نتایج جستجو برای: electrostatic accelerator
تعداد نتایج: 41588 فیلتر نتایج به سال:
We have developed an integrated software system, TrakRF, to model electromagnetic fields and charged particle orbits in high-power RF devices. Our primary application is simulation of electron multipactoring near RF vacuum windows for the APT (Accelerator Production of Tritium) Program. In this paper we describe features of the codes and initial multipactor calculations for superconducting cavi...
High energy and high power negative ion sources and accelerators have been developed for neutral beam (NB) injectors of future fusion machines such as International Thermonuclear Experimental Reactor (ITER). Using a 5-stage electrostatic accelerator, negative ion beam has been successfully accelerated up to the energy of 1 MeV, which is the required energy for ITER. Powerful negative ion beams ...
An Electron Beam Ion source Charge Breeder (EBISCB) has been developed to charge breed CARIBU radioactive beams at ATLAS and it is now in the final stages of off-line commissioning. Within the next year, the EBIS-CB will replace the existing ECR charge breeder to increase the intensity and improve the purity of reaccelerated radioactive ion beams. The integration of the new EBIS-CB requires: a....
When used at facilities like OMEGA and the NIF, CR-39 is exposed to high vacuum environments before and after irradiation by charged particles and neutrons. Using an electrostatic linear accelerator at MIT, studies have been conducted to investigate the effects of high vacuum exposure on the sensitivity of CR-39 to fusion protons in the ~1-9 MeV energy range. High vacuum conditions, of order 10...
The equilibrium measure of a compact plane set gives the steady state distribution of charges on the conductor. We show that certain moments of this equilibrium measure, when taken about the electrostatic centroid and depending only on the real coordinate, are extremal for an interval centered at the origin. This has consequences for means of zeros of polynomials, and for means of critical poin...
The nanometer scale beam sizes at the interaction point in linear colliders limit the allowable motion of the final focus magnets. We have constructed a prototype system to investigate the use of active vibration damping to control magnet motion. Inertial sensors are used to measure the position of a test mass, and a DSP based system provides feedback using electrostatic pushers. Simulation and...
In the Plasma Beat Wave Accelerator, acceleration is achieved by a longitudinal electrostatic field produced as a result of charge separation generated by a plasma wave traveling close to the speed of light. The plasma wave in turn is produced by two colinear laser pulses whose amplitude is modulated so that the beat frequency matches the plasma frequency. Optical mixing and Raman forward scatt...
Ground based tests were performed at the Max-Planck-Institute für Kernphysik Van de Graaff accelerator in Heidelberg, Germany to explore radiofrequency (RF) emission associated with hypervelocity particle impact induced plasma. Meteoroids and dust traveling between 11 and 72.8 km/s are constantly bombarding spacecraft while on orbit. These hypervelocity particles may cause electrical anomalies ...
In this paper design and simulation of an optimized accelerator tube is presented for the production of light charged particles up to energy of 2 MeV. Geometry of the accelerator tube electrodes was simulated based on the Van De Graaff accelerator tubes of Atomic Energy Organization by SIMION 7.0, Virtual Device and SIMION Toolkit codes. In accelerator tube, the extracted ion beam from the ion ...
Technologies producing high current density (>20mA/cm2) negative ions at a low operating gas pressure (<0.3Pa) has been established. Reduction of the gas pressure is efficient to improve the acceleration efficiency of neutral beam injectors. Beam optics in a multi-aperture, multi-stage electrostatic accelerator has been studied using a 400keV negative ion source. It was found that the ion beam ...
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