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Characterisation of target plasma required for REB-plasma interaction studies using cylindrical Langmuir probes

P Roychowdhury, A S Paithankar, S K Iyyengar, V K Rohatgi1987年Plasma Physics and Controlled FusionIF 2.2出版社

The target plasma required for relativistic electron beam (REB)-plasma interaction studies has been generated by a coaxial plasma gun. The measurement of electron density and temperature has been carried out using cylindrical Langmuir probes. Probes both oriented parallel and transverse to the flow have been used. The spatial as well as temporal variation of electron density and temperature have been studied. The typical electron density and temperature measured by probe were in the range of 9.0-3.5*1013 cm-3 and 5-7 eV respectively. The typical e-folding decay time of density was 6.2 mu s, while no appreciable change in electron temperature was observed until 10 mu s after the peak density. The density decays by about 50% at distance of 30 cm from the gun. The plasma flow velocity has been measured by the time of flight technique and was found to be 2.5*106 cm s-1. The plasma radius measured by dosimeter film, at distance of 30 cm from the gun was 3 cm.

日本語訳

相対論的電子ビーム(REB)とプラズマの相互作用研究に必要なターゲットプラズマは、同軸プラズマガンによって生成された。電子密度と温度の測定は、円筒型ラングミュアプローブを用いて行われた。プローブは、流れに平行および垂直の両方の向きで使用された。電子密度と温度の空間的および時間的変化の両方が研究された。プローブによって測定された典型的な電子密度と温度は、それぞれ9.0×10¹³ cm⁻³および5〜7 eVの範囲であった。密度の典型的なe-folding減衰時間は6.2μsであり、一方、密度のピーク後10μsまでは電子温度の顕著な変化は観測されなかった。密度は、ガンから30 cmの距離で約50%減衰する。プラズマ流速度は、飛行時間法によって測定され、2.5×10⁶ cm s⁻¹であることが判明した。ガンから30 cmの距離における、線量計フィルムによって測定されたプラズマ半径は3 cmであった。

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