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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Generation of pure ion beams by field ionization of laser-excited Rydberg atoms (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1619-1624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sodium atoms (108–1011 cm−3) effused from an oven were stepwise excited from their ground state to a Rydberg state ns or nd (20≤n≤26) by two pulsed dye lasers (∼5–10 ns, ∼100 μJ, ∼1.6-mm-diam spot). The laser energy density necessary to saturate the excitation processes from the ground state to the Rydberg state is ∼ several mJ/cm2. About 50 ns after the laser irradiation, a pulsed electric field (0.5–5.5 kV/cm) was applied to the Rydberg atoms to ionize them and accelerate the resulting ions. Thus, a pulsed sodium ion beam of purity 〉99.99% was obtained with a maximum total electric charge of ∼5 pC and a pulse width of ∼120 ns full width at half maximum. The total electric charge of the ion beam is estimated including the effect of space-charge field of the beam ions, and is in good agreement with the experimental values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341809
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anode discharge mode and cathodic plasma state in high-current vacuum arcs (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4127-4132 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anode surface states and traces of the cathode spots after arcing of various anode discharge modes in vacuum have been studied in the current range of 5–20 kA. Spectroscopic measurements of the radial electron temperature profile in the cathode region, which is related to the distribution of the current density, have also been performed to investigate the cathodic plasma state of the arcs in the various anode modes. The arc of a half-wave sinusoidal current of 60 Hz was burned between a 60-mm-diam anode and a 30-mm-diam cathode spaced 4 mm apart. The electrodes were made of oxygen-free, high-conductivity copper. The cathode spots spread uniformly over the entire cathode and a uniform current density profile was obtained in the diffuse-arc mode. It was found, however, that the cathode spots bunch together and the current density profiles peak at the center of the discharge in the anode-spot mode. The cathode-spot bunching and the nonuniformity in the current density profile become significant with a sufficient increase in arc current to cause severe erosion of the anode. Another finding was that the cathode spots spread almost uniformly over the cathode while a nonuniform current density profile appears in the diffuse arc associated with the presences of the arc-voltage fluctuation and a slight anode melting, i.e., in which the transition to the foot-point mode has begun. The occurrence of current constriction in the arc without cathode-spot bunching will be briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337493
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Soft x-ray radiation from laser plasma (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1850-1850 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Laser-target interaction was studied to make an efficient soft-x-ray source with a table-top laser system. A 1-J, 20-ns ruby laser was focused on various planar targets (Z=6 to 82). The laser power intensity on the targets was about 1011–1012 W/cm2. Spectra (2–35 nm) and intensities of soft x-ray radiation from target plasma were measured by using a 2-m grazing incidence spectrometer and a x-ray diode. Even at this low laser power intensity, high-energy radiation of 0.5–3 keV was obtained. Spectra from low-Z materials show strong line radiations over a weak continuum and those from high-Z materials consist of a continuum predominantly. The target Z-number dependence of the intensity of 0.5–3-keV radiation has a periodic structure and relates to atomic shell structures. In this experiment the maximum x-ray conversion efficiency was obtained from a 22Ti target.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140082
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Frequency of accumulation of filaments in adaxonal cytoplasm of Schwann cells of myelinated fibers of rat spinal roots (1986)
    Springer
    Acta neuropathologica 72 (1986), S. 200-202 
    Details
    ISSN: 1432-0533
    Keywords: Adaxonal cytoplasm ; Schwann cell ; Myelinated fiber ; Spinal root
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The frequency of accumulation of 6-nm filaments in the adaxonal cytoplasm of Schwann cells in the 6th lumbar dorsal and ventral roots was evaluated in 4-, 8-, 26- and 45-week-old Sprague-Dawley rats. The frequency was higher in 4- and 8-week-old (growing) rats than in 26- and 45-week old (mature) rats, and also higher in ventral than in dorsal roots in 4-, 8- and 26-week old rats. There were no clusters on certain groups of myelinated fibers according to the size of transverse axonal area, in both the ventral and dorsal roots. Therefore, this accumulation may reflect certain functions of the adaxonal cytoplasm of Schwann cell during natural growth and maturation of the axon and myelin sheath.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00685984
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    Paper (German National Licenses)
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