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  • 1
    Electronic Resource
    Electronic Resource
    Measurement and interpretation of electron cyclotron emission on JET (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 940-940 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The first two channels of the JET electron cyclotron emission diagnostic have been in regular use for several months. A Michelson interferometer provides several hundred broadband spectral measurements (with time resolution 15 ms) on every plasma pulse. The second cyclotron harmonic in these spectra is used to deduce absolutely calibrated electron temperature profiles in the outer half of the plasma. Current measurements and their interpretation will be discussed, and the full diagnostic system, for the determination of two-dimensional profiles, will be described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138055
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  • 2
    Electronic Resource
    Electronic Resource
    Recent developments in millimeter wave diagnostics at JET (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1644-1644 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: There are presently two substantial millimeter wave diagnostic systems on JET in different stages of development: an established, comprehensive electron cyclotron emission (ECE) system and a recently installed multichannel reflectometer. The ECE system comprises a ten-channel antenna array in the vacuum vessel, an oversized waveguide transmission system, and an assembly of ECE instrumentation—Michelson and Fabry Perot interferometers, grating polychromator, and heterodyne radiometer. From measurements made with the Michelson interferometers the time and spatial dependencies of the electron temperature in the poloidal cross section are determined with resolutions of ∼15 cm and 15 ms, respectively. From measurements made with the other instruments, the time dependence of the temperature at specific locations is determined with resolutions (approximately-greater-than)2 cm and (approximately-greater-than)100 μs. The sensitivity is such that changes in temperature down to approximately a few eV can be clearly resolved. The multichannel reflectometer will probe the plasma in the ordinary mode at 12 frequencies in the range 18–80 GHz. It will have two modes of operation: narrow-band swept and fixed frequency. In the swept mode the spatial profile of the electron density will be measured with a time resolution (approximately-greater-than)200 μs and a spatial resolution ∼1 cm, while in the fixed frequency mode of operation movements in the different density layers will be measured with a sensitivity approximately a few mm and bandwidth (approximately-greater-than)100 kHz. In addition, a possible collective Thomson scattering diagnostic for measuring the velocity distribution of the confined α particles in the DT phase of JET operation is currently being studied. This system would use a high-power millimeter wave (140 GHz) gyrotron and heterodyne detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140172
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  • 3
    Electronic Resource
    Electronic Resource
    ITER physics program and implications for plasma measurements (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. 887-887 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Key objectives of the first ten years of ITER operation are the investigation of the physics of burning plasmas and the demonstration of long-pulse ignited plasma technologies. These include studies of plasma confinement and stability, divertor operation, disruption mitigation and control, noninductive current drive, and steady state operation under conditions when the plasma is heated predominantly by alpha particles. The ITER operational plan envisages two and a half years for commissioning and initial operation with hydrogen plasmas at up to 100 MW of auxiliary heating power when initial tests of divertor operation and evaluation of disruption effects will be made. In order to meet the operational and programmatic goals, it will be necessary to make a wide range of plasma measurements. In this article the preliminary operational plan and physics program are presented and the implications for plasma measurements are outlined. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147712
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  • 4
    Electronic Resource
    Electronic Resource
    Fast ECE correlation radiometry for fluctuation measurements in JET and PBX-M : 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. 4619-4621 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We discuss the fluctuation characteristics expected from MHD modes including ballooning modes and show how they can be studied using measurements of ECE. A novel technique, ECE correlation radiometry, which enables the location and spatial structure of long wavelength (L(approximately-greater-than)0.1×a) MHD modes to be determined, is described. Measurements on JET with a 44-channel ECE heterodyne radiometer are presented and show the existence of high-frequency (high n number) MHD modes under high poloidal beta, pellet-enhanced performance (PEP) plasma conditions. Similar measurements are planned for PBX-M and the measurement system is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143689
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  • 5
    Electronic Resource
    Electronic Resource
    Recent developments in microwave reflectometry at JET (invited) : Eighth topical conference on high-temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2823-2828 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The latest developments in microwave reflectometry work at JET are described. A multichannel reflectometer system which can measure either the spatial profile of the electron density, or the propagation of rapid density perturbations, is described and some illustrative results are presented. The possible use of reflectometry as a technique for determining the total internal magnetic field is discussed and the results of an experiment to test the basis of this method are presented. Finally, a new technique, correlation reflectometry, which has been developed specifically for studying density fluctuations is described and some preliminary results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141796
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  • 6
    Electronic Resource
    Electronic Resource
    Key issues in ITER diagnostics: Problems and solutions (invited) : 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. 391-396 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The key problems associated with designing diagnostic systems for the International Thermonuclear Experimental Reactor (ITER) are identified and representative solutions are described. The plans for dealing with some outstanding issues are briefly presented. The detailed work is specific to the ITER, but much of what has been learned will be applicable to any reactor grade tokamak plasma. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149506
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  • 7
    Electronic Resource
    Electronic Resource
    ITER physics program and implications for plasma measurements (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1250-1255 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Key objectives of the first ten years of ITER operation are the investigation of the physics of burning plasmas and the demonstration of long-pulse ignited plasma technologies. These include studies of plasma confinement and stability, divertor operation, disruption mitigation and control, noninductive current drive, and steady state operation under conditions when the plasma is heated predominantly by alpha particles. The ITER operational plan envisages two and a half years for commissioning and initial operation with hydrogen plasmas at up to 100 MW of auxiliary heating power when initial tests of divertor operation and evaluation of disruption effects will be made. In order to meet the operational and programmatic goals, it will be necessary to make a wide range of plasma measurements. In this article the preliminary operational plan and physics program are presented and the implications for plasma measurements are outlined. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148221
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  • 8
    Electronic Resource
    Electronic Resource
    An overview of ITER diagnostics (invited) (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 862-867 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The requirements for plasma measurements for operating and controlling the ITER device have now been determined. Initial criteria for the measurement quality have been set, and the diagnostics that might be expected to achieve these criteria have been chosen. The design of the first set of diagnostics to achieve these goals is now well under way. The design effort is concentrating on the components that interact most strongly with the other ITER systems, particularly the vacuum vessel, blankets, divertor modules, cryostat, and shield wall. The relevant details of the ITER device and facility design and specific examples of diagnostic design to provide the necessary measurements are described. These designs have to take account of the issues associated with very high 14 MeV neutron fluxes and fluences, nuclear heating, high heat loads, and high mechanical forces that can arise during disruptions. The design work is supported by an extensive research and development program, which to date has concentrated on the effects these levels of radiation might cause on diagnostic components. A brief outline of the organization of the diagnostic development program is given. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147710
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  • 9
    Electronic Resource
    Electronic Resource
    Large tokamak diagnostics (invited) (abstract) : 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. 296-296 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In order to meet the objectives of safely operating, controlling, and optimizing a long-pulse ignited plasma in next-step devices (e.g., ITER), it will be necessary to measure accurately and reliably a wide range of plasma parameters. The choice of measurement techniques and design of the corresponding diagnostic systems will be strongly influenced by the specific measurement requirements and by the practical constraints arising from the harsh radiation environment, limited access, and the need for very high levels of reliability and availability. The experience gained on existing large tokamaks such as JET is a good starting point for the diagnostic design but the extrapolation to next step conditions is substantial and it is already obvious that it will not be possible to apply some of the established techniques. For some measurements new approaches are required and specific R&D is necessary. In this paper, the likely measurement requirements will be outlined and the practical constraints summarized. Potentially suitable measurement techniques will be identified and the problems of implementation briefly discussed. Attention will be concentrated on those areas where the most difficult problems are foreseen and where new approaches are required. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146389
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  • 10
    Electronic Resource
    Electronic Resource
    Plasma diagnostics for INTER-FEAT : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 545-550 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A comprehensive set of diagnostics is planned for ITER-FEAT. The design of the systems is a substantial technical challenge because of the combination of the harsh environment with the demanding measurement requirements. Through a combination of careful choice of technique, materials, and design, supported by dedicated research and development, an extensive diagnostic set has been developed. The designs are based on existing techniques as much as possible but in some cases novel approaches have to be adopted. In the article the requirements for measurements are outlined and representative diagnostic designs are presented. Key issues in the design are identified and areas requiring further development are highlighted. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310588
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