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Design Considerations for Plasma Accelerators Driven by Lasers or Particle Beams

Description: Plasma accelerators may be driven by the ponderomotive force of an intense laser or the space-charge force of a charged particle beam. The implications for accelerator design and the different physical mechanisms of laser-driven and beam-driven plasma acceleration are discussed. Driver propagation is examined, as well as the effects of the excited plasma wave phase velocity. The driver coupling to subsequent plasma accelerator stages for high-energy physics applications is addressed.
Date: June 1, 2010
Creator: Schroeder, C. B.; Esarey, E.; Benedetti, C.; Toth, Cs.; Geddes, C. G. R. & Leemans, W.P.
Partner: UNT Libraries Government Documents Department
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Interactive visualization of particle beams for accelerator design

Description: We describe a hybrid data-representation and rendering technique for visualizing large-scale particle data generated from numerical modeling of beam dynamics. The basis of the technique is mixing volume rendering and point rendering according to particle density distribution, visibility, and the user's instruction. A hierarchical representation of the data is created on a parallel computer, allowing real-time partitioning into high-density areas for volume rendering, and low-density areas for p… more
Date: January 15, 2002
Creator: Wilson, Brett; Ma, Kwan-Liu; Qiang, Ji & Ryne, Robert
Partner: UNT Libraries Government Documents Department
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A Linear, Transparent Beam Integrator

Description: Abstract: "A fast, linear air-ionization chamber has been developed for integrating and monitoring external heavy-particle beams. It consists of a thin-windowed air chamber in which the beam ionization light is viewed by a photomultiplier whose output is fed directly to a standard electrometer."
Date: February 12, 1954
Creator: Kitchen, Sumner W.
Partner: UNT Libraries Government Documents Department
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AGS Performance and Plans

Description: The scope of the AGS complex has expanded rapidly during the three years since an accelerated beam was first obtained. Demand for research time far exceeds the amount available although facilities have been much increased. At the same time, experiments are being designed which are more complicated than previous ones and which make more stringent demands on the accelerator and on its auxiliary equipment. There is a continuous trend of experiments to particle beams of greater momentum, as the exp… more
Date: October 15, 1963
Creator: Green, G. K.
Partner: UNT Libraries Government Documents Department
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INSTABILITIES OF RELATIVISTIC PARTICLE BEAMS

Description: The purpose of this paper is twofold: to introduce the reader to the subject of instabilities exhibited by relativistic particle beams, and to summarize the present state of our knowledge concerning these phenomena. Most of the material in the first part of the paper is not new. It has been known to some specialists for a good many years; what is new is that the problems that can be solved are now of much more interest to the general community of accelerator physicists. Consequently, many accel… more
Date: October 4, 1965
Creator: Sessler, Andrew M.
Partner: UNT Libraries Government Documents Department
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BEAM-SURROUNDING INTERACTIONS AND THE STABILITY OF RELATIVISTIC PARTICLE BEAMS

Description: In accord with recent custom, the organizing committee for this conference has scheduled this review paper on beam instabilities. In view of the various review papers which already exist and the fact that the fundamentals of the subject have even been treated in a textbook, I thought this paper might best be devoted to a limited part of the rather large field of beam instabilities. Thus, I have selected only an aspect of the general subject, but an aspect which has during the last years been ve… more
Date: February 1, 1971
Creator: Sessler, Andrew M.
Partner: UNT Libraries Government Documents Department
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Production of Large Energetic Neutral Deuteron Beams

Description: Introduction: A proposal for using an energetic neutral deuteron beam for injection into a mirror machine has been made by Eugene Lauer. This report describes an experimental attempt to produce a large neutral deuteron beam. The beam from the NTA ion source was passed through a target of hydrogen gas where the charge exchange mechanics produced a beam of energetic neutral deuterium atoms.
Date: January 24, 1956
Creator: Hester, R. E.
Partner: UNT Libraries Government Documents Department
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SPILL STRUCTURE IN INTENSE BEAMS.

Description: Fixed target studies of small branching ratio decay processes require intense beams and smooth spills. Longitudinal structure arises through collective effects, well below the coasting beam stability threshold. These structures have been observed at the Brookhaven AGS and dependence on intensity and momentum spread measured. Measurements and amelioration techniques have been developed and will be described.
Date: May 12, 2003
Creator: GLENN,J. W. BLASKIEWICZ,M. BROWN,K. RAKA,E. RYAN,J.
Partner: UNT Libraries Government Documents Department
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A National CW GeV Electron Microtron Laboratory

Description: Rising interest in the nuclear physics community in a CW GeV electron accelerator reflects the growing importance of high-resolution short-range nuclear physics to future advances in the field. To meet this need, Argonne National Laboratory proposes to build a CW GeV Electron Microtron (GEM) laboratory as a national user facility. The microtron accelerator has been chosen as the technology to generate the electron beams required for the research discussed because of the advantages of superior b… more
Date: December 1982
Creator: Argonne National Laboratory
Partner: UNT Libraries Government Documents Department
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GeV C. W. Electron Microtron Design Report

Description: Rising interest in the nuclear physics community in a GeV C.W. electron accelerator reflects the growing importance of high-resolution short-range nuclear physics to future advances in the field. In this report major current problems are reviewed and the details of prospective measurements which could be made with a GeV C.W. electron facility are discussed, together with their impact on an understanding of nuclear forces and the structure of nuclear matter. The microtron accelerator has been ch… more
Date: May 1982
Creator: Jackson, H. E.
Partner: UNT Libraries Government Documents Department
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Coherent parasitic energy loss of the recycler beam

Description: Parasitic energy loss of the particle beam in the Recycler Ring is discussed. The long beam confined between two barrier waves has a spectrum that falls off rapidly with frequency. Discrete summation over the revolution harmonics must be made to obtain the correct energy loss per particle per turn, because only a few lower revolution harmonics of real part of the longitudinal impedance contribute to the parasitic energy loss. The longitudinal impedances of the broadband rf cavities, the broadba… more
Date: July 14, 2004
Creator: Ng, King-Yuen
Partner: UNT Libraries Government Documents Department
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DML and Foil Measurements of ETA Beam Radius

Description: Simultaneous measurements of the ETA beam radius have been made with a quartz foil and a diamagnetic loop (DML). While the measurements agreed at some settings they diverged at others. While the DML measures the rms radius of the total beam, the foil measures mainly the core and the divergence can be explained by the presence of a low density halo. Evidence of such a halo from other measurements is presented.
Date: May 11, 2005
Creator: Nexsen, W & Weir, J
Partner: UNT Libraries Government Documents Department
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Beam Separators for Bev Particles

Description: The problem of separation of beams of particles of different masses but of the same momentum at Bev energies is the subject of a great deal of study at several high energy laboratories. In this note we shall describe the problem and tabulate a few of the cogent parameters. Frequently the student of high energy interactions is faced with a beam of miscellaneous particles coming from an accelerator. By standard techniques this beam can be rendered approximately parallel and an inch or so in diame… more
Date: January 22, 1963
Creator: Blewett, J. P.
Partner: UNT Libraries Government Documents Department
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A PERSPECTIVE FROM THE AGS.

Description: A working model for the proposed JHF project is the AGS facility at BNL. Research that is being planned at the JHF represent extensions of present AGS experiments. The AGS presently holds the record for beam intensity from a synchrotron. Experience gained and lessons learned over the years from operation of the AGS is invaluable to a new facility like JHF. Presented here is a brief description of the AGS facility with emphasis on the separated particle beam lines that are presently being used f… more
Date: March 4, 1998
Creator: PILE,P.H.
Partner: UNT Libraries Government Documents Department
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Entropy and emittance of particle and photon beams

Description: The emittance as the available phase space area is defined as the product of the elementary cell area {delta}{Omega} and exp(S), where S is the normalized entropy of a particle beam. The definition is based on the fact that the factor exp(S) can be interpreted as the number of the occupied cells. For particle beams, a closed expression for the emittance in terms of the phase space distribution function is obtained which is independent of {delta}{Omega}. To compute the emittance of the radiation… more
Date: April 1, 1995
Creator: Kim, K. J. & Littlejohn, R. G.
Partner: UNT Libraries Government Documents Department
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Investigation of Generation, Acceleration, Transport and Final Focusing of High-Intensity Heavy Ion Beams from Sources to Targets

Description: Under the auspices of the research grant, the Intense Beam Theoretical Research Goup at Massachusetts Institute of Technology's Plasma Science and Fusion Center made significant contributions in a number of important areas in the HIF and HEDP research, including: (a) Derivation of rms envelope equations and study of rms envelope dynamics for high-intensity heavy ion beams in a small-aperture AG focusing transport systems; (b) Identification of a new mechanism for chaotic particle motion, halo f… more
Date: October 26, 2006
Creator: Chen, Chiping
Partner: UNT Libraries Government Documents Department
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An Analog Method for Measuring the Longitudinal Coupling Impedance of a Relativistic Particle Beam With Its Environmnet

Description: The stability of a coasting beam against self-bunching (negative mass instability) may be expressed in terms of a beam coupling impedance. The impedance has contributions from self-fields, wall impedance, and curvature effects. This paper describes procedures for measuring the wall and curvature contributions to the coupling impedance by means of an analog in which the beam is replaced by a conductor propagating a TEM-like mode. Conditions are derived under which the measurements are valid, var… more
Date: August 1, 1971
Creator: Faltens, A.; Hartvig, E. C.; Mohl, D. & Sessler, A. M.
Partner: UNT Libraries Government Documents Department
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Transverse Beam Profile Measurement Using Scrape Scans

Description: A scraper scan - sending a scraper through a particle beam while measuring the intensity as a function of scraper position - is a common method of determining the profile of the beam. At first glance, this seems to be a rather simple procedure. Nevertheless, some care is required in the acquisition of the data and in the analysis if one is going to achieve an accurate result.
Date: September 13, 2001
Creator: Werkema, Steven J.
Partner: UNT Libraries Government Documents Department
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