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Feature #1879

Track point magnetic field information

Added by Blackmore, Victoria almost 2 years ago. Updated 3 months ago.

Status:
Open
Priority:
Normal
Assignee:
Category:
Tracker
Target version:
-
Start date:
30 September 2016
Due date:
% Done:

0%

Workflow:
New Issue

Description

It would be very useful if it was possible to extract the magnetic field (components and/or total field) used to reconstruct a track. Ideally, I'd like to see this at each tracker station (since we no longer have a uniform field, a 'mean' field measurement isn't suitable). This would allow us to check the assumed field with the field measured by the Hall probes.

(I consider this pretty essential for the analysis of 7469, and would definitely want this information for other field-on analyses)

Possible? Not possible?

History

#1 Updated by Dobbs, Adam about 1 year ago

  • Category set to Tracker
  • Assignee changed from Dobbs, Adam to Kyberd, Paul

Paul, could you take a look at this please?

#2 Updated by Kyberd, Paul about 1 year ago

I'll look to see how this can be done.

#3 Updated by Franchini, Paolo 8 months ago

Has this been done? I think I have seen plots from Victoria with this comparison but I may be wrong.

#4 Updated by Kyberd, Paul 8 months ago

I think that is correct, need to go back and see where this was left

#5 Updated by Kyberd, Paul 8 months ago

Victoria, there were a couple of emails from Chris Rogers and Chris Hunt, on this topic. The last one from Chris Hunt suggested there was a possible answer to the question already available in MAUS, depending on the exact data that you wanted. I did not see an answer to Chris's email. Is the problem solved? or do we need to do some work to close it.

#6 Updated by Franchini, Paolo 3 months ago

We went through this during private discussions at the last workshop.
bin/examples/make_field_map.py can produce a field map and can easily be adapted.

Would this be enough for other users?

#7 Updated by Kyberd, Paul 3 months ago

I'm happy to provide a recipe. Note that if you try to run the script on the geometry which downloads with the analysed run root file then it will not work. There are hardcoded links between the geometry files which mean that it will only work if you reproduce the directory tree of the system on which the original analysis job was run. I looked at putting together a script to modify either then geometry files or to use symbolic links to imitate the tree. But there are at least two different ways the directory links are put in the geometry files and so I decided downloading the geometry directly was easier

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