The OPAL Discussion Forum

[Nicole Neveu <nneveu AT hawk.iit.edu>]

​Hello OPAL experts,

 

I've been using OPAL for the past few months and things are going well. Thanks again for your help with my thermionic gun simulations when I first started. I am currently running V1.2, but plan to switch to V1.4 when it is released. I have a few questions about the differences, ect.

 

1. Does OPAL scale magnetic field maps to the max B value in the file, or max Bz on axis? Pg. 183 of the manual says: "the input field map will be normalized so the peak field magnitude value is equal to ...1 T in the case of magnetic field maps."  I think I see this behavior in my simulations, but appendix C (pg. 203) says scaling is done using max Bz on axis values. Is this a feature that is changed from V1.2 to V1.4?

 

2. Should I use the R or E collimator? When we were emailing about the thermionic gun, it was suggested that I use the R collimator. The manual says E is supported in OPAL-T (pg.98). Is this difference an artifact of using V1.2? 

3. I have been running on a cluster at ANL, and I've been able to run on multiple processors, but not on multiple nodes. I get segmentation faults (11). Is this an artifact of using V1.2 that will be fixed in V1.4, or is it something I am doing wrong?  The cluster uses Torque PBS manager and Maui PBS scheduler, and my run commands look like the following:

mpirun -np 16 opal OTR.in --info 0 | tee OTR.out

Thanks,

Nicole Neveu 

Argonne Wakefield Accelerator

http://www.hep.anl.gov/awa/