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Re: feature or bug in TRKSiSD00? [message #1716 is a reply to message #1686] Tue, 07 April 2009 07:45 Go to previous message
musat
Messages: 57
Registered: February 2004
Dear Rita,

All sensitive detectors in the tracking region write
(to the hit that is being saved) the PID stored in

Control::primaryId

This is updated to the current TrackID in :
Mokka/source/Kernel/src/TrackingAction.cc

In TrackingAction::PreUserTrackingAction there is the following
piece of code:

==================================================
if( TruePrimary || ( InsideTrackerRegion &&

aTrack->GetKineticEnergy()>Control::TPCCut) )
{

// reset the PID for Cal hits
Control::GetControl()->ResetPIDForCalHit(aTrack->GetTrackID());
==================================================

If the initial kinetic energy of the track is greater than
Control::TPCCut (default is 10 MeV) then all sub-detectors
located in the tracking region will store in the hits the
PID of the current track.

The TPCCut can be changed by the command line option

Mokka -t <double>

specifies the TPC primary energy cut in MeV.
(enables the user to control the TPC output file length)
(default is 10 MeV)

or with the steering command:

/Mokka/init/TPCCut


The most direct way to go is to set the TPCCut to zero for
example, but in that case, all tracking devices will behave
like the VXD.

And, if I understood correctly from Paulo, all parent particles
are saved, up to the primary, thus giving large lcio files.

The other possibility is to

- replace 'currentPID' by 'currentSecondaryPID'

in TRKSiSD00::DumpHit

Thus correcting the specific problem of the VXD, and leaving the
other tracking detectors unaffected.

What do you think it would be best to do?

Best regards,
Gabriel
 
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