Schematic of a cross section of the C-2 device with a typical fast ion orbit and NPA view cord orientation.
Radial profiles of the neutral beam density (calculated) and residual gas density (inferred from measurements).
Neutral beam voltage and current modulated at 22 kHz.
Schematic of the electrostatic neutral particle analyzer.
Time evolution of the separatrix radius (a) and hydrogen beam shine-through (b).
NPA signal in the 16 keV channel (ΔE = ±0.8 keV) (black line – total neutral flux, blue line – contribution due to CX on the residual gas only, red line – contribution due to CX on the target beam).
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