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Hi, Tim/Stepan, What about the field display do you think is wrong vis-a-vis the input field map? I’m in contact with the Geant4 developers on this, so it would be good to know so I can request a fix. Tim, I wasn’t sure what you meant on this. As far as the extent of the field map in -Z, I think that this is something that needs to be done in the conversion from the unfolded single plane set of points to the 3D version. Norman must have that code/script, but I haven’t seen it. This would be good to put into the SVN someplace (sandbox even) so it can be improved. —Jeremy On Mar 10, 2014, at 7:46 AM, Stepan Stepanyan <[log in to unmask]> wrote: > Hi TIm, > > Yes, I suspected that it might be a visualization issue. > The reason I was not sure is that I can see the same as you described > about colors and arrows but simply as 1/2 field with Z=0 not at the > center of the magnet. > > Thanks, Stepan > On 3/10/14 10:36 AM, Nelson, Timothy Knight wrote: >> Hi Stepan, >> >> I think the problems at this point are all due to the visual representation. Colors and arrow lengths are field strength, red being large and green to blue being relatively smaller. I am not sure why the field is cut off on the downstream side, but still well past z=0, in this image but I'm pretty sure that's a problem with the visualization based on the map data I saw that goes into this. >> >> Tim >> >> Sent from my iPad >> >>> On Mar 7, 2014, at 8:48 AM, "Stepan Stepanyan" <[log in to unmask]> wrote: >>> >>> Hello Jeremy, >>> >>> Thanks for implementing the field. I am not sure how much I should trust >>> the visual picture, but the field you have is generated from the middle of >>> the magnet (in Z), so if I am reading the picture correctly, field is >>> shifted >>> relative to the magnet. For completeness the same (X,+Z) distribution must >>> be repeated for (X,-Z) half plane. >>> One of things we have discussed with Norman some time ago is the need >>> for a full 3-D field map (B_x, B_y, B_z) for (X, Y, Z) points. Will be >>> good to >>> know this early on. >>> >>> Regards, Stepan >>> >>>> On 3/6/14 7:28 PM, McCormick, Jeremy I. wrote: >>>> Hi, >>>> >>>> I made a few fixes to SLIC/LCDD for the support of 3D magnetic field maps. The map’s offsets were not being set correctly, and I believe this is now fixed in the HEAD configuration of SLIC in ilcinstall. >>>> >>>> I also added the missing field data to the SVN at hps/java/trunk/fieldmap which is referenced by the detector that includes the field map. >>>> >>>> I was able to get simple visualization working with the 10.00.p01 release of Geant, and the best picture I have so far is this: >>>> >>>> http://www.slac.stanford.edu/~jeremym/hps/field/hps_field7.png >>>> >>>> This visualization tool is at an “alpha” stage of development in that project, unfortunately, but it at least gives some idea that the field has been loaded in successfully. >>>> >>>> That’s the good news. >>>> >>>> The bad news is that the performance is approximately 150x worse when using the 3D field in a Proposal2014 geometry compared to a setup with the simplistic fixed dipole. This compares the HPS-Proposal2014-v5-2pt2 detector with HPS-Proposal2014-v4-fieldmap using the event file egs_tri_2.2gev_0.00125x0_200na_5e5b_30mr_001.stdhep. >>>> >>>> So it appears to me this is not really going to be useable in large scale simulation production until the algorithm for retrieving and interpolating the field values has been significantly optimized. >>>> >>>> —Jeremy >>>> ######################################################################## >>>> Use REPLY-ALL to reply to list >>>> >>>> To unsubscribe from the HPS-SOFTWARE list, click the following link: >>>> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 >>> ######################################################################## >>> Use REPLY-ALL to reply to list >>> >>> To unsubscribe from the HPS-SOFTWARE list, click the following link: >>> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the HPS-SOFTWARE list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1