Difference between revisions of "Specification for broad-band tagging hodoscope"

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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&lt;E<sub>&gamma;</sub>&lt;9.1 GeV.  
 
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&lt;E<sub>&gamma;</sub>&lt;9.1 GeV.  
  

Revision as of 18:11, 9 June 2013

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 8.1 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 9.1 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 / 13 cm 11.43 – 11.78 10.2 – 23.7
23 – 40 16.0 8 / 13 cm 11.01 – 11.43 18.4 – 29.5
41 – 64 10.0 8 / 13 cm 10.46 – 11.01 18.7 – 26.8
65 – 81 8.0 8 / 13 cm 10.06 – 10.46 21.7 – 26.0
82 – 131 5.0 8 / 13 cm 9.10 – 10.06 16.4 – 22.2
183* – 207 4.0 8 / 13 cm 7.07 – 8.08 16.6 – 17.2
208 – 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

   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 11.78 11.77 -5.858 -13.0 44.078 2.1
2 11.77 11.76 -7.963 -8.0 43.087 2.1
3 11.76 11.749 0.681 -13.0 42.116 2.1
4 11.749 11.738 -1.669 -8.0 41.162 2.1
5 11.738 11.726 7.474 -13.0 40.237 2.1
6 11.726 11.714 4.859 -8.0 39.333 2.1
7 11.714 11.701 14.511 -13.0 38.451 2.1
8 11.701 11.688 11.632 -8.0 37.593 2.1
9 11.688 11.674 21.812 -13.0 36.755 2.1
10 11.674 11.66 18.669 -8.0 35.942 2.1
11 11.66 11.645 29.392 -13.0 35.149 2.1
12 11.645 11.629 25.982 -8.0 34.376 2.1
13 11.629 11.613 37.264 -13.0 33.623 2.1
14 11.613 11.596 33.581 -8.0 32.888 2.1
15 11.596 11.578 45.441 -13.0 32.172 2.1
16 11.578 11.56 41.480 -8.0 31.474 2.1
17 11.56 11.541 53.938 -13.0 30.793 2.1
18 11.541 11.521 49.695 -8.0 30.131 2.1
19 11.521 11.5 62.766 -13.0 29.485 2.1
20 11.5 11.478 58.238 -8.0 28.855 2.1
21 11.478 11.456 71.945 -13.0 28.242 2.1
22 11.456 11.433 67.120 -8.0 27.645 2.1
23 11.433 11.414 80.899 -13.0 27.130 1.6
24 11.414 11.395 74.679 -8.0 26.695 1.6
25 11.395 11.376 88.400 -13.0 26.269 1.6
26 11.376 11.356 81.916 -8.0 25.851 1.6
27 11.356 11.335 96.125 -13.0 25.442 1.6
28 11.335 11.314 89.369 -8.0 25.041 1.6
29 11.314 11.292 104.077 -13.0 24.648 1.6
30 11.292 11.27 97.048 -8.0 24.263 1.6
31 11.27 11.247 112.263 -13.0 23.885 1.6
32 11.247 11.223 104.954 -8.0 23.516 1.6
33 11.223 11.199 120.688 -13.0 23.153 1.6
34 11.199 11.174 113.097 -8.0 22.798 1.6
35 11.174 11.148 129.360 -13.0 22.450 1.6
36 11.148 11.121 121.482 -8.0 22.109 1.6
37 11.121 11.094 138.282 -13.0 21.775 1.6
38 11.094 11.066 130.111 -8.0 21.448 1.6
39 11.066 11.038 147.458 -13.0 21.128 1.6
40 11.038 11.008 138.990 -8.0 20.814 1.6
41 11.008 10.989 155.994 -13.0 20.563 1.0
42 10.989 10.97 145.527 -8.0 20.373 1.0
43 10.97 10.951 162.013 -13.0 20.186 1.0
44 10.951 10.931 151.325 -8.0 20.001 1.0
45 10.931 10.911 168.137 -13.0 19.818 1.0
46 10.911 10.891 157.226 -8.0 19.638 1.0
47 10.891 10.87 174.366 -13.0 19.460 1.0
48 10.87 10.849 163.231 -8.0 19.285 1.0
49 10.849 10.828 180.703 -13.0 19.111 1.0
50 10.828 10.806 169.341 -8.0 18.940 1.0
51 10.806 10.784 187.148 -13.0 18.771 1.0
52 10.784 10.762 175.558 -8.0 18.605 1.0
53 10.762 10.739 193.702 -13.0 18.441 1.0
54 10.739 10.716 181.882 -8.0 18.278 1.0
55 10.716 10.692 200.366 -13.0 18.118 1.0
56 10.692 10.669 188.315 -8.0 17.960 1.0
57 10.669 10.644 207.143 -13.0 17.803 1.0
58 10.644 10.62 194.858 -8.0 17.649 1.0
59 10.62 10.595 214.031 -13.0 17.497 1.0
60 10.595 10.57 201.511 -8.0 17.347 1.0
61 10.57 10.544 221.033 -13.0 17.199 1.0
62 10.544 10.518 208.276 -8.0 17.053 1.0
63 10.518 10.492 228.149 -13.0 16.908 1.0
64 10.492 10.465 215.154 -8.0 16.766 1.0
65 10.465 10.443 235.015 -13.0 16.639 0.8
66 10.443 10.421 221.088 -8.0 16.528 0.8
67 10.421 10.399 240.879 -13.0 16.418 0.8
68 10.399 10.377 226.750 -8.0 16.309 0.8
69 10.377 10.354 246.817 -13.0 16.201 0.8
70 10.354 10.331 232.485 -8.0 16.095 0.8
71 10.331 10.308 252.831 -13.0 15.989 0.8
72 10.308 10.284 238.295 -8.0 15.885 0.8
73 10.284 10.26 258.919 -13.0 15.781 0.8
74 10.26 10.236 244.179 -8.0 15.679 0.8
75 10.236 10.212 265.083 -13.0 15.578 0.8
76 10.212 10.187 250.138 -8.0 15.478 0.8
77 10.187 10.162 271.324 -13.0 15.379 0.8
78 10.162 10.137 256.172 -8.0 15.281 0.8
79 10.137 10.112 277.641 -13.0 15.184 0.8
80 10.112 10.086 262.281 -8.0 15.088 0.8
81 10.086 10.06 284.034 -13.0 14.993 0.8
82 10.06 10.044 267.882 -8.0 14.916 0.5
83 10.044 10.027 288.675 -13.0 14.858 0.5
84 10.027 10.011 271.783 -8.0 14.800 0.5
85 10.011 9.994 292.745 -13.0 14.742 0.5
86 9.994 9.977 275.713 -8.0 14.685 0.5
87 9.977 9.96 296.845 -13.0 14.628 0.5
88 9.96 9.943 279.673 -8.0 14.572 0.5
89 9.943 9.926 300.975 -13.0 14.516 0.5
90 9.926 9.909 283.663 -8.0 14.460 0.5
91 9.909 9.892 305.136 -13.0 14.405 0.5
92 9.892 9.874 287.683 -8.0 14.350 0.5
93 9.874 9.857 309.327 -13.0 14.295 0.5
94 9.857 9.839 291.734 -8.0 14.241 0.5
95 9.839 9.821 313.548 -13.0 14.187 0.5
96 9.821 9.803 295.814 -8.0 14.134 0.5
97 9.803 9.785 317.800 -13.0 14.081 0.5
98 9.785 9.767 299.925 -8.0 14.028 0.5
99 9.767 9.749 322.083 -13.0 13.975 0.5
100 9.749 9.73 304.066 -8.0 13.923 0.5
101 9.73 9.712 326.396 -13.0 13.871 0.5
102 9.712 9.693 308.238 -8.0 13.820 0.5
103 9.693 9.674 330.739 -13.0 13.769 0.5
104 9.674 9.655 312.440 -8.0 13.718 0.5
105 9.655 9.636 335.114 -13.0 13.668 0.5
106 9.636 9.617 316.673 -8.0 13.617 0.5
107 9.617 9.598 339.519 -13.0 13.568 0.5
108 9.598 9.579 320.936 -8.0 13.518 0.5
109 9.579 9.559 343.955 -13.0 13.469 0.5
110 9.559 9.54 325.229 -8.0 13.420 0.5
111 9.54 9.52 348.421 -13.0 13.372 0.5
112 9.52 9.5 329.554 -8.0 13.324 0.5
113 9.5 9.48 352.918 -13.0 13.276 0.5
114 9.48 9.46 333.908 -8.0 13.228 0.5
115 9.46 9.44 357.447 -13.0 13.181 0.5
116 9.44 9.42 338.294 -8.0 13.134 0.5
117 9.42 9.399 362.005 -13.0 13.088 0.5
118 9.399 9.379 342.711 -8.0 13.041 0.5
119 9.379 9.358 366.595 -13.0 12.996 0.5
120 9.358 9.337 347.158 -8.0 12.950 0.5
121 9.337 9.316 371.216 -13.0 12.904 0.5
122 9.316 9.295 351.636 -8.0 12.859 0.5
123 9.295 9.274 375.868 -13.0 12.815 0.5
124 9.274 9.253 356.145 -8.0 12.770 0.5
125 9.253 9.231 380.551 -13.0 12.726 0.5
126 9.231 9.21 360.685 -8.0 12.682 0.5
127 9.21 9.188 385.264 -13.0 12.639 0.5
128 9.188 9.166 365.255 -8.0 12.595 0.5
129 9.166 9.144 390.009 -13.0 12.552 0.5
130 9.144 9.122 369.857 -8.0 12.509 0.5
131 9.122 9.1 394.784 -13.0 12.467 0.5
(132) 9.1 9.078 374.489 -8.0 12.425 (0.5)
(133) 9.078 9.055 399.591 -13.0 12.383 (0.5)
(134) 9.055 9.033 379.153 -8.0 12.341 (0.5)
(135) 9.033 9.01 404.428 -13.0 12.300 (0.5)
(136) 9.01 8.987 383.847 -8.0 12.259 (0.5)
(137) 8.987 8.964 409.297 -13.0 12.218 (0.5)
(138) 8.964 8.941 388.573 -8.0 12.178 (0.5)
(139) 8.941 8.918 414.196 -13.0 12.137 (0.5)
(140) 8.918 8.899 439.731 -18.0 12.101 (0.4)
(141) 8.899 8.881 395.001 -8.0 12.069 (0.4)
(142) 8.881 8.862 420.364 -13.0 12.038 (0.4)
(143) 8.862 8.843 445.858 -18.0 12.006 (0.4)
(144) 8.843 8.824 400.762 -8.0 11.975 (0.4)
(145) 8.824 8.805 426.330 -13.0 11.944 (0.4)
(146) 8.805 8.786 452.030 -18.0 11.913 (0.4)
(147) 8.786 8.766 406.569 -8.0 11.882 (0.4)
(148) 8.766 8.747 432.341 -13.0 11.851 (0.4)
(149) 8.747 8.728 458.245 -18.0 11.821 (0.4)
(150) 8.728 8.708 412.420 -8.0 11.790 (0.4)
(151) 8.708 8.689 438.397 -13.0 11.760 (0.4)
(152) 8.689 8.669 464.506 -18.0 11.730 (0.4)
(153) 8.669 8.649 418.315 -8.0 11.700 (0.4)
(154) 8.649 8.629 444.497 -13.0 11.671 (0.4)
(155) 8.629 8.609 470.810 -18.0 11.641 (0.4)
(156) 8.609 8.589 424.255 -8.0 11.612 (0.4)
(157) 8.589 8.569 450.641 -13.0 11.582 (0.4)
(158) 8.569 8.549 477.159 -18.0 11.553 (0.4)
(159) 8.549 8.529 430.239 -8.0 11.524 (0.4)
(160) 8.529 8.509 456.830 -13.0 11.496 (0.4)
(161) 8.509 8.488 483.551 -18.0 11.467 (0.4)
(162) 8.488 8.468 436.268 -8.0 11.438 (0.4)
(163) 8.468 8.447 463.063 -13.0 11.410 (0.4)
(164) 8.447 8.427 489.988 -18.0 11.382 (0.4)
(165) 8.427 8.406 442.342 -8.0 11.354 (0.4)
(166) 8.406 8.385 469.340 -13.0 11.326 (0.4)
(167) 8.385 8.364 496.469 -18.0 11.298 (0.4)
(168) 8.364 8.343 448.460 -8.0 11.271 (0.4)
(169) 8.343 8.322 475.661 -13.0 11.243 (0.4)
(170) 8.322 8.301 502.993 -18.0 11.216 (0.4)
(171) 8.301 8.279 454.622 -8.0 11.189 (0.4)
(172) 8.279 8.258 482.027 -13.0 11.162 (0.4)
(173) 8.258 8.237 509.561 -18.0 11.135 (0.4)
(174) 8.237 8.215 460.829 -8.0 11.108 (0.4)
(175) 8.215 8.194 488.436 -13.0 11.082 (0.4)
(176) 8.194 8.177 515.897 -18.0 11.058 (0.3)
(177) 8.177 8.161 466.296 -8.0 11.039 (0.3)
(178) 8.161 8.145 493.541 -13.0 11.019 (0.3)
(179) 8.145 8.128 520.883 -18.0 10.999 (0.3)
(180) 8.128 8.112 471.009 -8.0 10.980 (0.3)
(181) 8.112 8.095 498.403 -13.0 10.960 (0.3)
(182) 8.095 8.079 525.894 -18.0 10.941 (0.3)
183 8.079 8.062 475.746 -8.0 10.922 0.4 (0.3)
(184) 8.062 8.045 503.290 -13.0 10.903 (0.3)
185 8.045 8.029 504.924
(530.929)
-13.0
(-18.0)
10.883 0.4 (0.3)
(186) 8.029 8.012 480.509 -8.0 10.864 (0.3)
187 8.012 7.995 482.102
(508.201)
-8.0
(-13.0)
10.845 0.4 (0.3)
(188) 7.995 7.978 535.988 -18.0 10.827 (0.3)
189 7.978 7.961 511.488
(485.297)
-13.0
(-8.0)
10.808 0.4 (0.3)
(190) 7.961 7.944 513.136 -13.0 10.789 (0.3)
191 7.944 7.927 488.502
(541.072)
-8.0
(-18.0)
10.770 0.4 (0.3)
(192) 7.927 7.91 490.109 -8.0 10.752 (0.3)
193 7.91 7.893 518.096 -13.0 10.733 0.4 (0.3)
194 7.869 7.851 495.67 -8.0 10.679 0.4 (0.3)
195 7.809 7.791 501.30 -8.0 10.616 0.4 (0.3)
196 7.749 7.731 506.90 -8.0 10.555 0.4 (0.3)
197 7.689 7.671 512.49 -8.0 10.495 0.4 (0.3)
198 7.629 7.611 518.06 -8.0 10.436 0.4 (0.3)
199 7.569 7.551 523.60 -8.0 10.378 0.4 (0.3)
200 7.509 7.491 529.13 -8.0 10.322 0.4 (0.3)
201 7.449 7.431 534.63 -8.0 10.267 0.4 (0.3)
202 7.389 7.371 540.12 -8.0 10.214 0.4 (0.3)
203 7.329 7.311 545.59 -8.0 10.161 0.4 (0.3)
204 7.269 7.251 551.04 -8.0 10.109 0.4 (0.3)
205 7.209 7.190 556.47 -8.0 10.059 0.4 (0.3)
206 7.150 7.130 561.88 -8.0 10.010 0.4 (0.3)
207 7.090 7.070 567.28 -8.0 9.961 0.4 (0.3)
208 7.030 7.010 572.66 -8.0 9.914 0.3
209 6.970 6.950 578.02 -8.0 9.867 0.3
210 6.910 6.890 583.37 -8.0 9.822 0.3
211 6.850 6.830 588.70 -8.0 9.777 0.3
212 6.790 6.770 594.01 -8.0 9.733 0.3
213 6.730 6.710 599.31 -8.0 9.690 0.3
214 6.670 6.650 604.60 -8.0 9.648 0.3
215 6.610 6.590 609.87 -8.0 9.607 0.3
216 6.550 6.530 615.12 -8.0 9.566 0.3
217 6.490 6.470 620.37 -8.0 9.526 0.3
218 6.430 6.410 625.59 -8.0 9.487 0.3
219 6.371 6.349 630.81 -8.0 9.449 0.3
220 6.311 6.289 636.01 -8.0 9.411 0.3
221 6.251 6.229 641.20 -8.0 9.374 0.3
222 6.191 6.169 646.38 -8.0 9.337 0.3
223 6.131 6.109 651.54 -8.0 9.301 0.3
224 6.071 6.049 656.69 -8.0 9.266 0.3
225 6.011 5.989 661.83 -8.0 9.231 0.3
226 5.951 5.929 666.96 -8.0 9.197 0.3
227 5.891 5.869 672.08 -8.0 9.163 0.3
228 5.831 5.809 677.18 -8.0 9.130 0.3
229 5.771 5.749 682.27 -8.0 9.098 0.3
230 5.711 5.689 687.36 -8.0 9.066 0.3
231 5.651 5.629 692.43 -8.0 9.034 0.3
232 5.591 5.569 697.49 -8.0 9.003 0.3
233 5.531 5.509 702.55 -8.0 8.973 0.3
234 5.471 5.449 707.59 -8.0 8.943 0.3
235 5.412 5.388 712.62 -8.0 8.913 0.3
236 5.352 5.328 717.64 -8.0 8.884 0.3
237 5.292 5.268 722.66 -8.0 8.855 0.3
238 5.232 5.208 727.66 -8.0 8.826 0.3
239 5.172 5.148 732.66 -8.0 8.798 0.3
240 5.112 5.088 737.64 -8.0 8.771 0.3
241 5.052 5.028 742.62 -8.0 8.743 0.3
242 4.992 4.968 747.59 -8.0 8.716 0.3
243 4.932 4.908 752.55 -8.0 8.690 0.3
244 4.872 4.848 757.50 -8.0 8.664 0.3
245 4.812 4.788 762.45 -8.0 8.638 0.3
246 4.752 4.728 767.38 -8.0 8.612 0.3
247 4.692 4.668 772.31 -8.0 8.587 0.3
248 4.632 4.608 777.23 -8.0 8.562 0.3
249 4.572 4.548 782.15 -8.0 8.537 0.3
250 4.512 4.488 787.06 -8.0 8.513 0.3
251 4.452 4.428 791.97 -8.0 8.488 0.3
252 4.392 4.368 796.87 -8.0 8.464 0.3
253 4.333 4.307 801.76 -8.0 8.441 0.3
254 4.273 4.247 806.65 -8.0 8.417 0.3
255 4.213 4.187 811.53 -8.0 8.394 0.3
256 4.153 4.127 816.41 -8.0 8.371 0.3
257 4.093 4.067 821.28 -8.0 8.348 0.3
258 4.033 4.007 826.15 -8.0 8.326 0.3
259 3.973 3.947 831.02 -8.0 8.303 0.3
260 3.913 3.887 835.88 -8.0 8.281 0.3
261 3.853 3.827 840.75 -8.0 8.259 0.3
262 3.793 3.767 845.61 -8.0 8.237 0.3
263 3.733 3.707 850.47 -8.0 8.216 0.3
264 3.673 3.647 855.34 -8.0 8.194 0.3
265 3.613 3.587 860.21 -8.0 8.173 0.3
266 3.553 3.527 865.08 -8.0 8.152 0.3
267 3.493 3.467 869.95 -8.0 8.131 0.3
268 3.433 3.407 874.83 -8.0 8.110 0.3
269 3.373 3.347 879.71 -8.0 8.089 0.3
270 3.313 3.287 884.59 -8.0 8.068 0.3
271 3.253 3.227 889.49 -8.0 8.047 0.3
272 3.193 3.167 894.39 -8.0 8.027 0.3
273 3.133 3.107 899.29 -8.0 8.006 0.3
274 3.073 3.047 904.21 -8.0 7.986 0.3