The OPAL Discussion Forum

["Russell, Steve" <srussell AT lanl.gov>]

The 1D and 2D magnetostatic field maps are scaled by the max. abs(Bz)
field value. For a 1D field, this is the same as the max. abs(Bz) field
on axis because of how the field is defined. For the 2D fields, OPAL-t
uses the max. abs(Bz) value in the file (and not necessarily on axis).


Note that the 3DMagnetoStaticH5Block field map (which is not yet
documented) does not scale the field map.



On Tue, 2015-11-17 at 07:02 +0000, Adelmann Andreas (PSI) wrote:
> Hello Nicole 
> 
> 
> > 
> > ​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.
> 
> 
> Yes 1.4 is a bit late :( but we are close :-)
>  
> > 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?
> 
> 
> The behaviour is as described on P. 183 and the description on P 203
> is corrected in the new version of the manual.
> 
> 
> @Steve: can you check please 
> 
> 
> 
> >  
> > 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? 
> 
> 
> In 1.4 you can use both, indeed there was a problem in 1.2.
> 
> 
> > 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
> > 
> > 
> 
> 
> That should work. Are you using the pre-build binaries for the closure
> runs? 
> If you send me the input file I can have a look and check on our
> cluster.
> Also tell me where do you want to have the E-collimator so I can try. 
> Do we have a Dropbox?
> 
> 
> Cheers Andreas