The current code DchSimGeom and the  dbio data base dch.db, include
the possibility to introduce a global misalignment of the Drift Chamber.
In dch.db two templates have been defined,  DchRotm   and DchVol,  with the structures:

• • template DchRotm   ! Rotation matrix parameters
  • •  char name      ! Name
    •  int  irot      ! Number of the rotation matrix
    •  real the1      ! Angle from X axis
    •  real phi1      ! Angle from Y axis
    •  real the2      ! Angle from Z axis
    •  real phi2      ! Angle from Y axis
    •  real the3      ! Angle from Z axis
    •  real phi3      ! Angle from Y axis
  • end DchRotm

• • template DchVol      ! Parameters necessary to define completely the drift Ch
  • •  char name      ! name
    •  char shape      ! shape
    •  char medium    ! medium name previously defined
    •  int  npar           ! # of parameters
    •  real par(4)       ! parameters to define volume
    •  char mother    ! mother volume containing the present volume
    •  int  nin            ! position number in the mother
    •  real xyz(3)      ! X,Y,Z position of the present volume inside the mother
    •  char rotm        ! Rotation Matrix name ( if not exist insert "null")
    •  char only         ! flag to select many or only attribute
  • end DchVol

make DchVol DCHA "DCHA" "TUBE" "DCHA-mot"  3 23.60 80.90   164.8  0.0 "BFAC" 1  0.0 0.0   14.80 "null" "ONLY"

A misalignment may be introduced (like a rotation) defining the rotation matrix ( for example with the name DCHR) and the declaration:
make DchRotm DchR "DchR"  xxx  90.0      22.5      90.0      112.     0.000E+00  .000E+00

or/and  introducing not zero values in xyz(3) for a linear shift in the declaration :

make DchVol DCHA "DCHA" "TUBE" "DCHA-mot"  3 23.60 80.90   164.8  0.0 "BFAC" 1  0.0 0.0   14.80 "DchR" "ONLY"

                                                      Local  Misalignment

A local misalignment for cells or wires requires the introduction of a new template to define
the interested wires.
A possibility may be the use of the same structure used to input the wire parameters with some new information:
 

• • template DchWir ! sense wire characteristics
  • • •  int  layer     ! Layer number
      •  int  cell        ! Cell Number
      •  int  wire      !  Wire identifier (like the Kelsey numbering method)
      •  real rend      ! radius at the rear endplate
      •  real phiE      ! Phi    at the rear endplate
      •  real twist     ! twist angle at endplate
      •  real ster      ! stereo angle
      •  real sag       ! sagitta
      •  real diam     ! wire diameter
  • end DchWir