source: trunk/examples/novice/gemc/src/bst_strip.cc@ 1190

Last change on this file since 1190 was 807, checked in by garnier, 17 years ago

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[807]1// %%%%%%%%%%%%%
2// gemc headers
3// %%%%%%%%%%%%%
4#include "bst_strip.h"
5
6#include <iostream>
7#include <cmath>
8#include <cstdlib>
9
10void bst_strip::fill_infos()
11{
12 // all dimensions are in mm
13
14 Pi = 3.14159265358;
15 interlayer = 2.75; // distance between 2 layers of a superlayer
16
17 alpha = 1.5*Pi/180; // angle of the strips
18 pitch = 0.150; // pitch of the strips
19
20 // number of sectors for each layer
21 Nsector.push_back(8); Nsector.push_back(8);
22 Nsector.push_back(12); Nsector.push_back(12);
23 Nsector.push_back(18); Nsector.push_back(18);
24 Nsector.push_back(24); Nsector.push_back(24);
25
26 // number of cards by sector for each layer
27 Ncards.push_back(1); Ncards.push_back(1);
28 Ncards.push_back(2); Ncards.push_back(2);
29 Ncards.push_back(3); Ncards.push_back(3);
30 Ncards.push_back(3); Ncards.push_back(3);
31
32 // z of the upstream part of the layer
33 Z0.push_back(-39.219); Z0.push_back(-39.219);
34 Z0.push_back(-111.319); Z0.push_back(-111.319);
35 Z0.push_back(-164.787); Z0.push_back(-164.787);
36 Z0.push_back(-107.070); Z0.push_back(-107.070);
37
38 // radii of layers
39 R.push_back(101.129/2); R.push_back(R[0]+interlayer);
40 R.push_back(156.853/2); R.push_back(R[2]+interlayer);
41 R.push_back(238.869/2); R.push_back(R[4]+interlayer);
42 R.push_back(320.268/2); R.push_back(R[6]+interlayer);
43
44 // mid angle of the sector
45 MidTile.push_back(0); MidTile.push_back(0);
46 MidTile.push_back(0); MidTile.push_back(0);
47 MidTile.push_back(Pi/18); MidTile.push_back(Pi/18);
48 MidTile.push_back(0); MidTile.push_back(0);
49
50
51 DZ_inLength = 0.934; // size of the band of dead zones all around in the length of the card
52 DZ_inWidth = 0.934; // size of the band of dead zones all around in the width of the card
53 CardLength = 111.625; // length of 1 card
54 CardWidth = 41.7; // width 1 card
55
56 // Number of strips
57 NstripsZ = (int) floor((CardWidth-2.0*DZ_inLength-(CardLength-2*DZ_inWidth)*tan(alpha))*cos(alpha)/pitch);
58 Nstrips = (int) floor((CardWidth-2.0*DZ_inLength)/pitch);
59
60}
61
62
63void bst_strip::FindCard(int layer, double Z)
64{
65 if(Z>Z0[layer] && Z<Z0[layer]+Ncards[layer]*CardLength)
66 {
67 // get the card index
68 nCard = (int) floor((Z-Z0[layer])/CardLength);
69
70 // redefine z to the global coordinate on the first card.
71 // If it's the middle card z becomes the distance to the right edge.
72 if((nCard%2)==0) z = Z - nCard*CardLength;
73 if((nCard%2)==1) z = Z0[layer] + (nCard+1)*CardLength - Z + Z0[layer];
74
75 // now hit is in the 1st card of the tile! let's check it
76 if(z<Z0[layer] || z>Z0[layer]+CardLength)
77 {
78 cout << " Warning: z not within first card. This should never happen! z = " << z << ", card = " << nCard << endl;
79 exit(0);
80 }
81 }
82}
83
84
85int bst_strip::FindStripZ(int layer, int sector, double X, double Y)
86{
87 x = X;
88 y = Y;
89
90 double mindist = 999.; // min distance between the points and strips
91 double dist = 999.; // distance to current strip
92 int ClosestStrip = -1; // number of the closest strip
93
94 int IsOK = 0;
95 const int MAXNSTRIP = 1024;
96 if(NstripsZ > MAXNSTRIP)
97 {
98 cout << " Warning: number of strips > 1024. Exiting. " << endl;
99 exit(0);
100 }
101
102 double Px[MAXNSTRIP], Py[MAXNSTRIP], Pz[MAXNSTRIP];
103 double Pxp[MAXNSTRIP], Pyp[MAXNSTRIP], Pzp[MAXNSTRIP];
104
105
106 for(int k=0; k<NstripsZ; k++)
107 {
108 Px[k] = (R[layer]/cos(0.5*(CardWidth/R[layer])))*cos(MidTile[layer] +
109 2.0*sector*Pi/Nsector[layer] + 0.5*CardWidth/R[layer]) + DZ_inLength*sin(MidTile[layer] +
110 2.0*sector*Pi/Nsector[layer]) + (pitch*k/cos(alpha))*sin(MidTile[layer] +
111 2.0*sector*Pi/Nsector[layer]);
112 Py[k] = (R[layer]/cos(0.5*(CardWidth/R[layer])))*sin(MidTile[layer] +
113 2.0*sector*Pi/Nsector[layer] + 0.5*CardWidth/R[layer]) - DZ_inLength*cos(MidTile[layer] +
114 2.0*sector*Pi/Nsector[layer]) - (pitch*k/cos(alpha))*cos(MidTile[layer] +
115 2.0*sector*Pi/Nsector[layer]);
116 Pz[k] = Z0[layer]+DZ_inWidth;
117
118
119 Pxp[k] = (R[layer]/cos(0.5*(CardWidth/R[layer])))*cos(MidTile[layer]
120 + 2.0*sector*Pi/Nsector[layer] - 0.5*CardWidth/R[layer])-DZ_inLength*sin(MidTile[layer]
121 + 2.0*sector*Pi/Nsector[layer]) - (pitch*k/cos(alpha))*sin(MidTile[layer]
122 + 2.0*sector*Pi/Nsector[layer]);
123 Pyp[k] = (R[layer]/cos(0.5*(CardWidth/R[layer])))*sin(MidTile[layer]
124 + 2.0*sector*Pi/Nsector[layer] - 0.5*CardWidth/R[layer])+DZ_inLength*cos(MidTile[layer]
125 + 2.0*sector*Pi/Nsector[layer]) + (pitch*k/cos(alpha))*cos(MidTile[layer]
126 + 2.0*sector*Pi/Nsector[layer]);
127 Pzp[k] = Z0[layer]+DZ_inWidth;
128
129 // W layer
130 if((layer%2)==0)
131 {
132 dist = fabs( - sin(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(alpha)*x
133 + cos(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(alpha)*y
134 + sin(alpha)*z
135 + sin(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(alpha)*Px[k]
136 - cos(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(alpha)*Py[k]
137 - sin(alpha)*Pz[k]);
138
139 if(dist<mindist)
140 {
141 mindist = dist;
142 ClosestStrip = k;
143 }
144 }
145
146 // V layer
147 if((layer%2)==1)
148 {
149 dist = fabs( - sin(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(-alpha)*x
150 + cos(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(-alpha)*y
151 + sin(-alpha)*z
152 + sin(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(-alpha)*Pxp[k]
153 - cos(MidTile[layer] + sector*2.0*Pi/Nsector[layer])*cos(-alpha)*Pyp[k]
154 - sin(-alpha)*Pzp[k]);
155
156 if(dist<mindist)
157 {
158 mindist = dist;
159 ClosestStrip = k;
160 }
161 }
162 }
163 if(mindist<pitch/2. && z>Z0[layer]+DZ_inWidth && z<Z0[layer]+CardLength-DZ_inWidth) IsOK = 1;
164 else IsOK = 0;
165
166 if(IsOK) return ClosestStrip;
167 else return -1;
168
169}
170
171
172
173int bst_strip::FindStrip(int layer, int sector, double X, double Y, double Z)
174{
175 x = X;
176 y = Y;
177 z = Z;
178
179 double mindist = 999.; // min distance between the points and strips
180 double dist = 999.; // distance to current strip
181 int ClosestStrip = -1; // number of the closest strip
182 int IsOK = 0;
183 const int MAXNSTRIP = 1024;
184
185 if(Nstrips > MAXNSTRIP)
186 {
187 cout << " Warning: number of strips > 1024. Exiting. " << endl;
188 exit(0);
189 }
190
191 double Px[MAXNSTRIP], Py[MAXNSTRIP], Pz[MAXNSTRIP];
192 double Pxp[MAXNSTRIP], Pyp[MAXNSTRIP], Pzp[MAXNSTRIP];
193 double alpha_k;
194
195 // particle is in the z-acceptance
196 if(z>Z0[layer]+DZ_inWidth && z<Z0[layer]+Ncards[layer]*CardLength-DZ_inWidth)
197 {
198
199 for(int k=0; k<Nstrips; k++)
200 {
201 alpha_k = k/((float)(Nstrips-1))*alpha;
202 Px[k] = (R[layer]/cos(atan(0.5*(CardWidth/R[layer]))))*cos(MidTile[layer] +
203 2.0*sector*Pi/Nsector[layer]+atan(0.5*CardWidth/R[layer]))+DZ_inLength*sin(MidTile[layer] +
204 2.0*sector*Pi/Nsector[layer])+(pitch*k)*sin(MidTile[layer]+sector*2.0*Pi/Nsector[layer]);
205 Py[k] = (R[layer]/cos(atan(0.5*(CardWidth/R[layer]))))*sin(MidTile[layer] +
206 2.0*sector*Pi/Nsector[layer]+atan(0.5*CardWidth/R[layer]))-DZ_inLength*cos(MidTile[layer] +
207 2.0*sector*Pi/Nsector[layer])-(pitch*k)*cos(MidTile[layer]+sector*2.*Pi/Nsector[layer]);
208 Pz[k] = Z0[layer]+DZ_inWidth;
209
210 Pxp[k] = (R[layer]/cos(atan(0.5*(CardWidth/R[layer]))))*cos(MidTile[layer] +
211 2.0*sector*Pi/Nsector[layer]-atan(0.5*CardWidth/R[layer]))-DZ_inLength*sin(MidTile[layer] +
212 2.0*sector*Pi/Nsector[layer])-(pitch*k)*sin(MidTile[layer]+sector*2.*Pi/Nsector[layer]);
213 Pyp[k] = (R[layer]/cos(atan(0.5*(CardWidth/R[layer]))))*sin(MidTile[layer] +
214 2.0*sector*Pi/Nsector[layer]-atan(0.5*CardWidth/R[layer]))+DZ_inLength*cos(MidTile[layer] +
215 2.0*sector*Pi/Nsector[layer])+(pitch*k)*cos(MidTile[layer]+sector*2.*Pi/Nsector[layer]);
216 Pzp[k] = Z0[layer]+DZ_inWidth;
217
218 if((layer%2)==0)
219 {
220 dist = fabs(-sin(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(alpha_k)*x +
221 cos(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(alpha_k)*y +
222 sin(alpha_k)*z +
223 sin(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(alpha_k)*Px[k] -
224 cos(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(alpha_k)*Py[k] -
225 sin(alpha_k)*Pz[k]);
226 if(dist<mindist)
227 {
228 mindist = dist;
229 ClosestStrip = k; // record strip number
230 }
231 }
232
233 if((layer%2)==1)
234 {
235 dist = fabs(-sin(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(-alpha_k)*x +
236 cos(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(-alpha_k)*y +
237 sin(-alpha_k)*z +
238 sin(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(-alpha_k)*Pxp[k] -
239 cos(MidTile[layer]+sector*2.0*Pi/Nsector[layer])*cos(-alpha_k)*Pyp[k] -
240 sin(-alpha_k)*Pzp[k]);
241 if(dist<mindist)
242 {
243 mindist = dist;
244 ClosestStrip = k; // record strip number
245 }
246 }
247 }
248 if(mindist < (pitch+(Ncards[layer]*CardLength-2.*DZ_inWidth)*alpha/(Nstrips-1)*(1.+tan(alpha)*tan(alpha)))/2. &&
249 z>Z0[layer]+DZ_inWidth &&
250 z<Z0[layer]+Ncards[layer]*CardLength-DZ_inWidth &&
251 sqrt(x*x+y*y)<R[layer]/cos(atan((0.5*CardWidth-DZ_inLength)/R[layer]))) IsOK = 1;
252 else IsOK = 0;
253 }
254 else
255 {
256 // particle not in the z-acceptance
257 IsOK = 0;
258 ClosestStrip = -1;
259 }
260
261 if(IsOK) return ClosestStrip;
262 else return -1;
263
264}
265
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