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TPC Pad Plane
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  Last modified: 10:35 Thursday 08-JUN-2000

Nominal data on the TPC padplane (See figure: Postscript or GIF) is summarized for convenience, following a short introduction. The basic arrangement of the wires relative to the inner and outer pad rows is shown below schematically (however, the sensitive pads do not actually extend all the way to the ends of the subsectors, and the subsectors are separated by a gap):

Subsector Row Radius
(cm)
Pads Pad 1
fraction
Pad 2
fraction
Anode wires Anode-wire
termination
Notes
Inner 1 60.000 88 0.778 1.000 17 - 19 Card 1 1
" 2 64.800 96 0.652 " 29 - 31 Card 2 2
" 3 69.600 104 0.499 " 41 - 43 Card 3 "
" 4 74.400 112 0.347 0.992 53 - 54 " "
" 5 79.200 118 0.957 1.000 65 - 67 Card 4 "
" 6 84.000 126 0.893 " 77 - 79 " "
" 7 88.800 134 0.802 " 89 - 91 Card 5 "
" 8 93.600 142 0.683 " 101 - 103 Card 6 "
" 9 98.800 150 0.801 " 114 - 116 " "
" 10 104.000 158 0.892 " 127 - 129 Card 7 "
" 11 109.200 166 0.955 " 140 - 142 Cards 7, 8 "
" 12 114.400 174 0.991 " 153 - 155 Card 8 "
" 13 119.600 182 1.000 " 166 - 168 LOAB/ISOR  
 
Outer 14 127.195 98 0.764 1.000 10 - 14 Card 9 2
" 15 129.195 100 0.583 " 15 - 19 " "
" 16 131.195 102 0.383 " 20 - 24 " "
" 17 133.195 104 0.210 0.973 25 - 29 Cards 9, 10 "
" 18 135.195 106 0.089 0.894 30 - 34 Card 10 "
" 19 137.195 " 0.764 1.000 35 - 39 " "
" 20 139.195 108 0.582 " 40 - 44 " "
" 21 141.195 110 0.382 " 45 - 49 Cards 10, 11 "
" 22 143.195 112 0.210 0.972 50 - 54 Card 11 "
" 23 145.195 " 0.893 1.000 55 - 59 " "
" 24 147.195 114 0.763 " 60 - 64 " "
" 25 149.195 116 0.582 " 65 - 69 Cards 11, 12 "
" 26 151.195 118 0.382 " 70 - 74 Card 12 "
" 27 153.195 120 0.209 0.972 75 - 79 " "
" 28 155.195 122 0.088 0.893 80 - 84 " "
" 29 157.195 " 0.762 1.000 85 - 89 Cards 12, 13 "
" 30 159.195 124 0.581 " 90 - 94 Card 13 "
" 31 161.195 126 0.381 " 95 - 99 " "
" 32 163.195 128 0.209 0.972 100 - 104 " "
" 33 165.195 " 0.893 1.000 105 - 109 Cards 13, 14 "
" 34 167.195 130 0.762 " 110 - 114 Card 14 "
" 35 169.195 132 0.580 " 115 - 119 " "
" 36 171.195 134 0.380 " 120 - 124 " "
" 37 173.195 136 0.208 0.972 125 - 129 Cards 14, 15 "
" 38 175.195 138 0.088 0.892 130 - 134 Card 15 "
" 39 177.195 " 0.761 1.000 135 - 139 " "
" 40 179.195 140 0.579 " 140 - 144 " "
" 41 181.195 142 0.379 " 145 - 149 Cards 15, 16 "
" 42 183.195 144 0.208 0.972 150 - 154 Card 16 "
" 43 185.195 " 0.892 1.000 155 - 159 " "
" 44 187.195 " 1.000 " 160 - 164 " "
" 45 189.195 " " " 165 - 169 Card 16, LOAB/OSOR 2, 3

Notes:

  1. MWPC socket 1 was unfilled during Summer 1999 running. In Fall 1999, a (modified FEE) grounding card will be installed, but the socket will eventually be instrumented.

  2. The MWPC cards were not powered during the Summer 1999 test run, so their input impedance was not well-defined: the inputs were, effectively, partway between floating and ground.

  3. Over row 45, the three innermost anode wires feed MWPC 16, while the outer two go to the LOAB. The next three wires also go to the LOAB, making edge effects, per se, negligible at the outer edge of the sector.