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Re: [Opal] Simple Test

Chronological Thread 
  • From: Andreas Adelmann <andreas.adelmann AT>
  • To: Karie Badgley < AT>
  • Cc: opal AT
  • Subject: Re: [Opal] Simple Test
  • Date: Fri, 11 Nov 2011 18:23:23 +0100
  • List-archive: <>
  • List-id: The OPAL Discussion Forum <>

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:


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>

Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WLGB/132 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
Thursdays: ETH CAB H 83.1  +41 44 632 36 72
The more exotic, the more abstract the knowledge, 
the more profound will be its consequences.
Leon Lederman 

  • [Opal] Simple Test, Karie Badgley, 11/11/2011
    • Re: [Opal] Simple Test, Andreas Adelmann, 11/11/2011

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