The LHC beam dumping system (LBDS) is used to dispose accelerated protons and ions in a wide energy range from 450 GeV up to 7 TeV. An abort gap of 3 μs is foreseen to avoid sweeping particles through the LHC ring aperture. This paper gives a brief overview of the critical apertures in the extraction region and the two beam dump lines. MAD-X tracking studies have been made to investigate the im...

Fixed-beam, high-gain antenna systems can be used for a finer partitioning of the currently cell-sectoring. This has benefit reducing number users seen per beam, which reduces interference. Furthermore, high gain allows effective isotropic radiated power while keeping transmit low. In this paper, we study performance such fixed-beam, system design millimeter-wave mobile communications. The is d...

Research conducted to-date, makes use of the IBA-Lynx scintillating screen and radiochromic film to analyze proton field uniformity for dose-area product (DAP) determination. In this paper, machine log file based reconstruction is proposed calculate simplify measurement. order uniformity, dose distribution reconstructed on with matRad (an open source software analytical calculation in MATLAB). ...

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind retrievals. The aircraft motion contribution is defined as the scalar product between the radar antenna beam-pointing vector and the aircraft velocity vect...

Parallel-plate electrostatic actuators are a simple way to achieve piston motion for large numbers of mirrors in spatial light modulators. However, selection of design parameters is made difficult by their nonlinear behavior. This paper presents simple models for predicting static and dynamic behaviors of fixed–fixed parallel-plate electrostatic actuators. Static deflection equations are derive...

there are several techniques in use for non-linear refractive index measurement, namely, interferometric techniques, in which conventional inter-ferometers are used, degenerate for wave mixing (dfwm), and z-scan, each of these techniques suffers from some shortcmings. for example conventional interferometers like fabry-perot and twyman-green need high quality optical components, unwanted reflec...

This paper addresses a relatively simple method of measuring Young’s modulus and residual stress in microelectromechanical systems (MEMS) type structures. A surface profilometer is used to measure the deflection of thin film fixed-fixed beams due to the force applied by the profilometer probe. These measurements are analyzed using analytical beam theory. The treatment of end effects and the acc...

The physics case for a possible fixed target polarized nucleon-nucleon collision experiment at HERA is described. The experiment named HERA– ~ N could be realized using an internal polarized gas target in the HERA polarized/unpolarized proton beam. A wide spectrum of nucleon spin structure problems could be investigated and the experiment would constitute a fixed target complement to the RHIC s...

This paper gives an analytical method to obtain the deformation of a cantilever curved beam. The beam considered has circular centre line and thickness cross section in radial direction depends on circumferential coordinate. kinematics Euler-Bernoulli model is used formulate governing equations. homogeneous isotropic elastic fixed at one end other subjected concentrated forces couple. A numeric...

Background: The assessment of RBE quantity in the treatment of cancer tumors with proton beams in treatment planning systems (TPS) is of high significance. Given the significance of the issue and the studies conducted in the literature, this quantity is fixed and is taken as equal to 1.1.Objective: The main objective of this study was to assess RBE quantity of proton beams and their variations ...