Run cards

The run cards file configures the Geant running options:

Definition of the active detectors
Control of the physics processes
User defined target position
Magnetic field

More information about run cards you may find on the GEANT web page: wwwasd.web.cern.ch/wwwasd/geant

There are predefined run cards for physics on and physics off. You can take the proper file from this directory: afs/cern.ch/na49/library/new/GEANT/GNA49/exa. Below there is an example file. The sorce code is here

If you define the target position yourself like it is done in this example (see TXYZ flag), make sure that it matches to the targte position of your running period.

SETS 'VET ' 'VT1 ' 'VT2 ' 'MTL ' 'MTR ' 'TFR ' 'TFL ' 'TFG '
AUTO 0
BMAP 1 //magnetic field map flag
FIEL 15. 11.
DCAY 1
ANNI 0
BREM 0
COMP 0
HADR 0
MUNU 0
PAIR 1
PFIS 0
PHOT 0
RAYL 0
LOSS 1
DRAY 0
MULS 1
CUTE -1. -1. -1. // flag to set tracking thresholds in dense materials very high
NMAG 1
TFLG 1 1 0 // target switches
TXYZ 0. 0. -581.400024 // target position
STOP

DESCRIPTION OF NA49 Geant commands

TFLG

default:
tgt_flag(1) = 0
tgt_flag(2) = 1
tgt_flag(3) = 0
CALL FFKEY( 'TFLG', tgt_flag, 3, 'INTE' )

tgt_flag(1)=0: mean position of primary vertex
0= primary vertex extracted from target position in CAVE namelist (default
1 = primary vertex extracted from card TXYZ (variable tgt_xyz(1),(2),(3))

tgt_flag(2): smear interaction over target thickness?
0=no
1=yes (default)

tgt_flag(3): randomly distribute interaction in target in x and y?
0=no (default)
1=yes, use sigmas from TSIG card

TXYZ

default:
tgt_xyz(1) = 0.
tgt_xyz(2) = 0.
tgt_xyz(3) = -580.
CALL FFKEY('TXYZ', tgt_xyz, 3, 'REAL' )