Structure of the CC package

The full description of ALL software packages structure can be found in the description of the CLAS GEANT simulation package GSIM.

The main idea is that the structure of every package, concerned with different detector types ( DC, CC, SC, EC etc) follows the GEANT philosophy :

• There are some initialization subroutines ( CCINIT) to define volumes, materials, media, to read geometry parameters from a file or BOS banks, to define control flow cards, etc..
• The trajectory of each particle , which reached a sensitive volume , is divided into a number of steps and a step routine is called ( CCSTEP). At each call the coordinates at the beginning and at the end of the step, the particle and medium characteristics, etc. are acceptable. This routine is used to define the response from this part of the particle trajectory and to store it (say, in HITS structure).

• After ALL tracks in the event are processed, the DIGI routine is called ( CCDIGI), which calculates the CC response for the total event. It uses the information on both primary and secondary tracks. This response is stored in the DIGI structure, or in a special BOS bank - to reproduce the same format as proposed for ONLINE events.

• Some routines may be called at the end of each event ( e.g. CCOUT )