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  • 1
    Electronic Resource
    Electronic Resource
    Role of optical properties of metallic mirrors in microcavity structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 2825-2829 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In thin metal films the phase change on reflection of incident light is dependent on the wavelength, the angle of incidence, the type of metal, and the metal thickness. These properties have been exploited to improve the performance of planar metal mirror microcavities. We model substantial alteration of peak emission wavelength and linewidth with mirror thickness. This allows the tuning of the cavity resonance wavelength by variation of metal mirror thickness. The dependence of the phase change on wavelength and angle of incidence can also be used to suppress the angular dependence of the cavity resonance wavelength. These effects are observed in silver-mirrored cavities containing the polymers poly(p-phenylene vinylene), (PPV), and a cyano-substituted derivative of PPV, MEH-CN-PPV. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363940
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  • 2
    Electronic Resource
    Electronic Resource
    Calibration and error analysis of a new magnetic sphere microrheometer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3268-3275 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetic microrheometer has been built, which can be used to study the rheological properties of materials that are available in small volumes and have distinct phases. The instrument performs creep tests (displacement in response to an imposed force), using magnetic microspheres of diameter 7 μm and larger. Displacement histories of the spheres are video-recorded and analyzed, with high resolution, using computer vision methods. In this article, results are presented for the magnetic force calibration and for a test using a Newtonian fluid to evaluate the performance of the instrument. A comprehensive analysis of the different sources of error in measuring Newtonian fluid viscosities was performed, resulting in quantitative delineation of the accuracy and precision of the microrheometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144561
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropic hardness and fracture toughness of highly aligned YBa2Cu3O7−δ (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2363-2367 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hardness and fracture toughness of aligned YBa2Cu3O7−δ obtained by melt processing was found to be highly anisotropic. Indentation measurements show that the (001), (100), and (010) planes are the preferred fracture planes in this material and that the critical stress intensity factor for propagating a crack on the (001) basal plane is the lowest, i.e., Kc001〈Kc100 or Kc010. Indentation crack length measurements on the (001) basal plane with the impression diagonals oriented parallel to the [100] and the [010] directions, indicate that the fracture toughness of these planes is K100/010air∼0.7 MPa m1/2. The hardness in this orientation was found to be 6.7 GPa. Measurements on a plane perpendicular to the basal plane resulted in a lower hardness of ∼3.8 GPa. This reduction in hardness is influenced by the extensive preferential cleavage of the (001) basal plane boundaries. The extremely low values of the fracture toughness suggest that considerable toughening would have to be achieved in melt-textured 123 for any practical bulk application. The presence of 211 phase and silver particles may serve to enhance the fracture toughness of aligned 123 by crack deflection and crack tip blunting respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351090
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  • 4
    Electronic Resource
    Electronic Resource
    The hydrogen decrepitation behavior of alloys and magnets based on Nd16Fe76B8 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4626-4628 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hydrogen decrepitation (HD) behaviors of various forms of the permanent magnet alloy Nd16Fe76B8 and stoichiometric composition Nd11.8Fe82.3B5.9 have been investigated to provide background information on the production of sintered magnets by the HD process. The influence of the initial microstructures of the alloys on the subsequent HD behavior has been examined. Thus the as-cast ingots, homogenized ingots, and sintered magnets have been exposed to hydrogen at 2 bars of pressure at room temperature and the hydrogen absorption behaviors investigated by differential thermal analysis. The morphologies of the HD powders have been studied by scanning electron microscopy and have been related to the initial microstructures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344835
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  • 5
    Electronic Resource
    Electronic Resource
    New reflectometer systems for the DIII-D tokamak (abstract) : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4665-4665 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: During a machine vent in December 1991, two new reflectometer systems were successfully installed and tested on the DIII-D tokamak. The first is an X-mode broadband system primarily intended for density profile measurements, utilizing BWO sources and covering Q and V frequency bands (33–50 and 50–75 GHz). The second system is an adaptation of a pre-existing inside launch (high field side) ECRH waveguide to provide an inside launch reflectometer capability at the same frequencies and polarization as an outside launch fixed frequency O-mode system. The new systems will have a dual role in both directly supporting the DIII-D physics program, and also acting as flexible and adaptable test beds for the development of reactor relevant reflectometer systems, such as required for ITER. Specific examples of planned measurements include investigation of possible in/out plasma asymmetries at the L–H transition and ELMs, and demonstration of routine and reliable density profile measurements. It is expected that preliminary data from the inside launch system will be available by the time of the conference. This work is supported by the U. S. Department of Energy under Grant No. DE-FG03-86-ER53225 and General Atomics subcontract SC120536 under DOE Contract No. DE-AC03-89ER51114.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143656
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  • 6
    Electronic Resource
    Electronic Resource
    Application of high-resolution interferometry to plasma density measurements on TEXT-Upgrade : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4990-4992 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: High-resolution interferometry using far-infrared laser radiation is employed on TEXT-Upgrade to measure the spatial and temporal evolution of the electron density profile as well as small-scale perturbations. Perturbations to the electron density induced by naturally occurring sawtooth oscillations or externally imposed gas modulations can be used to ascertain the local particle flux and transport coefficients in the plasma interior. Density islands associated with Mirnov activity can also be resolved, providing detailed information on the density profile at island X and O points. Implementation of a second orthogonal view will allow accurate determination of the density profile in the various asymmetric plasma configurations of TEXT-Upgrade.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143523
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  • 7
    Electronic Resource
    Electronic Resource
    Electron cyclotron emission imaging diagnostic system for Rijnhuizen Tokamak Project : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 998-1001 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 16-channel electron cyclotron emission (ECE) imaging diagnostic system has been developed and installed on the Rijnhuizen Tokamak Project for measuring plasma electron cyclotron emission with a temporal resolution of 2 μs. The high spatial resolution of the system is achieved by utilizing a low cost linear mixer/receiver array. Unlike conventional ECE diagnostics, the sample volumes of the ECE imaging system are aligned vertically, and can be shifted across the plasma cross-section by varying the local oscillator frequency, making possible 2D measurements of electron temperature profiles and fluctuations. The poloidal/radial wavenumber spectra and correlation lengths of Te fluctuations in the plasma core can also be obtained by properly positioning the focal plane of the imaging system. Due to these unique features, ECE imaging is an ideal tool for plasma transport study. Technical details of the system are described, together with preliminary experimental results. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149367
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  • 8
    Electronic Resource
    Electronic Resource
    UCLA FIR diagnostic systems on TEXT and developments for TEXT Upgrade (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3071-3071 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A multipurpose multiview far-infrared diagnostic system is being designed and constructed for the TEXT Upgrade. The system's capabilities, designed to enhance the applications of the present FIR system on TEXT, will include two-view interferometry, polarimetry, and collective scattering in order to measure the plasma density profile, current profile, and density fluctuation distribution. The interferometer/polarimeter system will possess high spatial (Δx=1.5 cm) and high-density (≤5×1010 cm−3) resolution. Tomographic reconstruction techniques will be employed to investigate both the equilibrium and perturbed profiles of plasma density. This represents an extension of the present work on TEXT where MHD effects such as sawteeth, Mirnov oscillations, and disruptions have been studied. Two-view multichannel collective scattering (1≤k⊥≤20 cm−1) will allow the kr and kθ spectra to be measured simultaneously. Heterodyne detection permits the wave propagation direction and multiple modes to be resolved unambiguously. Cross correlation of signals from each view may produce significant improvement in the scattering system spatial resolution. A reflectometry system will also be installed to study fluctuations and provide more localized measurement. This work was supported by U.S. DOE contract No. DE-FG03-86ER-53225 and DE-FG03-88ER-53267.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141733
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  • 9
    Electronic Resource
    Electronic Resource
    Recent developments in optically pumped far-infrared lasers for plasma diagnostics (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3307-3307 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Optically pumped far-infrared (FIR) lasers are widely utilized in the diagnosis of fusion plasmas. Applications such as interferometry, polarimetry, and collective scattering all rely heavily on the characteristics of such lasers. In particular, the stability, available power, and wavelength of the FIR laser are extremely important in establishing system performance. This describes recent development work at UCLA directed at improving the above laser characteristics. Stability improvement is investigated via the use of a FIR ring cavity which automatically eliminates the feedback effects of CO2 pump radiation. Modifications in the optical design of both CO2 and FIR laser cavities have led to increased FIR output power. Finally, the use of a novel FIR output coupler and increased pump power has increased the number of high-power FIR wavelengths available for plasma diagnostic applications. This work was supported by U.S. DOE contract No. DE-FG03-86ER-53225.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141624
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  • 10
    Electronic Resource
    Electronic Resource
    Development and design of a nonmagnetic and nonconducting interferometer optical system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1582-1584 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The use of a 0.185-mm far-infrared (FIR) laser interferometer on MTX required the design and development of optical components which are nonmagnetic and nonconducting. This arose from the requirement that the path length of the FIR interferometer not change by more than (1)/(50) of a wavelength during the half-second plasma pulse. The time-dependent stray magnetic fields, 7000–400 G over the optical table area, generate strong eddy current forces which would produce path length changes greater than the design criteria if the components were metallic. Thus, the optical tower which supports the optical tables, one above and one below the tokamak, is a composite structure of 304 stainless steel and G-10 fiberglass. Also, the optical table and components are made of G-10 with a minimum of 304 stainless-steel parts to avoid eddy current forces and maintain structural rigidity. The design criteria of the optical components are discussed with a comparison of suitable materials. A discussion of the process which was developed to fabricate plastic parabolic beam expanding and focusing mirrors with a metallized reflective surface is presented. The mixer and electronics enclosure design minimizes eddy current forces by use of printed circuit board material while maintaining excellent EMI/RFI shielding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140271
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