A novel concept of controlled halo removal for intense high-energy beams in storage rings and colliders is presented. It is based on the interaction of the circulating beam with a 5-keV, magnetically confined, pulsed hollow electron beam in a 2-m-long section of the ring. The electrons enclose the circulating beam, kicking halo particles transversely and leaving the beam core unperturbed. By ac...

Selected high resolution spectrograms of solar fast-drift bursts in the 6.2{8.4 GHz range are presented. The bursts have similar characteristics as metric and decimetric type III bursts: rise and decay in a few thermal collision times, total bandwidth > 3% of the center frequency, low polarization , drift rate of the order of the center frequency per second, and are association. They appear in ...

We report the peculiar interaction of two type III bursts observed in the solar wind. As electron beams propagating on the same magnetic field lines cross, a spectacular depletion of the type III radio emission is observed. We combine observations from the WAVES experiment on board the STEREO mission together with kinetic plasma simulations to study the extinction of type III radio emission res...

Coherent terahertz radiation from multiple electron beams excitation within a plasmonic crystal-like structure (a three-dimensional holes array) which is composed of multiple stacked layers with 3 × 3 subwavelength holes array has been proposed in this paper. It has been found that in the structure the electromagnetic fields in each hole can be coupled with one another to construct a composite ...

Title of Dissertation: CONTROL AND TRANSPORT OF INTENSE ELECTRON BEAMS Hui Li, Doctor of Philosophy, 2004 Dissertation Directed By: Professor, Patrick G. O’Shea Department of Electrical and Computer Engineering The transport of intense beams for advanced accelerator applications with high-intensity beams such as heavy-ion inertial fusion, spallation neutron sources, and intense light sources re...

The mechanism of conversion from the kinetic energy of electron beams to electromagnetic wave energy is investigated in the two-stream amplifier. It is shown that the optimal efficiency of the amplifier scales according to AV/V for relativistic electron beams and (AV/V) 2 for nonrelativistic electron beams, where AV is the axial velocity difference in the two beams and V is the mean axial beam ...

Articles you may be interested in Generation of electron beams from a laser wakefield acceleration in pure neon gas High-quality electron beam from laser wake-field acceleration in laser produced plasma plumes Appl. In this paper, we present results on a scalable high-energy electron source based on laser wakefield acceleration. The electron accelerator using 30–80 TW, 30 fs laser pulses, opera...

Percentage depth doses (PDDs) and transverse dose profiles (TDPs) were calculated by a Monte Carlo simulation of electron beams of different energies (3, 5, 7 and 9 MeV) produced by a NOVAC7® accelerator. The NOVAC7® is a linear accelerator designed for Intraoperative Radiation Therapy (IORT). The PDDs and TDPs were also experimentally determined. Both calculations and measurements were done on...

We study electron-positron in-flight annihilation as a potential source of quasi-monoenergetic photon (or gamma-ray) beams. A high-intensity tunable-energy (1.515 MeV) gamma source has many potential uses in medical, industrial and security applications. Several electron-positron collision geometries are considered: a) head-on; b) collinear; and c) positron beam incident on a fixed electron tar...

The need to produce intense X-rays in the Energy Recovery Linear Accelerator requires shorter and narrower electron beams than the Cornell Electron Storage Ring can provide. Such electron beams will demand highly accurate beam position monitors (BPMs) to enable operators to control the beam. To prepare for new BPMs, a test stand has been built to conduct experiments on new algorithms and design...