The OPAL Discussion Forum

[Suzie Sheehy <suzie.sheehy AT stfc.ac.uk>]

Hi there,
I am trying to put together a ring which consists of 42 identical cells. 

I have a polar co-ordinate field map which, rather than covering an angle of 
2pi/42, actually it extends beyond the 2pi/42 angle. In this case I need to 
overlap the maps as I go around the full circle of the ring and superimpose 
the fields to get the right overall magnetic structure.

The command in my input file looks like:
ffag: Cyclotron, TYPE="CARBONCYCL", CYHARMON=1, PHIINIT=phi0, PRINIT=pr0, 
RINIT=r0 , SYMMETRY=42.0, RFFREQ=fqrf, FMAPFN="fmap_polar_opalformatted.dat", 
BSCALE=1.0;

I was just wondering if this is correct, and if using 'symmetry' actually 
takes into account overlapping maps to achieve the right geometry or not? 

I can always superimpose the maps myself into a 360 degree map, but was under 
the impression this should work automatically using the 'symmetry' value? 
However, my initial tests indicate my assumption might be wrong!

Thanks,
Suzie


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Suzie Sheehy
Research Fellow and 2010 Brunel Fellow
Royal Commission for the Exhibition of 1851
ASTeC Intense Beams Group
Rutherford Appleton Laboratory (R2, 403)
Didcot, Oxon, OX11 0QX
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+44 (0)1235 446 782
suzie.sheehy AT stfc.ac.uk
www.suziesheehy.co.uk
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