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HPS-SOFTWARE  March 2014

HPS-SOFTWARE March 2014

Subject:

Re: update on HPS 3d mag field

From:

Stepan Stepanyan <[log in to unmask]>

Reply-To:

Software for the Heavy Photon Search Experiment <[log in to unmask]>

Date:

Tue, 11 Mar 2014 07:57:28 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (128 lines)

Hi Norman,

Yes, it was quarter plane. It just that from the picture I do not see
a quarter plane, it is more like a half plane.

Regards, Stepan

On 3/11/14, 3:28 AM, Graf, Norman A. wrote:
> Hello Stepan,
>   The field I released was the quarter plane B_Y at y=0.
> The file was named b18d36.dat.
> Norman
>
> ________________________________________
> From: Stepan Stepanyan [[log in to unmask]]
> Sent: Monday, March 10, 2014 7:25 PM
> To: McCormick, Jeremy I.
> Cc: Nelson, Timothy Knight; hps-software; Graf, Norman A.
> Subject: Re: update on HPS 3d mag field
>
> Jeremy,
>
> I think you are showing only field distribution what is in the file,
> which is
> only half plane (X, Z) for Z<=0. If you let me know which files did you use
> I can comment on X points. In the field maps points were generated for X=0
> to X=25 cm with steps of 1 cm. In addition, Z=0 for the field map should
> have
> correspond to the center of the magnet, which is not in the picture, I
> think.
>
> In the attachment I am sending a zip file which has field maps for
> central field
> of 5000G. Just want to make sure we are talking about the same maps.
>
> Hope this will help.
>
> Regards, Stepan
>
> On 3/10/14, 7:14 PM, McCormick, Jeremy I. wrote:
>> 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
>>>>>>
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>>>>>> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1
>>>>> ########################################################################
>>>>> Use REPLY-ALL to reply to list
>>>>>
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>>>> ########################################################################
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>>>>
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