[u/mrichter/AliRoot.git] / EMCAL / emcal_survey_FIRSTYEAR.txt

> Title: 
Alignment of the EMCAL Supermodules for year 1
> Date: 
12.10.2010
> Subdetector:
EMCAL 
> Report URL: 
https://edms.cern.ch/document/1014917
> Version: 
1 
> General Observations: 
Surveyed points on the EMCAL support rails are the only reliable
points to use.  They are located at the rail ends, and we have a 
relationship between these survey marks and the modules, assuming 
that the detector as built matches the design.  The relationship is
based on a simplified 3D model of the supermodule, which is an 8 
cornered box, where 4 corners coincide with the eta = 0 end of the
modules and the other 4 corners are the survey marks.  After
entering the positions of the 4 survey marks, the 3D application 
CATIA gives the position of the 4 end module corners and the phi 
variation between 2 adjacent supermodules.

The goal is to convert the points from CATIA to a
transformation matrix for the center of each virtual (software) SuperModule.
The virtual supermodules are also 8-cornered boxes, but the
dimensions are determined differently.  The x dimension matches the
size of the strip modules, the y dimension is determined by the strip
module size and placement (the angle of the strip module changes the
position of its top-most edge), and the z length is currently 350.0
cm, which is approximately 42 cm longer than the active area of the
physical supermodules.  This extra length is a historical artifact from
the development days of the detector.

Point name format is SMVolumeID_CATIAPointID.
> Coordinate System:
ALICEPH 
> Units:
m 
> Nr Columns: 
7 
> Column Names: (choose one) 
Point Name,XPH,YPH,ZPH,Point Type,PrecisionXY(mm),PrecisionZ(mm)
> Data: 
40960_00 -0.7148 4.363501 0.0112 T 1 2
40960_01 -0.7148 4.3635 3.0912 T 1 2
40960_10 0.7364 4.363501 0.0112 T 1 2
40960_11 0.7364 4.3635 3.0912 T 1 2
40961_00 0.7364 4.3635 0.0112 T 1 2
40961_01 0.7364 4.363501 -3.0688 T 1 2
40961_10 -0.7148 4.3635 0.0112 T 1 2
40961_11 -0.7148 4.363501 -3.0688 T 1 2
40962_00 -2.17742 3.849361 0.0155 T 1 2
40962_01 -2.17742 3.849360 3.0955 T 1 2
40962_10 -0.81374 4.345701 0.0155 T 1 2
40962_11 -0.81374 4.345700 3.0955 T 1 2
40963_00 -0.81374 4.345700 0.0155 T 1 2
40963_01 -0.81374 4.345701 -3.0645 T 1 2
40963_10 -2.17742 3.849360 0.0155 T 1 2
40963_11 -2.17742 3.849361 -3.0645 T 1 2
Commit	Line	Data
54a4c3a6	1	> Title:
	2	Alignment of the EMCAL Supermodules for year 1
	3	> Date:
a153e485	4	12.10.2010
54a4c3a6	5	> Subdetector:
	6	EMCAL
	7	> Report URL:
	8	https://edms.cern.ch/document/1014917
	9	> Version:
	10	1
	11	> General Observations:
	12	Surveyed points on the EMCAL support rails are the only reliable
	13	points to use. They are located at the rail ends, and we have a
	14	relationship between these survey marks and the modules, assuming
	15	that the detector as built matches the design. The relationship is
	16	based on a simplified 3D model of the supermodule, which is an 8
	17	cornered box, where 4 corners coincide with the eta = 0 end of the
	18	modules and the other 4 corners are the survey marks. After
	19	entering the positions of the 4 survey marks, the 3D application
	20	CATIA gives the position of the 4 end module corners and the phi
	21	variation between 2 adjacent supermodules.
	22
	23	The goal is to convert the points from CATIA to a
	24	transformation matrix for the center of each virtual (software) SuperModule.
	25	The virtual supermodules are also 8-cornered boxes, but the
	26	dimensions are determined differently. The x dimension matches the
	27	size of the strip modules, the y dimension is determined by the strip
	28	module size and placement (the angle of the strip module changes the
	29	position of its top-most edge), and the z length is currently 350.0
	30	cm, which is approximately 42 cm longer than the active area of the
	31	physical supermodules. This extra length is a historical artifact from
	32	the development days of the detector.
	33
	34	Point name format is SMVolumeID_CATIAPointID.
	35	> Coordinate System:
	36	ALICEPH
	37	> Units:
	38	m
	39	> Nr Columns:
	40	7
	41	> Column Names: (choose one)
	42	Point Name,XPH,YPH,ZPH,Point Type,PrecisionXY(mm),PrecisionZ(mm)
	43	> Data:
a153e485	44	40960_00 -0.7148 4.363501 0.0112 T 1 2
	45	40960_01 -0.7148 4.3635 3.0912 T 1 2
	46	40960_10 0.7364 4.363501 0.0112 T 1 2
	47	40960_11 0.7364 4.3635 3.0912 T 1 2
	48	40961_00 0.7364 4.3635 0.0112 T 1 2
	49	40961_01 0.7364 4.363501 -3.0688 T 1 2
	50	40961_10 -0.7148 4.3635 0.0112 T 1 2
	51	40961_11 -0.7148 4.363501 -3.0688 T 1 2
	52	40962_00 -2.17742 3.849361 0.0155 T 1 2
	53	40962_01 -2.17742 3.849360 3.0955 T 1 2
	54	40962_10 -0.81374 4.345701 0.0155 T 1 2
	55	40962_11 -0.81374 4.345700 3.0955 T 1 2
	56	40963_00 -0.81374 4.345700 0.0155 T 1 2
	57	40963_01 -0.81374 4.345701 -3.0645 T 1 2
	58	40963_10 -2.17742 3.849360 0.0155 T 1 2
	59	40963_11 -2.17742 3.849361 -3.0645 T 1 2