[Halld-tagger] PS magnet mapping requirements

[Alexandre Deur]

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
> 
> _______________________________________________
> Halld-tagger mailing list Halld-tagger at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tagger
> _______________________________________________
> Halld-tagger mailing list Halld-tagger at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tagger
> 
> --
> Daniel Sober
> Professor
> Physics Department
> The Catholic University of America
> Washington, DC 20064
> Phone: (202) 319-5856, -5315
> E-mail: sober at cua.edu
> 
> _______________________________________________
> Halld-tagger mailing list
> Halld-tagger at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tagger