Numbering Proposal for the ALICE TRD Detector

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Numbering Proposal for the ALICE TRD Detector

• David Emschermann
• Physikalisches Institut
• Universität Heidelberg

David Emschermann
Heidelberg 22/04/2004
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Numbering reference
The numbering of the TRD detector is based on
the conventions given in the following document
ALICE-INT-2003-38 Definition of the ALICE
Coordinate System (available via
EDMS) https//edms.cern.ch/document/406391/2
David Emschermann
Heidelberg 22/04/2004
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ALICE coordinates
The following coordinate system definition is
used in ALICE

• x towards LHC center (horizontal)
• y vertical, upwards
• z parallel to beam direction,
• away from myon arm

David Emschermann
Heidelberg 22/04/2004
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Supermodule numbering
4
5
3
6
2
increasing counter- clockwise, starting above 3
oclock position
7
1
y
0
8
x
looking towards myon arm
9
17
10
16
11
15
12
14
13
David Emschermann
Heidelberg 22/04/2004
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Stack numbering
towards myon arm gt
y
0
3
1
4
2
z
increasing in negative z direction
David Emschermann
Heidelberg 22/04/2004
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Chamber numbering
5
4
3
2
y
1
x
0
radially increasing
David Emschermann
Heidelberg 22/04/2004
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Row numbering
5
4
3
z
2
1
0
increasing in neg z direction to 11/15
David Emschermann
Heidelberg 22/04/2004
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Pad numbering
looking towards interaction vertex from outside
TRD
phi
z
,2,1,0
143, 142, 141,
increasing counter clockwise
David Emschermann
Heidelberg 22/04/2004
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Counting order

• Supermodules
• Stacks in Supermodules
• Chambers in Stacks
• Rows in Chambers
• Pads in Rows

starting with 0, numbers increasing

• counter clockwise
• in neg z direction
• radially

David Emschermann
Heidelberg 22/04/2004
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Numbers
The TRD has a total of 1.181.952 pads. Mapping
numbers SM/Stack/Layer/Row/Pad from
0/0/0/0/0 gt pad no. 0 to 17/4/5/15/143 gt
pad no. 1.181.951 65664 pads in a supermodule
(2xC1/C0/2xC1) 10368/13824 pads per stack
(C0/C1) 1728/2304 pads per chamber (C0/C1) 144
pads per row
David Emschermann
Heidelberg 22/04/2004