A novel materials-selection procedure has been developed and implemented in software. The procedure makes use of Materials Selection Charts: a new way of displaying material property data; and performance indices: combinations of material properties which govern performance. Optimisation methods are employed for simultaneous selection of both material and shape. INTRODUCTION The performance of ...

A new kind of Cerenkov beam position monitor is described. The counter, though relatively simple and inexpensive, has high sensitivity, introduces a minimal amount of multiple scattering, and is capable of high spatial resolution over a wide range of beam currents 0 Measurements of the position of the SLAC electron beam to an accuracy of I l/2 mm have been made for electron currents from 20 nA ...

We have reflected a Stark-decelerated beam of OH molecules under normal incidence from mirrors consisting of permanent magnets. Two different types of magnetic mirrors have been demonstrated. A long-range flat mirror made from a large disc magnet has been used to spatially focus the reflected beam in the longitudinal direction (”bunching”). A short-range curved mirror composed of an array of sm...

Optical entanglement is a key requirement for many quantum communication protocols. Conventionally entanglement is formed between two distinct beams, with the quantum correlations being measured at separate locations. We show entanglement between the modes within one beam. Our technique is particularly elegant and a major advance towards practical systems with minimum complexity. We demonstrate...

Sinc< I ~H7. the beam of the syndlfo·cyclotron is tunned and adapted Ii" medical treatments. 11,e first eye treatment was realized in 1991 and Irom this date the Centre de Protontherapie d'Orsay (C.I' .O.) accumulates experience for the beam control. Beside the classical discussions on the parameters settings "fthe machine and the beamline. the "wrall problem of accuracy of the beam must also t...

In this paper we investigate the limits on beam intensity in low-energy proton synchrotrons due to the instability of the beam envelope . This instability has been previously examined in the context of space charge dominated ion beams, in particular for inertial confinement fusion applications. We generalize the formalism of beam envelope evolution to include effects found in circular accelerat...

We report polarization tomography experiments on metallic nanohole arrays with square and hexagonal symmetry. As a main result we find that a fully polarized input beam is partly depolarized after transmission through a nanohole array. This loss of polarization coherence is found to be anisotropic; i.e., it depends on the polarization state of the input beam. The depolarization is ascribed to a...

Introduction: Today, radiotherapy combined with surgery in the treatment of parotid tumors widely are used specially for high grade parotid tumors. One of concern and challenge issue of radiotherapy is that the treatment of these tumors with irregular surface due to the presence of external ear and region of different physical electron density (air cavities, dense bone, soft t...

The transition to Advanced LIGO introduces new sensitivity requirements for the LIGO interferometers. When light scatters away from the main laser beam, then scatters off the beam tube and returns to the main beam, noise is introduced into the phase of the laser. The Auxiliary Optics Support subsystem uses baffles and beam dumps to control this scatter, but the baffle material and shape contrib...

To promote the development of timber–steel composite (TSC) structures, this paper proposes a TSC I-beam with an as webs, covered timber board on its upper and lower surfaces bolted together; effect varying ratio thickness to bending performance was investigated. Considering same total height beam cross-section variation height, three groups six specimens were designed fabricated carry out load ...