• Input Geometry (both volumes and wires definition and positioning) via dbio data base dch.db in DchSimGeom.
• 
  Global and local disallignment may be introduced changing parameters in dch.db. In progress new tool to change the data base parameters starting from displacement or rotations.
   
• Elimination of the cut in momentum to track particles in DCH. Low momentum particles (P<5 MeV/c) stopped in the current release. In the new code these particles are studied in the cell. If the particle stops remaining in the same cell one hit is produced and it will be stopped. If the particle reaches the edge of the cell it will be considered like greater momentum particles. The implemented code is in debug and will be released soon.

• The introduction of the sagitta in the sense wire will be next implementation at short term.

•  A new section is now open connected to the real Drift Chamber. The detector is now working taking cosmic rays data. The analysis of the simulated data and the real data requires the tuning and the real validation of the algorithms implemented in the code, both in the geometry and in the digitization parts.

When a particle of low momentum (<5 MeV/c) crosses a drift chamber cell the following algorithm is used:
 
 

• The trajectory of the particle is studied in the plane XY Z=Zentrance point;
• The position of the wires defining the cell are used to make two by two a line like A,B and C in the picture;
• The intersections of the projected trajectory (circus) and each line make 2,1 or 0 solutions;
• If the position of the intersections are outside the cell region (like circus and line B in the picture) another line (A .... then C in the picture) is considered.
• If the intersection is in the cell region (like circus and line C in the picture) the step in the space is used to track the particle with the usual algorithms of DchSimGeom;

• For each crossing one hit is stored; in the picture 4 hits are stored for the same particle in the cell;

• If the trajectory is contained in the same cell (see next picture) the particle is stopped (in the tracking section of GEANT3) and only one hit is generated.