Observation of the stimulated coherent diffraction radiation in an open resonator at LUCX facility

• DOI: 10.1016/j.nima.2014.06.056
• Publication Date: 2014-06-28T02:02:36Z
• Authors: A. Aryshev; S. Araki; M. Fukuda; P. Karataev; A. Konkov; G. Naumenko; A. Potylitsyn; K. Sakaue; L. Sukhikh; N. Terunuma; D. Verigin; J. Urakawa
• Keywords: Accelerator Physics (physics.acc-ph); High Energy Physics - Experiment (hep-ex); 0103 physical sciences; FOS: Physical sciences; Physics - Accelerator Physics; 01 natural sciences; High Energy Physics - Experiment

We present an initial test of a new type of a pre-bunched beam pumped free electron maser based on Stimulated Coherent Diffraction Radiation (SCDR) generated in an open resonator. An ultra-fast Schottky Barrier Diode (time response $<1\,$ns) has enabled to investigate the properties of the radiation stored in the cavity as well as the intrinsic properties of the cavity itself. We observed a turn-by-turn SCDR generated by a multibunch beam. When the cavity length was exactly a half of the bunch spacing a clear resonance was observed. Moreover, turn-by-turn measurements revealed the cavity quality factor of $72.88$, which was rather high for an open resonator in the wavelength range of $3-5\,$mm. An exponential growth of the photon intensity as a function of the number of bunches was also demonstrated.