The accelerator safety interlock system (ASIS) for the X-ray free electron laser (XFEL) at SPring-8 protects personnel from radiation hazards. We developed an ASIS consisting of three interlock systems: a central interlock system (CIS), an emergency interlock system (EIS), and a beam route interlock system (BIS). The CIS and EIS monitor the safety equipment status and emergency stop buttons, re...

The Argonne Wake®eld Accelerator (AWA) is a new facility for advanced accelerator research. A major component of the AWA is its drive linac, consisting of a unique high current short pulse L-Band photocathode based gun and special standing wave preaccelerator designed to produce 100 nC, 30 ps electron bunches at 20 MeV. Commissioning on the drive linac is now underway. We report on our initial ...

This report describes some of the highlights of the present state of construction of the Stanford 20 GeV Linear Accelerator. Comprehensive descriptions, statistics and specifications of the two-mile line1ar electron accelerator have been given on numerous other occasions and will not be included here. By the nature of progress in our construction schedule, hopefully a substantial fraction of th...

During the past few years, a demonstration that a free electron laser driven by an induction accelerator can furnish an intense bunched beam for use in a two-beam accelerator has been performed at CESTA. Earlier work, which concentrated on observing bunching by optical means, and the more recent production of R-F power obtained by passing the bunched beam through a standing-wave output cavity w...

Acceleration of electrons by an electron plasma wave has been of great current interest because of its much larger acceleration gradient than that of conventional rf linacs [1]. Several methods have been proposed for driving a largeamplitude fast-phase-velocity plasma wave [1]. In the Laser Wake-Field Accelerator (LWFA), an electron plasma wave is driven resonantly by a short laser pulse throug...

An overview is presented of radiation protection at high energy electron accelerator facilities. By 'high energy' is meant the energy domain beyond a few tens of MeV, where electromagnetic showers are the determining and dominant factor for beam interactions with matter. The basic components of electron accelerators are described and their potential impact on radiation safety. The paper then co...

The design and performance of a soft X-ray free-electron laser (FEL) beamline of the SPring-8 Compact free-electron LAser (SACLA) are described. The SPring-8 Compact SASE Source test accelerator, a prototype machine of SACLA, was relocated to the SACLA undulator hall for dedicated use for the soft X-ray FEL beamline. Since the accelerator is operated independently of the SACLA main linac that d...

The rotational total skin electron irradiation (RTSEI) technique at our institution has undergone several developments over the past few years. Replacement of the formerly used linear accelerator has prompted many modifications to the previous technique. With the current technique, the patient is treated with a single large field while standing on a rotating platform, at a source-to-surface dis...

We use a wire mesh mask placed in a dispersive region of the Accelerator Test Facility (ATF) at Brookhaven National Laboratory to produce a train of equidistant drive microbunches followed by witness bunch. This type of electron microbunch structure is appropriate for plasma wakefield accelerator experiments. These experiments aim at demonstrating the enhancement of the accelerating field when ...

We propose a dielectric-based, multistaged, laser-driven electron linear accelerator structure operating in a vacuum that is capable of accelerating electrons to 1 TeV in 1 km. Our study shows that a GeV/m gradient is achievable using two 100 fs focused crossed-laser beams, repeated every 300 mm, operated at a peak power of 0.2 GW and an energy density of less than 2 J/cm on the accelerator str...