The OPAL Discussion Forum

[Andreas Adelmann <andreas.adelmann AT psi.ch>]

Hi Andreas,

I'm a little confused about the output when I'm trying to run a bunch  
with space charge.

I'm running for a single turn with a standard KV distribution, where  
particles populate the surface of an ellipsoid in 4D (transver) space.  
In OPAL I've discovered that I should use a BINOMIAL distribution,  
with m=0.0 for x and y and m=1.0 to make the distribution uniform in  
t. In this definition for sigmapx, sigmapy, do I need to use the  
definitions on pp.43 for conversion from what I would call "normal"  
phase space ie. in mrad to betagamma units?

Also, I wanted to check that in H5Root, the variables x,px are  
horizontal, y,py are vertical and z,pz are longitudinal?

The confusion is arising because of pp.43 in the manual, where it says  
that for OPAL-CYCL x,px are horizontal in a "given" co-ordinate  
system, y,py are horizontal in a global co-ordinate system and z,pz  
are vertical in a global co-ordinate system.

Thanks,
Suzie