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Re: possible pair spectrometer magnets (fwd)
Hi Tim,
At the moment I put it to the position of the 1st
sweeping magnet (right after the 1st collimator).
The position is still not optimized - I need a bit
more time.
Sascha
On Tue, 3 Jun 2008, Tim Whitlatch wrote:
> Hi Sascha,
>
> Will the permanent magnet be between toe collimators or downstream of both?
>
> Tim
>
> Alexander Somov wrote:
> > Hello Tim,
> >
> > I am checking background in the collimator
> > cave now and also studying feasibility of
> > using a single constant sweeping magnet, which
> > is about 3.5 m long (this magnet exists in the
> > JLAB). If this configuration works, we might
> > consider to modify the design in the future.
> >
> > The pair spectrometer will need a bit more space
> > (besides the magnet) for scint. counters and subsequent
> > shielding.
> >
> >
> > Cheers,
> > Sascha
> >
> >
> >
> >
> > On Tue, 3 Jun 2008 whitey@jlab.org wrote:
> >
> >
> >> Good Morning all,
> >>
> >> We are looking at putting the magnet at least partially in the collimator
> >> cave. With previous conversations with civil, it seems there is plenty of
> >> capacity in the collimator cave floor. I will verify this and also shift
> >> the secondary collimator upstream (as well as subsequent shielding) to
> >> accomodate a 1 M magnet.
> >>
> >> Cheers,
> >> Tim
> >>
> >>
> >>
> >>> On Mon, 2 Jun 2008, Richard Jones wrote:
> >>>
> >>> Dear Richard and Jim,
> >>>
> >>> actually, I think before we ask rebecca tim might be the correct person
> >>> to ask as currently the idea is to have the magnet partially integrated in
> >>> the wall between the collimator cave and hall d.
> >>>
> >>> cheers elke
> >>>
> >>>
> >>>
> >>>> Date: Mon, 02 Jun 2008 17:13:04 -0400
> >>>> From: Richard Jones <richard.t.jones@uconn.edu>
> >>>> To: Jim Stewart <jstewart@jlab.org>
> >>>> Cc: Hall D beam working group <halld-tagger@jlab.org>
> >>>> Subject: Re: possible pair spectrometer magnets (fwd)
> >>>>
> >>>> Jim Stewart wrote:
> >>>>
> >>>>> Dear tagger
> >>>>>
> >>>>> While at BNL I went looking for possible magnets for the pair
> >>>>> spectrometer. I found several which look like good candidates.
> >>>>>
> >>>>> The 20x42 looks to be very interesting. It is a C-Magnet with the
> >>>>> following characteristics:
> >>>>> pole width 508mm
> >>>>> pole gap 203mm
> >>>>> pole length 1067mm
> >>>>> Max field 1.85T
> >>>>>
> >>>>> The gap is too large but it would be easy to add plates to the poles
> >>>>>
> >>>> to
> >>>>
> >>>>> reduce this. A C-Magnet has the advantage that on one side of the
> >>>>>
> >>>> magnet
> >>>>
> >>>>> we can measure very low momentum particles. Installing the vacuum
> >>>>>
> >>>> chamber
> >>>>
> >>>>> can also be done without taking the magnet apart.
> >>>>>
> >>>>>
> >>>> I agree that this magnet looks interesting. One thing comes to mind,
> >>>> though. When we gave our total floor load to civil, we did not have
> >>>> something of this magnitude in the plan. It might be worth a trip over
> >>>> to the civil engineer's office and toss out a number like 27 additional
> >>>> tons and see what they say.
> >>>>
> >>>> Richard Jones
> >>>>
> >>>>
> >>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> >>> ) `\ -
> >>> / '. | +
> >>> | `, Elke-Caroline Aschenauer =
> >>> \,_ `-/ -
> >>> ,&&&&&V Jefferson Lab +
> >>> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> >>> ,&&&&&&&&&&; Suite 8 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 -
> >>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >>>
> >>>
> >>>
> >>
> >>
> >
> >
>