Specification for broad-band tagging hodoscope

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TAGH-from-magnet-all.jpg

In its standard configuration the fixed-array hodoscope consists of 218 scintillators distributed over 9.1 m behind the focal-plane of the tagger spectrometer. Standard configuration refers to a coherent-peak setting at 9.0 GeV, i.e. the microscope covers the energy range 8.1<Eγ<9.1 GeV.

Tagging range (for a 12 GeV electron beam):

  • Photons between 3.0 GeV and 8.2 GeV: detector positions correspond to 60 MeV steps in Eγ with 30-50% sampling. The counter widths are chosen such that the typical rate per counter is limited to 3-4 MHz at 108 γ/sec on target;
  • Photons between 9.2 GeV and 11.78 GeV: scintillators cover the full energy range, counter widths were calculated such that the typical rate per counter is limited to 1-4 MHz 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

Material EJ-228
Thickness     6 mm
Height 40 mm (slotted into the light guides, slot depth: 3mm)


Counter # width
[mm]
distance from
focal plane
Eγ
[GeV]
ΔE
[MeV]
1 – 22 21.0 8 / 18 cm 11.43 – 11.78 10.2 – 23.7
23 – 40 16.0 8 / 18 cm 11.01 – 11.43 18.4 – 29.5
41 – 64 10.0 8 / 18 cm 10.46 – 11.01 18.7 – 26.8
65 – 81 8.0 8 / 18 cm 10.05 – 10.46 21.7 – 26.0
82 – 139 5.0 8 / 13 / 18 cm 9.20 – 10.05 16.4 – 22.2
140 – 217 4.0 8 / 13 / 18 cm 7.07 – 8.13 16.6 – 17.2
218 – 274 3.0 8 cm 3.05 – 7.03 13.7 – 20.3
      TAGH-counter-cut.jpg

Light guides

All light guides (UVT PMMA) have cylindrical shape of 120 mm length and 7/8" = 22.2mm diameter to cover the size of the photocathode. A collar at 60mm height with 2 bolts along the slot line ensure proper positioning of the counters: threaded holes for the bolts in the mounting plates are correspondingly oriented.

Photomultipliers

Hamamatsu R9800: 1" tube with 8 dynodes, rise time 1.0 ns, transit time 11 ns, 27% quantum eff., max. anode current 100 μA.
magnetic shields: μ-metal cylinders.
HV dividers and 2-stage preamps (amp. factor 8.5x) developed at Jefferson Lab, they allow for limiting the anode current to 15-20 μA at 4 MHz rate.
Operating voltage: U=900 V resulting in a gain of 5×105, anode current contributes to less than 5% of the active base current.

Readout electronics The new preamp boards have 2-channel output for fADC250 and F1TDC.


Fixed array counter positions

List updated by D. Sober based on B. Crahen's drawings of counter positions on mounting plates (7/1/14)
(counters 205-217 corrected for actual counter size as of 09-Mar-2016)

   counter #:          consecutive counter number (in parenthesis: positions not filled for coh. edge at 9.0 GeV)
   coordinates:        (xcenter,ycenter) position of counter center
                       for z=upwards, x=along focal plane, y=towards vacuum chamber
   origin of coord.:   intersection of a 0.3 GeV electron ray with the focal plane
   angle:              entry angle of electron rays with respect to the focal plane
   width:              width of scintillators (in parenthesis: changed width for coh. edge at 8.0 or 7.7 GeV)
 
counter # Eγhigh Eγlow xcenter ycenter angle width
  (GeV) (GeV) (cm) (cm) (deg) (cm)
1 11.778 11.769 -0.70 -18.0 44.078 2.1
2 11.769 11.759 -7.96 -8.0 43.087 2.1
3 11.758 11.748 6.21 -18.0 42.116 2.1
4 11.748 11.737 -1.67 -8.0 41.162 2.1
5 11.736 11.725 13.38 -18.0 40.237 2.1
6 11.725 11.713 4.86 -8.0 39.333 2.1
7 11.712 11.700 20.81 -18.0 38.451 2.1
8 11.700 11.686 11.63 -8.0 37.593 2.1
9 11.686 11.673 28.51 -18.0 36.755 2.1
10 11.672 11.658 18.67 -8.0 35.942 2.1
11 11.657 11.644 36.49 -18.0 35.149 2.1
12 11.643 11.627 25.98 -8.0 34.376 2.1
13 11.626 11.611 44.78 -18.0 33.623 2.1
14 11.611 11.594 33.58 -8.0 32.888 2.1
15 11.592 11.576 53.39 -18.0 32.172 2.1
16 11.576 11.557 41.48 -8.0 31.474 2.1
17 11.556 11.539 62.33 -18.0 30.793 2.1
18 11.538 11.518 49.70 -8.0 30.131 2.1
19 11.517 11.498 71.61 -18.0 29.485 2.1
20 11.497 11.475 58.24 -8.0 28.855 2.1
21 11.474 11.454 81.25 -18.0 28.242 2.1
22 11.453 11.429 67.12 -8.0 27.645 2.1
23 11.428 11.412 90.66 -18.0 27.130 1.6
24 11.411 11.392 74.68 -8.0 26.695 1.6
25 11.391 11.373 98.53 -18.0 26.269 1.6
26 11.372 11.352 81.92 -8.0 25.851 1.6
27 11.351 11.332 106.64 -18.0 25.442 1.6
28 11.332 11.310 89.37 -8.0 25.041 1.6
29 11.309 11.289 114.97 -18.0 24.648 1.6
30 11.288 11.266 97.05 -8.0 24.263 1.6
31 11.264 11.243 123.55 -18.0 23.885 1.6
32 11.242 11.219 104.95 -8.0 23.516 1.6
33 11.217 11.195 132.38 -18.0 23.153 1.6
34 11.194 11.169 113.10 -8.0 22.798 1.6
35 11.167 11.144 141.46 -18.0 22.450 1.6
36 11.143 11.117 121.48 -8.0 22.109 1.6
37 11.115 11.090 150.80 -18.0 21.775 1.6
38 11.089 11.061 130.11 -8.0 21.448 1.6
39 11.059 11.033 160.40 -18.0 21.128 1.6
40 11.032 11.003 138.99 -8.0 20.814 1.6
41 11.002 10.984 169.32 -18.0 20.563 1.0
42 10.984 10.965 145.53 -8.0 20.373 1.0
43 10.963 10.946 175.61 -18.0 20.186 1.0
44 10.945 10.926 151.33 -8.0 20.001 1.0
45 10.924 10.906 182.01 -18.0 19.818 1.0
46 10.905 10.885 157.23 -8.0 19.638 1.0
47 10.883 10.864 188.52 -18.0 19.460 1.0
48 10.864 10.843 163.23 -8.0 19.285 1.0
49 10.842 10.822 195.13 -18.0 19.111 1.0
50 10.822 10.800 169.34 -8.0 18.940 1.0
51 10.798 10.778 201.86 -18.0 18.771 1.0
52 10.778 10.755 175.56 -8.0 18.605 1.0
53 10.757 10.733 208.70 -18.0 18.441 1.0
54 10.732 10.709 181.88 -8.0 18.278 1.0
55 10.708 10.686 215.65 -18.0 18.118 1.0
56 10.686 10.662 188.32 -8.0 17.960 1.0
57 10.660 10.638 222.71 -18.0 17.803 1.0
58 10.638 10.613 194.86 -8.0 17.649 1.0
59 10.611 10.588 229.89 -18.0 17.497 1.0
60 10.588 10.563 201.51 -8.0 17.347 1.0
61 10.561 10.537 237.19 -18.0 17.199 1.0
62 10.537 10.511 208.28 -8.0 17.053 1.0
63 10.509 10.485 244.60 -18.0 16.908 1.0
64 10.484 10.458 215.15 -8.0 16.766 1.0
65 10.456 10.436 251.75 -18.0 16.639 0.8
66 10.436 10.414 221.09 -8.0 16.528 0.8
67 10.412 10.393 257.85 -18.0 16.418 0.8
68 10.392 10.369 226.75 -8.0 16.309 0.8
69 10.367 10.346 264.023 -18.0 16.201 0.8
70 10.346 10.323 232.49 -8.0 16.095 0.8
71 10.321 10.300 270.28 -18.0 15.989 0.8
72 10.300 10.276 238.30 -8.0 15.885 0.8
73 10.274 10.252 276.61 -18.0 15.781 0.8
74 10.252 10.228 244.18 -8.0 15.679 0.8
75 10.226 10.204 283.02 -18.0 15.578 0.8
76 10.204 10.179 250.14 -8.0 15.478 0.8
77 10.177 10.154 289.50 -18.0 15.379 0.8
78 10.154 10.129 256.17 -8.0 15.281 0.8
79 10.127 10.104 296.06 -18.0 15.184 0.8
80 10.104 10.078 262.28 -8.0 15.088 0.8
81 10.077 10.052 284.03 -13.0 14.993 0.8
82 10.051 10.035 305.42 -18.0 14.916 0.5
83 10.035 10.019 269.83 -8.0 14.858 0.5
84 10.018 10.003 290.71 -13.0 14.800 0.5
85 10.001 9.986 311.75 -18.0 14.742 0.5
86 9.986 9.969 275.71 -8.0 14.685 0.5
87 9.968 9.952 296.85 -13.0 14.628 0.5
88 9.951 9.935 318.14 -18.0 14.572 0.5
89 9.935 9.918 281.66 -8.0 14.516 0.5
90 9.917 9.901 303.05 -13.0 14.460 0.5
91 9.899 9.883 324.60 -18.0 14.405 0.5
92 9.883 9.866 287.68 -8.0 14.350 0.5
93 9.865 9.848 309.33 -13.0 14.295 0.5
94 9.847 9.830 331.13 -18.0 14.241 0.5
95 9.830 9.813 293.77 -8.0 14.187 0.5
96 9.812 9.794 315.67 -13.0 14.134 0.5
97 9.793 9.776 337.74 -18.0 14.081 0.5
98 9.776 9.758 299.93 -8.0 14.028 0.5
99 9.757 9.740 322.08 -13.0 13.975 0.5
100 9.738 9.721 344.41 -18.0 13.923 0.5
101 9.721 9.703 306.15 -8.0 13.871 0.5
102 9.702 9.684 328.56 -13.0 13.820 0.5
103 9.683 9.665 352.70 -18.38 13.769 0.5
104 9.665 9.647 312.44 -8.0 13.718 0.5
105 9.646 9.627 336.99 -13.46 13.668 0.5
106 9.626 9.608 359.53 -18.38 13.617 0.5
107 9.608 9.589 318.80 -8.0 13.568 0.5
108 9.588 9.569 343.32 -13.38 13.518 0.5
109 9.568 9.550 365.68 -18.2 13.469 0.5
110 9.550 9.531 325.23 -8.0 13.420 0.5
111 9.530 9.511 350.34 -13.46 13.372 0.5
112 9.509 9.491 371.78 -18.0 13.324 0.5
113 9.491 9.471 331.73 -8.0 13.276 0.5
114 9.470 9.451 358.42 -13.76 13.228 0.5
115 9.449 9.430 378.80 -18.0 13.181 0.5
116 9.430 9.410 338.29 -8.0 13.134 0.5
117 9.409 9.390 363.97 -13.46 13.088 0.5
118 9.388 9.369 385.88 -18.0 13.041 0.5
119 9.369 9.348 344.93 -8.0 12.996 0.5
120 9.347 9.327 368.90 -13.0 12.950 0.5
121 9.326 9.306 393.04 -18.0 12.904 0.5
122 9.306 9.286 351.64 -8.0 12.859 0.5
123 9.285 9.264 375.87 -13.0 12.815 0.5
124 9.284 9.243 400.27 -18.0 12.770 0.5
125 9.243 9.222 358.41 -8.0 12.726 0.5
126 9.221 9.200 382.90 -13.0 12.682 0.5
127 9.198 9.178 407.56 -18.0 12.639 0.5
(128) 9.178 9.157 365.26 -8.0 12.595 (0.5)
(129) 9.156 9.134 390.01 -13.0 12.552 (0.5)
(130) 9.133 9.112 414.93 -18.0 12.509 (0.5)
(131) 9.112 9.090 372.17 -8.0 12.467 (0.5)
(132) 9.089 9.068 397.18 -13.0 12.425 (0.5)
(133) 9.066 9.045 422.37 -18.0 12.383 (0.5)
(134) 9.045 9.023 379.15 -8.0 12.341 (0.5)
(135) 9.022 9.000 404.43 -13.0 12.300 (0.5)
(136) 8.998 8.977 429.87 -18.0 12.259 (0.5)
(137) 8.977 8.954 386.21 -8.0 12.218 (0.5)
(138) 8.953 8.931 411.74 -13.0 12.178 (0.5)
(139) 8.929 8.908 437.45 -18.0 12.137 (0.5)
(140) 8.908 8.890 393.09 -8.0 12.101 (0.4)
(141) 8.889 8.871 418.39 -13.0 12.069 (0.4)
(142) 8.869 8.852 443.81 -18.0 12.038 (0.4)
(143) 8.852 8.833 398.84 -8.0 12.006 (0.4)
(144) 8.832 8.814 424.34 -13.0 11.975 (0.4)
(145) 8.812 8.795 449.97 -18.0 11.944 (0.4)
(146) 8.795 8.776 404.63 -8.0 11.913 (0.4)
(147) 8.775 8.756 430.33 -13.0 11.882 (0.4)
(148) 8.755 8.738 457.98 -18.38 11.851 (0.4)
(149) 8.737 8.718 410.46 -8.0 11.821 (0.4)
(150) 8.717 8.698 440.02 -13.76 11.790 (0.4)
(151) 8.697 8.679 464.24 -18.38 11.760 (0.4)
(152) 8.679 8.659 416.35 -8.0 11.730 (0.4)
(153) 8.658 8.639 444.79 -13.48 11.700 (0.4)
(154) 8.638 8.619 469.69 -18.2 11.671 (0.4)
(155) 8.619 8.600 422.27 -8.0 11.641 (0.4)
(156) 8.600 8.579 449.58 -13.2 11.612 (0.4)
(157) 8.578 8.559 475.04 -18.0 11.582 (0.4)
(158) 8.569 8.539 428.24 -8.0 11.553 (0.4)
(159) 8.539 8.519 456.26 -13.3 11.524 (0.4)
(160) 8.517 8.498 481.42 -18.0 11.496 (0.4)
(161) 8.498 8.478 434.25 -8.0 11.467 (0.4)
(162) 8.477 8.458 464.75 -13.76 11.438 (0.4)
(163) 8.456 8.437 487.84 -18.0 11.410 (0.4)
(164) 8.437 8.417 439.56 -7.85 11.382 (0.4)
(165) 8.416 8.395 469.52 -13.46 11.354 (0.4)
(166) 8.394 8.375 494.30 -18.0 11.326 (0.4)
(167) 8.375 8.354 444.89 -7.7 11.298 (0.4)
(168) 8.353 8.333 474.57 -13.2 11.271 (0.4)
(169) 8.331 8.311 500.81 -18.0 11.243 (0.4)
(170) 8.311 8.291 450.26 -7.54 11.216 (0.4)
(171) 8.290 8.269 479.90 -13.0 11.189 (0.4)
(172) 8.267 8.248 507.37 -18.0 11.162 (0.4)
(173) 8.248 8.226 458.76 -8.0 11.135 (0.4)
(174) 8.225 8.205 486.30 -13.0 11.108 (0.4)
(175) 8.203 8.183 513.97 -18.0 11.082 (0.4)
(176) 8.186 8.164 464.73 -8.0 11.058 (0.4)
(177) 8.169 8.148 491.93 -13.0 11.039 (0.4)
(178) 8.151 8.131 519.22 -18.0 11.019 (0.4)
179 8.137 8.115 469.44 -8.0 10.999 0.4
180 8.120 8.098 496.78 -13.0 10.980 0.4
181 8.102 8.081 524.22 -18.0 10.960 0.4
182 8.088 8.066 474.16 -8.0 10.941 0.4
183 8.070 8.049 501.66 -13.0 10.922 0.4
184 8.053 8.031 529.25 -18.0 10.903 0.4
185 8.038 8.016 478.92 -8.0 10.883 0.4
186 8.031 7.998 506.561 -13.0 10.864 0.4
187 8.003 7.980 534.30 -18.0 10.845 0.4
188 7.987 7.965 483.70 -8.0 10.827 0.4
189 7.970 7.948 511.49 -13.0 10.808 0.4
190 7.952 7.930 539.37 -18.0 10.789 0.4
191 7.937 7.914 488.50 -8.0 10.770 0.4
192 7.930 7.896 516.44 -13.0 10.752 0.4
193 7.901 7.879 544.47 -18.0 10.733 0.4
194 7.861 7.838 495.67 -8.0 10.679 0.4
195 7.799 7.777 554.65 -18.0 10.616 0.4
196 7.741 7.718 506.90 -8.0 10.555 0.4 (0.3)
197 7.681 7.658 512.49 -8.0 10.495 0.4 (0.3)
198 7.621 7.598 518.06 -8.0 10.436 0.4 (0.3)
199 7.562 7.538 523.60 -8.0 10.378 0.4 (0.3)
200 7.502 7.478 529.13 -8.0 10.322 0.4 (0.3)
201 7.442 7.417 534.63 -8.0 10.267 0.4 (0.3)
202 7.382 7.357 540.12 -8.0 10.214 0.4 (0.3)
203 7.322 7.297 545.59 -8.0 10.161 0.4 (0.3)
204 7.262 7.237 551.04 -8.0 10.109 0.4 (0.3)
205 7.203 7.173 612.84 -18.0 10.059 0.5 (0.3)
206 7.143 7.112 618.54 -18.0 10.010 0.5 (0.3)
207 7.083 7.052 624.22 -18.0 9.961 0.5 (0.3)
208 7.023 6.992 629.87 -18.0 9.914 0.5 (0.3)
209 6.966 6.933 578.02 -8.0 9.867 0.5 (0.3)
210 6.903 6.872 641.13 -18.0 9.822 0.5 (0.3)
211 6.843 6.816 588.70 -8.0 9.777 0.4 (0.3)
212 6.780 6.754 652.31 -18.0 9.733 0.4 (0.3)
213 6.726 6.693 599.31 -8.0 9.690 0.5 (0.3)
214 6.660 6.634 663.42 -18.0 9.648 0.4 (0.3)
215 6.606 6.572 609.87 -8.0 9.607 0.5 (0.3)
216 6.540 6.514 674.46 -18.0 9.566 0.4 (0.3)
217 6.483 6.456 620.37 -8.0 9.526 0.4 (0.3)
218 6.417 6.397 685.44 -18.0 9.487 0.3
219 6.357 6.337 690.90 -18.0 9.449 0.3
220 6.300 6.279 636.01 -8.0 9.411 0.3
221 6.240 6.219 641.20 -8.0 9.374 0.3
222 6.180 6.159 646.38 -8.0 9.337 0.3
223 6.120 6.099 651.54 -8.0 9.301 0.3
224 6.059 6.038 687.34 -13.0 9.266 0.3
225 6.001 5.979 661.83 -8.0 9.231 0.3
226 5.941 5.919 666.96 -8.0 9.197 0.3
227 5.881 5.859 672.08 -8.0 9.163 0.3
228 5.821 5.799 677.18 -8.0 9.130 0.3
229 5.758 5.737 744.72 -18.0 9.098 0.3
230 5.698 5.676 750.03 -18.0 9.066 0.3
231 5.638 5.616 755.33 -18.0 9.034 0.3
232 5.578 5.556 760.61 -18.0 9.003 0.3
233 5.521 5.498 702.55 -8.0 8.973 0.3
234 5.458 5.436 771.13 -18.0 8.943 0.3
235 5.401 5.378 712.62 -8.0 8.913 0.3
236 5.338 5.316 781.62 -18.0 8.884 0.3
237 5.281 5.268 722.66 -8.0 8.855 0.3
238 5.219 5.196 792.06 -18.0 8.826 0.3
239 5.162 5.138 732.66 -8.0 8.798 0.3
240 5.099 5.076 802.45 -18.0 8.771 0.3
241 5.042 5.018 742.62 -8.0 8.743 0.3
242 4.979 4.956 812.82 -18.0 8.716 0.3
243 4.919 4.896 817.98 -18.0 8.690 0.3
244 4.862 4.838 757.50 -8.0 8.664 0.3
245 4.802 4.778 762.95 -8.07 8.638 0.3
246 4.742 4.718 768.39 -8.15 8.612 0.3
247 4.682 4.658 773.82 -8.23 8.587 0.3
248 4.621 4.597 809.09 -12.8 8.562 0.3
249 4.561 4.537 815.46 -13.0 8.537 0.3
250 4.503 4.478 787.06 -8.0 8.513 0.3
251 4.442 4.418 792.48 -8.08 8.488 0.3
252 4.382 4.358 797.89 -8.15 8.464 0.3
253 4.323 4.298 803.30 -8.23 8.441 0.3
254 4.259 4.235 874.23 -18.0 8.417 0.3
255 4.199 4.175 879.30 -18.0 8.394 0.3
256 4.139 4.115 884.36 -18.0 8.371 0.3
257 4.079 4.055 889.43 -18.0 8.348 0.3
258 4.019 3.995 894.48 -18.0 8.326 0.3
259 3.959 3.935 899.54 -18.0 8.303 0.3
260 3.900 3.875 904.59 -18.0 8.281 0.3
261 3.840 3.815 909.64 -18.0 8.259 0.3
262 3.780 3.755 914.69 -18.0 8.237 0.3
263 3.723 3.697 850.47 -8.0 8.216 0.3
264 3.663 3.637 855.34 -8.0 8.194 0.3
265 3.603 3.577 860.21 -8.0 8.173 0.3
266 3.543 3.517 865.08 -8.0 8.152 0.3
267 3.483 3.457 869.95 -8.0 8.131 0.3
268 3.423 3.397 874.83 -8.0 8.110 0.3
269 3.363 3.337 879.71 -8.0 8.089 0.3
270 3.303 3.277 884.59 -8.0 8.068 0.3
271 3.243 3.217 889.49 -8.0 8.047 0.3
272 3.183 3.157 894.39 -8.0 8.027 0.3
273 3.123 3.097 899.29 -8.0 8.006 0.3
274 3.064 3.037 904.21 -8.0 7.986 0.3