Comparison of Different Approaches to Determine the Bursting Threshold at ANKA

The synchrotron light source ANKA at the Karlsruhe Institute of Technology provides a dedicated low-αc-optics. In this mode bursting of Coherent Synchrotron Radiation (CSR) is observed for bunch charges above a threshold current that depends on beam parameters. This threshold can be determined by several approaches, e.g. bunch lengthening or changes in the THz radiation spectra. This paper compares different methods and their implementation at the ANKA storage ring outlining their advantages, disadvantages and limitations, including reliability and possibility of real time analysis.