The effect of radiative slowing down on current drive by electron cyclotron radiation in fusion plasmas

1995 ◽  
Vol 35 (5) ◽  
pp. 613-617 ◽  
Author(s):  
M Bornatici ◽  
U Ruffina
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Fusion Plasmas ◽  
Slowing Down ◽  
Cyclotron Radiation

scholarly journals Assessment of ECH stray radiation levels at the W7-X Michelson Interferometer and Profile Reflectometer

2019 ◽  
Vol 203 ◽  
pp. 03010
Author(s):  
Johan. W. Oosterbeek ◽  
Neha Chaudhary ◽  
Matthias Hirsch ◽  
Udo Höfel ◽  
Robert. C. Wolf ◽  
...  
Keyword(s):  
Broad Band ◽  
Michelson Interferometer ◽  
Notch Filter ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Fusion Plasmas ◽  
High Power Microwaves ◽  
Stray Radiation ◽  
Cyclotron Emission ◽  
And Control

Electron Cyclotron Heating and Electron Cyclotron Current Drive are key components for heating and control in magnetically confined fusion plasmas. The high power microwaves are not always completely absorbed leading to stray radiation [1], [2]. At W7-X, the total injected microwave power can be up to 7.5 MW @140 GHz while the entire Electron Cyclotron Emission picked-up by an observer at the edge of the plasma is a fraction of a mW. In the situation of a Michelson Interferometer, the principle measurement is the entire ECE spectrum. Thus, any stray radiation is bound to enter the spectrum. In this work initial stray radiation measurements without filters at the location of two microwave receivers -the Michelson Interferometer and the Profile Reflectometer -are discussed. The data is used to dimension a notch filter to be used with the broad band Michelson Interferometer.

scholarly journals ECRad: An electron cyclotron radiation transport solver for advanced data analysis in thermal and non-thermal fusion plasmas

2020 ◽  
Vol 253 ◽  
pp. 107175
Author(s):  
S.S. Denk ◽  
R. Fischer ◽  
E. Poli ◽  
O. Maj ◽  
S.K. Nielsen ◽  
...  
Keyword(s):  
Data Analysis ◽  
Radiation Transport ◽  
Electron Cyclotron ◽  
Fusion Plasmas ◽  
Cyclotron Radiation

scholarly journals Simulating the impact of charge exchange on beam ions in MAST-U

2022 ◽  
Author(s):  
Patrik Ollus ◽  
Robert James Akers ◽  
Bethany Colling ◽  
Hana El-Haroun ◽  
David Keeling ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Plasma Heating ◽  
Current Drive ◽  
Beam Power ◽  
Fusion Plasmas ◽  
Vacuum Vessel ◽  
Noticeable Increase ◽  
Slowing Down ◽  
Fast Ions ◽  
The Impact

Abstract A model for simulating charge exchange (CX) of fast ions with background atoms in magnetically confined fusion plasmas has been implemented in the ASCOT orbit-following code. The model was verified by comparing simulated reaction mean free paths to analytical values across a range of fusion-relevant parameters. ASCOT was used to simulate beam ions slowing down in the presence of CX reactions in a MAST-U target scenario. ASCOT predicts the CX-induced loss of beam power to be 22%, which agrees to within 15% with the TRANSP prediction. Because of CX, plasma heating and current drive by beam ions are strongly reduced towards the edge. However, an overall lower but noticeable increase of up to 20% in current drive is predicted closer to the core. The simulated deposition of fast CX atoms on the wall is concentrated around the outer midplane, with estimated peak power loads of 70–80 kWm-2 on the central poloidal field coils (P5) and the vacuum vessel wall between them. This analysis demonstrates that ASCOT can be used to simulate fast ions in fusion plasmas where CX reactions play a significant role, e.g., in spherical tokamaks and stellarators.

Electron Cyclotron Radiation, Related Power Loss, and Passive Current Drive in Tokamaks: A Review

2001 ◽  
Vol 39 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Ignazio Fidone ◽  
Gerardo Giruzzi ◽  
Giovanni Granata
Keyword(s):  
Power Loss ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Cyclotron Radiation ◽  
Passive Current

Electron cyclotron current drive by radial transport of particles in a tokamak

1989 ◽  
Author(s):  
Sanghyun Park ◽  
Robert J. Taylor
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Radial Transport

scholarly journals Suppression of neoclassical tearing mode instability at the initial stage by electron cyclotron current drive

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035212
Author(s):  
Zhen Yang ◽  
Bin Wu ◽  
Yuanlai Xie ◽  
Yuqing Chen ◽  
Hongming Zhang ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Mode Instability ◽  
Initial Stage ◽  
Neoclassical Tearing Mode

scholarly journals Dispersion and damping of ion acoustic wave in deuterium–tritium fusion plasmas with slowing-down distributed α particles

AIP Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 055112
Author(s):  
F. F. Lu ◽  
S. Q. Liu
Keyword(s):  
Acoustic Wave ◽  
Fusion Plasmas ◽  
Ion Acoustic Wave ◽  
Slowing Down ◽  
Ion Acoustic ◽  
Α Particles
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