra/TPE/
>
>
> All comments welcome.
>
> Dave
>
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>
>    

-- 
				Sincerely,
				Larry

-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 3038 (fax)
weinstein at odu.edu
http://www.lions.odu.edu/~lweinste/