Re: Tagger interface drawing (fwd)

[Elke-Caroline Aschenauer <elke@jlab.org>]

On Sat, 12 Jan 2008, Elton Smith wrote:

elton,

we have discussed this and richard wanted to update things and than I
organize a meeting. As we had chrtistmas break and a collab week we are
maybe a bit behind.

What was actually the initial question to Jay and the machine group. I did
not see it.

elke



> Date: Sat, 12 Jan 2008 08:39:18 -0500 (EST)
> From: Elton Smith <elton@jlab.org>
> To: Richard Jones <richard.t.jones@uconn.edu>
> Cc: halld-tagger@jlab.org
> Subject: Re: Tagger interface drawing (fwd)
>
>
>
> HI Richard,
>
> It seems like we need to clarify/educate all parties regarding the
> interface between the electron beam and tagger. There is clearly some
> confusion.
>
> Cheers, Elton.
>
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton@jlab.org
> (757) 269-7625
>
> ---------- Forwarded message ----------
> Date: Fri, 11 Jan 2008 13:22:45 -0500
> From: Mark Wiseman <wiseman@jlab.org>
> To: Jay Benesch <benesch@jlab.org>
> Cc: Tim Whitlatch <whitey@jlab.org>, Elton Smith <elton@jlab.org>,
>      Tommy Hiatt <hiatt@jlab.org>
> Subject: Re: Tagger interface drawing (fwd)
>
> I don't understand the connection between the QP quad for the
> accelerator and anything down beam of the radiator.
>
> Mark
>
>
> Jay Benesch wrote:
> >> Currently we can only get 1.125 in o.d. because of the 30mm aperture
> >> quad. Should this grow?
> >
> > Tim,
> >
> > Richard answered the question better than I can.
> >
> > The QP quads for arc 10 and hall D have 1.5" aperture.  They are 30 cm
> > long and have a gradient limit ~2 (kG/cm)*cm, so they have about twice
> > the capacity needed if the number I have is correct.  A prototype is
> > on order.  I don't know if the alignment of the laminations will be
> > good enough to take a 38mm OD tube.  Unfortunately, the metric tubes I
> > found at vendors on line are 38+-0.15mm OD and 35+-0.15mm OD with
> > nothing in between.
> >
> > It would be really helpful if the ID of the QP were increased to
> > accept a 38.15mm OD tube.  39mm?  40mm?  Ask the vendor.
> >
> > Jay
> >
> >
> >> There are two numbers quoted below: 1.125" o.d. (Tim) and 1.25" i.d.
> >> (Jay).  Why are we using the smaller pipe after the radiator, the the
> >> delivery beam pipe has the 1.25 o.d.?
> >>
> >> All of our tagger background simulations to date have been done with
> >> a 1.5" o.d., 1.375" i.d. beam pipe between the radiator and tagger
> >> magnet, through the quad.  I would like to know how much it would
> >> cost to increase the gap spec on the quadrupole magnet to 1.5" vs
> >> repeating our simulations and revisiting the question of tagger
> >> backgrounds with the smaller pipe size.  I could do that if it would
> >> result in substantial savings in the quadrupole cost.
> >>
> >> Richard Jones
> >>
> >> Tim Whitlatch wrote:
> >>> Currently we can only get 1.125 in o.d. because of the 30mm aperture
> >>> quad. Should this grow?
> >>>
> >>> Tim
> >>>
> >>> Elton Smith wrote:
> >>>> Thanks, Elton.
> >>>>
> >>>> Elton Smith
> >>>> Jefferson Lab MS 12H5
> >>>> 12000 Jefferson Ave
> >>>> Suite # 16
> >>>> Newport News, VA 23606
> >>>> elton@jlab.org
> >>>> (757) 269-7625
> >>>>
> >>>> On Thu, 10 Jan 2008, Jay Benesch wrote:
> >>>>
> >>>>
> >>>>> The quads in the hall D line will have 1.375" OD, 1.25" ID beam
> >>>>> pipes.
> >>>>>   The tagger quad beam pipe should be as close to this as possible.
> >>>>>
> >>>>> Jay
> >>>>>
> >>>>>
> >>>>>
>
> --
> ___________________________________________________________
> Mark Wiseman
> MS 4A
> Jefferson Lab
> 12000 Jefferson Ave.
> Newport News, Va. 23606
> 757-269-7289
> Fax 757-269-5279
>
>
>
>

 ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
  )    `\                                                  -
 /    '. |                                                  +
 |       `,              Elke-Caroline Aschenauer            =
  \,_  `-/                                                    -
  ,&&&&&V         Jefferson Lab                                +
 ,&&&&&&&&:       HALL-D 12C / F381       121-A Atlantic Avenue =
,&&&&&&&&&&;      Mailstop: 12H5          Hampton, VA 23664      -
|  |&&&&&&&;\     12000 Jefferson Ave                             +
|  |       :_) _  Newport News, VA 23606  Tel.:  001-757-224-1216  =
|  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
'--'   `-.--.   |                                                    +
   \_    |  |---' Tel.:  001-757-269-5352                             =
     `-._\__/     Fax.:  001-757-269-6331                              -
            +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+