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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1569-1570 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The 400-MeV electron storage ring EUTERPE is a University project set up for studies of charged particle beam dynamics and applications of synchrotron radiation, and for the education of students in these fields. The ring has a relatively large circumference for the maximum beam energy contained, which is useful for accommodating insertion devices and diagnostic tools. The critical wavelength of the emitted photon spectrum is 8.3 nm for the regular dipole magnets and 1.2 nm corresponding to 1.03 keV for a 10-T wiggler. This provides useful radiation, e.g., for x-ray fluorescence up to 3.2 keV. An undulator with a periodicity distance of 2.5 cm is planned, to generate radiation of 40 nm. The major ring components are being constructed in the University workshop, including a 70-MeV injector microtron. The main characteristics of the machine and the present status are reported. Future options include a bypass system for microdevices.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 639-640 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The nonlaminar flow characteristics of Cs+ have been studied in an intense Cs+ gun. In the physical model established here, the effects of space charge and thermal initial velocity are taken into account, and a Maxwellian distribution of the thermal initial velocity and its cosine angular distribution of current density with respect to the normal line of the ion-emitting surface are assumed. Poisson's equations are solved in terms of iteration to find a self-consistent solution, and the nonlaminar trajectories are traced; hence the phase diagram at the exit of the gun is obtained. The calculated results are compared with experimental data, and they are in good agreement.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The mechanism of forming negative ions in cesium sputter negative ion sources is studied by means of a modified dipole layer model and quantum theory. Formulas of the change of work function on the metal surface adsorbing cesium layer and the electron transfer probability are given. The formation probabilities of the negative ions are derived using a quantum tunneling model. The negative ion yield is also calculated. The calculated results are in essential agreement with the experimental data. The philosophy described in this paper may offer a useful theoretical model for the mechanism study of cesium sputter negative ion sources.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2640-2642 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The computer simulation of the intense Cs0 source attached to the Wisconsin colliding polarized negative ion source has been performed. The beam phase diagram and phase density distribution function are applied to the study. The principle of the simulation is described. In consideration of the scattering effect of the particles in the neutralization region the characteristics of the phase space is modified and finally the Cs0 beam intensity after passing through the drift region can be obtained by means of beam-transport theory. The calculated results are in good agreement with the experimental data and the main factor limiting the resultant Cs0 beam is found out.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2732-2734 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The thermophysical characteristics of the ionizer in cesium sputter-type negative ion sources is studied by means of the heat transfer theory in this paper. A heat transfer model is given and theoretical calculations are performed. The theoretical calculations are in good agreement with experimental results. Based on the theoretical analysis the configuration of the source is improved and the calorific efficiency is increased, so that the temperature of the ionizer can reach up to 1300 K and the lifetime of the heater core of the ionizer is prolonged. The theoretical model can serve as the basis for the ionizer design of the cesium sputter-type negative ion sources. In addition, the study is also helpful for the design of the heater in the similar ion sources.
    Type of Medium: Electronic Resource
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