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Nuclear Science, IEEE Transactions on

Issue 2 • Date April 1976

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Displaying Results 1 - 25 of 68
  • [Front cover]

    Publication Year: 1976 , Page(s): c1
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  • IEEE Transactions on Nuclear Science

    Publication Year: 1976 , Page(s): c2
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  • Table of contents

    Publication Year: 1976 , Page(s): 885
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  • Conference Organization

    Publication Year: 1976 , Page(s): 886
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  • Comments on the Conference

    Publication Year: 1976 , Page(s): 887
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  • The Nucleus

    Publication Year: 1976 , Page(s): 888
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  • Table of contents

    Publication Year: 1976 , Page(s): 889 - 891
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  • Very High Energy Heavy-Ion Accelerators

    Publication Year: 1976 , Page(s): 892 - 896
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  • Review of the JINR Electron Beam Ion Sources

    Publication Year: 1976 , Page(s): 897 - 903
    Cited by:  Papers (8)
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    A review of the electron beam sources of highly-stripped ions, developed at the Joint Institute for Nuclear Research during 1967-75, is given. The effective experimental ionization cross sections of positive C, N. Ar, and Xe ions by electron impact are presented. Possible fields of application of electron beam ion sources are indicated. View full abstract»

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  • Electron Cyclotron Resonance Multiply Charged Ion Sources

    Publication Year: 1976 , Page(s): 904 - 912
    Cited by:  Papers (9)  |  Patents (1)
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    We describe three ion sources working in our laboratory that deliver multiply charged ion beams. All of them are E.C.R. ion sources and are characterized by the fact that the electrons are emitted by the plasma itself and are accelerated to the adequate energy through electron cyclotron resonance (E.C.R.). They can work without interruption during several months in a quasi-continuous regime. (Duty cycle: <.5). Their charge state distributions (C.S.D.) depend on the size and the characteristics of the plasma. For the smallest source the performances are comparable to those of P.I.G. sources. For the biggest source, the C.S.D. tend towards those obtained by EBIS-type sources. Experimental results and guiding ideas concerning these three ion sources are reviewed. View full abstract»

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  • Large Tandem Accelerators

    Publication Year: 1976 , Page(s): 913 - 917
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  • Beam Formation and Space Charge Neutralisation

    Publication Year: 1976 , Page(s): 918 - 928
    Cited by:  Papers (6)
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  • Electron Impact Ionization

    Publication Year: 1976 , Page(s): 929 - 933
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  • Atomic Electron Affinities

    Publication Year: 1976 , Page(s): 934 - 935
    Cited by:  Papers (1)
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  • Electron Affinities - Theoretical

    Publication Year: 1976 , Page(s): 936 - 946
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    A brief description is given of the conceptual background and formalism of the various ab-initio and semi-ab-initio quantum computational techniques for calculating atomic and molecular electron affinities: Hartree-Fock-Roothaan SCF, configuration interaction (CI), multiconfiguration SCF (MC-SCF), Bethe-Goldstone, superposition of configurations (SOC), ab-initio effective core model potentials, X¿-MS, plus other less comnon methods. Illustrative and comparative examples of electron affinities calculated by these various methods are presented. View full abstract»

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  • Charge Exchange Cross Sections

    Publication Year: 1976 , Page(s): 947 - 958
    Cited by:  Papers (2)
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    A review is presented on charge exchange cross sections of heavy ions at energies primarily in the range below 100 keV. Particular emphasis is given to the cross sections for capture of one or more electrons in single encounters of multiply charged ions with atoms. The system of the noble gases as projectile ions and target atoms is studied in detail. Systematic trends are examined. Attention is given to the influence of metastable ions on the cross sections. View full abstract»

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  • Sputtering and Ion-Source Technology

    Publication Year: 1976 , Page(s): 959 - 966
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    Sputtering is dependent on a number of projectile and target parameters. It is shown that the dependence of the sputtering yield on projectile energy, angle of incidence and atomic number is well understood. Also, the dependence on the bulk properties of the target is described reasonably well by theory, while the dependence on the actual surface topography of the target is difficult to quantify. Positive-ion sources mainly depend on the number of atoms sputtered per incoming ion (sputtering yield), while also energy- and angular-distributions of the sputtered material are of primary importance for negative-ion sources. These distributions are reasonably well known and allow a direct calculation of the emittance of some negative-ion sources. View full abstract»

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  • VUV-Spectroscopy of Multiply Charged Ion Source-Plasmas

    Publication Year: 1976 , Page(s): 967 - 970
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    The ion charge state distribution (CSD) in a multiply charged ion source- (MCIS-) plasma can be determined from the spectrum of resonance transitions of excited neutral and ionised plasma particles. The principle of this method, which for noble gas ions involves vacuum-ultraviolet spectroscopy, is described and first measurements for a DUOPLASMATRON-ion source operated with He and Ar are presented. View full abstract»

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  • H- Formation Processes of Interest to Ion Source Development

    Publication Year: 1976 , Page(s): 971 - 974
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    In this short paper, we would like to summarize the results of several cross section calculations on systems that are of interest to ion source development. Since we are so restricted on the size of this paper and because the details of the calculations will be published elsewhere, the descriptions of the theoretical procedures used will be extremely limited. This paper will be divided into three sections; the first is concerned with a series of H + Cs reactions, the second discusses H(2s) + Ar, Kr, Xe cross sections, and the third pertains to some H+ + Mg calculations. View full abstract»

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  • Charge Exchange between Hydrogen Atoms and Fully Stripped Heavy Ions

    Publication Year: 1976 , Page(s): 975 - 978
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    Charge exchange between multicharged ions and background atomic and molecular gases represents one of the limitations to the attainment of high charge states in heavy ion sources, particularly containment sources. This work is an attempt to study systematically a particularly simple but in many respects representative class of such reactions, namely, charge transfer between atomic hydrogen and fully stripped heavy ions. Approximate cross sections for these processes in the low keV range of collision energies were obtained using a multistate Landau-Zener method. The energy and Z dependences of the cross sections are discussed. View full abstract»

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  • The Orsay Electron Beam Ion Source

    Publication Year: 1976 , Page(s): 979 - 986
    Cited by:  Papers (5)
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    Basic parameters of the electron beam ion source (EBIS) are defined. The experimental results of the Orsay EBIS are described. We give also the design of a synchrotron source for production of fully-stripped heavy ion beams and polarized protons. View full abstract»

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  • Heavy Ion Acceleration at Cyclone (Belgium)

    Publication Year: 1976 , Page(s): 987 - 990
    Cited by:  Papers (1)
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    CYCLONE is an isochronous cyclotron in operation in Louvain-la-Neuve (Belgium). It is equipped with a P. I. G. hot cathode heavy ion source and accelerates various ions up to energies of 110 MeV Q2/A with extracted beam intensities reaching 10 ¿A in the 4+ state. The source is described and some performance parameters are given. In order to reach higher charge states an injector cyclotron is projected which will allow a final energy of 27 MeV/nucleon up to neon decreasing to 6 MeV/nucleon for xenon. Extracted intensities vary between 5 × 1013 and 109 pps depending on particle and energy. Some design aspects are described which will allow the cost of the project to be quite low. View full abstract»

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  • Generation and Storage of Multiply-Charged Ions within a RF Quadrupole Trap

    Publication Year: 1976 , Page(s): 991 - 993
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    A three-dimensional rf quadrupole field trap has been designed for generation of multiply-charged ions by successive electron impacts, and for studies of physical processes occurring during charge transfers. Optimum operating conditions have been derived from theoretical considerations, and preliminary experimental results are given. At the end, some limitations and prospects of the quadrupole trap as a tool for physical investigations are briefly discussed. View full abstract»

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  • Use of the Hot-Electron Mirror Machine Interem as a High-Z Ion Source

    Publication Year: 1976 , Page(s): 994 - 998
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    Production of the high-Z charge states in helium, nitrogen, and argon has been measured in the INTEREM device at the Oak Ridge National Laboratory. The INTEREM device contains a hot electron (~500 keV) plasma trapped in a minimum B geometry. The device is of interest because its parameters, electron density and energy, and ion lifetime are consistent with those required for the production of highly charged ions. Ion charge and ion energy spectra were measured independently using an einzel lens type energy analyzer combined with a quadrupole mass filter. For helium, most of the ions were doubly charged under proper operating conditions. For nitrogen, we found the ion yield to be peaked at Q = 4, and under these conditions the yield at Q = 6 was down by a factor of about 20. Energy distribution curves for different charge states show interesting features, from which important information may be inferred about the plasma in INTEREM. Although discrepancies exist in the ion yields we conclude that an INTEREM-like device employing a minimum B geometry and electron cyclotron resonance heating may be expected to be a good high-Z ion source. View full abstract»

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  • An Electron-Cyclotron-Resonance Plasma as a Source of Multiply Charged Ions

    Publication Year: 1976 , Page(s): 999 - 1005
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    The properties of an electron-cyclotron-resonance (ECR) plasma (3 cm microwaves up to 2.4 kW) have been investigated. A total of 80 ¿A noble gas ion current has been extracted from a 1 mm dia. hole so far. The charge state distributions show a maximum above the 1+ state, indicating that multiple impact ionization is a dominant process. X-ray spectra, sheath potential and microwave reflection were measured to gain some physical understanding of the discharge. The applicability of our device as an ion source is discussed. View full abstract»

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IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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