Rotations About the Vertical Axis

label:YROT,TYPE=string,APERTURE=real-vector,ANGLE=real;

The element YROT rotates reference system about the vertical ($y$) axis. YROT has no effect on the beam, but it causes the beam to be referred to the new coordinate system

$$\begin{array}{lcl} x_2&=&x_1\cos\theta-s_1\sin\theta, \\ y_2&=&x_1\sin\theta+s_1\cos\theta, \end{array}$$

It has one real attribute:

ANGLE

The rotation angle theta (default: 0 rad). It must be a small angle, i.e. an angle comparable to the transverse angles of the orbit.

A positive angle means that the new reference system is rotated clockwise about the local $y$-axis with respect to the old system.

Example:

KINK:YROT,ANGLE=0.0001;