Investigation of a transient energetic charge exchange flux enhancement (‘spike-on-tail’) observed in neutral-beam-heated H-mode discharges in the National Spherical Torus Experiment

2011 ◽  
Vol 52 (1) ◽  
pp. 013014 ◽  
Author(s):  
S.S. Medley ◽  
Ya.I. Kolesnichenko ◽  
Yu.V. Yakovenko ◽  
R.E. Bell ◽  
A. Bortolon ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Neutral Beam ◽  
Spherical Torus ◽  
Flux Enhancement ◽  
Energetic Charge ◽  
Exchange Flux

Measurement of the fast ion distribution using active NPA diagnostics at the Globus-M2 spherical tokamak

2021 ◽  
Author(s):  
Nikolai Nikolaevich Bakharev ◽  
I M Balachenkov ◽  
F V Chernyshev ◽  
Vasily K Gusev ◽  
Evgeniy Kiselev ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Neutral Beam ◽  
Scanning System ◽  
Spatial Distributions ◽  
Spherical Tokamak ◽  
Ion Distribution ◽  
Fast Ion ◽  
Additional Charge

Abstract Active NPA measurements of the fast ion distribution using the neutral beam as an additional charge exchange target are discussed. Expressions for the calculation of the NPA signal based on the fast ion distribution and for the reconstruction of the fast ion distribution from the NPA signal are provided. Demonstration of the described approach is carried out on the Globus-M2 spherical tokamak, where a scanning system for the NPAs was recently installed. Main features of the active NPA application on Globus-M2 are considered. The energy and spatial distributions of fast deuterium ions at dedicated pitch angles are obtained and compared with the calculated ones. Key traits of the obtained distributions are considered and explained.

Spatially resolved charge exchange flux calculations on the Toroidal Pumped Limiter of Tore Supra

2009 ◽  
Vol 390-391 ◽  
pp. 482-485 ◽  
Author(s):  
Y. Marandet ◽  
E. Tsitrone ◽  
P. Börner ◽  
D. Reiter ◽  
A. Beauté ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Spatially Resolved ◽  
Exchange Flux

scholarly journals Observation of Compressional Alfvén Modes During Neutral-Beam Heating on the National Spherical Torus Experiment

2001 ◽  
Vol 87 (14) ◽  
Author(s):  
E. D. Fredrickson ◽  
N. Gorelenkov ◽  
C. Z. Cheng ◽  
R. Bell ◽  
D. Darrow ◽  
...  
Keyword(s):  
Neutral Beam ◽  
Spherical Torus ◽  
Beam Heating

scholarly journals Observation of Beam Driven Modes during Neutral Beam Heating on the National Spherical Torus Experiment

2001 ◽  
Author(s):  
E.D. Fredrickson ◽  
N. Gorelenkov ◽  
C.Z. Cheng ◽  
R. Bell ◽  
D. Darrow ◽  
...  
Keyword(s):  
Neutral Beam ◽  
Spherical Torus ◽  
Beam Heating
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