The OPAL Discussion Forum

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

Dear Karie if you have a magnetic field, the first thing to do is to check tunes

at fixed energies. That means:

1) create initial conditions for a given energies -> R and Pr

for this you need an other program

2) run OPAL in tune calculation mode (see manual 4.2.1, 4.2.6, 4.2.7, 8.6.4) 

3) compare the tunes.

If you run OPAL with one core you get a file gnu.out. Use gnuplot in the following way:

splot 'gnu.out' u 1:2:3 w d

and you should see your magnetic field.

Cheers Andreas 

On Nov 11, 2011, at 5:10 PM, Karie Badgley wrote:

Hello,

I am wanting to use my magnetic field on a midplane for a cyclotron I
am designing which has two accelerating cavities. I first wanted to
run a simple test of a constant magnetic field to make sure the
particles would travel in a circle. I included the accelerating
cavities in my .in file but set the voltage to zero. The orbits that I
am getting look very odd (in attached image). The have curved portions
but in some regions of the field go straight. I will try to take the
cavities out of the .in file and run again, but I am wondering what is
going wrong?

Karie Badgley
Texas A&M University
<solenoid orbits.jpg>

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Dr. sc. math. Andreas (Andy) Adelmann
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