<div dir="ltr">Hello all,<div><br></div><div>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.</div>
<div><br></div><div>-Richard J.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Feb 26, 2014 at 2:53 PM, Alexandre Deur <<a href="mailto:deurpam@jlab.org">deurpam@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote">Hello Dan,<br>
<br>
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.<br>
<font color="#888888"><br>
Alexandre<br>
</font><div class="im HOEnZb"><br>
----- Original Message -----<br>
> From: "Daniel Sober" <<a href="mailto:sober@cua.edu">sober@cua.edu</a>><br>
> To: <a href="mailto:halld-tagger@jlab.org">halld-tagger@jlab.org</a><br>
> Sent: Wednesday, February 26, 2014 9:19:17 AM<br>
> Subject: Re: [Halld-tagger] PS magnet mapping requirements<br>
><br>
><br>
</div><div class="HOEnZb"><div class="h5">> Alex,<br>
> If you do rotate some of the probes, remember that very precise<br>
> angular alignment is necessary in order that the horizontal<br>
> components not be swamped by the much larger vertical field. They<br>
> should be tested in the uniform field region (where they should read<br>
> close to zero.)<br>
> Dan<br>
><br>
><br>
> On 2/26/2014 9:06 AM, Alexander Somov wrote:<br>
><br>
><br>
> Hello Richard,<br>
><br>
> As there are 5 hole probes mounted on the mapper (1 cm apart from<br>
> each other), I think that it would make sense to rotate 2 of them to<br>
> measure Bz and Bx just for consistency check. As the mapping<br>
> area is small, I would make the step size 1 cm.<br>
><br>
> If TOSCA agrees well for By, we'll use the whole map from TOSCA.<br>
><br>
> Cheers,<br>
> Alex<br>
><br>
><br>
><br>
> On Wed, 26 Feb 2014, Richard Jones wrote:<br>
><br>
> Alex,<br>
><br>
> The plan looks good. You ask at the bottom of the page whether one<br>
> can<br>
> rotate two of the probes to measure Bx and By. You should be able to<br>
> compute those from a map of Bz only, using the symmetry of the field<br>
> and<br>
> the fact that (del x B) = 0 in the region outside the coils and the<br>
> iron.<br>
> Is that what you want to check?<br>
><br>
> -Richard J.<br>
><br>
><br>
> On Tue, Feb 25, 2014 at 9:26 AM, Alexander Somov <<a href="mailto:somov@jlab.org">somov@jlab.org</a>><br>
> wrote:<br>
><br>
> Hi,<br>
><br>
> I've started putting requirements for mapping<br>
> the PS magnet to<br>
> <a href="https://halldweb1.jlab.org/wiki/index.php/Plan_for_mapping_PS_magnet">https://halldweb1.jlab.org/wiki/index.php/Plan_for_mapping_PS_magnet</a><br>
> Please take a look.<br>
><br>
> Cheers,<br>
> Alex<br>
><br>
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> Daniel Sober<br>
> Professor<br>
> Physics Department<br>
> The Catholic University of America<br>
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