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3 results on '"Diagnostic neutral beam injector"'

1. The diagnostic neutral beam injector with arc-discharge plasma source on the TCV Tokamak

Author

Karpushov, Alexander N., Andrebe, Yanis, Duval, Basil P., and Bortolon, Alessandro

Subjects
*INJECTORS, *NEUTRAL beams, *GLOW discharges, *ION sources, *TOKAMAKS, *IONIZING radiation, *PLASMA generators, *RADIO frequency
Abstract

Abstract: The diagnostic neutral beam injector (DNBI) together with a charge exchange recombination spectroscopy (CXRS) system has been used on the TCV Tokamak as a diagnostic tool for local measurements of plasma ion temperature, velocity and carbon impurity density based on analysis of the beam induced impurity radiation emission since 2000. To improve the performance of the CXRS diagnostic, several upgrades of both the optical system and the neutral beam were performed. An increase of the plasma source size together with beam optimization in 2003 resulted in a twofold increase the beam current. The RF plasma generator was replaced by an arc-discharge plasma source together with a new ion optical system (IOS) in 2006 and subsequent beam optimization is presented herein. This was designed to increase the line brightness of the beam in the CXRS observation region without increasing of the injected power (to avoid plasma perturbation by the beam). The beam characteristics are measured by a multi-chord scanning of Doppler-shifted emission, thermal measurements on a movable calorimeter and visible optical measurements inside the Tokamak vessel. [Copyright &y& Elsevier]

Published
2009
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2. Upgrade of the diagnostic neutral beam injector for the TCV tokamak

Author

Karpushov, Alexander N., Abdrashitov, G.F., Averboukh, I.I., Bosshard, P., Condrea, I., Duval, B.P., Ivanov, A.A., Kolmogorov, V.V., Mlynar, J., Perez, A., Shikhovtsev, I.V., Shukaev, A.N., and Weisen, H.

Subjects
*NEUTRAL beams, *TOKAMAKS, *SPECTRUM analysis, *CHARGE transfer
Abstract

A diagnostic neutral beam injector (DNBI) [CRPP report LRP 710/01, CRPP-EPFL, 2001; EPS Conf. Contr. Fusion Plasma Phys., 25A (2001) 365] has been installed on tokamak à configuration variable (TCV) [Plasma Phys. Control Fusion, 36 (1994) B277; Plasma Phys. Control Fusion, 43 (2001) A161; Plasma Phys. Control Fusion, to be published] for the purpose of providing local measurements of plasma ion temperature, velocity and impurity density by Charge eXchange recombination spectroscopy (CXRS) [EPS Conf. Contr. Fusion Plasma Phys., 25A (2001) 365]. The system recently underwent a technical upgrade, which allowed to increase the full neutral beam current density by a factor of two (from 0.5 to 1 A at 52 keV injection energy) and to extend the operational range of the diagnostic. This was achieved by means of a new, larger ion source, with an increased extraction area and corresponding enhancements of the power supplies. [Copyright &y& Elsevier]

Published
2003
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3. The diagnostic neutral beam injector with arc-discharge plasma source on the TCV Tokamak

Author

A. N. Karpushov, Alessandro Bortolon, B. P. Duval, Y. Andrebe, and Zohm, H.

Subjects
Tokamak, Materials science, Diagnostic neutral beam injector, Mechanical Engineering, TCV Tokamak, Plasma, Fusion power, Temperature measurement, Charge, law.invention, Ion, Electric arc, Nuclear Energy and Engineering, law, Physics::Plasma Physics, exchange recombination spectroscopy, Physics::Accelerator Physics, General Materials Science, Electric current, Atomic physics, Spectroscopy, Civil and Structural Engineering
Abstract

The diagnostic neutral beam injector (DNBI) together with a charge exchange recombination spectroscopy (CXRS) system has been used on the TCV Tokamak as a diagnostic tool for local measurements of plasma ion temperature, velocity and carbon impurity density based on analysis of the beam induced impurity radiation emission since 2000. To improve the performance of the CXRS diagnostic, several upgrades of both the optical system and the neutral beam were performed. An increase of the plasma source size together with beam optimization in 2003 resulted in a twofold increase the beam current. The RF plasma generator was replaced by an arc-discharge plasma source together with a new ion optical system (IOS) in 2006 and subsequent beam optimization is presented herein. This was designed to increase the line brightness of the beam in the CXRS observation region without increasing of the injected power (to avoid plasma perturbation by the beam). The beam characteristics are measured by a multi-chord scanning of Doppler-shifted Hα emission, thermal measurements on a movable calorimeter and visible optical measurements inside the Tokamak vessel.

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