negative-ions-beams-and-sources

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Negative Ions Beams And Sources

Author : Elizabeth Surrey
ISBN : UCSD:31822036078996
Genre : Science
File Size : 81. 58 MB
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All papers have been peer-reviewed. The Symposium covers all aspects of negative ion production in plasma sources, their extraction into particle beams and subsequent transport, neutralization and exploitation. It is of interest to researchers in plasma physics, particle accelerators and fusion. It is the only international symposium dedicated to negative ion sources and beams.

Second International Symposium On Negative Ions Beams And Sources

Author : Yasuhiko Takeiri
ISBN : 0735409552
Genre : Science
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The topic of Negative ion, beams and ion sources covers all fields related to fusion, accelerator, industrial applications. This proceedings would be of interest to Industry (Energy and electricity companies), Physics and Engineering Departments at Universities, as secondary audience I would consider many scientists working in many areas who, because they are curious, will be interested in reading this book. NIBS2010 is the only symposium dedicated to all aspects of negative ions in physics and technology from formation to application. NIBS2010 covers negative hydrogen ion production, extraction, acceleration, and transport mainly for fusion and accelerator applications. New approaches of negative heavy ions are introduced for material science and space propulsion.

Fourth International Symposium On Negative Ions Beams And Sources Nibs 2014

Author : Werner Kraus
ISBN : OCLC:907289302
Genre : Anions
File Size : 37. 91 MB
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"Most of the contributions were on accelerator and fusion applications. Both of these topics require that negative ions of Hydrogen or Deuterium are produced. For accelerators, the requirement on the ion source is for a beam of either short pulses or continuous operation plus the beam should be intense with a small diameter and good divergence for matching into the transport system. The development for the fusion aims at sources capable of delivering large current beams of several tens of amperes and dimensions of many hundreds of square centimeters, that are operated in near steady state (hour long pulses). In fusion, as well, the trend to replacing arc sources with RF driven sources which occurred in the past with accelerators has started. In modern negative ion sources the negative ions are, in most cases, produced by conversion of positive ions and neutrals on Caesium covered surfaces. The issues related to operation of an ion source with a Caesium coated converter are still challenges to the development community and several novel ideas on this topic were presented at the symposium."--Preface.

Kongressfolge International Symposium On Negative Ions Beams And Sources

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ISBN : OCLC:1100113968
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Fourth International Symposium On Negative Ions Beams And Sources Nibs 2014

Author : Werner Kraus
ISBN : 0735412979
Genre : Anions
File Size : 40. 41 MB
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Sixth International Symposium On Negative Ions Beams And Sources Nibs 2018

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ISBN : OCLC:1243083563
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Production And Neutralization Of Negative Ions And Beams

Author : Martin P. Stockli
ISBN : UCSD:31822034349241
Genre : Science
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The reported advances with small sources of negative ions, especially negative hydrogen ions, drive the progress of many accelerators and enable new research methods and technologies. Large sources of negative deuterium ions are being developed for the international experimental fusion reactor (ITER) that will require 40 MW of plasma heating. The developments increasingly use computer modeling to understand the underlying physics, improve existing, and develop new technologies.

Fifth International Symposium On Negative Ions Beams And Sources Nibs 2016

Author : Dan Faircloth
ISBN : 0735415498
Genre : Anions
File Size : 49. 64 MB
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Second International Symposium On Negative Ions Beams And Sources Takayama City Japan 16 19 November 2010

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ISBN : OCLC:780493683
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Third International Symposium On Negative Ions Beams And Sources

Author :
ISBN : 1629936790
Genre : Anions
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Production And Neutralization Of Negative Ions And Beams

Author : Joseph D. Sherman
ISBN : 0735402485
Genre : Science
File Size : 31. 77 MB
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This symposium addresses all aspects of H- and D- sources, the formation of negative hydrogen and deuterium beams from these sources, and their beam transport properties. The discussion includes both the latest theoretical and experimental work in these areas. The negative ion sources are multicusp, Penning, magnetron, rf (1-13 MHz), surface converter, microwave/ECR (GHz frequency), and polarized source types. Experimental work also includes beam chopping, space-charge lenses, optimized negative ion extraction systems, and beam diagnostics. The negative ion production mechanisms are volume (pure hydrogen or deuterium discharge) and surface production using cesium or other alkali metal to catalyze negative ion production. Theoretical analyses include plasma chemistry, particle-in-cell modeling, and H-/D- extraction physics simulations. The main applications for H- sources are in high-energy neutral beam injectors for fusion reactors and H- sources for charge exchange injection into synchrotrons or spallation neutron source storage rings.

Handbook Of Ion Sources

Author : Bernhard Wolf
ISBN : 9781351838382
Genre : Technology & Engineering
File Size : 31. 77 MB
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The Handbook of Ion Sources delivers the data needed for daily work with ion sources. It also gives information for the selection of a suitable ion source and ion production method for a specific application. The Handbook concentrates on practical aspects and introduces the principle function of ion sources. The basic plasma parameters are defined and discussed. The working principles of various ion sources are explained, and examples of each type of ion source are presented with their operational data. Tables of ion current for various elements and charge states summarize the performance of different ion sources. The problems related to the production of ions of non-gaseous elements are detailed, and data on useful materials for evaporation and ion source construction are summarized. Additional chapters are dedicated to extraction and beam formation, ion beam diagnosis, ion source electronics, and computer codes for extraction, acceleration, and beam transport. Emittance and brilliance are described and space charge effects and neutralization discussed. Various methods for the measurement of current, profile, emittance, and time structure are presented and compared. Intensity limits for these methods are provided for different ion energies. Typical problems related to the operation of ion source plasmas are discussed and practical examples of circuits are given. The influence of high voltage on ion source electronics and possibilities for circuit protection are covered. The generation of microwaves and various microwave equipment are described and special problems related to microwave operation are summarized. The Handbook of Ion Sources is a valuable reference on the subject, of benefit to practitioners and graduate students interested in accelerators, ion implantation, and ion beam techniques.

Production And Neutralization Of Negative Ions And Beams

Author : Alessi
ISBN : 1563961032
Genre : Science
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Production And Neutralization Of Negative Ions And Beams

Author : Joseph D. Sherman
ISBN : STANFORD:36105114165454
Genre : Science
File Size : 61. 94 MB
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This symposium addresses all aspects of H- and D- sources, the formation of negative hydrogen and deuterium beams from these sources, and their beam transport properties. The discussion includes both the latest theoretical and experimental work in these areas. The negative ion sources are multicusp, Penning, magnetron, rf (1-13 MHz), surface converter, microwave/ECR (GHz frequency), and polarized source types. Experimental work also includes beam chopping, space-charge lenses, optimized negative ion extraction systems, and beam diagnostics. The negative ion production mechanisms are volume (pure hydrogen or deuterium discharge) and surface production using cesium or other alkali metal to catalyze negative ion production. Theoretical analyses include plasma chemistry, particle-in-cell modeling, and H-/D- extraction physics simulations. The main applications for H- sources are in high-energy neutral beam injectors for fusion reactors and H- sources for charge exchange injection into synchrotrons or spallation neutron source storage rings.

Formation Of Hydrogen Negative Ions By Surface And Volume Processes With Application To Negative Ion Sources

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ISBN : OCLC:727295090
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During the last few decades interest in negative-hydrogen ion sources has been directed mainly toward synchrotron and other particle accelerator applications, with emphasis on high current densities delivered for short pulses. But within the last several years there has been an awareness in the magnetic fusion program of the future need for negative ions as a means for generating high energy neutral beams, beams with energies above a few hundred keV. Negative ions seem to be the only effective intermediary for efficiently producing such beams. Although methods for generating negative ion beams have relied upon synchrotron concepts, the requirements for fusion are very different: here one is interested in more moderate current densities, up to 100 m A cm−2, but with continuous operation. Proposed source modules would accelerate of the order of 10 A of beam current and deliver several megawatts of beam power. Both H− and D− beams are being considered for application in different reactor systems. The conceptualization of negative ion sources is now in a very volatile stage. But of the great variety of proposals that have been offered to date, three general areas appear ready for development. These are: first, the double charge exchange method for converting a positive ion beam into a negative ion beam; second, electron-volume processes wherein low energy electrons interacting with molecular species lead to negative ion products via dissociative attachment or recombination; and third, generation of negative ions in surface interactions, principally via desorption and backscattering. Both our qualitative and our quantitative understanding of these processes diminishes as one proceeds from the first through the third. The physics of these three methods is considered in detail.

Selection And Design Of Ion Sources For Use At The Holifield Radioactive Ion Beam Facility

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ISBN : OCLC:68378106
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The Holifield Radioactive Ion beam Facility now under construction at the Oak Ridge National Laboratory will use the 25-MV tandem accelerator for the acceleration of radioactive ion beams to energies appropriate for research in nuclear physics; negative ion beams are, therefore, required for injection into the tandem accelerator. Because charge exchange is an efficient means for converting initially positive ion beams to negative ion beams, both positive and negative ion sources are viable options for use at the facility. The choice of the type of ion source will depend on the overall efficiency for generating the radioactive species of interest. Although direct-extraction negative ion sources are clearly desirable, the ion formation efficiencies are often too low for practical consideration; for this situation, positive ion sources, in combination with charge exchange, are the logical choice. The high-temperature version of the CERN-ISOLDE positive ion source has been selected and a modified version of the source designed and fabricated for initial use at the facility because of its low emittance, relatively high ionization efficiencies and species versatility, and because it has been engineered for remote installation, removal and servicing as required for safe handling in a high-radiation-level ISOL facility. The source will be primarily used to generate ion beams from elements with intermediate to low electron affinities. Prototype plasma-sputter negative ion sources and negative surface-ionization sources are under design consideration for generating radioactive ion beams from high-electron-affinity elements. The design features of these sources and expected efficiencies and beam qualities (emittances) will be described in this report.

Positive And Negative Ion Beam Merging System For Neutral Beam Production

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ISBN : OCLC:958230301
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The positive and negative ion beam merging system extracts positive and negative ions of the same species and of the same energy from two separate ion sources. The positive and negative ions from both sources pass through a bending magnetic field region between the pole faces of an electromagnet. Since the positive and negative ions come from mirror image positions on opposite sides of a beam axis, and the positive and negative ions are identical, the trajectories will be symmetrical and the positive and negative ion beams will merge into a single neutral beam as they leave the pole face of the electromagnet. The ion sources are preferably multicusp plasma ion sources. The ion sources may include a multi-aperture extraction system for increasing ion current from the sources.

Negative Ions As A Source Of Low Energy Neutral Beams

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ISBN : OCLC:727318305
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Little consideration has been given to the impact of recent developments in negative ion source technology on the design of low energy neutral beam injectors. However, negative ion sources of improved operating efficiency, higher gas efficiency, and smaller beam divergence will lead to neutral deuterium injectors, operating at less than 100 keV, with better operating efficiencies and more compact layouts than can be obtained from positive ion systems.

Ion Sources For Initial Use At The Holifield Radioactive Ion Beam Facility

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ISBN : OCLC:873859333
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The Holifield Radioactive Ion Beam Facility (HRIBF) now under construction at the Oak Ridge National Laboratory will use the 25-MV tandem accelerator for the acceleration of radioactive ion beams to energies appropriate for research in nuclear physics; negative ion beams are, therefore, required for injection into the tandem accelerator. Because charge exchange is an efficient means for converting initially positive ion beams to negative ion beams, both positive and negative ion sources are viable options for use at the facility; the choice of the type of ion source will depend on the overall efficiency for generating the radioactive species of interest. A high-temperature version of the CERN-ISOLDE positive ion source has been selected and a modified version of the source designed and fabricated for initial use at the HRIBF because of its low emittance, relatively high ionization efficiencies and species versatility, and because it has been engineered for remote installation, removal and servicing as required for safe handling in a high-radiation-level ISOL facility. Prototype plasma-sputter negative ion sources and negative surface-ionization sources are also under design consideration for generating negative radioactive ion beams from high-electron-affinity elements. The design features of these sources and expected efficiencies and beam qualities (emittances) will be described in this report.

Production And Neutralization Of Negative Ions And Beams

Author : France) International Symposium on the Production and Neutralization of Negative Ions and Beams (9th : 2002 : Gif-sur-Yvette
ISBN : STANFORD:36105026153192
Genre : Medical
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The symposium included 20 formal presentations on recent accomplishments in research and development for the production and neutralization of negative ions and beams. Topics include progress in technical developments and experiences, diagnostic developments, as well as in improved understanding through modeling and theoretical developments. For the first time, a simple, physics-based theoretical treatment was presented to properly model the ion extraction from negative ion sources. In addition, a method was presented that can accurately estimate the rms emittance from measured distributions. The proceedings contain all 20 presentations, written by 60 authors and co-authors, involving 21 institutions worldwide. All papers were peer reviewed.

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