[Halld-offline] zero field

[Matthew Shepherd]

Using bfield2root I see something very odd (hope the attachment goes through).

The field only seems nonzero between z=-100 and z=-60

Matt





On Jul 18, 2014, at 7:18 AM, David Lawrence <davidl at jlab.org> wrote:

> 
> 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
>> 
>> 
>> _______________________________________________
>> Halld-offline mailing list
>> Halld-offline at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/halld-offline
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-offline/attachments/20140718/f05a253a/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screen Shot 2014-07-18 at 9.37.44 AM.png
Type: image/png
Size: 18891 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/halld-offline/attachments/20140718/f05a253a/attachment-0002.png>