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bottai |
3.1 |
SUBROUTINE GPUDIFFUSION(IACT,TRAPAR,NUMVOL,DELOSS,STEP,ITYPAR) |
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******************************************************************************** |
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* |
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* To perform diffusion of electron and holes bunch inside the silicon |
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* detectors of the spectrometer |
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* |
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* Variables definition: |
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* IN: |
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* IACT, integer specifing the action to be taken. It is the INWVOL |
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* variable in GCTRAK common |
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* 0: Track is inside a volume |
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* 1: Entering a new volume or is a new track |
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* 2: Track is exiting current volume |
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* TRAPAR, track parameter, is the VECT vector in GCTRAK common (x,y,z..) |
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* NUMVOL, integr array of numbers identifying the DETECTOR (NUMBV di gustep) |
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* |
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* DELOSS, energy loss in the step (GeV) |
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* ITYPAR, id particella della traccia(vhit(9) che sarà iparspe nell'entupla finale) |
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* OUT: |
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* |
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* |
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* Called by: GPUSPE |
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* Author: Elena Taddei, 04/08/2005 , S. Bottai 30/01/06 |
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* |
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************************************************************************************* |
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#include "gpstripspe.inc" |
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#include "gpgeo.inc" |
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#include "gpgene.inc" |
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INTEGER IACT,NUMVOL(20) |
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REAL DELOSS, TRAPAR(7),xyzspa(3),VPOS(3),xyzspac(3) |
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REAL BMAGNET(3),STRPOSL(3),STRPOSG(3) |
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INTEGER ONCE |
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DATA ONCE /0/ |
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SAVE ONCE |
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IF(NUMVOL(1).NE.0) THEN |
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NSPEPLANE=NUMVOL(1) |
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ELSE IF(NUMVOL(1).EQ.0) THEN |
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NSPEPLANE=6 |
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ENDIF |
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VPOS(1)=TRAPAR(1)-STEP/2.*TRAPAR(4) |
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VPOS(2)=TRAPAR(2)-STEP/2.*TRAPAR(5) |
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VPOS(3)=TRAPAR(3)-STEP/2.*TRAPAR(6) |
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delossmev=deloss*1000. |
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call gmtod(VPOS,xyzspa,1) |
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zup=TSPA(3)-xyzspa(3) |
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zdown=TSPA(3)+xyzspa(3) |
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nearstripx=nearstx(xyzspa(1),xyzspa(2)) |
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if(nearstripx.ne.0) then |
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dx=xyzspa(1)-xstrip(nearstripx) |
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**************************************************************************** |
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* |
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* X-view strips collect holes, Y-view strips collect electrons. |
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* Both charge carriers are shifted due to the magnetic field. |
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* The shift for holes is significant, because it is |
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* orthogonal to read-out strips. |
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* A correction for this effect is introduced. |
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* v is along -Z; B is along -Y --> shift is along -X |
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* |
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***************************************************************************** |
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CALL GUFLD(VPOS,BMAGNET) |
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c |
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c to be checked |
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c |
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xshift=xyzspa(1)-zdown*hallmob*1.e-4*BMAGNET(2)/10. |
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IF(NSPEPLANE.EQ.6) xshift=xyzspa(1)+ |
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+ zdown*hallmob*1.e-4*BMAGNET(2)/10. |
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* |
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* Now widths of Gaussian functions can be calculated by means of |
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* the routine sigmadiffus, that gives sigma in m --> *100 --> cm |
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* |
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sigxi=amax1(0.00014,100.*sigmadiffus(zdown)) !perchè min=1.4 um? |
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* |
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* Sharing of the charge on strips. |
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* erf(x) from cernlib computes the (signed) integral of the gaussian |
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* function from -x to x (sigma=sqrt(1./2.), x0=0). If you have gaussian |
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* function with x0=a, sigma=b, area between -x and x is obtainable by the |
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* following formula: |
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* |
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* A = erf((x-a)/(sqrt(2.)*b)) A>0 if x-a>0; A<0 if x-a<0 |
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* |
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* erfc(x) (ALWAYS > 0) computes the complementary function, i.e. |
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* 2*integral between x and +infinity |
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* --> 0.5*erfc(x)=area of the gaussian between x to +inf. |
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* |
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NSTRIPLOW=MIN(23,NEARSTRIPX) |
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NSTRIPHIGH=MIN(15,NSTRIPX-NEARSTRIPX) |
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DO J=(NEARSTRIPX-NSTRIPLOW+8),(NEARSTRIPX+NSTRIPHIGH-6) |
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xqdivjm1=xstrip(j)-pitchx/2. |
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xqdivj=xstrip(j)+pitchx/2. |
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qfract=0.5*erfc((xqdivjm1-xshift)/(sqrt(2.)*sigxi)) |
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+ -0.5*erfc((xqdivj-xshift)/(sqrt(2.)*sigxi)) |
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proxtanti(NSPEPLANE,numvol(2),j)= |
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+ proxtanti(NSPEPLANE,numvol(2),j)+delossmev*qfract |
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IF(GLOBSTRIPX(NSPEPLANE,NUMVOL(2),J).EQ.0.) THEN |
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STRPOSL(1)=XSTRIP(J) |
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STRPOSL(2)=0. |
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STRPOSL(3)=0. |
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CALL GDTOM(STRPOSL,STRPOSG,1) |
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GLOBSTRIPX(NSPEPLANE,NUMVOL(2),J)=STRPOSG(1) |
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ENDIF |
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enddo |
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endif |
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nearstripy=nearsty(xyzspa(1),xyzspa(2)) |
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if(nearstripy.ne.0) then |
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dy=xyzspa(2)-ystrip(nearstripy) |
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sigyi=amax1(0.00023,100.*sigmadiffus(zup ) ) !perchè min=2.3 um? |
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* |
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* The standard deviation on the Y side is increased |
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* according to a parabolic behaviour + a constant term near p-stop |
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* |
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py=pitchy |
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if (abs(dy).lt.abs((py-psy2)/2.)) then |
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sigyi=sigyi-psy1*(dy**2)+(py-psy2)*psy1*abs(dy) |
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else |
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sigyi=sigyi-psy1*(((py-psy2)/2.)**2) |
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+ +(py-psy2)*psy1*abs((py-psy2)/2.) |
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endif |
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NSTRIPLOW=MIN(7,NEARSTRIPY) |
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NSTRIPHIGH=MIN(7,NSTRIPY-NEARSTRIPY) |
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do j=(NEARSTRIPY-NSTRIPLOW+1),(NEARSTRIPY+NSTRIPHIGH) |
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yqdivjm1=ystrip(j)-py/2. |
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yqdivj=ystrip(j)+py/2. |
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qfract=0.5*erfc((yqdivjm1-xyzspa(2))/(sqrt(2.)*sigyi)) |
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+ -0.5*erfc((yqdivj-xyzspa(2))/(sqrt(2.)*sigyi)) |
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proytanti(NSPEPLANE,numvol(2),j)= |
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+ proytanti(NSPEPLANE,numvol(2),j)+delossmev*qfract |
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IF(GLOBSTRIPY(NSPEPLANE,NUMVOL(2),J).EQ.0.) THEN |
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STRPOSL(1)=0. |
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STRPOSL(2)=YSTRIP(J) |
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STRPOSL(3)=0. |
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CALL GDTOM(STRPOSL,STRPOSG,1) |
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GLOBSTRIPY(NSPEPLANE,NUMVOL(2),J)=STRPOSG(2) |
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ENDIF |
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enddo |
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endif |
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END |
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* |
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* //////////////////////////////////////////////////////////////////////////////////////// |
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* |
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real function sigmadiffus(zp) |
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********************************************************************* |
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* Width of the Gaussian function due to diffusion spread is found. |
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* x,y,z : where charge is generated (position in given in cm) |
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* As output standard deviation (m) due to diffusion in silicon |
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* Diffusion coefficients are proportional to mobility: D=kTm/q, |
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* where m is mobility: this is true in the Internatinal System |
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* of units, not in GCS. We compute this quantity in the |
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* I.S. (renormalitation for m --> cm has been taken into account: |
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* zpsi=zp/100. ! cm --> m |
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* Efield=Efield*100. ! V/cm --> V/m --> 10^-4 ) |
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* WARNING!! Sigma is independent on the carrier mobility m, |
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* because hdiff = c*m but time = c/m. As a consequence, |
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* sigma is independent on the dopant concentration. |
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* E-h pairs created are mostly confined in a tube of about 1 um diameter. |
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********************************************************************** |
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#include "gpstripspe.inc" |
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zm=zp/100. ! cm --> m |
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Evm=ebias*100. ! V/cm --> V/m |
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vdepl=55. |
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vappl=70. |
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thick=3.e-4 |
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* |
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* timemu = collection time * mobility |
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* |
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timemu=abs(-(thick**2/(2.*vdepl))*log(1-(2*vdepl*zm)/ |
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+ ((vdepl+vappl)*thick))) |
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sigmadiffus=sqrt((2.*boltis*temperature*timemu)/eis)+dsigma |
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return |
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end |
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* //////////////////////////////////////////////////////////// |
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real function xstrip(j) |
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cv parameter......... |
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#include "gpstripspe.inc" |
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parameter (jlastx=2042) |
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parameter (xlast=5.333/2.-0.07315) |
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parameter (jfirstx=8) |
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parameter (xfirst=0.07315-5.333/2.) |
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px=pitchx |
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py=pitchy |
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if(j.lt.jfirstx.or.j.gt.jlastx) then |
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write(6,*) 'error , stripx=',j,'not existing' |
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xstrip=-1.e10 |
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endif |
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xstrip=(j-jfirstx)*px+xfirst |
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end |
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real function ystrip(j) |
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cv parameter......... |
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#include "gpstripspe.inc" |
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parameter (jlasty=1024) |
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parameter (ylast=7./2.-0.09855) |
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parameter (jfirsty=1) |
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parameter (yfirst=0.0985-7./2.) |
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px=pitchx |
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py=pitchy |
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if(j.lt.jfirsty.or.j.gt.jlasty) then |
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write(6,*) 'error , stripy=',j,'not existing' |
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ystrip=-1.e10 |
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endif |
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ystrip=(j-jfirsty)*py+yfirst |
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end |
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function nearstx(x,y) |
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cv parameter......... |
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#include "gpstripspe.inc" |
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parameter (jlastx=2042) |
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parameter (xlast=5.333/2.-0.07315) |
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parameter (jfirstx=8) |
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parameter (xfirst=0.07315-5.333/2.) |
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parameter (y1xstrip=0.1117-7./2.) |
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parameter (y2xstrip=7./2.-0.09) |
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px=pitchx |
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py=pitchy |
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if(x.lt.(xfirst-px/2.).or.x.gt.(xlast+px/2.)) then |
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nearstx=0 |
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return |
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endif |
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if(y.lt.y1xstrip.or.y.gt.y2xstrip) then |
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nearstx=0 |
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return |
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endif |
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nearstx=int((x-xfirst)/px)+jfirstx |
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if( (x-xstrip(nearstx)).gt.(px/2.) ) nearstx=nearstx+1 |
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end |
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function nearsty(x,y) |
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cv parameter......... |
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#include "gpstripspe.inc" |
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parameter (jlasty=1024) |
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parameter (ylast=7./2.-0.09855) |
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parameter (jfirsty=1) |
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parameter (yfirst=0.0985-7./2.) |
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parameter (x1ystrip=0.0894-5.333/2.) |
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parameter (x2ystrip=5.333/2.-0.1221) |
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px=pitchx |
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py=pitchy |
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if(y.lt.(yfirst-py/2.).or.y.gt.(ylast+py/2.)) then |
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nearsty=0 |
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return |
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endif |
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if(x.lt.x1ystrip.or.x.gt.x2ystrip) then |
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nearsty=0 |
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return |
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endif |
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nearsty=int((y-yfirst)/py)+jfirsty |
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if( (y-ystrip(nearsty)).gt.(py/2.) ) nearsty=nearsty+1 |
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end |
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