Fourier Filtering of Synchrotron White-Beam Topographs

A kHz heat-load shutter for white-beam experiments at synchrotron sources.

A heat-load shutter capable of frequencies from one to several tens of kHz and window times from 10 micros up to 1 ms is described. In the current configuration the water-cooled shutter absorbs approximately 99% of the heat generated by the white beam. It has been successfully used for extended periods synchronized with a Jülich pulse-selector operating at 946 Hz. The temperature of the pulse-s...

Optimal filtering versus regularization methods in the Fourier precompensation based proximity neurocorrection in Electron Beam Lithography

In this paper proximity effects correction in Electron Beam Lithography by means of an artificial neural network is presented. Supporting approximations to cope with negative doses inherent in Gibbs oscillations which occur from step-like function representation in the Fourier space are introduced. Miller regularization theory as better alternative to Tikhonov one is presented. Optimal filterin...

X-Ray N-Beam Takagi-Taupin Dynamical Theory and N-Beam Pinhole Topographs Experimentally Obtained and Computer-Simulated

Cyclotron versus Synchrotron for Proton Beam Therapy

Two categories in the beam delivery system of proton therapy, scattering and scanning, are closely related to the temporal beam structure, in turn, type of accelerators. Since the synchrotron is well matured technically, efficient and dependable routine operation will be achieved if it is combined with a scatterer system. \Vhen more sophisticated scanning system is sought for better dose distri...

Beam Loading Effects in Jhf Synchrotron

Beam loading effects on the rf system of JHF proton synchrotrons have been investigated by both computer simulation and experiment using a low energy electron beam. From the simulation results, it is found that even under the heavy beam loading the beam acceleration becomes stable if applying the beam loading compensation, and the compensation experiment is succeeded on proto-type Magnetic Allo...