First results from the LIDAR Thomson Scattering System on JET

Salzmann, H.; Hirsch, K.; Nielsen, P.; Gowers, C.; Gadd, A. J.; Gadeberg, M.; Mürmann, H.; Schrödter, Ch.

doi:10.1088/0029-5515/27/11/017

Cited by 47 publications

(14 citation statements)

References 3 publications

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“…ii) The electron density profile in JET plasmas is measured by two diagnostics, namely the LIDAR Thomson scattering system [17] (providing ne at 50 points along a horizontal chord) and the far-infrared interferometer [18]. The latter measures the fine-integrated electron density along 6 chords, which is inverted with a generalized Abel inversion of the type described in sect.…”

Section: F(p ~) = F G(r O) DL L(p~)mentioning

confidence: 99%

“…The two ion temperature measurements appear to give overall similar results, apart from the uncertainties in the radial position of the profile points. In the latter example, the Te profile from LIDAR Thomson scattering measurements [17] is also available; the outward shift of this profile is less pronounced compared to the Te profile from ECE. This suggests that the relative shifts between the profiles are probably to be attributed to errors in the measurements.…”

Section: = (Dln Td/dr)/(dln Nd/dr )mentioning

confidence: 99%

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Determination of the deuterium temperature profile in magnetic fusion plasmas

Gorini¹,

Gottardi

1991

Il Nuovo Cimento D

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Summary. --A new experimental method for determining the radial deuterium temperature profile TD (R) in axisymmetrical toroidal fusion plasmas is presented. The method is based on a generalized Abel inversion of neutron brightness data providing the radial neutron emissivity profile of the plasma. This profile, combined with information on the deuterium density profile, is used to determine TD (R) under the assumption that the ion velocity distribution is Maxwellian. Results are presented here from the analysis of JET data. It is found that, for typical JET plasma conditions, the dominant source of uncertainty arises from the high plasma impurity level and the fact that it is poorly known; these problems can be expected to be remedied and neutron brightness measurements would be expected to be very effective (especially in high-density plasmas) as a TD (R) diagnostics. PACS 52.70.Nc -Particle measurements. PACS 52.25.Tx -Emission, absorption, and scattering of particles. -I n t r o d u c t i o n .As magnetically confined plasmas achieve conditions approaching ignition, higher fusion rates are obtained and new neutron diagnostic measurements become possible. The J E T machine is an example of such plasma physics experiments allowing for new neutron diagnostics to be tested. These measurements are at present in many respects a complement to other diagnostic data. However, future experiments using D-T plasmas are expected to depend critically on neutron-based information, and better neutron measurements are also being proposed which take full advantage of the expected high fusion rates [1]. It is, therefore, of interest to discuss in some detail what kind of information one can deduce from fusion neutron measurements. This can be done by studying the data from present experiments. An example of such new data comes from measurements of the line-integrated neutron emissivity of the plasma, i.e. the neutron brightness. The purpose of this paper is to present a new experimental 319

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Section: F(p ~) = F G(r O) DL L(p~)mentioning

confidence: 99%

Section: = (Dln Td/dr)/(dln Nd/dr )mentioning

confidence: 99%

Determination of the deuterium temperature profile in magnetic fusion plasmas

Gorini¹,

Gottardi

1991

Il Nuovo Cimento D

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“…A second important advance was the use of a high-repetition rate YAG laser at Garching, Roehr et al [10], which permitted data to be obtained at 100 Hz or more. This laser plays an important role in measurements on industrial plasmas.…”

Section: Introduction An Updated Version Of Plasma Scattering Of Elecmentioning

confidence: 99%

Updating Plasma Scattering of Electromagnetic Radiation

Sheffield¹

2010

J. Phys.: Conf. Ser.

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“…Razdobarin, A.A. Besshaposhnikov, L.N. Pjatnitsky et al [2,3] applied the Thomson scattering method in various facilities for diagnostics of the low-temperature and the fusion plasma. Since then this method has been permanently developed; in particular this concerns radiation sources and their components.…”

Section: Introductionmentioning

confidence: 99%

Source of radiation for diagnostics of the divertor plasma on the ITER facility

Glukhikh

Kurunov

Смирнов

et al. 2008

Plasma Devices and Operations

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An optical scheme of a diode-pumped, two-channel, solid-state laser is considered. The scheme is destined for diagnostics of the physical processes occurring in the divertor area of the tokamak-type fusion facilities by the method of Thomson scattering and has been developed on the basis of modern engineering and technological advancements made in powerful pulse-periodic laser systems. The schemes for the laser diode pumping of the active elements are considered, and the results of thermal and hydraulic calculations of a pumping module are presented. The results of the energy calculation confirm the feasibility of a laser system with technical parameters meeting the requirements of a task assigned.

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First results from the LIDAR Thomson Scattering System on JET

Cited by 47 publications

References 3 publications

Determination of the deuterium temperature profile in magnetic fusion plasmas

Determination of the deuterium temperature profile in magnetic fusion plasmas

Updating Plasma Scattering of Electromagnetic Radiation

Source of radiation for diagnostics of the divertor plasma on the ITER facility

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