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Design of an Acceleration Gap for Brightness Enhancement in a Reactor-Based Slow Positron Beamline

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Kuzuya Y., Oshima N., Kinomura A., Yabuuchi A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 5
1620-1623
EN
Design of an acceleration gap using mesh electrodes of the brightness enhancement system for the slow positron beamline of Kyoto University research reactor was studied to improve the performance of brightness enhancement. The transmittance and the increase in the angular divergence of the beam resulting from acceleration with the mesh electrode were estimated by trajectory simulations. The effect of the increase in the beam emittance on the beam radius at the focus point was estimated based on the analytical solution of the beam envelope equation. Using the obtained beam transmittance and beam radius, the beam brightness after remoderation was evaluated. Then, the influence of the mesh electrode configuration on the brightness was investigated.
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