updated calculation of supermodule positions based on information from engineers.
[u/mrichter/AliRoot.git] / EMCAL / emcal_survey_FIRSTYEAR.txt
CommitLineData
54a4c3a6 1> Title:
2Alignment of the EMCAL Supermodules for year 1
3> Date:
421.05.2010
5> Subdetector:
6EMCAL
7> Report URL:
8https://edms.cern.ch/document/1014917
9> Version:
101
11> General Observations:
12Surveyed points on the EMCAL support rails are the only reliable
13points to use. They are located at the rail ends, and we have a
14relationship between these survey marks and the modules, assuming
15that the detector as built matches the design. The relationship is
16based on a simplified 3D model of the supermodule, which is an 8
17cornered box, where 4 corners coincide with the eta = 0 end of the
18modules and the other 4 corners are the survey marks. After
19entering the positions of the 4 survey marks, the 3D application
20CATIA gives the position of the 4 end module corners and the phi
21variation between 2 adjacent supermodules.
22
23The goal is to convert the points from CATIA to a
24transformation matrix for the center of each virtual (software) SuperModule.
25The virtual supermodules are also 8-cornered boxes, but the
26dimensions are determined differently. The x dimension matches the
27size of the strip modules, the y dimension is determined by the strip
28module size and placement (the angle of the strip module changes the
29position of its top-most edge), and the z length is currently 350.0
30cm, which is approximately 42 cm longer than the active area of the
31physical supermodules. This extra length is a historical artifact from
32the development days of the detector.
33
34Point name format is SMVolumeID_CATIAPointID.
35> Coordinate System:
36ALICEPH
37> Units:
38m
39> Nr Columns:
407
41> Column Names: (choose one)
42Point Name,XPH,YPH,ZPH,Point Type,PrecisionXY(mm),PrecisionZ(mm)
43> Data:
4440960_00 -0.7095 4.3100 0.2155 T 1 2
4540960_01 -0.7140 4.3020 3.2960 T 1 2
4640960_10 0.7285 4.3305 0.2155 T 1 2
4740960_11 0.7220 4.3240 3.2960 T 1 2
4840961_00 0.7285 4.3345 0.2155 T 1 2
4940961_01 0.7350 4.3370 -2.8650 T 1 2
5040961_10 -0.7095 4.3100 0.2155 T 1 2
5140961_11 -0.7050 4.3180 -2.8650 T 1 2
5240962_00 -2.1565 3.7980 0.2195 T 1 2
5340962_01 -2.1630 3.7920 3.2980 T 1 2
5440962_10 -0.8055 4.2965 0.2195 T 1 2
5540962_11 -0.8110 4.2890 3.2980 T 1 2
5640963_00 -0.8055 4.2965 0.2195 T 1 2
5740963_01 -0.8000 4.3040 -2.8590 T 1 2
5840963_10 -2.1565 3.7980 0.2195 T 1 2
5940963_11 -2.1500 3.8040 -2.8590 T 1 2