Figure 13
The constant-Keff operational mode results in nearly constant brilliance values for undulator II, as shown by lines AC for the first and the third harmonics (the period is changed from 1.5 cm to 3.0 cm, see inset). The dashed curves BD were obtained by varying the solenoid field after the period was fixed at 2.5 cm. The total power is linearly proportional to the X-ray energy when it is kept fixed, as shown by thin dashed lines. |