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*-- Author : Elena Taddei-Sergio Bottai 09/08/2005 |
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SUBROUTINE GPUCOLLECTION(np,nt) |
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*************************************************************************** |
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* * |
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* * |
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* * |
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* Here we calculate the signal appearing on each ADC channel * |
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* starting from the charge collected on every strip of the silicon * |
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* sensor. Noise is kept from data of beam test. Capacitive coupling * |
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* between strips and energy to ADC calibration are introduced too. * |
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* * |
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* * |
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* Called by: GPDSPE * |
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* * |
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*************************************************************************** |
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#include "gpstripspe.inc" |
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dimension stripqxtanti(nstripx) |
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dimension stripqytanti(nstripy) |
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********zeroing************** |
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do i=1,nstripx |
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stripqxtanti(i)=0. |
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enddo |
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do i=1,nstripy |
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stripqytanti(i)=0. |
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enddo |
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*************************** |
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if(NT.eq.1.or.NT.eq.4) LADD=1 |
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if(NT.eq.2.or.NT.eq.5) LADD=2 |
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if(NT.eq.3.or.NT.eq.6) LADD=3 |
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* |
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* Odd strip, X side --> charge shared between adjacent strips |
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* EFFCOUPL --> coupling efficiency (capacitance to backplane =0?) |
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* SHIFTMASK --> asymmetry in charge division on X view |
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* different in each sensor (mask) |
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do j=(1+8),(nstripx-7),2 |
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proxtanti(np,nt,j-1)= |
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+ proxtanti(np,nt,j-1)+ |
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+ 0.5*effcoupl*proxtanti(np,nt,j)*(1.-shiftmask) |
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proxtanti(np,nt,j+1)= |
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+ proxtanti(np,nt,j+1)+ |
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+ 0.5*effcoupl*proxtanti(np,nt,j)*(1.+shiftmask) |
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proxtanti(np,nt,j)=0. |
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enddo |
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* |
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* Capacitive coupling: a fraction of the charge arriving at one strip |
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* appears at the output of the neighbouring amplifiers |
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* This fraction is about Cis/Cdec, where Cis is the interstrip |
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* capacitance and Cdec is the decoupling capacitance (see Turchetta) |
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* An algorithm has been chosen that is precise for low values of the |
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* capacitive coupling, i.e. if the INDUCED charge on a given strip |
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* is little compared with the COLLECTED one. |
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* |
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******************** X side ************************* |
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c=cistrx/cdec |
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c2=cistrx2/cdec |
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do j=8,nstripx-6,2 ! only even strips on X side |
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jm2=1 |
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IF(j-2.lt.8) jm2=0 |
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jp2=1 |
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IF(j+2.gt.(nstripx-6)) jp2=0 |
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jm4=1 |
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IF(j-4.lt.8) jm4=0 |
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jp4=1 |
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IF(j+4.gt.(nstripx-6)) jp4=0 |
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stripqxtanti(j)=proxtanti(np,nt,j)*(1.-2.*(c+c2))+ |
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+ c*(1.-2.*c)*(jm2*proxtanti(np,nt,j-2) |
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+ +jp2*proxtanti(np,nt,j+2))+ |
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+ (c**2)*(jm4*proxtanti(np,nt,j-4)*(1.+c2/(c**2))+ |
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+ 2.*proxtanti(np,nt,j)+jp4*proxtanti(np,nt,j+4)*(1.+c2/(c**2))) |
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if(stripqxtanti(j).gt.1.e-8) then |
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NSTRPX=NSTRPX+1 |
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floatadcx=stripqxtanti(j)*xcalib |
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IF(NSTRPX.GT.MAXSTR) THEN |
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WRITE(6,*) 'ERROR - NSTRPX > MAXSTR' |
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NSTRPX=MAXSTR |
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ENDIF |
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NPSTRIPX(NSTRPX)=NP |
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NTSTRIPX(NSTRPX)=NT |
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ISTRIPX(NSTRPX)=(J/2)+(LADD-1)*1024 |
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QSTRIPX(NSTRPX)=floatadcx |
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XSTRIPX(NSTRPX)=GLOBSTRIPX(NP,NT,J) |
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endif |
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enddo |
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******************** Y side ************************* |
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c=cistry/cdec |
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do j=1,nstripy |
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jmen1=j-1 |
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jm1=1 |
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if(jmen1.lt.1) then |
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jm1=0 |
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jmen1=1 |
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endif |
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jmen2=j-2 |
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jm2=1 |
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if(jmen2.lt.1) then |
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jm2=0 |
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jmen2=1 |
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endif |
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jpiu1=j+1 |
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jp1=1 |
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if(jpiu1.gt.nstripy) then |
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jp1=0 |
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jpiu1=nstripy |
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endif |
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jpiu2=j+2 |
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jp2=1 |
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if(jpiu2.gt.nstripy) then |
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jp2=0 |
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jpiu2=nstripy |
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endif |
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stripqytanti(j)=proytanti(np,nt,j)*(1.-2.*c)+ |
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+ c*(1.-2.*c)*(jm1*proytanti(np,nt,jmen1)+jp1* |
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+ proytanti(np,nt,jpiu1))+ |
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+ (c**2)*(jm2*proytanti(np,nt,jmen2)+2.*proytanti(np,nt,j)+ |
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+ jp2*proytanti(np,nt,jpiu2)) |
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if(stripqytanti(j).gt.1.e-8) then |
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NSTRPY=NSTRPY+1 |
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IF(NSTRPY.GT.MAXSTR) THEN |
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WRITE(6,*) 'ERROR - NSTRPY > MAXSTR' |
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NSTRPY=MAXSTR |
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ENDIF |
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floatadcy=stripqytanti(j)*ycalib |
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NPSTRIPY(NSTRPY)=NP |
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NTSTRIPY(NSTRPY)=NT |
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ISTRIPY(NSTRPY)=J+(LADD-1)*1024 |
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QSTRIPY(NSTRPY)=FLOATADCY |
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YSTRIPY(NSTRPY)=GLOBSTRIPY(NP,NT,J) |
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endif |
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enddo |
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END |
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