Determination of neutral‐beam‐power profiles: Divergences and power fractions of the species from measurements inside the torus of TEXTOR

1994 ◽  
Vol 65 (9) ◽  
pp. 2996-2999 ◽  
Author(s):  
H. Euringer ◽  
Ph. Verplancke
Keyword(s):  
Neutral Beam ◽  
Beam Power

Numerical analysis of the neutral beam attenuation rate on the HT-7 and EAST tokamaks

2008 ◽  
Vol 74 (1) ◽  
pp. 9-19 ◽  
Author(s):  
GUOPING ZHANG ◽  
LIQUN HU ◽  
XIANMEI ZHANG ◽  
JUAN HUANG ◽  
JIN LIU ◽  
...  
Keyword(s):  
Electron Density ◽  
Neutral Beam ◽  
Beam Power ◽  
Impurity Effect ◽  
Atomic Processes ◽  
Ion Temperature ◽  
Plasma Parameters ◽  
Beam Attenuation ◽  
Attenuation Rate ◽  
Temperature Electron

AbstractA diagnostic neutral beam (DNB) is applied to measure the plasma ion temperature and rotation speed in the HT-7 tokamak. Also, a heating neutral beam (HNB) is suggested as an effective method of heating a plasma for the EAST tokamak. As a necessary step to evaluate the required beam power in both applications, the attenuation of the injected neutral beam has been numerically calculated and analyzed considering the effect of various plasma parameters, such as electron temperature, electron density, impurity concentration, and so on. Three basic atomic processes are considered here. It is shown that at the same electron density neutral beam particles can penetrate deeper at higher injection energies and a DNB with the same full energy can attenuate faster at higher electron densities. The impurity effect on the attenuation of a DNB is discussed, and the attenuation of a HNB on the EAST tokamak is also considered.

scholarly journals Photon flux determination of a liquid-metal jet X-ray source by means of photon scattering

2019 ◽  
Vol 34 (7) ◽  
pp. 1497-1502 ◽  
Author(s):  
Malte Wansleben ◽  
Claudia Zech ◽  
Cornelia Streeck ◽  
Jan Weser ◽  
Christoph Genzel ◽  
...  
Keyword(s):  
Electron Beam ◽  
Liquid Metal ◽  
Power Density ◽  
Photon Flux ◽  
Beam Power ◽  
Photon Scattering ◽  
X Ray ◽  
Metal Anode ◽  
Metal Jet

Liquid-metal jet X-ray sources promise to deliver high photon fluxes, which are unprecedented for laboratory based X-ray sources, because the regenerating liquid-metal anode is less sensitive to damage caused by an increased electron beam power density.

scholarly journals Energy composition of high-energy neutral beams on the COMPASS tokamak

Nukleonika ◽  
2016 ◽  
Vol 61 (4) ◽  
pp. 419-423
Author(s):  
Klara Mitosinkova ◽  
Jan Stöckel ◽  
Jozef Varju ◽  
Vladimir Weinzettl
Keyword(s):  
Plasma Heating ◽  
High Energy ◽  
Ion Source ◽  
Neutral Beam ◽  
Beam Power ◽  
Neutral Beams ◽  
Before And After ◽  
Copper Shield ◽  
Single Aperture ◽  
Energy Components

Abstract The COMPASS tokamak is equipped with two identical neutral beam injectors (NBI) for additional plasma heating. They provide a beam of deuterium atoms with a power of up to ~(2 × 300) kW. We show that the neutral beam is not monoenergetic but contains several energy components. An accurate knowledge of the neutral beam power in each individual energy component is essential for a detailed description of the beam- -plasma interaction and better understanding of the NBI heating processes in the COMPASS tokamak. This paper describes the determination of individual energy components in the neutral beam from intensities of the Doppler-shifted Dα lines, which are measured by a high-resolution spectrometer viewing the neutral beam-line at the exit of NBI. Furthermore, the divergence of beamlets escaping single aperture of the last accelerating grid is deduced from the width of the Doppler-shifted lines. Recently, one of the NBI systems was modified by the removal of the Faraday copper shield from the ion source. The comparison of the beam composition and the beamlet divergence before and after this modification is also presented.

Real time neutral beam power control on MAST

2011 ◽  
Vol 86 (6-8) ◽  
pp. 780-784 ◽  
Author(s):  
David A. Homfray ◽  
A. Benn ◽  
D. Ciric ◽  
I. Day ◽  
V. Dunkley ◽  
...  
Keyword(s):  
Power Control ◽  
Real Time ◽  
Neutral Beam ◽  
Beam Power
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