Modifications of plasma density profile and thrust by neutral injection in a helicon plasma thruster | Zendy

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

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Modifications of plasma density profile and thrust by neutral injection in a helicon plasma thruster

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 - 10.1063/1.4967193

Subject(s) - helicon , plasma , propellant , thrust , argon , volumetric flow rate , mechanics , torr , upstream (networking) , atomic physics , chemistry , upstream and downstream (dna) , vacuum chamber , materials science , physics , thermodynamics , nuclear physics , computer network , organic chemistry , computer science , composite material

Argon propellant is introduced from the upstream and downstream sides of a high power helicon plasma thruster. The plasma density profile and the imparted thrust are measured for various upstream and downstream argon flow rates, where the total gas flow rate of 70 sccm and the resultant vacuum chamber pressure of 0.2 mTorr are maintained. It is observed that the imparted thrust increases with an increase in the downstream gas flow rate; simultaneously an upstream-peaking profile of the plasma density observed for the upstream gas injection becomes uniform for the downstream gas injection. The difference in the thrust between the upstream and downstream gas injections is enhanced by increasing the rf power. The observed density profiles are qualitatively consistent with theoretical predictions taking a neutral depletion effect into account

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