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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

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.

Monte Carlo Calculations for Photon Attenuation Studies on Different Solid Phantom Materials

100%

Gundogdu O., Tarim U., Gurler O.

Acta Physica Polonica A

2017

vol. 132

issue 3

1032-1035

The linear attenuation coefficients of water and some solid phantom materials, namely of solid water RMI-457, of plastic water, of RW3 solid water, and of Perspex were determined by Monte Carlo calculations, for gamma-ray photons with energies of 59.5, 80.9, 140.5, 356.5, 661.6, 1173.2, and 1332.5 keV. The calculated values were compared with the experimental results presented by other researchers and with theoretical values obtained using the XCOM database. Good agreement was observed between the calculations, the experimental, and the theoretical values. The results indicate that the process in Monte Carlo code can be followed to determine the equivalency of other materials at several energies. Three shielding factors such as half-value layer, tenth-value layer, and mean free path were calculated at all considered gamma-ray energies.

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2 Acta Physica Polonica A

2 2017

1 Gundogdu O.

1 Gurler O.

1 Kinomura A.

1 Kuzuya Y.

1 Oshima N.

1 Tarim U.

1 Yabuuchi A.

Search results

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

Monte Carlo Calculations for Photon Attenuation Studies on Different Solid Phantom Materials