摘要:

A series of plasma wakefield acceleration (PWFA) experiments are being conducted with a 30 GeV drive beam from the Stanford Linear Accelerator Center (SLAC). These experiments continue to address the application of meter‐scale plasmas to focus and accelerate electrons and positrons in the context of future applications to high‐energy accelerators. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524853

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Simulation, using particle‐in‐cell (PIC) methods, has played a critical role in the evolution of the field of plasma‐based acceleration. Early on, simulations allowed the testing of new ideas using so‐called cartoon parameters. These simulations were done in either one or two‐dimensions using single processor supercomputers. Through the development of new algorithms and parallel computing, today, we can now use PIC simulations to model the full‐scale of ongoing experiments in three‐dimensions. These experiments are attempting to accelerate electrons to ∼1 GeV. In this article, I will present recent results in which simulation results are compared to experiment and I will discuss the future challenges in advanced accelerator modeling. Principally, these are 1.) to be able to model a 100+ on 100+ GeV collider in three‐dimensions and, 2.) to develop more efficient, yet still accurate, algorithms so that simulation can be used for real‐time feedback with experiment. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524854

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

The motivation for development of high‐power mm‐wave sources and test facilities is reviewed, with emphasis on the need to carry out rf breakdown and surface fatigue tests on accelerating structures in parameter ranges that go beyond those available using cm‐wave facilities. Developments of mm‐wave gyroklystrons and magnicons are summarized, as these are the most mature of any candidate mm‐wave amplifier now under study. Emerging design and development activities for mm‐wave high‐power components and rf pulse compressors are also summarized. Detailed discussions of many of these topics are in papers found elsewhere in this volume. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524855

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Physical and technical issues governing structure‐based and vacuum acceleration of charged particles are reviewed, with emphasis on practical aspects. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524856

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

To achieve multi‐GeV electron energies in the laser wakefield accelerator (LWFA) it is necessary to propagate an intense laser pulse long distances in a plasma channels while maintaining a proper phase with the accelerated electrons. Using capillary discharge we have demonstrated a method that allows controlling the laser group velocity in long, multistage plasma channels. The control is achieved by modifying the index of refraction through variation of plasma density using a segmented capillary discharge. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524857

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

In this article we present electron acceleration by the interaction of a multi‐TW, high repetition rate, table top laser at moderate intensity with an underdense plasma. We optimized this unique electron source in terms of the energy as well as the quality of the generated electron beam. The plasma period was chosen to be of the order of the laser pulse duration by adapting the plasma electron density. The waist of the laser focal spot was chosen to be larger than typical for comparable experiments. As a result, a very energetic, well‐collimated, and bright electron beam was generated, which has the highest energy ever produced by laser‐plasma interactions. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524858

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Wakefield acceleration in dielectric loaded structures is discussed in this paper. We present a description of the dielectric wakefield accelerator concept, comparing some features of the collinear and the two beam accelerator configurations. The Argonne Wakefield Accelerator Facility (AWA) is discussed in detail, including major upgrades that are presently taking place. The basic features and capabilities of the facility are presented, and the dielectric wakefield acceleration results are briefly summarized. Possible variants of the two beam accelerator configuration are discussed, and work on planar dielectric structures in various institutions is presented. We conclude this report mentioning prospective achievements of dielectric wakefield accelerating structures. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524859

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We discuss the recent experiments in the field of Plasma Wakefield Acceleration (PWFA), with emphasis on the FNAL experiment. After completion of this work, the next round of experiments will need to push the envelope on accelerating gradient, interaction length, stability, and accelerated charge. We present theoretical results dealing with plasma accelerator performance in the limit of high driver charge, and short wavelengths. We comment on the impact of such results on both the afterburner (single module) and staged (multiple modules) approaches to plasma‐based accelerators. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524860

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Our understanding of the generation of coherent synchrotron radiation in magnetic bending systems and its impact on beam dynamics has grown considerably over the past few years. The search for understanding has brought a number of surprises, all related to the complexity of the fully self‐consistent problem. Herein I survey the associated phenomenology, theory, and experiments while emphasizing important subtleties that have recently been uncovered. I conclude by speculating on courses of future investigations that may prove fruitful. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524861

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We describe recent advances in diagnostics of the transverse phase space of charged particle beams. The emphasis of this paper is on the utilization of beam‐based optical radiation for the precise measurement of the spatial distribution, divergence and emittance of relativistic charged particle beams. The properties and uses of incoherent as well as coherent optical transition, diffraction and synchrotron radiation for beam diagnosis are discussed. © 2002 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1524862

出版商:AIP    

年代:1902

数据来源: AIP