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Re: interface document first draft
As mentioned 2 weeks ago, I won't be available for the meeting as well.
Thanks to Jim to provide us with such a good draft of the interface
document.
I've only three questions:
a) do we have to provide more information on diamond rotation (i.e.
polarization adjustment ... if we do it wrong we might flush the beamline
(+tagger) with "close-to-channeling" background spread ... I guess it will
be my job to define the procedure how to "wobble" the crystal without
killing the tagger and maybe downstream monitoring equipment).
b) a beam halo of ~1% is rather large for tagger beams (for coh.brems. I
request 10^-4 in Hall B). In general, the halo causes lots of spreads due
to electrons hitting beampipe + vacuum chamber.
c) don't we need 2 pump stations for the long vacuum chamber? The document
talks only about goniometer=upstream beamline, photon beamline and a
single pump for vacuum chamber+pipes to electron beam dump.
Thanks again, Jim! I'll drop by your office on Friday after lunch.
Franz
On Wed, 28 May 2008, Elke-Caroline Aschenauer wrote:
> On Mon, 26 May 2008, Richard Jones wrote:
>
> Dear Richard,
>
> Jim and I are no available tomorrow for a phone meeting, we mentioned this
> the last time. I actually gave the draft version already to rolf for a
> first look he had no objections at all to what was written. We just miss
> still some numbers in the text, which we should be able to fill after the
> latest iterations on the setup in the tager/collimator area.
>
> cheers elke
>
>
>
> > Date: Mon, 26 May 2008 20:14:10 -0400
> > From: Richard Jones <richard.t.jones@uconn.edu>
> > To: Elke-Caroline Aschenauer <elke@jlab.org>
> > Cc: Jim Stewart <jstewart@jlab.org>, halld-tagger@jlab.org
> > Subject: Re: interface document first draft
> >
> > Elke and all,
> >
> > Jim has sent around his first draft of the interface document. Let's make that the focus of our working group
> > meeting this week. The meeting will be 10:00am on Thursday, as usual.
> >
> > Elke has indicated that she wants to show it to Rolf and Mark Wiseman soon as well. That's fine, but we need to
> > go over it in detail ourselves and be sure it reflects our requirements before it gets finalized.
> >
> > Richard Jones
> >
> > Elke-Caroline Aschenauer wrote:
> >
> > On Mon, 19 May 2008, Jim Stewart wrote:
> >
> > Dear all,
> >
> > I take the not receiving any comments as concurrence and pass the document
> > on tuesday on to rolf and mark wisemann.
> >
> > cheers elke
> >
> >
> >
> >
> > Date: Mon, 19 May 2008 13:32:33 -0400 (EDT)
> > From: Jim Stewart <jstewart@jlab.org>
> > To: halld-tagger@jlab.org
> > Subject: interface document first draft
> >
> > Dear Tagger
> >
> > I have placed on my JLAB web page http://www.jlab.org/~jstewart/ my first
> > real version of the machine interface document
> > ICD_Accelerator-Hall... . I have not shown this to the machine yet so be
> > aware they may want major changes. I am sending it around now so everyone
> > can look at it early. If you have comments please give them to me soon.
> >
> > Richard + Franz: Do you want to put a limit on the background in the
> > hodoscope? Could you also tell me what the nominal bdl of the sweeping
> > magnets will be?
> >
> > Thank you
> > Jim
> >
> >
> >
> > ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> > ) `\ -
> > / '. | +
> > | `, Elke-Caroline Aschenauer =
> > \,_ `-/ -
> > ,&&&&&V Jefferson Lab +
> > ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> > ,&&&&&&&&&&; Suite 8 Hampton, VA 23664 -
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> > | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> > '--' `-.--. | +
> > \_ | |---' Tel.: 001-757-269-5352 =
> > `-._\__/ Fax.: 001-757-269-6331 -
> > +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >
> >
> >
> >
> >
>
> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> ) `\ -
> / '. | +
> | `, 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 -
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>
>
===============================================================
Franz J. Klein, Associate Professor
CUA, Department of Physics
Washington, DC 20064
office: Hannan Hall 206 phone: 202-319-6190
or: Jefferson Lab,CC F-243 phone: 757-269-6671
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