First Observation of Self-Amplified Spontaneous Emission in a Free-Electron Laser at 109 nm Wavelength

We present the first observation of Self-Amplified Spontaneous Emission (SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109 nm wavelength (11 eV). The observed free-electron laser gain (approx. 3000) and the radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width and intensity fluctuations all corroborate the existing models for SASE FELs.Comment: 6 pages including 6 figures; e-mail: [email protected]

The Bypass Project at DORIS II

DURI5 II is used for high energy physics and for the production of synchrotron radiation. The lack of suitable straight sections for the installation of wigglers or undulators led to the idea of bypassing the one interaction point that is no longer needed. The bypass provides space for 7 additional insertion devices and allows colliding beam operation too. Therefore the bypass can also be used for parasitic synchrotron radiation experiments during high energy physics runs. A description of the bypass is presented