[Halld-tagger] PS magnet mapping requirements

[Alexander Somov]

Hello Dan,

Yes, the alignment may be a problem. We'll see what we can do
If it doesn't work, we give it up (it's not essential).

By the way, have you used a 3D hole probe before ?

Cheers,
        Alex


On Wed, 26 Feb 2014, Daniel Sober wrote:

> 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/
>