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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of Faraday rotation in TFTR plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1994-1996 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recent results of simultaneous measurements of line electron density and poloidal field-induced Faraday rotation on the multichannel far infrared (FIR) interferometer/polarimeter on tokamak fusion test reactor (TFTR) are presented. The procedures and results of the calibration are described in detail. The effects of various errors in the measurement, as well as the problem of cross-coupling laser beams, are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138764
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  • 2
    Electronic Resource
    Electronic Resource
    Two-wavelength infrared interferometer/polarimeter system for CIT (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1629-1631 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The results of a feasibility study of a two-wavelength infrared interferometer/polarimeter system for measurements of electron density and plasma current profiles in the Compact Ignition Tokamak (CIT) are presented. The system utilizes CO2 lasers at a wavelength of 10.6 μm, and water-vapor lasers at 28 μm. Both magneto-optic and electro-optic polarization-modulation techniques have been used to determine the sensitivity and time response of the polarimetry at 10.6 μm. Measurement of a simulated plasma Faraday rotation demonstrated a sensitivity of approximately 0.01° for a CO2 laser polarimeter with an electro-optic CdTe crystal modulator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140272
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of thickness on the electrical properties of metalorganic chemical vapor deposited Pb(Zr, Ti)O3 (25–100 nm) thin films on LaNiO3 buffered Si (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1509-1515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pb(Zr, Ti)O3 (PZT) thin films with (100) preferred orientation were prepared using metalorganic chemical vapor deposition on LaNiO3 (LNO) buffered platinized Si with thickness varying from 25–100 nm. The dependence of electrical properties of PZT films on thickness was studied using several techniques, including polarization–electric field (P–E), temperature variable current–voltage (I–V), and capacitance–voltage (C–V) measurements. Because of the formation of Schottky barriers at ferroelectric/electrode interfaces, built-in electric fields are present. A progressive increment in carrier concentration and interfacial built-in electric field versus reducing PZT film thickness was observed, which is believed to be a dominant factor controlling the measured dielectric/ferroelectric properties. The higher built-in electric field in thinner PZT films would pin the dipoles at the interfacial region and retard the response of dipoles to the external electric field. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1383262
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  • 4
    Electronic Resource
    Electronic Resource
    Drift-wave-like density fluctuations in the Advanced Toroidal Facility (ATF) torsatron (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 398-413 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Density fluctuations in low-collisionality, low-beta (β∼0.1%), currentless plasmas produced with electron cyclotron heating (ECH) in the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)] have been studied using a 2 mm microwave scattering diagnostic. Pulsed gas puffing is used to produce transient steepening of the density profile from its typically flat shape; this leads to growth in the density fluctuations when the temperature and density gradients both point in the same direction in the confinement region. The wave number spectra of the fluctuations that appear during this perturbation have a maximum at higher k⊥ρs (∼1) than is typically seen in tokamaks. The in–out asymmetry of the fluctuations along the major radius correlates with the distribution of confined trapped particles expected for the ATF magnetic field geometry. During the perturbation, the relative level of the density fluctuations in the confinement region (integrated over normalized minor radii ρ from 0.5 to 0.85) increases from ñ/n∼1% when the density profile is flat to ñ/n∼3% when the density profile is steepened. These observations are in qualitative agreement with theoretical expectations for helical dissipative trapped-electron modes (DTEMs), which are drift-wave instabilities associated with particle trapping in the helical stellarator field; they suggest that trapped-electron instabilities may play a role in constraining the shape of the density profile in ATF, but have little effect on global energy confinement. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870966
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  • 5
    Electronic Resource
    Electronic Resource
    MIRI: A multichannel far-infrared interferometer/polarimeter for TFTR (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 938-938 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A double path multichannel far-infrared interferometer/ polarimeter employing retroreflectors for density and current profile determination has been developed for TFTR. The system containing about 400 optical components is mounted on a 70 000-lb. vibration-free stand which encircles TFTR. Optically pumped cw CH3OH (λ=110 μm, p(approximately-equal-to)100 mW) twin lasers with a frequency separation of l MHz are employed as a source. Quasioptical Schottky diodes (NEP(approximately-equal-to)l0−9 W(Hz)1/2) are used as detectors. Considerable efforts are devoted to have remote control capabilities for future D–T operation. The detailed design characteristics of this system together with preliminary results of chord averaged density information will be presented. Also the theoretical aspects of Faraday rotation for TFTR plasma will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138051
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  • 6
    Electronic Resource
    Electronic Resource
    CO2 laser polarimeter for measurement of plasma current profile in Alcator C-Mod : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 376-378 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A multichannel infrared polarimeter system for measurement of the plasma current profile in Alcator C-Mod has been designed, constructed, and tested. The system utilizes a cw CO2 laser at a wavelength of 10.6 μm. An electro-optic polarization-modulation technique has been used to achieve the high sensitivity required for the measurement. The recent results of the measurements as well as the feasibility of its application on international thermonuclear experimental reactor are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146417
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  • 7
    Electronic Resource
    Electronic Resource
    A difluoromethane laser interferometer system on ATF : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2891-2892 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 15-channel far-infrared (FIR) interferometer system has been constructed to measure the electron densities in the Advanced Toroidal Facility (ATF) device. The system consists of a pair of cw 214 μm difluoromethane (CH2F2) lasers, optically pumped by separate CO2 lasers. The large number of channels is achieved by the use of reflective beam expansion optics to create a beam of 2 cm×45 cm. After passing through the plasma discharge, the beam is dissected by an array of 15 off-axis paraboloid reflectors, each of which illuminates a single Schottky-diode detector. The system can also be operated at a wavelength of 119 μm for high density experiments by changing the gas in FIR laser cavities to methanol. Details of the system are described and the recent results of the measurements are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141765
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  • 8
    Electronic Resource
    Electronic Resource
    Tritium to deuterium ratio measurement by collective Thomson scattering : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 683-685 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique is proposed for the determination of the tritium to deuterium density ratio in ITER using collective Thomson scattering at a wavelength of 10 μm. The measurement is made by viewing the component of scattered laser power nearly perpendicular to the magnetic field giving rise to ion cyclotron modulation of the scattered spectrum. The tritium/deuterium ratio may be inferred by a deconvolution of the scattered laser power. Due to the narrow bandwidth of the scattered signal and the spatially varying magnetic field, a narrowband heterodyne imaging array receiver will be required to observe the scattered spectrum. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147672
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  • 9
    Electronic Resource
    Electronic Resource
    A feasibility study of an infrared tangential viewing polarimeter for measurement of the electron density profile in ITER (abstract) : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 698-698 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Preliminary results of a feasibility study of a CO2 laser tangential viewing polarimeter for measuring electron density profiles in ITER are reported. For ITER plasma parameters and a polarimeter wavelength of 10.6 μm, a Faraday rotation of up to 26° is predicted. An electro-optic polarization modulation technique has been developed at ORNL. Laboratory tests of this polarimeter demonstrated a sensitivity of ≤0.01°. Because of the similarity in the expected Faraday rotation in ITER and Alcator C-Mod, a collaboration between ORNL and the MIT Plasma Fusion Center has been undertaken to test this polarimeter system on Alcator C-Mod. A 10.6 μm polarimeter has been constructed and integrated into the existing C-Mod multichannel two-color interferometer. Detailed analyses and the preliminary results of the C-Mod measurements will be shown.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147909
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  • 10
    Electronic Resource
    Electronic Resource
    Microwave scattering diagnostic on the Advanced Toroidal Facility torsatron (abstract)a) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 841-841 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 2 mm scattering diagnostic used to study density fluctuations of the electron cyclotron resonance heated plasma in the Advanced Toroidal Facility is described. A four-channel flexible antenna design was chosen to monitor fluctuations within the wave number range of 3〈k⊥〈20 cm−1 and to locate the scattering volume anywhere in the stellarator minor cross section. Special attention was paid to the system calibration and to the normalization of the k spectra. Analysis of the diagnostic noise showed that the main source of spurious signal was a scattering from high-level edge turbulence driven by the second-harmonic radiation from the gyrotron used for plasma heating. This spurious signal was suppressed using waveguide filters and rearrangement of the microwave circuit elements. Evidence in support of direct scattering from a well-defined plasma volume was found. Good correlation of the scattered waves' intensity with the density scale length was observed. Use of a dual-homodyne circuit configuration made is possible to determine that the plasma density fluctuations were propagating in the electron diamagnetic direction. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146242
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