Re: specification for the uniform field region

[Richard Jones <richard.t.jones@uconn.edu>]

Jim,

There should be some uniformity statement outside that region as well, 
in the area between the hatched region and the exit edge for the tagged 
electrons.  I don't think we want a 25% variation anywhere out there 
either, do we?

-Richard Jones


Franz Klein wrote:
>
> Thanks, Jim, for correcting it ... I just looked at your drawing and 
> compared to previous mails, asking myself why requiring a homogeneity 
> better than 'perfect': 3x10^-4 is great! Now we have some real 
> quantification - not only our Mainz-based estimates as in earlier 
> versions.
>
> Thanks
>
> Franz
>
> On Wed, 18 Feb 2009, Jim Stewart wrote:
>
>>
>> Sorry it should read 3 parts in 10,000 not 2 parts in 10,000.  Jim
>>
>>
>> Jim Stewart wrote:
>>> Hello Everyone
>>>
>>> I have attached a sketch for what I propose for the uniform field 
>>> region to use in the specification
>>> for the tagger magnet. The required field uniformity would be 2 
>>> parts in 10,000 for any 2 points in
>>> the hatched area less than 100mm apart and 1% over the whole hatched 
>>> area. I would also like to
>>> require the uniformity +/- 2mm above and below the horizontal plane.
>>>
>>> Please let me know what you think?
>>>
>>> Jim
>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>
>>
>
> ===============================================================
>                   Franz J. Klein, Associate Professor
>                   CUA, Department of Physics
>                   Washington, DC 20064
>   office: Hannan Hall 206          phone: 202-319-6190
>   or: Jefferson Lab,CC F-243       phone: 757-269-6671
> ---------------------------------------------------------------