The experimental program to be carried out with the two-mile-long 20-GeV electron beam produced at the Stanford Linear Accelerator Center (SLAC) and the associated experimental apparatus have been designed to take full advantage of the unique features of this accelerator. These have been described in detail in the previous article and so only the main qualitative features are listed here: 1. Hi...

The presence of energetic runaway electron beams above thunderstorms is suggested by observations of terrestrial gamma ray flashes [Fishman et al., 1994], as well as by theoretical work [Roussel-Dupré and Gurevich, 1996; Lehtinen et al., 1999], although such beams have not been directly measured. In this paper we consider possible measurable effects of such beams in the conjugate hemisphere as ...

We are used to electrons occupying states with quantized spin and orbital angular momenta in atoms, but existing methods for generating high-energy electron beams are very inefficient at either producing or transferring states with well-defined spin and/or orbital angular momentum. This failure stems from the dominance of the direct Coulomb interaction over the spin–spin and spin–orbit interact...

High-power, ultrashort laser pulses have been shown to generate quasi-monoenergetic electron beams from underdense plasmas. Several groups have reported generating high-energy electron beams using either supersonic nozzles or a capillary based system to guide the laser pulse. While, significant progress has been achieved in the last several years, many issues still remain, with respect to point...

A beam-tracking simulation has been done for study of the electron-cooling bunching of ion beams around a few hundred MeV/u. In the simulation, the field due to the space charge of a beam in a round vacuum chamber is calculated from the charge distribution of macro-particles and the image particles due to the macro-particles. The simulation results show that the bunched beams meet a transverse ...

A novel scheme is proposed for generating a polarized positron beam via multiphoton Breit-Wheeler process during the collision of 10 GeV, pC seeding electron with other 1 nC driving beam. The provides strong self-generated field, and suitable transverse deviation distance between two beams enables field experienced by to be unipolar, which crucial realizing polarization. We employ particle simu...

Monte Carlo studies have recently renewed interest in the use of the effect of strong transverse and longitudinal magnetic fields to manipulate the dose characteristics of clinical photon and electron beams. A 3.5 T superconducting solenoidal magnet was used to evaluate the effect of a longitudinal field on both photon and electron beams. This note describes the apparatus and demonstrates some ...

Work supported by Department of Energy contract DE{AC03{76SF00515. The SLC operates with electron beams having a polarization of 80%. The physics opportunities for future colliders will be greatly enhanced if the beam polarization can be signicantly higher. The prospects for achieving electron single-beam polarizations 95% are discussed. A complimentary achievement w ould be to use two-beam pol...

These kickers will be used to make fast dipoles and quadrupoles which are driven by sharp risetime pulsers to provide precision beam manipulation for high current kA electron beams. This technology will be used on the 2 axis of the DARHT linac at LANL. It will be used to provide 4 micropulses of pulse width up to 120 nsec. selected from a 2 μsec., 2kA, 20MeV macropulse. The fast pulsers will ha...