PT Unknown AU Steinmann, JL Brosi, M Bründermann, E Caselle, M Hertle, E Hiller, N Kehrer, B Müller, AS Schönfeldt, P Schuh, M Schütze, P Schwarz, M Hesler, J TI Non-interferometric spectral analysis of synchrotron radiation in the THz regime at ANKA PY 2015 LA english ER