| Abstract |
In a Self-Amplified Spontaneous Emission (SASE) FEL, the electron beam shot noise is amplified in the interaction of the electron beam in a long undulator. To improve the poor temporal coherence and the broad noisy SASE spectrum, self-seeding schemes can be applied. At the Linac Coherent Light Source (LCLS) for Hard X-rays (HXR) wavelengths, a diamond-based monochromator allows to self-seed the electron beam producing highly temporal coherent x-ray pulses, with a bandwidth 40 times narrower than regular SASE. Two-color self-seeded HXR pulses are available by using both independent rotation angles allowed for the self-seeding diamond crystal. By using a Twin-Bunch electron beam, a photon energy separation up to 1% and a time delay separation up to 125 fs are also achievable. |
