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Add simulation of pions in HMS/SHMS collimators
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| subroutine mc_hms_coll(m2,p,p_spec,decay_flag,dflag,success, | ||
| - coll_flag,pathlen) | ||
| CDJG Subroutine to step a particle "through" the collimator,checking for | ||
| CDJG energy loss, multiple scattering. If particle doesn't make it (too | ||
| CDJG much energy loss for example), returns .FALSE. | ||
| ! TH - collimator thickness ~6.3 cm. He uses 20 steps for some reason | ||
| ! TH Why not..seems ok. Note that keep going even if the particle | ||
| ! TH is outside entrance specs. | ||
| implicit none | ||
| include 'apertures_hms.inc' | ||
| include 'struct_hms.inc' | ||
| include '../spectrometers.inc' | ||
| real*8 m2,p,p_spec | ||
| logical decay_flag, dflag,success,coll_flag | ||
| real*8 grnd | ||
| real*8 h_entr,h_exit,v_entr,v_exit | ||
| real*8 x_off,y_off,z_off | ||
| parameter (h_entr = 4.575) | ||
| parameter (v_entr = 11.646) | ||
| parameter (h_exit = 4.759) | ||
| parameter (v_exit = 12.114) | ||
| parameter (x_off = 0.000) | ||
| parameter (y_off = +0.028) | ||
| parameter (z_off = +40.17) | ||
| integer nstep | ||
| parameter(nstep=20) | ||
| real*8 coll_thick,coll_dens,zcoll,acoll,coll_radl,coll_radw | ||
| real*8 pathlen | ||
| parameter(coll_thick = 6.30) | ||
| parameter(coll_dens = 17.0) | ||
| parameter(zcoll = 69.45) | ||
| parameter(acoll = 171.56797) | ||
| parameter(coll_radl = 0.41753) | ||
| real*8 step_size,h_step,v_step | ||
| logical step_flag | ||
| logical slit_h_flag,slit_v_flag,slit_o_flag,rantemp_flag,epart_flag | ||
| real*8 epart,trans,eloss_tot,eloss,rantemp | ||
| real*8 thick,thick_temp | ||
| integer n | ||
| eloss_tot=0. | ||
| eloss=0. | ||
| step_size = 6.30/nstep | ||
| coll_flag = .FALSE. | ||
| success = .FALSE. | ||
| slit_h_flag = .FALSE. | ||
| slit_v_flag = .FALSE. | ||
| slit_o_flag = .FALSE. | ||
| rantemp_flag = .FALSE. | ||
| epart_flag = .FALSE. | ||
| h_step = h_entr | ||
| v_step = v_entr | ||
| epart = sqrt(p**2+m2) | ||
| C Now start stepping | ||
| C Check aperture, if part. hits collimator, do multiple scattering,eloss | ||
| C for next step and then project. | ||
| do n=1,nstep | ||
| step_flag = .FALSE. | ||
| if (abs(ys-y_off).gt.h_step) then | ||
| coll_flag = .TRUE. | ||
| step_flag = .TRUE. | ||
| hSTOP_slit_hor = hSTOP_slit_hor + 1 | ||
| slit_h_flag = .TRUE. | ||
| thick_temp = step_size | ||
| endif | ||
| if (abs(xs-x_off).gt.v_step) then | ||
| coll_flag = .TRUE. | ||
| step_flag = .TRUE. | ||
| hSTOP_slit_vert = hSTOP_slit_vert + 1 | ||
| slit_v_flag = .TRUE. | ||
| thick_temp=step_size | ||
| endif | ||
| if (abs(xs-x_off).gt.(-v_step/h_step*abs(ys-y_off)+3*v_step/2)) then | ||
| coll_flag = .TRUE. | ||
| step_flag = .TRUE. | ||
| hSTOP_slit_oct = hSTOP_slit_oct + 1 | ||
| slit_o_flag = .TRUE. | ||
| thick_temp = step_size | ||
| endif | ||
| thick = thick_temp | ||
| C If we hit the collimator, check for hadronic reaction, do eloss, mult. scat. for first step | ||
| if(step_flag) then | ||
| c TH - un-comment the following line if want no collimator punch through! | ||
| c goto 500 | ||
| if(m2.gt.12000. .and. m2.lt.20000.) then !check if pion - if muon, don't check for hadronic interaction | ||
| call pion_coll_absorb(p,thick,trans) | ||
| rantemp = grnd() | ||
| if(rantemp.gt.trans) then | ||
| rantemp_flag = .TRUE. | ||
| goto 500 | ||
| endif | ||
| endif | ||
| coll_radw = thick/coll_radl | ||
| ! TH - some adjustment here for multiple scattering test | ||
| c call musc(m2,p,coll_radw,thick,dydzs,dxdzs) | ||
| call musc(m2,p,coll_radw,dydzs,dxdzs) | ||
| epart = sqrt(p**2+m2) | ||
| call enerloss_new(thick,coll_dens,zcoll,acoll,epart, | ||
| $ sqrt(m2),1,eloss) | ||
| epart = epart - eloss | ||
| eloss_tot = eloss_tot + eloss | ||
| if(epart.lt.sqrt(m2)) then | ||
| epart_flag = .TRUE. | ||
| goto 500 | ||
| endif | ||
| p = sqrt(epart**2-m2) | ||
| dpps = 100.*(p/p_spec - 1.) | ||
| endif | ||
|
|
||
| call project(xs,ys,step_size,decay_flag,dflag,m2,p,pathlen) !drift and decay | ||
|
|
||
| h_step = h_step + (h_exit-h_entr)/nstep | ||
| v_step = v_step + (v_exit-v_entr)/nstep | ||
| c write(6,*) 'step,eloss',n,eloss,step_flag,pathlen | ||
| enddo | ||
|
|
||
| success = .TRUE. | ||
|
|
||
| 500 continue | ||
| c write(6,*) 'step,eloss',n,eloss_tot,success,coll_flag,step_flag,xs,ys | ||
| c if (.not.success) then | ||
| c write(6,*) rantemp_flag,trans,epart_flag,eloss,slit_h_flag,slit_v_flag,slit_o_flag | ||
| c endif | ||
| c write(6,*) 'leaving collimator...',p,success,coll_flag,step_flag | ||
| c if (abs(xs).gt.0.5 .or. abs(ys).gt.0.5) write(6,*) 'xy ',xs,ys | ||
|
|
||
| return | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| subroutine pion_coll_absorb(ppi,thick,transmission) | ||
| c Subroutine to calculate probability that pion will be absorbed in the SOS | ||
| c collimator - can be used for HMS assuming same geometry applies. TH - checked that. | ||
|
|
||
| C DJG For now, I use the "reaction" cross sections. Also, only implemented for | ||
| C DJG pi+ - no pi-. | ||
|
|
||
| ! TH - cross section from Dave's parameterization of the energy and A dependence up to | ||
| ! TH pion momenta of ~ 2 GeV, we extended that to > 2 GeV during Fpi analysis | ||
| implicit none | ||
| real*8 Ppi,Epi,Tpi,mpi !pion kinematics | ||
| real*8 Navagadro | ||
| parameter(Navagadro = 6.0221367d+23) | ||
| parameter(mpi = 139.56995) | ||
| real*8 mate_dens | ||
| real*8 mate_t | ||
| real*8 mate_A | ||
| real*8 T(14),sigreac(14),qreac(14) | ||
| real*8 sighi,siglo,qhi,qlo,transmission,lambdai,thick | ||
| real*8 Tlo,Thi,sigA,sigAlo,sigAhi,sum | ||
| integer i | ||
| ! TH - DG original + TH extension for > 2GeV | ||
| data T /85.0,125.0,165.0,205.0,245.0,315.0,584.02,711.95,870.12, | ||
| > 1227.57,1446.58,1865.29,2858.0,4159.0/ | ||
| CCCCCCCCCC TOTAL CROSS SECTIONS CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC | ||
| ! data sigreac /170.12,189.49,178.61,158.11,116.9,85.86,55.5,55.5, | ||
| ! > 55.5,55.5,55.5,55.5,55.5,55.5/ | ||
| ! data qreac /0.59980,0.5753,0.58046,0.59842,0.65218,0.69421,.779 | ||
| ! > ,.779,.779,.779,.779,.779,0.779,0.779/ | ||
| CCCCCCCCCCCCC REACTION CROSS SECTIONS CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC | ||
| ! TH - DG Original + TH extension for > 2GeV | ||
| data sigreac /26.03,84.47,117.3,117.4,101.9,69.58,42.5,44.7,47.9, | ||
| > 46.5,45.2,39.6,35.34,33.15/ | ||
| data qreac /0.948,0.659,0.56,0.5342,0.5452,0.60796,0.699,0.689, | ||
| > 0.679,0.683,0.688,0.704,0.7483,0.7705/ | ||
| CCCCCCCCCCCCC ABSORPTION(?) CROSS SECTIONS CCCCCCCCCCCCCCCCCCCCCCCCCCC | ||
| c data sigreac /8.81,25.57,29.57,30.245,15.63,8.302,4.98,4.98,4.98, | ||
| c > 4.98,4.98,4.98/ | ||
| c data qreac /0.986,0.763,0.744,0.679,0.762,0.6506,0.75,0.75, | ||
| c > 0.75,0.75,0.75,0.75/ | ||
| c data sigreac_minus /25.0,100.0,120.,110.0,100.0,80.0/ | ||
| c data qreac_minus /0.97,0.60,0.52,0.50,0.53,0.60/ | ||
| mate_dens = 17.0 !Collimator density (g/cm^3) | ||
| mate_t = 6.35 !Total aluminum seen by pion(cm) | ||
| mate_A = 171.57 | ||
| Epi = sqrt(Ppi**2+mpi**2) | ||
| Tpi = Epi - mpi | ||
| sigA = 0.0 | ||
| c do i = 1,14 | ||
| c GH changed this to 13, there are only 14 elements, so the T(i+1) check should fail for i=14 | ||
| do i = 1,13 | ||
| if((Tpi.gt.T(i)).and.(Tpi.le.T(i+1))) then | ||
| Thi = T(i+1) | ||
| Tlo = T(i) | ||
| sighi = sigreac(i+1) | ||
| siglo = sigreac(i) | ||
| qhi = qreac(i+1) | ||
| qlo = qreac(i) | ||
| sigAhi = sighi*mate_A**qhi | ||
| sigAlo = siglo*mate_A**qlo | ||
| sigA = (sigAlo*(Thi-Tpi) + sigAhi*(Tpi-Tlo))/(Thi-Tlo) | ||
| sigA = sigA*1.d-27 !convert to cm^2 | ||
| endif | ||
| enddo | ||
| c GH if pion kinetic energy is greater than T(14)=4159 MeV, then use T(14) parameters | ||
| if (Tpi.gt.T(14)) then | ||
| sigA = sigreac(14)*mate_A**qreac(14) | ||
| sigA = sigA*1.d-27 | ||
| c write(6,*)' coll: pion K.E. limit ',Tpi | ||
| endif | ||
| sum = 0.0 | ||
| lambdai = mate_dens*Navagadro*sigA/mate_A | ||
| sum = sum + thick*lambdai | ||
| transmission = exp(-sum) | ||
| end | ||
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