TileCal Trigger Towers

TileCal Cell Geometry

The figure (eps) shows the barrel and extended barrel sections of the Tile Calorimeter. Signals from the scintillators are grouped into the rectangular cells shown and each cell is viewed by a pair of photomultipliers (called L and R in the tables below). In the barrel section, cells Bi and Ci are viewed by the same pair of photomultipliers. The cell dimensions are chosen to obtain pseudo-projective towers of nominal width delta-eta = 0.1. The D cells, which normally contain very little energy, have a width delta-eta = 0.2. One PMT is put in each of the two appropriate delta-eta = 0.1 towers. Thus each tower contains three longitudinal segments. The PMT in bold font is also connected to the Muon Output trigger.

BARREL
Eta PMTs by cell PMT
Positions		 Adder
Position
0.0-0.1 A1R A1L BC1R BC1L D0R 5 2 3 4 1 4
0.1-0.2 A2R A2L BC2R BC2L D1L 9 6 7 8 14 7
0.2-0.3 A3R A3L BC3R BC3L D1R 11 10 13 12 15 10
0.3-0.4 A4R A4L BC4R BC4L D2L 19 16 17 18 26 15
0.4-0.5 A5R A5L BC5R BC5L D2R 21 20 23 22 27 21
0.5-0.6 A6R A6L BC6R BC6L D3L 25 24 29 30 40 28
0.6-0.7 A7R A7L BC7R BC7L D3R 31 28 35 36 43 31
0.7-0.8 A8R A8L BC8R BC8L 37 34 41 42 34
0.8-1.0 A9R A9L B9R B9L A10R A10L 39 38 45 46 47 48 42
EXTENDED BARREL
Eta PMTs by cell PMT
Positions		 Adder
Position
0.8-1.0 C10R C10L D4R D4L D5R 5 6 3 4 17 7
1.0-1.1 B11R B11L D5L 9 10 18 10
1.1-1.2 A12R A12L B12R B12L D6R 7 8 15 16 37 21
1.2-1.3 A13R A13L B13R B13L D6L 11 12 23 24 38 15
1.3-1.4 A14R A14L B14R B14L 21 22 33 34 28
1.4-1.6 A15R A15L B15R B15L A16R A16L29 30 43 44 41 42 34
Gap/Crack E1 E2 E3 E4 13 14 1 2

Notes:

  1. The PMT and adder positions correspond to the holes for PMTs in a superdrawer. They number from 1 to 48 starting at the innermost end.
  2. This page reflects the PMT assignments used in the '98 configuration of the barrel-module-0 sector and in subsequent production.
  3. The barrel cell D0 is the same size as the other D cells but spans the centerline of the calorimeter. Cells A1, B1, C1 have one edge on the centerline.
  4. The tower width is delta-eta = 0.2 in the overlap region between barrel and extended barrel and at the high-eta end of the extended barrel.
  5. Since there can be no connections between the barrel and extended barrel, the addition of tower signals from the overlap region (0.8-1.0) must be done off the detector. The LVL1 trigger group has agreed to do this at the input to the LVL1 trigger.
  6. Signals from the "plug extension" or "gap" scintillators (E1,E2) and from the "inter-cryostat" scintillators (E3,E4) are not proposed for the LVL1 since their use is specialized. They will be available for LVL2. They use PMTs 13, 14, 1, 2, respectively.
Last updated: August 2, 2007.

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