Enhancement and Transformation of the Phase Space Density of the NEPOMUC Positron Beam

13th International Workshop on Slow Positron Beam Techniques and Applications

Piochacz, C.^1,2 ; Erdnüß, E.^2 ; Gigl, T.^1,2 ; Grill, N.^1 ; Hugenschmidt, C.^1,2

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 switches;    High intensity beam;    High-brightness beams;    Mean diameter;    Phase space densities;    Positron beams;    Pulsed beams;    Switching time;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012027/pdf
DOI  :  10.1088/1742-6596/505/1/012027

来源: IOP

【 摘 要 】

At NEPOMUC, four different experiments are installed permanently and one beam port is open for positron experiments provided by external users. To match the different demands of these experiments on the phase space density of the positron beam, the established NEPOMUC remoderator was relocated and two novel beam switches were installed to provide the primary high-intensity beam or the remoderated high-brightness beam within short switching times. At the present state, the remoderated beam has a mean diameter of 1.85(35) mm and an intensity of 3.0(3) · 107e+/s. For the transformation of the longitudinal phase space density a new buncher setup was developed which converts the continuous positron beam into a pulsed beam.