Specification for broad-band tagging hodoscope

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The fixed-array hodoscope consists of 180 scintillators distributed over a length of 11.2 m at a distance of 30 cm from the focal plane of the two-magnet system.

Tagging range (for a 12 GeV electron beam):

  • Photons between 3.0 GeV and 9.0 GeV: detector positions correspond to 60 MeV steps in Eγ with 50% sampling, i.e. the counter widths correspond to 30 MeV bites resulting in ~0.8-1.1 MHz per counter at 107 γ/sec on target;
  • Photons between 9.0 GeV and 11.7 GeV: detector positions correspond to 30 MeV steps in photon energy resulting in ~400 kHz per counter at 107 γ/sec on target.

Count rates in the high-energy range allow for operation at 108 γ/sec on target. All counters will be mounted at angles such that they face normal to the path of the scattered electrons.

Scintillators

     thickness         5mm
     height           30mm
     width (quantity) 47(1), 44(1), 40(1), 38(1), 35(1), 33(1), 31(1), 30(1), 28(1), 27(1), 26(1), 25(1),
                      24(1), 23(1), 22(2), 21(1), 20(2), 19(2), 18(2), 17(2), 16(3), 15(4), 14(4), 13(5), 
                      12(6), 11(7), 10(10), 9(13), 8(16), 7(12), 6(23), 5(43), 4(19)

Photomultipliers and bases

     1" tubes with magnetic shields
     bases that can keep the gain at 2-3×105 at 10 MHz 

Readout electronics

     CFDs, TDCs, Scalers

Resolution

     timing:  rms ~100-150 psec
     energy:  30 MeV (above 9.0 GeV photon energy)
              30 MeV (sampled - below 9.0 GeV photon energy)


Fixed array focal plane counter positions

countersnew.dat (10/2/08) based on Yang's Single magnet focal_plane_design.xls
tosca file: single_row_long_q_narrow_return_yoke.op3
190 counters: from Eg=3.0 to 11.7 GeV for E_beam=12.0 GeV
below Eg=9.0 GeV: 50% sampling of 60 MeV bites

coordinates: (xcen,zcen) for z=photon beam line, y=vertical up, x=away from spectrometer
origin at crystal position (goniometer)
scen=position on focal plane (zero at position (-678.410;0;3842.163mm))
rotation in xz plane by -9.71355 deg. wrt. x axis
theta (8th col): entry angle of electron rays with respect to the focal plane
ctr.width (col.9): rounded width of scintillators

Ctr Eg_high Eg_low xcen(mm) zcen(mm) scen(mm) width(mm) theta(deg) ctr.width
1 11.70 11.67 −684.16 3875.78 34.1 47.02 42.5 47 1
2 11.67 11.64 -695.43 3941.61 100.9 43.21 40.4 44 1
3 11.64 11.61 -706.24 4004.75 164.9 39.89 38.6 40 1
4 11.61 11.58 -716.66 4065.63 226.7 37.24 37.0 38 1
5 11.58 11.55 -726.76 4124.62 286.6 34.87 35.6 35 1
6 11.55 11.52 -736.56 4181.89 344.7 32.84 34.4 33 1
7 11.52 11.49 -746.11 4237.67 401.3 31.04 33.2 31 1
8 11.49 11.46 -755.43 4292.11 456.5 29.46 32.2 30 1
9 11.46 11.43 -764.53 4345.30 510.4 28.00 31.2 28 1
10 11.43 11.40 -773.45 4397.39 563.3 26.78 30.3 27 1
11 11.40 11.37 -782.21 4448.54 615.2 25.64 29.5 26 1
12 11.37 11.34 -790.80 4498.74 666.1 24.55 28.8 25 1
13 11.34 11.31 -799.25 4548.10 716.2 23.66 28.1 24 1
14 11.31 11.28 -807.57 4596.71 765.5 22.75 27.4 23 1
15 11.28 11.25 -815.76 4644.57 814.1 21.96 26.8 22 2
16 11.25 11.22 -823.85 4691.82 862.0 21.28 26.2 22
17 11.22 11.19 -831.83 4738.45 909.3 20.54 25.7 21 1
18 11.19 11.16 -839.71 4784.47 956.0 19.95 25.2 20 2
19 11.16 11.13 -847.51 4830.01 1002.2 19.38 24.7 20
20 11.13 11.10 -855.21 4875.02 1047.9 18.78 24.2 19 2
21 11.10 11.07 -862.83 4919.50 1093.0 18.28 23.8 19
22 11.07 11.04 -870.37 4963.57 1137.7 17.81 23.4 18 2
23 11.04 11.01 -877.84 5007.24 1182.0 17.38 23.0 18
24 11.01 10.98 -885.26 5050.54 1226.0 16.95 22.6 17 2
25 10.98 10.95 -892.60 5093.42 1269.5 16.53 22.3 17
26 10.95 10.92 -899.87 5135.91 1312.6 16.15 21.9 16 3
27 10.92 10.89 -907.08 5178.05 1355.3 15.79 21.6 16
28 10.89 10.86 -914.25 5219.92 1397.8 15.49 21.3 16
29 10.86 10.83 -921.36 5261.45 1439.9 15.12 21.0 15 4
10.83| 10.80| -928.41| 5302.63| 1481.7| 14.81| 20.7| 15|- 10.80| 10.77| -935.41| 5343.53| 1523.2| 14.53| 20.4| 15|- 10.77| 10.74| -942.37| 5384.21| 1564.5| 14.28| 20.2| 15|- 10.74| 10.71| -949.29| 5424.63| 1605.5| 13.99| 19.9| 14| 4|- 10.71| 10.68| -956.16| 5464.78| 1646.2| 13.74| 19.6| 14|- 10.68| 10.65| -962.99| 5504.65| 1686.7| 13.47| 19.4| 14|- 10.65| 10.62| -969.77| 5544.27| 1726.9| 13.25| 19.2| 14|- 10.62| 10.59| -976.53| 5583.73| 1766.9| 13.06| 19.0| 13| 5|- 10.59| 10.56| -983.25| 5623.03| 1806.8| 12.85| 18.8| 13|- 10.56| 10.53| -989.94| 5662.09| 1846.4| 12.62| 18.5| 13|- 10.53| 10.50| -996.58| 5700.88| 1885.8| 12.40| 18.3| 13|- 10.50| 10.47| -1003.19| 5739.48| 1924.9| 12.24| 18.1| 13|- 10.47| 10.44| -1009.77| 5777.92| 1963.9| 12.04| 17.9| 12| 6|- 10.44| 10.41| -1016.31| 5816.17| 2002.7| 11.88| 17.8| 12|- 10.41| 10.38| -1022.84| 5854.27| 2041.4| 11.71| 17.6| 12|- 10.38| 10.35| -1029.32| 5892.14| 2079.8| 11.51| 17.4| 12|- 10.35| 10.32| -1035.78| 5929.89| 2118.1| 11.41| 17.2| 12|- 10.32| 10.29| -1042.23| 5967.59| 2156.3| 11.27| 17.1| 12|- 10.29| 10.26| -1048.66| 6005.14| 2194.4| 11.11| 16.9| 11| 7|- 10.26| 10.23| -1055.06| 6042.52| 2232.4| 10.96| 16.8| 11|- 10.23| 10.20| -1061.42| 6079.66| 2270.0| 10.77| 16.6| 11|- 10.20| 10.17| -1067.75| 6116.64| 2307.6| 10.67| 16.5| 11|- 10.17| 10.14| -1074.07| 6153.56| 2345.0| 10.56| 16.3| 11|- 10.14| 10.11| -1080.37| 6190.35| 2382.3| 10.41| 16.2| 11|- 10.11| 10.08| -1086.64| 6227.00| 2419.5| 10.30| 16.0| 11|- 10.08| 10.05| -1092.89| 6263.52| 2456.6| 10.18| 15.9| 10| 10|- 10.05| 10.02| -1099.11| 6299.89| 2493.5| 10.05| 15.8| 10|- 10.02| 9.99| -1105.32| 6336.11| 2530.2| 9.94| 15.7| 10|- 9.99| 9.96| -1111.50| 6372.27| 2566.9| 9.85| 15.5| 10|- 9.96| 9.93| -1117.68| 6408.37| 2603.5| 9.76| 15.4| 10|- 9.93| 9.90| -1123.85| 6444.36| 2640.1| 9.64| 15.3| 10|- 9.90| 9.87| -1129.99| 6480.24| 2676.4| 9.55| 15.2| 10|- 9.87| 9.84| -1136.11| 6516.02| 2712.7| 9.45| 15.1| 10|- 9.84| 9.81| -1142.21| 6551.62| 2748.9| 9.32| 14.9| 10|- 9.81| 9.78| -1148.27| 6587.08| 2784.8| 9.23| 14.8| 10|- 9.78| 9.75| -1154.34| 6622.49| 2820.8| 9.17| 14.7| 9| 13|- 9.75| 9.72| -1160.39| 6657.87| 2856.7| 9.09| 14.6| 9|- 9.72| 9.69| -1166.43| 6693.16| 2892.5| 9.00| 14.5| 9|- 9.69| 9.66| -1172.46| 6728.37| 2928.2| 8.92| 14.4| 9|- 9.66| 9.63| -1178.47| 6763.49| 2963.8| 8.83| 14.3| 9|- 9.63| 9.60| -1184.47| 6798.54| 2999.4| 8.77| 14.2| 9|- 9.60| 9.57| -1190.46| 6833.54| 3034.9| 8.69| 14.1| 9|- 9.57| 9.54| -1196.43| 6868.41| 3070.3| 8.60| 14.0| 9|- 9.54| 9.51| -1202.38| 6903.13| 3105.5| 8.50| 13.9| 9|- 9.51| 9.48| -1208.30| 6937.74| 3140.6| 8.43| 13.9| 9|- 9.48| 9.45| -1214.22| 6972.31| 3175.7| 8.38| 13.8| 9|- 9.45| 9.42| -1220.13| 7006.87| 3210.7| 8.33| 13.7| 9|- 9.42| 9.39| -1226.04| 7041.40| 3245.8| 8.26| 13.6| 9|- 9.39| 9.36| -1231.94| 7075.82| 3280.7| 8.17| 13.5| 8| 16|- 9.36| 9.33| -1237.81| 7110.14| 3315.5| 8.12| 13.4| 8|- 9.33| 9.30| -1243.68| 7144.45| 3350.3| 8.07| 13.4| 8|- 9.30| 9.27| -1249.55| 7178.70| 3385.1| 8.00| 13.3| 8|- 9.27| 9.24| -1255.38| 7212.80| 3419.7| 7.91| 13.2| 8|- 9.24| 9.21| -1261.21| 7246.83| 3454.2| 7.87| 13.1| 8|- 9.21| 9.18| -1267.03| 7280.86| 3488.7| 7.83| 13.1| 8|- 9.18| 9.15| -1272.86| 7314.88| 3523.2| 7.77| 13.0| 8|- 9.15| 9.12| -1278.66| 7348.80| 3557.6| 7.70| 12.9| 8|- 9.12| 9.09| -1284.45| 7382.58| 3591.9| 7.62| 12.8| 8|- 9.09| 9.06| -1290.22| 7416.29| 3626.1| 7.59| 12.8| 8|- 9.06| 9.03| -1296.00| 7450.05| 3660.4| 7.57| 12.7| 8|- 9.03| 9.00| -1301.77| 7483.81| 3694.6| 7.50| 12.6| 8|- 8.97| 8.94| -1313.27| 7550.98| 3762.8| 7.39| 12.5| 8|- 8.91| 8.88| -1324.72| 7617.86| 3830.6| 7.29| 12.4| 8|- 8.85| 8.82| -1336.17| 7684.76| 3898.5| 7.23| 12.3| 8|- 8.79| 8.76| -1347.58| 7751.42| 3966.1| 7.10| 12.1| 7| 12|- 95 8.73 8.70 -1358.93 7817.73 4033.4 7.02 12.0 7
96 8.67 8.64 -1370.26 7883.89 4100.5 6.95 11.9 7
97 8.61 8.58 -1381.56 7949.93 4167.5 6.85 11.8 7
98 8.55 8.52 -1392.84 8015.81 4234.4 6.80 11.7 7
99 8.49 8.46 -1404.09 8081.52 4301.0 6.71 11.6 7
100 8.43 8.40 -1415.33 8147.18 4367.6 6.64 11.5 7
101 8.37 8.34 -1426.53 8212.62 4434.0 6.56 11.4 7
102 8.31 8.28 -1437.68 8277.77 4500.1 6.48 11.3 7
103 8.25 8.22 -1448.81 8342.78 4566.1 6.43 11.2 7
104 8.19 8.16 -1459.95 8407.85 4632.1 6.36 11.1 7
105 8.13 8.10 -1471.06 8472.76 4697.9 6.31 11.0 7
106 8.07 8.04 -1482.13 8537.45 4763.6 6.22 10.9 6 23
107 8.01 7.98 -1493.18 8601.97 4829.0 6.18 10.9 6
108 7.95 7.92 -1504.22 8666.47 4894.5 6.12 10.8 6
109 7.89 7.86 -1515.23 8730.83 4959.8 6.07 10.7 6
110 7.83 7.80 -1526.26 8795.22 5025.1 6.03 10.6 6
111 7.77 7.74 -1537.24 8859.39 5090.2 5.94 10.5 6
112 7.71 7.68 -1548.17 8923.23 5155.0 5.90 10.5 6
113 7.65 7.62 -1559.12 8987.23 5219.9 5.87 10.4 6
114 7.59 7.56 -1570.06 9051.14 5284.7 5.81 10.3 6
115 7.53 7.50 -1580.97 9114.87 5349.4 5.75 10.2 6
116 7.47 7.44 -1591.86 9178.44 5413.9 5.71 10.2 6
117 7.41 7.38 -1602.73 9241.99 5478.4 5.66 10.1 6
118 7.35 7.32 -1613.60 9305.44 5542.7 5.62 10.1 6
119 7.29 7.26 -1624.44 9368.80 5607.0 5.58 10.0 6
120 7.23 7.20 -1635.29 9432.18 5671.3 5.54 9.9 6
121 7.17 7.14 -1646.09 9495.25 5735.3 5.47 9.9 6
122 7.11 7.08 -1656.87 9558.25 5799.2 5.46 9.8 6
123 7.05 7.02 -1667.68 9621.42 5863.3 5.43 9.7 6
124 6.99 6.96 -1678.46 9684.36 5927.2 5.37 9.7 6
125 6.93 6.90 -1689.21 9747.15 5990.9 5.34 9.6 6
126 6.87 6.84 -1699.96 9809.99 6054.6 5.30 9.6 6
127 6.81 6.78 -1710.70 9872.70 6118.2 5.27 9.5 6
128 6.75 6.72 -1721.44 9935.47 6181.9 5.24 9.5 6
129 6.69 6.66 -1732.15 9998.04 6245.4 5.18 9.4 5 43
130 6.63 6.60 -1742.83 10060.45 6308.7 5.15 9.4 5
131 6.57 6.54 -1753.52 10122.89 6372.1 5.14 9.3 5
132 6.51 6.48 -1764.23 10185.42 6435.5 5.10 9.3 5
133 6.45 6.42 -1774.89 10247.71 6498.7 5.05 9.2 5
134 6.39 6.36 -1785.53 10309.87 6561.8 5.03 9.2 5
135 6.33 6.30 -1796.19 10372.16 6625.0 5.01 9.1 5
136 6.27 6.24 -1806.83 10434.31 6688.0 4.97 9.1 5
137 6.21 6.18 -1817.47 10496.46 6751.1 4.95 9.0 5
138 6.15 6.12 -1828.10 10558.58 6814.1 4.92 9.0 5
139 6.09 6.06 -1838.72 10620.63 6877.1 4.89 8.9 5
140 6.03 6.00 -1849.32 10682.51 6939.8 4.86 8.9 5
141 5.97 5.94 -1859.91 10744.41 7002.6 4.83 8.8 5
142 5.91 5.88 -1870.51 10806.29 7065.4 4.80 8.8 5
143 5.85 5.82 -1881.07 10868.04 7128.1 4.78 8.8 5
144 5.79 5.76 -1891.64 10929.76 7190.7 4.76 8.7 5
145 5.73 5.70 -1902.24 10991.67 7253.5 4.74 8.7 5
146 5.67 5.64 -1912.80 11053.38 7316.1 4.70 8.6 5
147 5.61 5.58 -1923.34 11114.95 7378.6 4.67 8.6 5
148 5.55 5.52 -1933.89 11176.61 7441.1 4.66 8.6 5
149 5.49 5.46 -1944.44 11238.20 7503.6 4.62 8.5 5
150 5.43 5.40 -1954.97 11299.73 7566.0 4.61 8.5 5
151 5.37 5.34 -1965.50 11361.22 7628.4 4.59 8.4 5
152 5.31 5.28 -1976.03 11422.75 7690.8 4.57 8.4 5
153 5.25 5.22 -1986.55 11484.21 7753.2 4.54 8.4 5
154 5.19 5.16 -1997.08 11545.71 7815.6 4.52 8.3 5
155 5.13 5.10 -2007.58 11607.08 7877.9 4.50 8.3 5
156 5.07 5.04 -2018.09 11668.45 7940.1 4.48 8.3 5
157 5.01 4.98 -2028.59 11729.82 8002.4 4.45 8.2 5
158 4.95 4.92 -2039.11 11791.25 8064.7 4.46 8.2 5
159 4.89 4.86 -2049.62 11852.65 8127.0 4.42 8.2 5
160 4.83 4.80 -2060.12 11913.98 8189.2 4.40 8.1 5
161 4.77 4.74 -2070.59 11975.18 8251.3 4.37 8.1 5
162 4.71 4.68 -2081.07 12036.39 8313.4 4.38 8.1 5
163 4.65 4.62 -2091.57 12097.72 8375.6 4.35 8.0 5
164 4.59 4.56 -2102.06 12159.03 8437.8 4.33 8.0 5
165 4.53 4.50 -2112.56 12220.34 8500.0 4.32 8.0 5
166 4.47 4.44 -2123.06 12281.67 8562.3 4.31 7.9 5
167 4.41 4.38 -2133.56 12343.05 8624.5 4.30 7.9 5
168 4.35 4.32 -2144.09 12404.54 8686.9 4.28 7.9 5
169 4.29 4.26 -2154.60 12465.96 8749.2 4.25 7.8 5
170 4.23 4.20 -2165.11 12527.33 8811.5 4.25 7.8 5
171 4.17 4.14 -2175.63 12588.82 8873.9 4.24 7.8 5
172 4.11 4.08 -2186.18 12650.42 8936.4 4.22 7.8 5
173 4.05 4.02 -2196.71 12711.95 8998.8 4.21 7.7 5
174 3.99 3.96 -2207.28 12773.71 9061.5 4.22 7.7 5
175 3.93 3.90 -2217.90 12835.74 9124.4 4.21 7.7 5
176 3.87 3.84 -2228.52 12897.78 9187.3 4.19 7.7 4 19
177 3.81 3.78 -2239.15 12959.87 9250.3 4.19 7.6 4
178 3.75 3.72 -2249.80 13022.12 9313.5 4.19 7.6 4
179 3.69 3.66 -2260.50 13084.63 9376.9 4.19 7.6 4
180 3.63 3.60 -2271.25 13147.39 9440.6 4.18 7.5 4
181 3.57 3.54 -2282.03 13210.37 9504.5 4.19 7.5 4
182 3.51 3.48 -2292.84 13273.53 9568.5 4.18 7.5 4
183 3.45 3.42 -2303.68 13336.85 9632.8 4.18 7.5 4
184 3.39 3.36 -2314.63 13400.82 9697.7 4.22 7.4 4
185 3.33 3.30 -2325.66 13465.28 9763.1 4.22 7.4 4
186 3.27 3.24 -2336.74 13530.02 9828.8 4.22 7.4 4
187 3.21 3.18 -2347.90 13595.17 9894.9 4.23 7.3 4
188 3.15 3.12 -2359.13 13660.78 9961.4 4.25 7.3 4
189 3.09 3.06 -2370.46 13726.96 10028.6 4.28 7.3 4
190 3.03 3.00 -2381.92 13793.92 10096.5 4.31 7.2 4