[Sneap] magnet

[Larry Lamm]

Alan,
 I spoke with  a colleague here at ND about your questions, and he 
offers the following suggestions. Good luck,

Larry

> I don't know any description of the precise problem but from the text book 
> below and/or using COSY it is possible to have a reasonable view of what is 
> going on:
>
> Good texts about magnets including double focussing:
> Contribution of Harald Enge in "Focusing of Charged Particles",Academic Press, New York, 1967 Vol 2. Chapter 4.2 
>
> "The Optics of Charged Particle Beams", David C. Carey, Accelerators and 
> storage rings vol. 6. Harwood Academic Publishers
>
>
> For the calculation the effect of mis-alignment I am using COSY Infinity 
> http://bt.pa.msu.edu/index_cosy.htm It is possible to visualize particle 
> trajectories.


alan cooper wrote:
> The host for the 2008 SNEAP annual meeting is the University of Michigan at Ann Arbor.  The meeting dates are: October: 12 - 17, 2008.
> The meeting web link is: http://www-ners.engin.umich.edu/research/Mibl/Sneap/2008.htm
>
> Hi Guys,
> Hope this finds you all well.
> No, I hav'nt retired as yet although my inactivety here may have led 
> some to that conclusion.
>
> I am surveying our lab with the hope of improving alignment of beam 
> lines and equipment.
> In many areas of operation I am finding that the equipment is very 
> forgiving of alignment errors up to 1mm (0.040") in 10 m (34 Ft) 
> although, some experimenters are on their operational limit.
> Our lab buildings have moved millimeters over the last 15 years and we 
> have been compensating for this whenever we have had access to 
> individual lines or equipment.
> The result is that errors have built up in sections, between sections 
> and particularly between buildings over that time. It is hoped that the 
> current survey will lead to overall errors of up to 0.25 mm (0.010") 
> which should be adequate for our purposes.
>
> Now, a question, can anyone point me to a clear description of how a 
> double focussing analysing magnet works. I am particularly interested in 
> the effect of changing the beam entry point, angular and parallel 
> displacement, with respect to the field. Say vector in vs vector out.
>
> Thanks and regards, Al
>
>
>
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>   

-- 
 Larry Lamm, Research Professor
 Nuclear Science Laboratory
   Institute for Structure and Nuclear Astrophysics
 University of Notre Dame
 Lab: 574-631-7716
 Office/Voice Mail: 574-631-7792
 FAX: 574-631-5952
 Email: llamm at nd.edu