Ion cyclotron emission diagnostic system on the experimental advanced superconducting tokamak and first detection of energetic-particle-driven radiation

2019 ◽  
Vol 90 (6) ◽  
pp. 063504 ◽  
Author(s):  
L. N. Liu ◽  
X. J. Zhang ◽  
Y. B. Zhu ◽  
C. M. Qin ◽  
Y. P. Zhao ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Diagnostic System ◽  
Ion Cyclotron ◽  
Cyclotron Emission ◽  
Superconducting Tokamak

Radio frequency measurements of energetic-particle-driven emission using the ion cyclotron emission diagnostic on the DIII-D tokamak

2018 ◽  
Vol 89 (10) ◽  
pp. 10I102 ◽  
Author(s):  
K. E. Thome ◽  
D. C. Pace ◽  
R. I. Pinsker ◽  
O. Meneghini ◽  
C. A. del Castillo ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Energetic Particle ◽  
Frequency Measurements ◽  
Ion Cyclotron ◽  
Cyclotron Emission

Upgrades to the ion cyclotron emission diagnostic on the DIII-D tokamak

2021 ◽  
Vol 92 (3) ◽  
pp. 033543
Author(s):  
G. H. DeGrandchamp ◽  
K. E. Thome ◽  
W. W. Heidbrink ◽  
I. Holmes ◽  
R. I. Pinsker
Keyword(s):  
Ion Cyclotron ◽  
Cyclotron Emission

scholarly journals Novel internal measurements of ion cyclotron frequency range fast-ion driven modes

2021 ◽  
Author(s):  
Neal A Crocker ◽  
Shawn X Tang ◽  
Kathreen E Thome ◽  
Jeff Lestz ◽  
Elena Belova ◽  
...  
Keyword(s):  
Cyclotron Frequency ◽  
Harmonic Wave ◽  
Wave Number ◽  
Frequency Range ◽  
High Wave Number ◽  
Minor Radius ◽  
Ion Cyclotron ◽  
Cyclotron Emission ◽  
Edge Localized Modes ◽  
Fast Ion

Abstract Novel internal measurements and analysis of ion cyclotron frequency range fast-ion driven modes in DIII-D are presented. Observations, including internal density fluctuation (ñ) measurements obtained via Doppler Backscattering, are presented for modes at low harmonics of the ion cyclotron frequency localized in the edge. The measurements indicate that these waves, identified as coherent Ion Cyclotron Emission (ICE), have high wave number, _⊥ρ_fast ≳ 1, consistent with the cyclotron harmonic wave branch of the magnetoacoustic cyclotron instability (MCI), or electrostatic instability mechanisms. Measurements show extended spatial structure (at least ~ 1/6 the minor radius). These edge ICE modes undergo amplitude modulation correlated with edge localized modes (ELM) that is qualitatively consistent with expectations for ELM-induced fast-ion transport.

Halo current diagnostic system of experimental advanced superconducting tokamak

2015 ◽  
Vol 86 (10) ◽  
pp. 103506 ◽  
Author(s):  
D. L. Chen ◽  
B. Shen ◽  
R. S. Granetz ◽  
Y. Sun ◽  
J. P. Qian ◽  
...  
Keyword(s):  
Diagnostic System ◽  
Superconducting Tokamak

scholarly journals Integration of an Electron Cyclotron Imaging diagnostic system on the WEST tokamak

2019 ◽  
Vol 203 ◽  
pp. 03011 ◽  
Author(s):  
Roland Sabot ◽  
Yoonbum Nam ◽  
Cyril Brun ◽  
Didier Elbèze ◽  
Frédéric Faisse ◽  
...  
Keyword(s):  
Optical System ◽  
Diagnostic System ◽  
First Trimester ◽  
Electron Cyclotron ◽  
The West ◽  
Low Field ◽  
Cyclotron Emission ◽  
Design Values ◽  
Long Pulse ◽  
Electron Cyclotron Emission Imaging

An Electron Cyclotron Emission Imaging (ECEI) diagnostic system for the WEST tokamak has been developed under the UNIST-WEST collaboration. This diagnostic system is designed to overcome accessibility and thermomechanical constraints for long pulse operation. The first O-mode channel will be installed in the first trimester of 2019 to probe the low field side (LFS) of the WEST plasma. Two large metallic reflective mirrors are installed inside the duct which is being used for maintenance access. They are suspended on a rail to facilitate mirror manipulation. The ex-vessel optical system (lens, detection array, etc.) is housed in a compact optical enclosure that fits in a tight free space between the port flange and tokamak access lobby. The design emphasized reproducibility of the precise alignment between in-vessel mirrors and optical enclosure since the both elements must be removed during shutdown period for maintenance access. The overall optical system was fully tested at UNIST last year. The test results demonstrated that the imaging optics can full access at any radial position on the LFS. The 2D beam pattern measurements were consistent with the design values.

Ion Cyclotron Emission — a Natural Diagnostic for Fusion Alpha Particles

1994 ◽  
Vol 25 (3) ◽  
pp. 334-340 ◽  
Author(s):  
Richard O. Dendy ◽  
Chris N. Lashmore-Davies ◽  
Geoff A. Cottrell ◽  
Kenneth G. McClements ◽  
Kin F. Kam
Keyword(s):  
Alpha Particles ◽  
Ion Cyclotron ◽  
Cyclotron Emission
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