scholarly journals Model-based real-time plasma electron density profile estimation and control on ASDEX Upgrade and TCV

2019 ◽  
Vol 147 ◽  
pp. 111211 ◽  
Author(s):  
T.C. Blanken ◽  
F. Felici ◽  
C. Galperti ◽  
O. Kudláček ◽  
F. Janky ◽  
...  
Keyword(s):  
Real Time ◽  
Electron Density ◽  
Density Profile ◽  
Plasma Electron ◽  
Electron Density Profile ◽  
Model Based ◽  
Estimation And Control ◽  
And Control ◽  
Profile Estimation ◽  
Plasma Electron Density

scholarly journals Model-based electron density profile estimation and control, applied to ITER

2021 ◽  
Author(s):  
Thomas Bosman ◽  
M van Berkel ◽  
Marco de Baar
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Density Profile ◽  
Thomson Scattering ◽  
Electron Density Profile ◽  
Dynamic State ◽  
Pellet Injection ◽  
Estimation And Control ◽  
And Control ◽  
Profile Estimation

Abstract In contemporary magnetic confinement devices, the density distribution is sensed with interferometers and actuated with feedback controlled gas injection and open-loop pellet injection. This is at variance with the density control for ITER and DEMO, that will depend mainly on pellet injection as an actuator in feed-back control. This paper presents recent developments in state estimation and control of the electron density profile for ITER using relevant sensors and actuators. As a first step, Thomson scattering is included in an existing dynamic state observer. Second, model predictive control is developed as a strategy to regulate the density profile while avoiding limits associated with the total density (Greenwald limit) or gradients in the density distribution (e.g. neo-classical impurity transport). Simulations show that high quality density profile estimation can be achieved with Thomson Scattering and that the controller is capable of regulating the distribution as desired.

Geometriefaktoren von Hohlraumresonatoren zur Elektronendichte-, Dichteprofil- und Stoßfrequenzmessung von Plasmen

1971 ◽  
Vol 26 (8) ◽  
pp. 1264-1271 ◽  
Author(s):  
G. Janzen
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Collision Frequency ◽  
Axial Direction ◽  
Plasma Electron ◽  
Electron Density Profile ◽  
Cavity Resonance ◽  
Cavity Resonators ◽  
Resonance Modes ◽  
Small Index

Geometry factors of cavity resonators for the determination of plasma electron density, density profile, and collision frequency Geometry factors of a number of cylindrical TEimn and TMimn cavity resonance modes are cal-culated as a function of the ratio of plasma and cavity radius and as a function of the radial electron density profile. In axial direction homogeneous and sinusoidal density profiles are assumed.Resonance modes with a small index l are suitable for the measurement of electron densities in narrow and dilute plasma columns; modes with an index l ≧ 2 are specially advantageous for measuring the density profile.Results of measurements of the electron density, density profile, and collision frequency in nitrogen are given.

scholarly journals GPS TEC and ITEC from digisonde data compared with NEQUICK model

2005 ◽  
Vol 2 ◽  
pp. 269-273 ◽  
Author(s):  
J.-C. Jodogne ◽  
H. Nebdi ◽  
R. Warnant
Keyword(s):  
Real Time ◽  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile ◽  
Ionospheric Model ◽  
Gps Receiver ◽  
Real Time Processing ◽  
Time Processing ◽  
Gps Tec ◽  
Royal Observatory

Abstract. At the Dourbes station, a digisonde 256 is colocated with a Turbo Rogue GPS receiver. Real time processing of the digisonde data gives the electron density profile and the ITEC value (SAO file) for each sounding. The GPS receiver produces data that are treated at the Royal Observatory in order to extract a vertical TEC. Running the wellknown NeQuick ionospheric model allows to compute vertical TEC values. Comparisons of the results obtained in 1996 and 2001 by these different approaches are shown.

scholarly journals Real-time ionospheric N(h) profile updating over Europe using IRI-2000 model

2005 ◽  
Vol 2 ◽  
pp. 299-303 ◽  
Author(s):  
D. Buresova ◽  
Lj. R. Cander ◽  
A. Vernon ◽  
B. Zolesi
Keyword(s):  
Real Time ◽  
Electron Density ◽  
Density Profile ◽  
Space Weather ◽  
Electron Density Profile ◽  
Ionospheric Model ◽  
Ionospheric Electron Density ◽  
European Area ◽  
Quiet Day ◽  
The Eu

Abstract. In this paper a method for real-time updating of ionospheric electron density profile, N(h), over Europe using an ionospheric model and real-time measurements at ionosonde locations is presented. The N(h) profile update over European area has been simulated with the IRI-2000 ionospheric model and real-time N(h) profiles obtained from the EU COST271 Action Space Weather Database. Preliminary findings are shown for the geomagnetically quiet day on 4 May 2003 and disturbed day on 24 May 2002. Results are discussed in the context of real-time N(h) profile updating capabilities and effectiveness.

The implementation of real-time plasma electron density calculations on EAST

2016 ◽  
Vol 112 ◽  
pp. 952-956 ◽  
Author(s):  
Z.C. Zhang ◽  
B.J. Xiao ◽  
F. Wang ◽  
H.Q. Liu ◽  
Q.P. Yuan ◽  
...  
Keyword(s):  
Real Time ◽  
Electron Density ◽  
Plasma Electron ◽  
Plasma Electron Density

scholarly journals Bestimmung des Elektronendichteprofils in Plasmen mit Hilfe von Hohlraumresonatoren / Determination of Plasma Electron Density Profiles by Means of Resonant Cavities

1969 ◽  
Vol 24 (10) ◽  
pp. 1496-1501
Author(s):  
G. Janzen
Keyword(s):  
Electron Density ◽  
Cavity Mode ◽  
Plasma Electron ◽  
Electron Density Profile ◽  
Density Profiles ◽  
Resonant Cavities ◽  
Microwave Cavities ◽  
Electron Density Profiles ◽  
Plasma Electron Density

Abstract The shift of the resonant frequency of microwave cavities excited in TM0m0 (m=1, 2, 3), TMl10 (l=1, 2), TE01n (n>0 integer) modes under the influence of a plasma is calculated for arbitrary radii of plasma and cavity for Bessel profile and common parabolic profiles.In measuring the frequency shift for two of the cited cavity mode types an approximate electron density profile can be determined from the submitted diagrams.

Research on the Real-Time Phase Jump Process Method for Plasma Electron Density Measurement in HL-2A Tokamak

2015 ◽  
Vol 17 (10) ◽  
pp. 837-841 ◽  
Author(s):  
Baogang Ding ◽  
Chao Chen ◽  
Wendi Wang ◽  
Tongyu Wu ◽  
Yan Zhou ◽  
...  
Keyword(s):  
Real Time ◽  
Electron Density ◽  
Density Measurement ◽  
Jump Process ◽  
Plasma Electron ◽  
Phase Jump ◽  
The Real ◽  
Plasma Electron Density ◽  
Process Method
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