This paper presents a novel RF MEMS (Micro Electromechanical System) fixed-fixed switch for very fast switching. Using the obtained equations, the switching time depends on the stiffness and effective mass of the switch beam so that the switching time will be decreased by higher stiffness (spring constant) and lower effective mass. In new design, the suspension bridge is a three-layer beam so t...

Scanned carbon ion radiotherapy beams provide highly conformal dose distributions for stationary tumors and excellent sparing of nearby normal tissues due to the sharp energy-loss maximum (Bragg peak) near the end of the particle range and minimal lateral Coulomb scattering. For moving targets (e.g., respiratory motion) treatment delivery with scanned ion beams becomes considerably more complex...

In the radiotherapy (RT) of moving targets with scanned ion-beams at GSI we are investigating a new method of fast range adaptation. The method controls an ion-beam depth in a moving target by deflecting the ion-beam on an appropriate thickness of a static wedge shaped energy degrader placed upstream in the ion-optical system. A feasibility study of this method using Monte Carlo simulations are...

An ion-optical based fast adaptation of ion beam range for the treatment of moving targets with beam tracking was investigated. The method employs a deflection of the ion beam on a small single wedge-degrader positioned between two bending magnets for range adaptation [1, 2]. A prototype system was implemented at the therapy beam line at GSI and beam parameters of energy-adapted beams were char...

A moving window technique for the finite element time domain (FETD) method is developed to simulate the propagation of electromagnetic waves induced by the transit of a charged particle beam inside large and long structures. The window moving along with the beam in the computational domain adopts high-order finite-element basis functions through p refinement and/or a high-resolution mesh throug...