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1 jones 1.1 subroutine gukine 2 c
3 brash 1.2 c 4 c This is a subroutine to generate (x,y,theta,phi,delta-p) at 5 c the focal plane for proton from the H(e,e'p) reaction. 6 c It makes use of a simple kinematics routine, some knowledge 7 c of the extended target acceptances, and polynomials for the 8 c transport through the spectrometer from John Lerose.
9 jones 1.1 c 10 implicit none 11 integer ikine,itra,istak,ivert,ipart,itrtyp,napart,ipaold 12 real pkine,amass,charge,tlife,vert,pvert 13 common/gckine/ikine,pkine(10),itra,istak,ivert,ipart,itrtyp 14 + ,napart(5),amass,charge,tlife,vert(3),pvert(4),ipaold 15 integer nubuf 16 parameter (nubuf=10) 17 real ubuf(nubuf),rndm(3) 18 integer ntbeam,nttarg,nvtx 19 save nvtx 20 real plab(3),ptot,etot 21 real*8 ang,angr,phi,phir,psir
22 brash 1.2 real mp,ea,pa,remain
23 brash 1.4 real r2,r3
24 jones 1.1 integer nt,ierri,i0,i1,i2,i3
25 brash 1.2 integer i,j,k,ichoice,ichoice2,iremain
26 jones 1.1 real*8 rotmat,xyz(3),xyznew(3),termang 27 integer ic,ii,jj
28 brash 1.2 integer*4 junk1,ikinsetting
29 jones 1.1 real8 xfp,yfp,tthfp,tphfp,pfp,junk2,junk3,thfp,phfp 30 real8 e0(10),eang(10),hang(10),targ_thick(10)
31 brash 1.2 real*8 xtgt,ytgt,thtgt,phtgt,ptgt,dptgt
32 brash 1.4 real yf,ff,thetaf
33 jones 1.1 character*80 junkline 34 c
35 brash 1.4 c The following variables are the SIMC variables 36 c 37 real8 x,y,z !(cm) 38 real8 dpp !delta p/p (%) 39 real8 dxdz,dydz !X,Y slope in spectrometer 40 real8 x_fp,y_fp,dx_fp,dy_fp !Focal plane values to return 41 real8 p_spec,th_spec !spectrometer setting 42 real8 fry !vertical position@tgt (+y=down) 43 real8 pathlen 44 logical ms_flag !mult. scattering flag 45 logical wcs_flag !wire chamber smearing flag 46 logical decay_flag !check for particle decay 47 logical ok_spec !true if particle makes it 48 real8 resmult,m2 49 c
50 jones 1.1 include 'fpp_local.h' 51 include 'geant_local.h' 52 c 53 c include 'parameter.h' 54 c include 'espace_type.h' 55 c include 'detector.h' 56 c include 'transport.h' 57 c include 'option.h' 58 c
59 brash 1.2 common/kincom/rotmat(3,3) 60 call grndm ( rndm , 3 )
61 jones 1.1 c
62 brash 1.2 111 format(a80) 63 iremain=nevent/1000 64 remain=nevent/1000.0 65 c if(iremain.eq.remain) write(,)'nevent =',nevent
66 jones 1.1 write(,)'nevent =',nevent 67 68 if(nevent.eq.0) then
69 brash 1.2 c write(,)'Getting kinematics setting ...'
70 jones 1.1 open(unit=1,file='geant_kinematics.dat',type='UNKNOWN') 71 read(1,)ikinsetting 72 close(unit=1) 73 open(unit=1,file='hdr_gep.dat',status='old') 74 do i=1,10 75 read(1,)e0(i),eang(i),hang(i),targ_thick(i) 76 enddo 77 einc=e0(ikinsetting) 78 hrse_ang=eang(ikinsetting) 79 hrsh_ang=-1.0*hang(ikinsetting)
80 brash 1.2 trg_thk=targ_thick(ikinsetting)
81 jones 1.1 close(unit=1) 82 endif 83
84 brash 1.2 c 85 c Now we have the incident electron energy and the angles of 86 c the two spectrometers, as well as the target thickness. 87 c We need to use a) kinematics routines and b) some knowledge 88 c of the extended target acceptances to choose the x,y,theta,phi, 89 c and dpmom at the target. 90 c 91 call kincalc(einc,hrse_ang,hrsh_ang,trg_thk,xtgt,ytgt, 92 $ thtgt,phtgt,ptgt,dptgt) 93 94 c 95 c At this point, after using polynomials from Lerose, we should 96 c have x,y,theta,phi, and dpmom at the focal plane. 97 c 98 c write(,)'Back from kincalc ...' 99 c write(,)xtgt,ytgt,thtgt,phtgt,dptgt
100 brash 1.4 c x(1)=tan(phtgt) 101 c x(2)=ytgt 102 c x(3)=tan(thtgt) 103 c x(4)=dptgt
104 brash 1.2 y_target=ytgt*100.0
105 brash 1.4 c 106 c Here is where we call the SIMC routines to calculate the focal plane 107 c quantities from the target quantities. 108 c 109 c xfp=xfinal(x,4)100.0 110 c phfp=atan(thetaf(x,4))/3.14159265180.0 111 c yfp=yf(x,4)100.0 112 c thfp=atan(ff(x,4))/3.14159265180.0 113 p_spec=ptgt 114 th_spec=hrsh_ang 115 dpp=dptgt100.00 116 x=xtgt 117 y=ytgt 118 z=0.0 119 dxdz=tan(phtgt3.14159265/180.0) 120 dydz=tan(thtgt3.14159265/180.0) 121 c write(,)p_spec,th_spec,dpp 122 c write(,)x,y,z 123 c write(,)dxdz,dydz 124 c 125 c Call to SIMC routine 126 brash 1.4 c 127 decay_flag=.false. 128 wcs_flag=.false. 129 ms_flag=.false. 130 m2=(938.27962) 131 call mc_hms (p_spec, th_spec, dpp, x, y, z, dxdz, dydz, 132 > x_fp, dx_fp, y_fp, dy_fp, m2, 133 > ms_flag, wcs_flag, decay_flag, resmult, fry, 134 > ok_spec, pathlen) 135 c write(,)p_spec,th_spec,dpp 136 c write(,)x,y,z 137 c write(,)dxdz,dydz 138 write(6,)x_fp,dx_fp,y_fp,dy_fp,ok_spec 139 c write(,)m2,ms_flag,wcs_flag,decay_flag 140 c write(,)resmult,fry,ok_spec,pathlen 141 142 xfp=x_fp 143 phfp=atan(dx_fp)/3.14159265180.0 144 yfp=y_fp 145 thfp=atan(dy_fp)/3.14159265180.0 146 c 147 brash 1.4 do ii=1,20 148 ntuple_array(ii)=0.0 149 enddo 150 ntuple_array(11)=real(xfp) 151 ntuple_array(12)=real(yfp) 152 ntuple_array(13)=real(thfp) 153 ntuple_array(14)=real(phfp) 154 c
155 brash 1.3 pcentral=ptgt
156 brash 1.4 pfp=dptgt 157 c 158 c
159 brash 1.2 c write(,)'Focal plane quantities ...' 160 c write(,)xfp,yfp,thfp,phfp,pcentral,pfp 161 162 c xfp=xtgt ! in cm 163 c yfp=ytgt ! in cm 164 c thfp=thtgt/3.14159265180.0 ! in degrees 165 c phfp=phtgt/3.14159265180.0 ! in degrees 166 c pcentral=ptgt ! in MeV/c 167 c pfp=dptgt ! fraction of central momentum 168 c 169 c Finally, we convert this information over to a format that GEANT likes. 170 c
171 jones 1.1
172 brash 1.2 1135 dpmom=pfp 173 pfp=pcentral(1.0+pfp) 174 pmom=pfp 175 ea=sqrt(pfp2+938.2796*2) 176 tinit=ea-938.2796 177 vert(1)=xfp 178 vert(2)=yfp 179 vert(3)=0.0 180 ntbeam = 0.0 181 nttarg = 0.0 182 ubuf(1) = 0.0 183 184 1000 continue 185 c 186 ipart = 14 ! geant pid (8=pi+,9,pi-, 14 =p) 187 ptot=pfp/1000.
188 jones 1.1 call grndm ( rndm , 3 )
189 brash 1.2 angr=thfp3.14159265/180.0 190 phir=phfp3.14159265/180.0 191 psir=datan(dtan(phir)*dcos(angr)) 192 193 ang=thfp 194 phi=phfp
195 jones 1.1 c
196 brash 1.2 c these are the actual parameters for the track.
197 jones 1.1 c
198 brash 1.2 xinit=vert(1) 199 yinit=vert(2) 200 thinit=angr 201 phiinit=phir 202 203 c sptransport.l.particle.fp_h.ph=dtan(angr) 204 c sptransport.l.particle.fp_h.th=dtan(phir) 205 c 206 c sptransport.l.particle.fp_h.x=vert(1)/100.0 207 c 208 c sptransport.l.particle.fp_h.y=vert(2)/100.0
209 jones 1.1 c 210 c
211 brash 1.2 c next we misalign the track to simulate misalignment of the 212 c entire space frame with respect to the vdc's
213 jones 1.1 c
214 brash 1.2 c just include the translational offsets to start
215 jones 1.1 c
216 brash 1.2 c write(,)vert(1),vert(2),angr,phir,psir 217 218 xofff=0.0 219 yofff=0.0 220 thofff=0.0 221 phofff=0.0 222 psofff=0.0 223 c 224 c Define the inverse Euler rotation for (thofff,phiofff,psiofff) 225 c 226 c 227 rotmat(1,1)=dcos(psofff)dcos(thofff)+dsin(psofff)dsin(thofff) 228 $ dsin(phofff) 229 rotmat(1,2)=-dcos(phofff)dsin(thofff) 230 rotmat(1,3)=-dsin(psofff)dcos(thofff)+dcos(psofff)dsin(thofff) 231 $ dcos(phofff) 232 rotmat(2,1)=dcos(psofff)dsin(thofff)-dsin(psofff)dcos(thofff) 233 $ dsin(phofff) 234 rotmat(2,2)=dcos(phofff)dcos(thofff) 235 rotmat(2,3)=-dsin(psofff)dsin(thofff)-dcos(psofff)dcos(thofff) 236 $ dsin(phofff) 237 brash 1.2 rotmat(3,1)=dsin(psofff)dcos(phofff) 238 rotmat(3,2)=dsin(phofff) 239 rotmat(3,3)=dcos(psofff)dcos(phofff) 240 c 241 c 242 vert(1)=vert(1)-xofff 243 vert(2)=vert(2)-yofff 244 c 245 xyz(1)=dsin(psir) 246 xyz(2)=dcos(psir)dsin(angr) 247 xyz(3)=dcos(psir)dcos(angr) 248 c 249 do ic=1,3 250 xyznew(ic)=xyz(1)rotmat(ic,1)+ 251 & xyz(2)rotmat(ic,2)+xyz(3)rotmat(ic,3) 252 enddo 253 254 angr=datan(xyznew(2)/xyznew(3)) 255 termang=xyznew(3)/dcos(angr) 256 if(termang.gt.1.0) termang=1.0 257 if(termang.lt.-1.0) termang=-1.0 258 brash 1.2 psir=dacos(termang)abs(xyznew(1))/xyznew(1) 259 phir=datan(dtan(psir)/dcos(angr)) 260 261 c write(,)vert(1),vert(2),angr,phir,psir
262 jones 1.1 263 call gsvert ( vert,ntbeam,nttarg,ubuf,0,nvtx )
264 brash 1.2 etot = ea - 938.2796
265 jones 1.1 plab(1) = ptotdsin(psir) 266 plab(2) = ptotdsin(angr)dcos(psir) 267 plab(3) = ptotdcos(angr)*dcos(psir)
268 brash 1.2
269 jones 1.1 call hfill ( 100, etot, 0., 1. )
270 brash 1.2
271 jones 1.1 call gskine ( plab,ipart,nvtx,ubuf,0,nt )
272 brash 1.2
273 jones 1.1 if ( nt.le.0 ) then 274 write ( 6,* ) ' gukine: error defining track' 275 write ( 6,* ) ' i=',i,' nt=',nt 276 stop 277 end if
278 brash 1.2 279 nevent=nevent+1 280
281 jones 1.1 return
282 brash 1.2 283 end 284 285 subroutine kincalc(e0,eang,hang,trg,xtgt,ytgt, 286 $ thtgt,phtgt,ptgt,dptgt) 287 288 implicit none 289 290 real8 e0,eang,hang,trg,xtgt,ytgt,thtgt,phtgt,ptgt,dptgt 291 real8 fg,gf 292 integer i,j,k 293 real8 mt,mtg,mr,mpi,mn,mp,me,pi,mhe,alpha 294 real8 escat,pscat,pcentral,thetae,phie,thetap,phip 295 real rndm(3) 296 297 fg=3.14159265/180.0 298 gf=1.0/fg 299 300 me = 0.511 301 mpi = 139.57 302 mp = 938.2796 303 brash 1.2 mn = 939.5731 304 mhe = 2808.41 305 mt = mp 306 mtg = mt/1.e3 307 308 alpha=1./137. 309 310 311 1432 call grndm ( rndm , 3 ) 312 escat=mp/(1.0+mp/e0-cos(fgeang)) 313 pscat=sqrt(e02+escat2- 314 $ 2.0e0escatcos(fgeang)) 315 pcentral=pscat 316 317 c First, we assume that whichever are is the more backward will 318 c determine the acceptance. We then randomly choose the theta 319 c and phi for the arm that determines the acceptance within the 320 c usual full HRS acceptance and then determine from kinematics 321 c what the corresponding theta and phi are for the other arm. 322 323 if (abs(eang).gt.abs(hang)) then 324 brash 1.2 phie=-.065+rndm(1).130 325 thetae=-.030+rndm(2).060 326 escat=mp/(1.0+mp/e0-cos(fgeang+thetae)cos(phie)) 327 pscat=sqrt(e02+escat2- 328 $ 2.0e0escatcos(fgeang+thetae)cos(phie)) 329 phip=dasin(escatdsin(phie)/pscat) 330 thetap=dasin((escatsin(fgeang+thetae)cos(phie))/ 331 $ (pscatcos(phip)))-fghang 332 else 333 c Hadron arm defining acceptance 334 1221 call grndm ( rndm, 3) 335 phie=-.065+rndm(1).130 336 thetae=-.030+rndm(2).060 337 escat=mp/(1.0+mp/e0-cos(fgeang+thetae)cos(phie)) 338 pscat=sqrt(e02+escat2- 339 $ 2.0e0escatcos(fgeang+thetae)cos(phie)) 340 phip=-1.0dasin(escatsin(phie)/pscat) 341 thetap=dasin((escatsin(fgeang+thetae)cos(phie))/ 342 $ (pscatcos(phip)))-fghang 343 if(abs(thetap).gt.0.030.or.abs(phip).gt.0.065) goto 1221 344 endif 345 brash 1.2 346 ptgt=pscat 347 dptgt=(pcentral-pscat)/pcentral
348 jones 1.1 c
349 brash 1.2 c Following statement to fill just the high and low dp bins 350 c which have very low statistics. This is normally commented 351 c out. 352 c 353 c if(abs(dptgt).le.0.030) goto 1432 354 c 355 thtgt=thetap 356 phtgt=phip 357 xtgt=0.0 358 ytgt=0.0 359 360 return
361 jones 1.1 end

Analyzer/Replay: Mark Jones, Documents: Stephen Wood