----------------------------------- To obtain a collision tape, the user must input option USERDUMP withWHAT(1)>= 100. The user can choose to dump all data concerning particle trajectories, data concerning continuous energy deposition, data concerning local (point) energy deposition, or any combination of the three. By default, data are written on the collision tape in single precision and unformatted, but it is also possible for the user to modify the MGDRAW subroutine and to obtain a more customised output file (see 13}). The variables written by the default version of MGDRAW}, and their number, differ in the three cases. The sign of the first (integer) variable dumped at an event indicates how to interpret the following ones: - Case 1 (First variable > 0 ): continuous energy deposition - Case 2 (First variable = 0 ): point energy deposition - Case 3 (First variable < 0 ): source particles In Case 1, the following variables are written: First record: NTRACK, MTRACK, JTRACK, ETRACK, WTRACK, (three integers and two real variables) Next record: (XTRACK(I), YTRACK(I), ZTRACK(I), I = 0, NTRACK), (DTRACK(J), J = 1, MTRACK), CTRACK (NTRACK+MTRACK+1 real variables) where: NTRACK = number of trajectory segments MTRACK = number of energy deposition events along the trajectory JTRACK = particle type (see 5}) ETRACK = total energy of the particle (rest + kinetic) WTRACK = particle weight XTRACK(I), YTRACK(I), ZTRACK(I) = coordinates defining the upstream end of the (I+1)th segment; for I = NTRACK, the end of the trajectory DTRACK(J) = energy deposition in the Jth deposition event along the trajectory CTRACK = total curved path In Case 2, the following variables are written: First record: 0, ICODE, JTRACK, ETRACK, WTRACK (three integers and two real variables) Next record: XSCO, YSCO, ZSCO, RULL (4 real variables) where: JTRACK, ETRACK, WTRACK have the meaning explained above, XSCO, YSCO, ZSCO = coordinates of the energy deposition point RULL = amount of energy deposited ICODE = indicates the type of point event giving raise to energy deposition, as explained below: 1x = call from KASKAD (hadronic part of FLUKA); 10: elastic interaction recoil 11: inelastic interaction recoil 12: stopping particle 13: pseudo-neutron deposition 14: escape 2x = call from EMFSCO (electromagnetic part of FLUKA); 20: local energy deposition (i.e. photoelectric) 21: below user-defined cutoff 22: below user cutoff 23: escape 3x = call from KASNEU (low-energy neutron part of FLUKA) 30: target recoil 31: neutron below threshold 32: escape 4x = call from KASHEA (heavy ion part of FLUKA) 40: escape 5x = call from KASOPH (optical photon part of FLUKA) 50: optical photon absorption 51: escape In Case 3, the following variables are written: First record: -NCASE, NPFLKA, NSTMAX, TKESUM, WEIPRI, (three integers and two real variables) Next record: (ILOFLK(I), ETOT(I), WTFLK(I), XFLK(I), YFLK(I), ZFLK(I), TXFLK(I), TYFLK(I), TZFLK(I), I = 1, NPFLKA ) (NPFLKA times (one integer + 8 real variables)) where: NCASE = number of primaries treated so far (including current one) NPFLKA = number of particles in the stack NSTMAX = maximum number of particles in stack so far TKESUM = total kinetic energy of the primaries of a user written SOURCE WEIPRI = total weight of the primaries handled so far ILOFLK(I) = type of the Ith stack particle (see 5}) ETOT(I) = total energy of Ith stack particle XFLK(I), YFLK(I), ZFLK(I) = source coordinates for the Ith stack particle TXFLK(I), TYFLK(I), TZFLK(I) = direction cosines of the Ith stack particle