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Issues with Alignment of "transposed" detectors using the KFA #31

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YannickDieter opened this issue Jan 10, 2023 · 1 comment

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YannickDieter commented Jan 10, 2023 •

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Issues in detector alignments of "transposed" detectors were observed with the Kalman Filter Alignment resulting in diverging alignment parameters.

A transposition results into the following possible euler angles ('xyz'):

[-pi, 0, -pi / 2.0]
[pi, 0, -pi / 2.0]
[0, pi, pi / 2.0]
[0, -pi, pi / 2.0]

None of these starting values results into a successful alignment using the KFA.

The proposed solution is either to:

transpose your data before the actual analysis or,
use the regular alignment which might lead to a residual offset in one direction

NB: The problem seems to be a rotation of alpha or beta by +- pi. The Alignment of heavily rotated devices could be confirmed

YannickDieter added help wanted Improvement labels

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YannickDieter commented Nov 13, 2023

@cbespin Can you report your findings here, too?

YannickDieter assigned cbespin

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