2. Desing Proposal
2.1 Coordinate System
We assume the coordinate system as Figure 2.1 through this document. X-axis coincides with the direction of the incident beam propagating. Y-axis represent horizontal axis and Z-axis is vertical one. Each axis (X,Y,Z) is perpendicular to others. θx,θy,θz stand for the rotation around the each axis. Plus direction is defined as clockwise with respect to the each axis.