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Doppler spectroscopy and D-alpha emission diagnostics for the C-2 FRC plasma

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15 Author(s)
Gupta, Deepak K. ; Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688, USA ; Paganini, E. ; Balvis, A. ; Bonelli, L.
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Two Doppler spectroscopy diagnostics with complementary capabilities are developed to measure the ion temperatures and velocities of FRC plasmas in the C-2 device. First, the multichord ion doppler diagnostic can simultaneously measure 15 chords of the plasma using an image intensified camera. Second, a single-chord fast-response ion Doppler diagnostic provides much higher faster time response by using a 16-channel photo-multiplier tube array. To study the neutral density of deuterium under different wall and plasma conditions, a highly sensitive eight-channel D-alpha diagnostic has been developed and calibrated for absolute radiance measurements. These spectroscopic diagnostics capabilities, combined with other plasma diagnostics, are helping to understand and improve the field reversed configuration plasmas in the C-2 device.

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Review of Scientific Instruments  (Volume:81 ,  Issue: 10 )