Alpha Particle Collective Thomson Scattering in TFTR. PDF Download
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Author: Richard Edward Aamodt
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Author: Richard Edward Aamodt
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
A collective Thomson scattering diagnostic is being implemented on TFTR to measure alpha particle, energetic and thermal ion densities and velocity distributions. A 60 GHz, 0.1-1 kW gyrotron will be used as the transmitter source, and the scattering geometry will be perpendicular to the magnetic field in the extraordinary mode polarization. An enhanced scattered signal is anticipated from fluctuations in the lower hybrid frequency range with this scattering geometry. Millimeter wave collective Thomson scattering diagnostics have the advantage of larger scattering angles to decrease the amount of stray light, and long, high power, modulated pulses to obtain improved signal to noise through synchronous detection techniques.
Author: J. S. Machuzak
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 16
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Author: J. S. Machuzak
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 16
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Lodestar has been an active participant in the low power Collective Thomson Scattering (CTS) diagnostic at TFTR in collaboration with MIT. Extensive studies were conducted regarding the use of gyrotron scattering as a low cost diagnostic for both energetic ions and alpha particles on TFTR. The numerical scattering code has been improved and compared with similar code developed at JET. The authors have participated and assisted in the CTS experiments through onsite visits and have successfully performed most of the data analysis tasks remotely. Through their analysis on the initial data base accumulated, they are able to understand qualitatively the general features of the anomalous large scattered signal, have proposed an explanation for its generation mechanism, and have suggested a potential new use of CTS as an edge diagnostic.
Author:
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ISBN:
Category :
Languages : en
Pages : 7
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There is a flurry of activity to complete alpha-particle diagnostics so that they can undergo some experimental testing in DT plasmas on JET or TFTR prior to implementation on ITER. Successful measurements of escaping charged fusion products have been made in DD plasmas, and the [alpha]-particle source can be well characterized by neutron profile measurement. These methods can be extrapolated to DT plasmas. Measurement of the confined [alpha]-particles requires a new technique. Collective Thomson scattering, methods involving charge-exchange interactions and nuclear reactions with impurities will be discussed. Some assessment is given of the capabilities of these techniques, bearing in mind the potential for their use in the physics phase of the ITER program.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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A collective Thomson scattering (CTS) diagnostic system for localized measurement of energetic ions is being developed for TFTR. This system will use a 200KW, 56GHz gyrotron and a sensitive heterodyne receiver. In addition, a key element of this system will be beam and viewing dumps which are needed to minimize detection of stray gyrotron and ECE background radiation by the receiver system. It is the purpose of this study to determine the size and location of these dumps inside TFTR taking into account beam refraction and launch and receiver antenna optics scanning. The beam dump must cover all the area in the vacuum chamber where the beam is expected to impinge, and the viewing dump must cover all the areas within the direct line of sight of the receiver antenna. The beam launch system and the receiver antenna are to be placed nearly symmetrically above and below the midplane of the tokamak vacuum vessel, respectively. The beam dump is to be placed at the bottom inside of the vacuum vessel to absorb the gyrotron beam which will be launched from a top port. The viewing dump is expected to be placed symmetrically at the top inside of the vacuum vessel, and therefore a detailed analysis of only the beam dump is required here. 5 refs., 7 figs., 1 tab.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 820
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Author:
Publisher:
ISBN:
Category : Fusion reactors
Languages : en
Pages : 282
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Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 100
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