Motion requirements for RaMCaF. The facility has a right-handed Cartesian coordinate system with the chief X-ray axis defined as being the z-axis. Translations occur in X while roll is defined as a rotation around the z-axis, yaw around the y-axis and pitch around the x-axis. An optic will be perfectly aligned when its center of rotation in x, y, and z is in the origin. z values are positive in the direction of the focal plane.