The OPAL Discussion Forum

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

Hi there,

I have a question about the data outputted from OPAL-CYCL in the 
.afterEachTurn file. How do you define a 'turn'? Given that the code uses a 
timestep, is it simply dumped after a certain number of timesteps (perhaps 
defined by the "STEPSPERTURN" number?), or does it actually ensure that the 
particle has gone through a full 360 degrees of the map?

This is obviously also important to find the time-of-flight per turn in the 
machine to check isochronicity, but it is also crucial in finding a proper 
closed orbit, so you can see the turn-by-turn position of the particle at a 
particular point to map out and minimise the phase space area at that point. 

I also note that the h5 output is done by timestep also. It would seem to 
make more sense if you could output the data at a physical position (as if 
you put a 'screen' in the beamline) to reconstruct the phase space... 

Also, nowhere in the manual does it say what the ".Angle0.dat" and 
".Angle1.dat"  files are which I seem to be getting.

Could someone please clarify?

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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