FORWARD/BACKWARD TRACKING

As an example, the following is a three-layer tracking detector at z=+-160-170 cm, with inner radius 31.7 cm and outer radius 98 cm. It measures both x and y in each layer, with a precision of 300 micron.

TYPE:  FORWARD_TRACKING
      LAYER : FCA
            GEOMETRY:  Z=160.0 , RMIN=31.7, RMAX=98.0
            MEASUREMENT: CODE=2, SIG_X=0.03, SIG_Y=0.03
         LAYER :
               GEOMETRY:  Z=165.0 , RMIN=31.7, RMAX=98.0
               MEASUREMENT: CODE=2, SIG_X=0.03, SIG_Y=0.03
         LAYER :
               GEOMETRY:  Z=170.0 , RMIN=31.7, RMAX=98.0
               MEASUREMENT: CODE=2, SIG_X=0.03, SIG_Y=0.03

or, using the REPEAT construct :

TYPE:  FORWARD_TRACKING
      LAYER : FCA
         REPEAT : TIMES=3, DELTA_Z=5.0
            GEOMETRY:  Z=160.0 , RMIN=31.7, RMAX=98.0
            MEASUREMENT: CODE=2, SIG_X=0.03, SIG_Y=0.03
         ENDREPEAT: