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

Alexander N. Karpushov; Yanis Andrebe; Basil P. Duval; Alessandro Bortolon

doi:10.1016/j.fusengdes.2008.12.006

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

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

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 H_α emission, thermal measurements on a movable calorimeter and visible optical measurements inside the Tokamak vessel.

Original language	English (US)
Pages (from-to)	993-997
Number of pages	5
Journal	Fusion Engineering and Design
Volume	84
Issue number	2-6
DOIs	https://doi.org/10.1016/j.fusengdes.2008.12.006
State	Published - Jun 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Nuclear Energy and Engineering
General Materials Science
Mechanical Engineering

Keywords

Charge exchange recombination spectroscopy
Diagnostic neutral beam injector
TCV Tokamak

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10.1016/j.fusengdes.2008.12.006

Cite this

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title = "The diagnostic neutral beam injector with arc-discharge plasma source on the TCV Tokamak",

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.",

keywords = "Charge exchange recombination spectroscopy, Diagnostic neutral beam injector, TCV Tokamak",

author = "Karpushov, \{Alexander N.\} and Yanis Andrebe and Duval, \{Basil P.\} and Alessandro Bortolon",

year = "2009",

month = jun,

doi = "10.1016/j.fusengdes.2008.12.006",

language = "English (US)",

volume = "84",

pages = "993--997",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

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AU - Karpushov, Alexander N.

AU - Andrebe, Yanis

AU - Duval, Basil P.

AU - Bortolon, Alessandro

PY - 2009/6

Y1 - 2009/6

N2 - 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.

AB - 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.

KW - Charge exchange recombination spectroscopy

KW - Diagnostic neutral beam injector

KW - TCV Tokamak

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JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

IS - 2-6

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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