Charge exchange radiation diagnostic with gas jet target for measurement of plasma flow velocity in the linear magnetic trap
نویسندگان
چکیده
The ambipolar electrostatic potential rising along the magnetic field line from grounded wall to centre in linear gas dynamic trap, rules available suppression of axial heat and particle losses. In this paper, visible range optical diagnostic is described using Doppler shift plasma emission lines for measurements accelerating drop. We used room temperature hydrogen jet puffed directly on sight as charge exchange target ions moving expanding flux mirror towards wall. Both bulk protons $He^{2+}$ velocity distribution functions can be spectroscopically studied; latter population produced via neutral He tracer puff into central cell plasma. This way, area measured simultaneously with ion temperature. A reasonable accuracy $4\div8\%$ was achieved observations frame rate $\approx 1~kHz$. Active acquisitions also provide spatial resolution better than 5~mm middle plane radial coordinate because strong compression object size when projected surface. radiation operates three lines: H-$\alpha$ 656.3~nm, He-I 667.8~nm 587.6~nm. Recorded spectra are shown paper examples physical dependences presented. considered experimental technique scaled upgraded multi-point next generation traps other confinement systems.
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ژورنال
عنوان ژورنال: Journal of Instrumentation
سال: 2021
ISSN: ['1748-0221']
DOI: https://doi.org/10.1088/1748-0221/16/05/p05018