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TY - UNPB AU - Hwang, J.G. AU - Kuszynski, J. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - Investigation and Mitigation of the Mie-Scattering on the Surface of the First Objective Lens for Coronagraph-Based Halo Monitor J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - Since, due to the heat capacity of the cryogenics, additional heat load on a cryogenic system as a result of uncontrolled beam losses is only allowed to be below 50 W which corresponds to 10⁻⁵ respected to the full power of BERLinPro, the development of diagnostics which can measure the intensity in the order of 10⁻⁵ is crucial. In our previous beam test of the coronagraph-based halo monitor with various operation modes of the BESSY II storage ring, the limitation of the measurement of the halo distribution was to be 10⁻⁴ respected to the core intensity due to the noise produced by scattered light from digs and scratches of the first objective lens. In order to mitigate the noise level produced from the surface of the objective lens to reach 10⁻⁵ to 10⁻⁶, the Mie-scattering effect was investigated, and furthermore, a high-quality surface lens was purchased. PB - JACoW Publishing CP - Geneva, Switzerland ER -