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Re: Group velocity for Cherenkov photon propagation in G3/G4 [message #11464 is a reply to message #11457]

Wed, 26 January 2011 21:23

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *dip.t-dialin.net

Hi Jochen,

Quote:

Would you have a suggestion how I can access in PndDrc.cxx
the TOF of the particle and subtract it?

if what you need is to the velocity inside the bar, then the easiest way is to register both track length and time when entering the bar. i.e:

if ( gMC->IsTrackEntering() ) {

fTime_in = gMC->TrackTime() * 1.0e09;
fLength_in = gMC->TrackLength();

}

and when exiting (or at certain position or time)

if ( gMC->IsTrackExiting() ) {

fTime_out = gMC->TrackTime() * 1.0e09;
fLength_out = gMC->TrackLength();

}

then you can subtract the time and length, would this solve the problem?

Quote:

And is TrackLength() a "clean" quantity, which contains only
the path inside the bar? Or do I need to make a correction to
get the path that corresponds to the corrected TrackTime()
value I need to use?

The track length is always from the vertex.

Hope this will help.

best regards

Mohammad

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[Message index]

		Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 11:46
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: StefanoSpataro on Wed, 26 January 2011 12:41
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 14:12
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: StefanoSpataro on Wed, 26 January 2011 14:37
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Mohammad Al-Turany on Wed, 26 January 2011 14:53
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 17:41
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Thu, 27 January 2011 11:33
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Oliver Merle on Fri, 28 January 2011 19:04
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Mohammad Al-Turany on Wed, 26 January 2011 21:23
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Fri, 28 January 2011 19:14
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Oliver Merle on Fri, 28 January 2011 19:39
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Fri, 28 January 2011 21:33
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Mon, 11 April 2011 15:25

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