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  • 1
    Electronic Resource
    Electronic Resource
    Progress toward a microsecond duration, repetitively pulsed, intense-ion beam for active spectroscopic measurements on ITER : 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. 332-335 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the design of an intense, pulsed, repetitive, neutral beam based on magnetically insulated diode technology for injection into ITER for spectroscopic measurements of thermalizing alpha particle and thermal helium density profiles, ion temperature, plasma rotation, and low Z impurity concentrations throughout the confinement region. The beam is being developed to enhance low signal-to-noise ratios expected with conventional steady-state ion beams because of severe beam attenuation and intense bremsstrahlung emission. A 5 GW (e.g., 100 keV, 50 kA) 1 μs duration beam would increase the charge exchange recombination signal by 103 compared to a conventional 5 MW beam. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147862
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-intensity, neutral beam for beam-spectroscopy diagnostics : 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. 306-308 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Performance evaluation of a gas-puff neutralizer utilizing the hydrogen component of a flashover-anode, magnetized ion diode is described. A 200 cm2 source provides kiloamperes of ion flow into an annular channel 300 cm2 in cross section, 0.5 m long, into which the neutralizing H2 cloud is injected. Up to ∼50% of the H+ ion beam which flows through the cell in the absence of neutralizing gas can be converted to atomic hydrogen at the energies useful for beam spectroscopy. The detectors utilized in neutral flow measurements are also described. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146392
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  • 3
    Electronic Resource
    Electronic Resource
    Microsecond pulse width, intense, light-ion beam accelerator (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2753-2760 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A relatively long-pulse width (0.1–1 μs) intense ion beam accelerator has been built for materials processing applications. An applied Br, magnetically insulated extraction ion diode with dielectric flashover ion source is installed directly onto the output of a 1.2 MV, 300-kJ Marx generator. The diode is designed with the aid of multidimensional particle-in-cell simulations. Initial operation of the accelerator at 0.4 MV indicates satisfactory performance without the need for additional pulse shaping. The effect of a plasma opening switch on diode behavior is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144414
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of wall stabilization and active control of low-n magnetohydrodynamic instabilities in a tokamak (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1926-1934 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The High Beta Tokamak-Extended Pulse (HBT-EP) experiment [J. Fusion Energy 12, 303 (1993)] combines an internal, movable conducting wall with a high-power, modular saddle coil system to provide passive and active control of long wavelength magnetohydrodynamic (MHD) instabilities. Systematic adjustment of the radial position, b, of the conducting wall elements in relation to the surface of the plasma (minor radius a) resulted in the suppression of β-limiting disruptions for discharges in which b/a〈1.2 and a positive plasma current ramp was maintained. Conducting wall stabilization of kink instabilities was observed in discharges with strong current ramps and in plasmas with β values near the Troyon stability boundary. The frequency of slowly growing modes that persisted in wall-stabilized discharges was controlled by applying oscillating m=2, n=1 resonant magnetic perturbations. A compact, single-phase saddle coil system permitted modulation of the rotation velocity of internal m/n=2/1 instabilities by a factor of 2. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871988
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  • 5
    Electronic Resource
    Electronic Resource
    Power and mode diagnostics for high-power microwave sources with over-moded output (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 937-937 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A microwave calorimeter has been developed in the course of our work on virtual-cathode-oscillator microwave generators which may have application to gyrotrons used for plasma heating. The absorbing element uses a novel conductor array which provides a means of temperature-rise detection. Provision has been made to observe the spatial pattern of the microwave energy deposition with an infrared imaging system. The infrared image provides output mode information and a noncontacting measure of the total energy in the microwave pulse. The microwave absorption of the calorimeter has been evaluated from 8 to 40 GHz with broadband TM01 mode launchers. Mode selective directional couplers are also being developed to provide an independent measure of the mode number for the transverse magnetic (TM0n) modes which are generated by the virtual-cathode oscillator. This technique can also be utilized to discriminate other higher-order modes.1 This work was supported by the U. S. Department of Energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138048
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  • 6
    Electronic Resource
    Electronic Resource
    Intense ion beam optimization and characterization with infrared imaging (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3223-3231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed two-dimensional calorimetry with infrared imaging of beam targets to optimize and measure the energy-density distribution of intense ion beams. The technique, which measures a complete energy-density distribution on each machine firing, has been used to rapidly develop and characterize two very different beams—a 400 keV beam used to study materials processing and an 80 keV beam used for magnetic fusion diagnostics. Results of measurements, using this technique, varying the diode applied magnetic field strength and geometry, anode material type and configuration, and anode-cathode gap spacing are presented and correlated with other observations. An assessment of calorimeter errors due to target ablation is made by comparison with Faraday cup measurements and computer modeling of beam-target interactions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365629
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