Lateral X-rays with ESS. Goal : implementation of the lateral mark finding in the ESS software test version available here: http://www.bo.infn.it/opera/scanning/lateralmarks/ Under development : integration with FlexMap3.dll and IdentityMap.dll. Lateral X-ray mark. X. Mark recognition.
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Not possible to be done:
The approach is:
(for the current recommended revision)- use good mechanical references (alignment between references and motion axes better than 0.5 mm over 10 cm)- put the emulsion (and the mechanical references) with the lateral marks outside the vacuum channel as shown below.
test revision >= 42 THREE STRIP SEGMENT ARE SEARCHED: the first segment position is searched between the NOMINAL edge and the NOMINAL mark position along a LINE trajectory if  is found, the next candidate is searched at +1mm from the 
in one of field of view if  is found, the next candidate
is searched at -1 mm from the 
in one of field of viewAt least 2 segments are needed.
The search path of  is from min X,Y to max X,Y
To be modified: from the edge to center and stop when the strip is found