Diagnostic neutral beam (DNB), combined with spectral diagnostics, is employedto measure the ion temperature in HT-7. The factors affecting the extracted beam are studied inthe experiment for the high performance diagnostic neutral beam. A 6.5 A extracted hydrogencurrent at 43 keV of 100 ms was obtained after optimization. The extracted beam has a protonratio as high as 40%, and can penetrate into the core plasma after neutralization to measure theion temperature effectively.
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