Positron beam optics for the 2D-ACAR spectrometer at the NEPOMUC beamline

13th International Workshop on Slow Positron Beam Techniques and Applications

Ceeh, H.^1 ; Weber, J.A.^1 ; Hugenschmidt, C.^1,2 ; Leitner, M.^1 ; Boni, P.^1

Technische Universität München, Physik Department, Lehrstuhl E21, James-Franck-Straße, D-85748 Garching, Germany^1

Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Lichtenbergstraße 1, D-85748 Garching, Germany^2

关键词: Beam lines;    Design features;    NEPOMUC;    Positron beams;    Sample environment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012041/pdf
DOI  :  10.1088/1742-6596/505/1/012041

来源: IOP

【 摘 要 】

In the last year a conventional 2D-ACAR spectrometer has been set up and brought to operation at TUM. Once the NEPOMUC beamline is extended to the new experimental hall at the research reactor FRM-II the conventional 2D-ACAR spectrometer will be upgraded with a second sample chamber in order to be integrated to the NEPOMUC beamline facility. This spectrometer will add a complete new quality to 2D-ACAR experiments as it allows to track the evolution of the electronic structure from the surface to the bulk. We present the design features of the positron beam optics and the sample environment.