We present an empirical analytic approximation for the luminosity \de-enhancement" factor HD in e e collisions, as a function of the disruption parameters Dx, Dy, the hour-glass parameters Ax, Ay, and the beam aspect ratio R x= y. We treat Gaussian beams with essentially arbitrary aspect ratio, assuming only that the vertical beam size is less than or equal to the horizontal beam size and that ...

Introduction BNCT is an effective method to destroy brain tumoral cells while sparing the healthy tissues. The recommended flux for epithermal neutrons is 109 n/cm2s, which has the most effectiveness on deep-seated tumors. In this paper, it is indicated that using D-T neutron source and optimizing of Beam Shaping Assembly (BSA) leads to treating brain tumors in a reasonable time where all IAEA ...

We report the possibility of completely destructive interference of three indistinguishable photons on a three port device providing a generalisation of the well known Hong-Ou-Mandel interference of two indistinguishable photons on a two port device. Our analysis is based on the underlying mathematical framework of SU(3) transformations rather than SU(2) transformations. We show the completely ...

A study of the electron beam dynamics in the linac is conducted for the FERMI free electron laser (FEL) founded for construction at the Sincrotrone Trieste [1]. LAYOUT AND DESIGN PARAMETERS The FERMI accelerator layout is schematically shown in Figure 1. It consists of an injector, four linacs, two bunch compressors, a laser heater, and a spreader used to direct the electron beam into one of tw...

The electron Linacs found wide industrial and medical applications. Industrial Linacs include systems for scanning and output electron beam to air with foil window. The critical analysis of electron Linacs for the treatment of materials (degradation of PTFE, curing of composites and others) and food safety is considered in this report. The kind of radiation technologies on the basis of electron...

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...

The importance of the beam and its engineering applications is obvious, and it undergoes different kinds of loading. Such loading may cause cracks in the beam. Crack depth and location are the main parameters for the vibration analysis of such beams. These cracks and their locations effect on the shapes and values of the beam frequency. So it becomes very important to monitor the changes in the...

A numerical method for analyzing a folded or ring cavity is presented. Astigmatic compensated parameters, stability regions, and beam parameters inside the cavity or within the gain medium can be obtained numerically as long as the intracavity beam propagation can be expressed by round-trip matrices, no matter how complicated the cavity is. This method is easy to follow, and the results are acc...