[Halld-tagger] PS magnet mapping requirements

[Richard Jones]

Hello all,

Just a reminder, you can compute the transverse components from a set of
measurements of the up component only, provided your grid is sufficiently
fine and accurate, which it should be.  I doubt you can measure it as well
as you can compute it from the measured grid of By values.

-Richard J.


On Wed, Feb 26, 2014 at 2:53 PM, Alexandre Deur <deurpam at jlab.org> wrote:

> Hello Dan,
>
> You're right. My thinking is to insert a wedge until we suppress the
> transverse component (when we are in the middle of the magnet). What counts
> will be the departure from that and this will insure that the alignement
> will be good when we map the fringe field.
>
> Alexandre
>
> ----- Original Message -----
> > From: "Daniel Sober" <sober at cua.edu>
> > To: halld-tagger at jlab.org
> > Sent: Wednesday, February 26, 2014 9:19:17 AM
> > Subject: Re: [Halld-tagger] PS magnet mapping requirements
> >
> >
> > Alex,
> > If you do rotate some of the probes, remember that very precise
> > angular alignment is necessary in order that the horizontal
> > components not be swamped by the much larger vertical field. They
> > should be tested in the uniform field region (where they should read
> > close to zero.)
> > Dan
> >
> >
> > On 2/26/2014 9:06 AM, Alexander Somov wrote:
> >
> >
> > Hello Richard,
> >
> > As there are 5 hole probes mounted on the mapper (1 cm apart from
> > each other), I think that it would make sense to rotate 2 of them to
> > measure Bz and Bx just for  consistency check. As the mapping
> > area is small, I would make the step size 1 cm.
> >
> > If TOSCA agrees well for By, we'll use the whole map from TOSCA.
> >
> > Cheers,
> >         Alex
> >
> >
> >
> > On Wed, 26 Feb 2014, Richard Jones wrote:
> >
> > Alex,
> >
> > The plan looks good.  You ask at the bottom of the page whether one
> > can
> > rotate two of the probes to measure Bx and By.  You should be able to
> > compute those from a map of Bz only, using the symmetry of the field
> > and
> > the fact that (del x B) = 0 in the region outside the coils and the
> > iron.
> > Is that what you want to check?
> >
> > -Richard J.
> >
> >
> > On Tue, Feb 25, 2014 at 9:26 AM, Alexander Somov <somov at jlab.org>
> > wrote:
> >
> > Hi,
> >
> > I've started putting requirements for mapping
> > the PS magnet to
> > https://halldweb1.jlab.org/wiki/index.php/Plan_for_mapping_PS_magnet
> > Please take a look.
> >
> > Cheers,
> >         Alex
> >
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> > --
> > Daniel Sober
> > Professor
> > Physics Department
> > The Catholic University of America
> > Washington, DC 20064
> > Phone: (202) 319-5856, -5315
> > E-mail: sober at cua.edu
> >
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