[Tpe] PS alignment

[Larry Weinstein]

Dear Dave and Doug,

Your email clarifies things.
  1) we want the PS magnet carefully aligned
  2) we want the photon blocker carefully aligned
  3) I am much less worried about the alignment of the lepton blockers.  
I assume that the most they can be off by is 5 mm.  That is acceptable.

- Larry

David Kashy wrote:
> Brian etal,
>
> Nominally the center of the vacuum box in height is the center of the
> beam, but if you need 1-2mm or better you should have this verified.
> Yesterday while discussing the alignment plans with the survey team I
> found that they are aligning the PS magnet steel. I do not think the
> vacuum box is perfectly centered in the magnet. Thus the inside edges of
> the vacuum box will not be the same horizontal distance from the beam.
> This will effect the distribution of the particles left and right...
> would it be better to have the box centered?
>
> They do know that they have to center the photon blocker on the beam.
> The lepton blocker is not adjustable since it was designed to be a close
> fit to the inside of the box. Thus it will match the offset of the
> vacuum box. I've asked that the survey group check the vacuum box
> alignment relative to the magnet so we have an idea about the size of
> the potential problem.
>
> I see no problem with you mounting your luminosity monitors to the
> lepton blocker frame on the upstream edge. Just work with Doug and Joe
> to get it done.
>
> Dave
>
>
>
> On 11/17/2010 4:25 PM, Brian A Raue wrote:
>    
>> Hi Dave,
>>      I have, until now, dropped the ball on mounting for the quartz
>> beam luminosity monitor detectors.  These go on each side of the beam
>> a look at the low energy waste (<0.5 GeV) part of the lepton beams.
>>      A good place to put these at the front edge of the PS vacuum box.
>> I think we should be able to put them on the lip of the lepton beam
>> blocker about 6" from beam center.  They need to be centered
>> vertically so we probably need a couple of small blocks attached to
>> the blocker box with their top sides 0.5 cm from the beam center (the
>> quartz crystals are 1 cm high).
>>      If it is okay to put them there, I design and make the blocks.  I
>> just need to know the distance from the floor of the blocker box to
>> beam height.
>>
>> Brian
>>      
>
>
>    

-- 
				Sincerely,
				Larry

-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 5809 (fax)
weinstein at odu.edu
http://www.physics.odu.edu/~weinstei