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  Belle testbeam at SPS in June 2015  Not logged in ELOG logo
Message ID: 56     Entry time: Mon Jun 8 16:53:13 2015
Author: Benedikt Würkner 
Project: SVD3 (H6B) 
Subject: EUTelescope Fitter not working investigation 
Run Number:  
Events:  
XYPosition:  
Cooling:  
Data: Unknown 

Apparently every problem can be attributed to a misalignment problem. The telescope has troubles with heavily misaligned DUTs. Was resolved by creating different gear-files for each run with pretty precise coordinates of the DUT position calculated for the telescope coordinate system. 

Additionally one has to watch out for misaligned planes of the telescope itself. It was required to allow for more than 2mm offset for the telescope planes behind the DUTs. This can be easily checked by looking at the PreAligner plots in the -hitmaker-histo.root file.

It look something like this:

and not like this:

 

Run number offset value Comment
49 -1  
50 -1 Expected default value. EORE=49401
51 -1 Expected default value. EORE=49400
52 -1 Checked -1 EORE= 49401
53 -1 Checked -1 EORE= 49401
54 -1 Checked -1 EORE= 119401, 
55 -1 Checked -1 EORE= 409388
56 -1 Checked -1 EORE= 49392
57 -1 Checked -1 EORE= 49377
58 -1 Checked -1 EORE= 49397

 

Run Position x-Table x-telescope FW x-telescope BW
49 1 100 -13,7 -16,7
50 2 69,3 17 14
51 3 38,6 47,7 44,7
52 4 130,7 -44,4 -47,4
53 5 30,5 55,8 52,8
54 6 136,8 -50,5 -53,5
55 7 30,5 55,8 52,8
56 8 136,8 -50,5 -53,5
57 9 30,5 55,8 52,8
58 10 136,8 -50,5 -53,5
Attachment 2: bad-alignment.png  29 kB  Uploaded Tue Jun 9 11:52:55 2015  | Hide | Hide all
bad-alignment.png
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