A multipoint Thomson scattering diagnostic for the tokamak ISTTOK

Alonso, M. P.; Wilcock, P.; Varandas, C.

doi:10.1063/1.1149401

Cited by 11 publications

(10 citation statements)

References 10 publications

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“…7 The TSD uses a neodymium:glass laser with up to 10 J per laser pulse and a first generation polychromator with three pairs of interference filters and avalanche photodiodes ͑Fig. 3͒.…”

Section: Temperature Measurement Using the Thomson Scattering DImentioning

confidence: 99%

Comparative electron temperature measurements of Thomson scattering and electron cyclotron emission diagnostics in TCABR plasmas

Alonso¹,

Figueiredo²,

Borges

et al. 2010

Review of Scientific Instruments

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A fast multichannel Martin-Puplett interferometer for electron cyclotron emission measurements on JET Rev. Sci. Instrum. 82, 113506 (2011) Absolute intensity calibration of flat-field space-resolved extreme ultraviolet spectrometer using radial profiles of visible and extreme ultraviolet bremsstrahlung continuum emitted from high-density plasmas in Large Helical Device Rev. Sci. Instrum. 82, 113102 (2011) Analysis of indium zinc oxide thin films by laser-induced breakdown spectroscopy J. Appl. Phys. 110, 083116 (2011) A line-imaging velocity interferometer technique for shock diagnostics without x-ray preheat limitation Rev. Sci. Instrum. 82, 103108 (2011) Production of neutrons up to 18 MeV in high-intensity, short-pulse laser matter interactions Phys. Plasmas 18, 100703 (2011) Additional information on Rev. Sci. Instrum. We present the first simultaneous measurements of the Thomson scattering and electron cyclotron emission radiometer diagnostics performed at TCABR tokamak with Alfvén wave heating. The Thomson scattering diagnostic is an upgraded version of the one previously installed at the ISTTOK tokamak, while the electron cyclotron emission radiometer employs a heterodyne sweeping radiometer. For purely Ohmic discharges, the electron temperature measurements from both diagnostics are in good agreement. Additional Alfvén wave heating does not affect the capability of the Thomson scattering diagnostic to measure the instantaneous electron temperature, whereas measurements from the electron cyclotron emission radiometer become underestimates of the actual temperature values.

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“…7 The TSD uses a neodymium:glass laser with up to 10 J per laser pulse and a first generation polychromator with three pairs of interference filters and avalanche photodiodes ͑Fig. 3͒.…”

Section: Temperature Measurement Using the Thomson Scattering DImentioning

confidence: 99%

Comparative electron temperature measurements of Thomson scattering and electron cyclotron emission diagnostics in TCABR plasmas

Alonso¹,

Figueiredo²,

Borges

et al. 2010

Review of Scientific Instruments

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“…The time-of-flight of laser light was used for the first time by the LIDAR Thomson system for the purpose of realizing one-dimensional Thomson scattering measurement system through a small viewing port [5]. Recently, optical fibers were used to produce sufficient time delay for scattered light signals as a way of reducing the required numbers of detectors [6].The first 2-D TS measurement has been realized on ASDEX Upgrade [7], using five high-cost Nd:YAG laser devices. For the TS-4 device whose main mission is merging ST plasmas and their magnetic reconnection, the 2-D profile of T e and n e are keys to understanding the causes and mechanism for (1) the electron heating of the magnetic reconnection and (2) high-β ST formation at merging start-up.…”

Section: Introductionmentioning

confidence: 99%

Development of 2-D Thomson Scattering Measurement Using Multiple Reflection and the Time-of-Flight of Laser Light

Sumikawa

Yamashita

Kawamori

et al. 2007

Plasma and Fusion Research

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A new two-dimensional Thomson scattering measurement (2-D TS) system has been developed using multiple reflections and time-of-flight (TOF) of laser light. Its new ideas of our 2-D TS system are (1) to reflect YAG laser light for multiple times to cover the whole r − z plane of the ST (Spherical Tokamak) plasma, and (2) to reduce the number of polychromators and detectors using the time delay of the scattered light along the laser beam. We measured for the first time, Rayleigh scattering light signals with 50 ns time difference from two measurement points using a single detector, demonstrating the basic principle of the 2-D Thomson scattering system.

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“…TS is a well-established diagnostic tool for measuring local plasma temperature and density in fusion research experiments with spatial and temporal resolutions. [3][4][5][6][7] This technique is particularly difficult to implement due to the extremely low signals to be detected which can be easily masked by the laser stray light as well as the plasma background radiation. In this work, the main features and the first results of the TS diagnostic of ETE plasma are presented.…”

Section: Introductionmentioning

confidence: 99%

Thomson scattering system for the diagnosis of the ETE spherical tokamak plasma

Berni

Ueda

Bosco

et al. 2003

Review of Scientific Instruments

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A 10 J ruby laser Thomson scattering system was implemented on the ETE spherical tokamak to measure the density n e and temperature T e profiles. The laser probes the plasma at the horizontal midplane of the torus and the collection optics allows the observation of up to 22 points inside the plasma in the same plane. Radial profiles of plasma density and electron temperature were obtained for different times during the discharge by shot-to-shot procedure. Temperatures of up to 160 eV and densities of 2.2ϫ10 19 m Ϫ3 were measured. Since the level of stray light was too high, the calibration of the Thomson scattering system for density measurements was made using the nitrogen Raman technique instead of the usually applied Rayleigh method.

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A multipoint Thomson scattering diagnostic for the tokamak ISTTOK

Cited by 11 publications

References 10 publications

Comparative electron temperature measurements of Thomson scattering and electron cyclotron emission diagnostics in TCABR plasmas

Comparative electron temperature measurements of Thomson scattering and electron cyclotron emission diagnostics in TCABR plasmas

Development of 2-D Thomson Scattering Measurement Using Multiple Reflection and the Time-of-Flight of Laser Light

Thomson scattering system for the diagnosis of the ETE spherical tokamak plasma

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