Re: Tagger interface drawing

["Guangliang Yang" <y.guangliang@physics.gla.ac.uk>]

Dear Tim,

    The beam centerline entry pipe has a diameter of 1",  is this a little 
bit small? I know there are concerns about the background caused by the 
electron beam halo. The quadrupole has an aperture of 30 mm in diameter, why 
don't we let the beam pipe match the quadrupole aperture?

Regards

Yang


----- Original Message ----- 
From: "Franz Klein" <fklein@jlab.org>
To: "Tim Whitlatch" <whitey@jlab.org>
Cc: <halld-tagger@jlab.org>
Sent: Thursday, January 10, 2008 3:00 AM
Subject: Re: Tagger interface drawing


>
> Tim,
>
> thanks for producing the drawing - without the placement of the tagger
> package in the hall it's really difficult to imagine the real estate.
> I have 2 concerns (we can discuss that tomorrow):
> a) exit beam pipe (like in Yang's and my files) has still a flange and
> comparatively small pipe (2 1/2"). Let's see whether we can get an oval or
> rectangular form (as proposed in the SoW);
> b) in the SoW I asked for downstream extension of the vacuum chamber to
> prevent backscatterer into the tagger counters.
>
> I have to admit that I haven't touched the (preliminary) 3D model any more
> for 7 months; I should have made the changes there ...
>
> Let's talk tomorrow
>
> Franz
>
> ps. Can I borrow a detailed civil drawing of the collimator cave for 2-3
> weeks?
>
> On Wed, 9 Jan 2008, Tim Whitlatch wrote:
>
>> Hello all,
>>
>> I have placed the tagger interface drawing on the wiki under
>> Engineering. Please look it over and let me know if there are any
>> corrections, comments deletions etc. Then we can distribute it to the
>> bidders on the contract.
>>
>> Best Regards,
>>
>>        Tim
>>
>
> ===============================================================
>                  Franz J. Klein, Associate Professor
>                  CUA, Department of Physics
>                  Washington, DC 20064
>  office: Hannan Hall 210          phone: 202-319-6190
>  or: Jefferson Lab,CC F-243       phone: 757-269-6671
> ---------------------------------------------------------------
>