Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 13: Low Pressure Plasmas - Poster

P 13.15: Poster

Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal

Production of a high-density plasma channel for laser acceleration — •Daiyu Hayashi¹ und Tatsuo Shoji² — ¹Philips Research Eindhoven, The Netherlands — ²Nagoya University, Japan

In the framework of IZEST laser acceleration program, we develop a long (50 cm) and narrow (a few mm) plasma channel with a hollow electron density profile by helicon-wave discharges. First, we generate high-density plasmas by Helicon wave discharges in a narrow glass tube, where a hollow neutral gas profile is formed due to neutral depletion. Thereafter high-intense laser radiation will be introduced into the plasma channel to ionize fully the neutral gas of the hollow profile. In this talk, we report on the generation of high-density plasmas of 10¹⁴ cm⁻³ in a narrow glass tube of 4 mm in diameter and 50 cm by the m=1 mode of Helicon wave excitation under a magnetif field of 1 kG. The applied rf power is up to 3kW at the frequency of 13.56MHz. The electron density measured by a Langmuir probe was of the order of 10¹⁴ cm⁻³. The formation of a hollow neutral density profile was observed by an optical emission spectroscopy.