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Alignment for TPC Modules [message #1946] Mon, 19 April 2010 04:06
Messages: 41
Registered: March 2009
Dear all,

we started a discussion on the topic of alignment in the MarlinTPC meeting of April 15, 2010.

My proposal is to have a baseline geometry description (on the basis of best knowledge at the beginning), encoded in the GEAR xml file.
Then a two-step procedure to
  1. determine the misalignment of the individual modules and store it as alignment constants in the conditions database
  2. apply the alignment during runtime in a second execution on hit level

I see several advantages. We directly have the versioning system of the conditions database, as well as the underlying idea of alignment represented in the right category -- as conditions data. We also stay with the already established reconstruction method in two steps.

Any thoughts, comments?

Please note: for the Hit level alignment, I would suggest an additional flag for the hit (see another forum thread for this).


When you have eliminated the impossible, whatever remains, however improbable, must be the truth. (Sir A.C. Doyle in Sign of Four)
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