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  • 1
    Electronic Resource
    Electronic Resource
    Optimization of the channeling radiation source crystal to produce intense quasimonochromatic x rays (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2995-3002 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Channeling radiation is a source of intense, tunable, quasimonochromatic x rays produced by electrons traveling along a direction of symmetry through a crystal. We analyze the effect of the channeling source crystal, through both its composition and lattice structure, on the number of photons emitted per electron, the linewidths of the radiation, and the maximum sustainable currents to identify the crystal which will yield the most photons in a bandwidth of less than 10% full width at half maximum (FWHM). Although high atomic number (Z) crystals produce a greater number of photons per electron, given their poor thermal properties these crystals cannot sustain as high average currents as lower Z crystals. The linewidths of the channeling radiation emitted from high Z crystals are as large as 50% FWHM, and electrons are dechanneled more quickly in these crystals, limiting their use as a quasimonochromatic x-ray source. Given its exceptional thermal conductivity and narrow linewidths, diamond is the optimal source crystal for the production of intense, quasimonochromatic x rays using channeling radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349328
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  • 2
    Electronic Resource
    Electronic Resource
    Reducing slip in a far-infrared free-electron laser using a parallel-plane waveguide (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1283-1285 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There are several interesting applications for a picosecond, far-infrared (100–1000 μ) free-electron laser. One obstacle to its development is the slip that occurs between the electron beam and the radiation. This can be reduced by operating the laser in a parallel-plane waveguide, and choosing the laser parameters and transverse guide dimension such that the group velocity of the wave nearly matches the axial velocity of the electrons. The laser wavelength depends on both the electron energy and the waveguide dimension, and the laser can be tuned by varying either. Both the tuning characteristics and the slip as a function of wavelength are different from those of a conventional free-electron laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103460
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  • 3
    Electronic Resource
    Electronic Resource
    Propagation of a picosecond-duration, relativistic electron beam through hydrogen at atmospheric pressures (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 575-580 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experiment demonstrating the propagation of a 42-MeV electron beam from an rf linear accelerator through 1 m of H2 at pressures from 10−3 to 1.25 atm is reported. Measurements were made of the transmitted current and the beam's radius, transverse position, and angular divergence along the path. The beam current was fully transmitted at all pressures, without the often detrimental plasma interactions (space-charge neutralization, magnetic neutralization, and various plasma instabilities) seen in previous studies. The observed beam expansion was consistent with calculations of multiple scattering. The propagation can be attributed to the 4-ps duration of the accelerator's electron bunches. This time is three to four orders of magnitude shorter than that used in the earlier work and is shorter than the growth times for the beam-plasma interactions. Such a beam should prove suitable for a gas-loaded free-electron laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341972
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of unit lens alignment and surface roughness on x-ray compound lens performance (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 48-52 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The required alignment tolerances and surface roughness for unit lens elements in a compound refractive lens (CRL) for x rays are discussed. Contrary to what one might expect and what has been stated in the patent literature, alignment tolerances are large and for typical parameter values the effect of misalignment is minor. For a parabolic lens the focusing properties of the CRL are unaltered by misalignment and there is a small increase in absorption. For a lens with spherical aberration, there is a slight change in focal length, a minor translation of the image, and a small increase in absorption. This article also shows that lens gain is not appreciably reduced if the phase shift that is introduced by the roughness is limited to ±π/4 or if the transverse period of the roughness exceeds a specified value. The CRL can benefit from a managed misalignment of the elements to reduce the phase error introduced by surface imperfections of the lens. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1331326
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  • 5
    Electronic Resource
    Electronic Resource
    Gas-loaded free-electron lasers (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1311-1312 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gas-loaded free-electron lasers offer the prospect of broad wavelength tuning and short wavelength operation without the need for high electron beam energy. Experiments that were performed using hydrogen gas in the infrared confirm the theory, and new experiments are described for the extreme ultraviolet (XUV) region using helium gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859547
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  • 6
    Electronic Resource
    Electronic Resource
    Channeling Radiation (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 33 (1983), S. 453-504 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.33.120183.002321
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  • 7
    Electronic Resource
    Electronic Resource
    Electron channeling radiation from diamonds with and without platelets (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1661-1664 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Channeling-radiation spectra produced by planar-channeled, 30.5-MeV electrons in Type-Ia and Type-IIa natural diamonds have been measured and are compared with previous results for 54.5-MeV electrons. Because of the presence of platelets precipitated along the (100) planes in the Type-Ia diamond, the energies of the (100) spectral peaks are shifted downward relative to those for the Type-IIa diamond. We have developed a model to explain this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334433
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  • 8
    Electronic Resource
    Electronic Resource
    Editorial statement (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. i 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476783
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  • 9
    Electronic Resource
    Electronic Resource
    Pulse stretching of Q-switched lasers (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 123-127 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Pulse stretching of a passively Q-switched ruby laser is accomplished by the introduction of a non-linear absorber into the laser cavity. Single pulses of length 150 to 400 nsec are observed. The non-linear absorption is obtained by using a Rayleigh-wing scatterer as the solvent for a bleachable dye. This approach is unique in that stretched Q-switched pulses may be obtained by the introduction of a single liquid into the laser resonator with no electronics necessary. Since the Rayleigh Frequency is within the gain lineshape of the active medium, threshold for the stimulated Rayleigh scattering is exceeded at relatively low power densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419270
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