Ionization boundary condition fully tested.

Documentation updated properly.

3D Cartesian geometry also tested.
Documentation updated properly.

Added weighting probability in the injection of particles.

src/modules/mesh/2DCyl/moduleMesh2DCyl.f90

@@ -190,6 +190,7 @@ MODULE moduleMesh2DCyl
       r2 = self%n2%getCoordinates()
       self%z  = (/r1(1), r2(1)/)
       self%r  = (/r1(2), r2(2)/)
+      self%weight = SUM(self%r)*5.D-1
       !Normal vector
       self%normal = (/ -(self%r(2)-self%r(1)), &
                          self%z(2)-self%z(1) , &
@@ -247,14 +248,22 @@ MODULE moduleMesh2DCyl
 
       CLASS(meshEdge2DCyl), INTENT(in):: self
       REAL(8):: rnd
+      REAL(8):: dr, dz
       REAL(8):: r(1:3)
-      REAL(8):: p1(1:2), p2(1:2)
 
       rnd = random()
+      dr  = self%r(2) - self%r(1)
+      dz  = self%z(2) - self%z(1)
+      IF (dr /= 0.D0) THEN
+        r(2) = dr*DSQRT(rnd) + self%r(1)
+        r(1) = dz * (r(2) - self%r(1))/dr + self%z(1)
+
+      ELSE
+        r(2) = self%r(1)
+        r(1) = dz * rnd + self%z(1)
+
+      END IF
 
-      p1 = (/self%z(1), self%r(1) /)
-      p2 = (/self%z(2), self%r(2) /)
-      r(1:2) = (1.D0 - rnd)*p1 + rnd*p2
       r(3)   =  0.D0
 
     END FUNCTION randPosEdge