[Halld-tagger] PS magnet mapping requirements

[Daniel Sober]

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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