When a particle of low momentum crosses a drift chamber cell:

• The trajectory of the particle is studied in the plane XY Z=Zentrance point, See next picture;
• The position of the wires defining the cell in the same plane 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 throught the field wires 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 using the standard algorithms implemented in DchSimGeom for high momentum particles;

• For each crossing one hit is stored; in next 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  and only one hit is generated.

1. 1. 1. 1. 1. 1. 5x10^-5 - 1x10^-4
               2. 1x10^-4 - 1x10^-3
               3. 1x10^-3 - 5x10^-3
               4. 5x10^-3 - 1x10^-1