[Halld-offline] zero field

[David Lawrence]

Hi Matt,

  The output looks right. What happens if you run the bfield2root utility? This should
be built as part of the default sim-recon build. (Source is in $HALLD_HOME/src/programs/Utilities/bfield2root)

Draw the field map in ROOT using:

>bfield2root
>root bfield.root
root [1] Bz_vs_r_vs_z->Draw("colz")

Also, how are you checking that the field map is returning zeros?

Regards,
-David

On Jul 17, 2014, at 9:49 PM, Matthew Shepherd <mashephe at indiana.edu> wrote:

> 
> Hi all,
> 
> Paul and I have been trying to understand why I cannot
> get the example analysis software working and we seem
> to have traced the problem down to the fact that the 
> magnetic field map is returning a zero field.
> 
> Does anyone know how to debug this?  The startup
> of the job suggests all is OK (I think):
> 
> JANA >>URL: sqlite:////home/s4/mashephe/gluex/ccdb.sqlite
> JANA >>context: default
> JANA >>Reading Magnetic field map from Magnets/Solenoid/solenoid_1350_poisson_20
> 130925 ...
> Nx=251 Ny=1 Nz=43 )  at 0x7f46720a0ce0
> Fine-mesh evio file does not exist.
> Constructing the fine-mesh B-field map...
> rmin: 0 rmax: 88.5 dr: 0.1 zmin: 0 zmax: 600 dz: 0.1vg.: 0.0Hz)     
> Number of points in z = 6000
> Number of points in r = 885
> JANA >>10599 entries found (Created Magnetic field map of type DMagneticFieldMap
> 
> I'm using:
> 
> sim-recon-2014-06-30
> ccdb_1.02
> hdds-2.1
> jana_0.7.1p3
> 
> and a ccdb.sqlite file from July 14 (copied from Mark's web page link that day).  I've also
> tried the ccdb.sqlite file from dc2 conditions.
> 
> Matt
> 
> 
> ---------------------------------------------------------------------
> Matthew Shepherd, Associate Professor
> Department of Physics, Indiana University, Swain West 265
> 727 East Third Street, Bloomington, IN 47405
> 
> Office Phone:  +1 812 856 5808
> 
> 
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