SPECTRAL ANALYSIS OF MICRO-BUNCHING INSTABILITIES USING FAST THz DETECTORS

Abstract

Micro-bunching instabilities occur at synchrotron light sourceswhentheparticledensityrisesduetocompressionof the electron bunches. They lead to powerful bursts of coherent synchrotron radiation (CSR) in the THz range at the cost of very unstable intensity and spectral properties, highlyfluctuating on a millisecond time scale. For interferometry this changing source demands a long averaging time to achieve a reasonably high signal-to-noise ratio or balancing by the use of an additional reference detector. In this study we present measurements taken by a Martin-Puplett-interferometer in the bursting regime with ultra-fast THz-detectors.