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CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide TRAK130<br />

Origin : R.Brun,F.Bruyant,M.Maire Submitted: 01.10.84<br />

Revision : Revised: 16.12.93<br />

Documentation :<br />

GTVOL block diagram.<br />

Tracking one particle through a volume<br />

Compute distance to next boundary<br />

based on linear extrapolation<br />

CALL GNEXT<br />

SNEXT,SAFETY<br />

IF(ITRTYP =1) CALL GTGAMA<br />

= 2 CALL GTELEC<br />

= 3 CALL GTNEUT<br />

= 4 CALL GTHADR<br />

= 5 CALL GTMUON<br />

= 6 CALL GTNINO<br />

2 = INWVOL = 0<br />

Extrapolate track into new volume by EPSIL<br />

CALL GUSTEP<br />

CALL GMENEW / GINVOL<br />

Is particle still in name volume ? YES<br />

CALL GUSTEP<br />

Figure 51: Example of geometrical tree structure<br />

337 TRAK130 – 1

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