Neutral-depletion-induced axially asymmetric density in a helicon source and imparted thrust | Zendy

Kazunori Takahashi | Zendy; Yoshinori Takao | Zendy; Akira Ando | Zendy

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Neutral-depletion-induced axially asymmetric density in a helicon source and imparted thrust

Author(s) -

Kazunori Takahashi,

Yoshinori Takao,

Akira Ando

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4942469

Subject(s) - helicon , plasma , microsecond , argon , atomic physics , power density , thrust , phase (matter) , chemistry , materials science , physics , power (physics) , optics , thermodynamics , nuclear physics , organic chemistry

The high plasma density downstream of the source is observed to be sustained only for a fewhundreds of microsecond at the initial phase of the discharge, when pulsing the radiofrequencypower of a helicon plasma thruster. Measured relative density of argon neutrals inside the sourceimplies that the neutrals are significantly depleted there. A position giving a maximum plasmadensity temporally moves to the upstream side of the source due to the neutral depletion and thenthe exhausted plasma density significantly decreases. The direct thrust measurement demonstratesthat the higher thrust-to-power ratio is obtained by using only the initial phase of the high densityplasma, compared with the steady-state operation

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