[esa-t474] spectrometer uncertainty

[Raymond G. Arnold]

Bino,

Yes, by all means this is a great thing to do.  Glad you are doing 
it.

I started to put together some ideas on chicane design a while back and 
wrote a note (mostly to myself) describing some issues.  Its out of date 
and has some naieve and probably wrong stuff in it, but you may find it 
useful.

     Ray





On Wed, 5 Dec 2007, Bino Maiheu wrote:

> 	Dear All,
>
> I've started some studies concerning the uncertainty and the overall
> layout of the chicane. I wanted to make some plots first of all in the
> style of Karl-Heinz Hiller ( see LC-DET-2004-031 ), but for a 4 magnet
> chicane. I think it's important that we have a think about how to
> calculate the energy in a 4 magnet chicane and that we fix the formalism
> for later studies. So I've started a small writeup, which you can see in
> attachment.
>
> I also included a plots which shows the \Delta E/E versus \Delta B/B,
> distance between the first 2 magnets, distance between the central BPM
> and the second magnet ( as these are the 2 independent variables ! ) and
> the uncertainty on these quantities, for BPM resolutions of 1um, 500,
> 100 and 50 nm. There is more explanation in what I have written so far,
> which are nothing more than some initial thoughts, but I wanted to
> distribute this already now for early feedback.
>
> My plan next is to extrapolate these plots for ILC chicane and
> subsequently use a full Geant 4 simulation with real fieldmaps to
> reproduce and study these curves more in detail as a function of
> magnetic field uniformity and misalignments of BPMs and Magnets.
>
> Questions and sort of drafting of a TODO list are welcome.
>
> Bino
>
>
> --
>                                                  !!!!!
>                                                 ( o o )
>          @ -- Bino Maiheu, Dr. ;) ---------oOO----(_)----OOo------- @
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Raymond G. Arnold                        arnold at slac.stanford.edu
M.S. 42 SLAC                             voice (650) 926-2755
P.O. Box 4349                            fax   (650) 926-2407
Stanford, CA 94309
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