Abstract
A neutral particle bolometer (NPB) has been designed and implemented on Tri Alpha Energy's C-2 device in order to spatially and temporally resolve the charge-exchange losses of fast-ion populations originating from neutral beam injection into field-reversed configuration plasmas. This instrument employs a silicon photodiode as the detection device with an integrated tungsten filter coating to reduce sensitivity to light radiation. Here we discuss the technical aspects and calibration of the NPB, and report typical NPB measurement results of wall recycling effects on fast-ion losses.
Highlights
Up to six neutral beams (E = 20 keV, 40 A, each) are used to inject fast ions confined in betatron orbits near the separatrix
Fast ions in field-reversed configuration (FRC) are highly non-local since the betatron orbits extend from inside the field null to outside the separatrix, sampling large changes in neutral density, plasma density, and magnetic field
We have designed a neutral particle bolometer (NPB) to measure fast-neutral flux resulting from charge-exchanged fast ions
Summary
Up to six neutral beams (E = 20 keV, 40 A, each) are used to inject fast ions confined in betatron (axisencircling) orbits near the separatrix Such ions are predicted to improve FRC stability and transport.. Fast ions in FRCs are highly non-local since the betatron orbits extend from inside the field null to outside the separatrix, sampling large changes in neutral density, plasma density, and magnetic field. This results in rich fast-ion dynamics and motivates a spatially and temporally resolved study of fast-ion transport, charge-exchange losses. Photodiodes have been used in current mode to infer fast-neutral bolometry. In this paper we report direct measurements of fast-neutral flux using a photodiode in current mode
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