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FCal2 Mapping Problem

P.Krieger, TorontoLAr Week, Munich, April 2011

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Bad Channel / FCal Positioning Studies• Plot of <Ecell> vs. rT (transverse distance of FCal cell from beamspot)

– Here using run 169045 (Pb-Pb collision data: lots of FCal energy

FCal1CFCal1A

FCalA (three ranges of rT)

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FCalC (three ranges of rT)

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A2.02.29A2.06.29A2.10.29A2.14.29

A2.01.29A2.05.29A2.09.29A2.13.29

FCal2A rT < 180 mm

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i.e. FCal2A iϕ = 01, iη = 29

C2.02.29C2.06.29C2.10.29C2.14.29

C2.01.29C2.05.29C2.09.29C2.13.29

FCal2C rT < 180 mm

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Initial thought:

A2.01.29 <--> A2.02.29A2.05.29 <--> A2.06.29A2.09.29 <--> A2.10.29A2.13.29 <--> A2.14.29

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Look at FCal2A

since, according to mapping spreadsheet, or example, A2.06.29 has smaller rT than A2.05.29

But look more closely…..

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Tile   Insertion Offset Center of GravityNumber Type Type X Y X Y X Y Radius

A2.00.28 'LEFT' RIGHT 100.19 22.43 -9.54 9.44 90.65 31.87 96.09A2.00.29 'RIGHT' LEFT 79.75 1.18 9.54 9.44 89.29 10.62 89.92

A2.01.29 'LEFT' RIGHT 100.19 64.93 -9.54 9.44 90.65 74.37 117.25A2.01.30 'RIGHT' LEFT 79.75 43.68 9.54 9.44 89.29 53.12 103.90A2.01.31 2PLUS4R_300' 2PLUS4R_300' 63.39 62.57

A2.02.29 'LEFT' RIGHT 83.83 64.93 -9.54 9.44 74.29 74.37 105.12A2.02.30 'ARROWDOWN' 'ARROWDOWN' 59.30 55.49 0.00 16.53 59.30 72.02 93.29

A2.02.31'NORWAYDOWN'

'NORWAYDOWN' 51.12 83.82 -12.27 -4.72 38.85 79.10 88.12

A2.03.27 'LEFT' RIGHT 34.76 107.43 -9.54 9.44 25.22 116.87 119.56A2.03.28 'LEFT' RIGHT 18.40 107.43 -9.54 9.44 8.86 116.87 117.21A2.03.29 'RIGHT' LEFT 14.31 86.18 9.54 9.44 23.85 95.62 98.55A2.03.30 'RIGHT' LEFT -2.04 86.18 9.54 9.44 7.50 95.62 95.92

Drawing close to 1/10 scale

Tile Tube CenterNumber X1 X2 X3 X4 X5 X6 <X> Y1 Y2 Y3 Y4 Y5 Y6 <Y> <R>

A2.00.28 87.924 96.103 83.835 92.014 87.924 96.103 90.651 24.791 24.791 31.874 31.874 38.958 38.958 31.874 96.09A2.00.29 83.835 92.014 87.924 96.103 83.835 92.014 89.287 3.542 3.542 10.625 10.625 17.708 17.708 10.625 89.92

A2.01.29 87.924 96.103 83.835 92.014 87.924 96.103 90.651 67.291 67.291 74.374 74.374 81.457 81.457 74.374 117.26A2.01.30 83.835 92.014 87.924 96.103 83.835 92.014 89.287 46.041 46.041 53.124 53.124 60.207 60.207 53.124 103.90A2.01.31 79.745 75.656 71.566 67.477 79.745 75.656 74.974 38.958 46.041 53.124 60.207 53.124 60.207 51.944 91.21

A2.02.29 71.566 79.745 67.477 75.656 71.566 79.745 74.293 67.291 67.291 74.374 74.374 81.457 81.457 74.374 105.12A2.02.30 55.208 63.387 59.298 55.208 63.387 59.298 59.298 81.457 81.457 74.374 67.291 67.291 60.207 72.013 93.28A2.02.31 22.492 30.671 38.850 47.029 42.940 51.119 38.850 81.457 81.457 81.457 81.457 74.374 74.374 79.096 88.12

A2.03.27 22.492 30.671 18.403 26.582 22.492 30.671 25.219 109.790 109.790 116.873 116.873 123.956 123.956 116.873 119.56A2.03.28 6.134 14.313 2.045 10.224 6.134 14.313 8.861 109.790 109.790 116.873 116.873 123.956 123.956 116.873 117.21A2.03.29 18.403 26.582 22.492 30.671 18.403 26.582 23.855 88.540 88.540 95.623 95.623 102.707 102.707 95.623 98.55A2.03.30 2.045 10.224 6.134 14.313 2.045 10.224 7.497 88.540 88.540 95.623 95.623 102.707 102.707 95.623 95.92

View is of readout side of FCal2A (so towards the IP since that is the rear face)

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Tile   Insertion Offset Center of GravityNumber Type Type X Y X Y X Y Radius

A2.07.28 'LEFT' RIGHT -79.75 22.43 -9.54 9.44 -89.29 31.87 94.81A2.07.29 'RIGHT' LEFT -100.19 1.18 9.54 9.44 -90.65 10.62 91.27

A2.06.29 '2ROW' '2ROW' -100.19 57.85 14.31 5.90 -85.88 63.75 106.95A2.06.30 '2ROW' '2ROW' -100.19 43.68 14.31 5.90 -85.88 49.58 99.16A2.06.31 'SWEDENUP' 'SWEDENUP' -67.48 72.01 -2.04 -17.71 -69.52 54.30 88.22

A2.05.29 '2ROW' '2ROW' -100.19 72.01 14.31 5.90 -85.88 77.91 115.95A2.05.30 'RIGHT60' 'RIGHT60' -59.30 62.57 -3.41 12.98 -62.71 75.55 98.19A2.05.31 '2PLUS4L_180''2PLUS4L_180' -55.21 83.82 15.00 -4.72 -40.21 79.10 88.73

A2.04.27 'LEFT' RIGHT -14.31 107.43 -9.54 9.44 -23.85 116.87 119.28A2.04.28 'LEFT' RIGHT 2.04 107.43 -9.54 9.44 -7.50 116.87 117.11A2.04.29 'RIGHT' LEFT -34.76 86.18 9.54 9.44 -25.22 95.62 98.89A2.04.30 'RIGHT' LEFT -18.40 86.18 9.54 9.44 -8.86 95.62 96.03

Drawing close to 1/10 scale

Number X1 X2 X3 X4 X5 X6 <X> Y1 Y2 Y3 Y4 Y5 Y6 <Y> <R>

A2.07.28 -92.014 -83.835 -96.103 -87.924 -92.014 -83.835 -89.287 24.791 24.791 31.874 31.874 38.958 38.958 31.874 94.81A2.07.29 -96.103 -87.924 -92.014 -83.835 -96.103 -87.924 -90.651 3.542 3.542 10.625 10.625 17.708 17.708 10.625 91.27

A2.06.29 -96.103 -87.924 -79.745 -92.014 -83.835 -75.656 -85.880 60.207 60.207 60.207 67.291 67.291 67.291 63.749 106.95A2.06.30 -96.103 -87.924 -79.745 -92.014 -83.835 -75.656 -85.880 46.041 46.041 46.041 53.124 53.124 53.124 49.583 99.17A2.06.31 -75.656 -71.566 -67.477 -63.387 -71.566 -67.477 -69.522 38.958 46.041 53.124 60.207 60.207 67.291 54.305 88.22

A2.05.29 -96.103 -87.924 -79.745 -92.014 -83.835 -75.656 -85.880 74.374 74.374 74.374 81.457 81.457 81.457 77.915 115.96A2.05.30 -71.566 -63.387 -55.208 -67.477 -59.298 -59.298 -62.706 74.374 74.374 74.374 81.457 81.457 67.291 75.554 98.19A2.05.31 -51.119 -42.940 -34.761 -26.582 -47.029 -38.850 -40.213 81.457 81.457 81.457 81.457 74.374 74.374 79.096 88.73

A2.04.27 -26.582 -18.403 -30.671 -22.492 -26.582 -18.403 -23.855 109.790 109.790 116.873 116.873 123.956 123.956 116.873 119.28A2.04.28 -10.224 -2.045 -14.313 -6.134 -10.224 -2.045 -7.497 109.790 109.790 116.873 116.873 123.956 123.956 116.873 117.11A2.04.29 -30.671 -22.492 -26.582 -18.403 -30.671 -22.492 -25.219 88.540 88.540 95.623 95.623 102.707 102.707 95.623 98.89A2.04.30 -14.313 -6.134 -10.224 -2.045 -14.313 -6.134 -8.861 88.540 88.540 95.623 95.623 102.707 102.707 95.623 96.03

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Tile Tube Center

Number Type X1 Y1 X2 Y2 X3 Y3 X4 Y4 X5 Y5 X6 Y6

A2.05.01 'LEFT' -304.668 308.120 -296.489 308.120 -308.757 315.203 -300.578 315.203 -304.668 322.287 -296.489 322.287

A2.05.02 'RIGHT' -194.251 386.036 -186.072 386.036 -190.162 393.119 -181.983 393.119 -194.251 400.202 -186.072 400.202

A2.05.04 'RIGHT' -177.893 386.036 -169.714 386.036 -173.804 393.119 -165.625 393.119 -177.893 400.202 -169.714 400.202

A2.02.00 '2PLUS4L_120' 304.668 315.203 300.578 322.287 296.489 329.370 292.399 336.453 292.399 322.287 288.310 329.370

A2.02.02 '2PLUS4L_300' 190.162 386.036 186.072 393.119 181.983 400.202 177.893 407.285 194.251 393.119 190.162 400.202

A2.02.04 'TRIANGLE' 165.625 386.036 173.804 386.036 181.983 386.036 169.714 393.119 177.893 393.119 173.804 400.202

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Drawing close to 1/10 scale

FCal2A Signal Endplate Drawing FCal2A Readout Tile Drawing

Note that these views are from the same side, so should match.

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Reality Check: As-built detector modules

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FCal2C Inner Edge Tiling FCal2A Inner Edge Tiling

Location of downward pointing fish-shaped channel consistent with FCal2 Tiling drawings.

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FCal3A check

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Summary• FCal2 channel mapping is OK (there is no mis-cabling).• FCal2 electrode mapping is wrong tube layout pattern for entire FCal2

(both sides) is the mirror image of what is should be (and layout is not mirror symmetric).

– The tube layout assumed for a given channel (iϕ,iη) is that that actually belonging to the channel with the same iη value but reflected iϕ.

– This affects the shape and position of every FCal2 channel, but the effect is rather small except for irregular-shaped channels which have rather different shapes on the -x and +x side of the detector: in practical terms this mean un-summed channels at the inner and out edge.

• This problem is not present for either the FCal1 or FCal3 modules.• The mapping needs to be fixed. But this will take a bit of time.• This will also necessitate regeneration of the nearest neighbour map

(Sven) as well as changes to the simulation.