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  • 1
    Electronic Resource
    Electronic Resource
    High field strength wedged-pole hybrid undulator (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 339-345 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The wedged-pole concept is introduced as a means for enhancing the field strength and field quality of the rare-earth permanent magnet hybrid undulator. The wedged-pole configuration results in higher on-axis field strength since it causes the magnet surface which faces the gap to be driven to the full magnet coercivity, Hc. Pole tip saturation is avoided by angular wedging of the poles and magnets to provide larger pole tip area without sacrificing magnet volume. The advantages of the wedged-pole concept are investigated for an example case with a gap to wavelength ratio of 0.22 and SmCo5 magnets. It is found that the field strength in the fundamental can be improved by as much as 15%. Alternatively, the field quality can be enhanced by operation of the poles far from saturation without loss of field strength. An additional benefit is reduction of the harmonic content in the field distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139284
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Discharge constriction, photodetachment, and ionization instabilities in electron-beam-sustained discharge excimer lasers (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 904-914 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rare gas–halogen excimer lasers excited by electron-beam-sustained discharges (EBSD) will operate stably for only a limited length of time (hundreds of nanoseconds to a few microseconds). In this paper, results from a multidimensional model for an EBSD KrF laser are used to study various aspects of discharge ionization and geometric stability, and the relationship between the two. We examine the effects of photodetachment of electrons from the halogen negative ion, of circuit response, and of nonuniform e-beam power deposition upon the onset of discharge instabilities. We find that both spontaneous emission from KrF* and laser oscillation resulting in photodetachment of electrons from F− can initiate an ionization instability. By operating with high impedance electrical circuits, the tendency towards instabilities by this effect can be reduced. We also find that the spatial uniformity of the e-beam power deposition is directly correlated with both the rate of discharge constriction and the time at which the discharge suffers an ionization instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337331
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Multidimensional modeling of transverse avalanche laser discharges: Applications to the HgBr laser (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2406-2423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Geometrical considerations are important with respect to the stability and efficiency of avalanche electric discharge lasers. Parameters such as the electrode contours and the distribution of preionization electrons affect excitation rates through the relative values of the local electric field, local depletion of initial species, and through the response of the discharge circuitry to spatially dependent conditions within the plasma. Constriction of the discharge and subsequent impedance mismatch of the discharge to the pulse forming line result from these spatial nonuniformities. In this paper geometrical effects in the mercury bromide electric discharge laser are examined by comparing the results from a multidimensional discharge and kinetics model with experimental observations. The code models electron and heavy particle kinetics and laser intensity in time and one spatial dimension: parallel to the electrodes and perpendicular to the optical axis. Quantities whose spatial dependence is perpendicular to this dimension, such as the contours of the electrodes, are accounted for through their impact on the local electric field. HgBr laser efficiency and spatial characteristics are examined as a function of stored electrical energy, the impedance of the pulse-forming circuitry, electrode contours, and profile of the preionization electron density. Parasitic discharges within the gas, but exterior to the optical cavity, are examined as a mechanism through which the magnitude of the preionization density can effect laser efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334349
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hybrid undulator design considerations
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 250 (1986), S. 100-109 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(86)90868-5
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    Paper (German National Licenses)
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