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The particle-in-cell (PIC) code XOOPIC is used to model expanding, low-density (ne∼109−1010 cm−3, Te∼5−10 eV) argon plasmas in an effort to further understand the formation of potential gradients in the region of expansion. There is experimental evidence1 that a self-bias voltage forms between the plasma in the grounded expansion chamber and that in the insulating source region in the Madison helicon...
The MadHex experimental system consists of a 150 cm long, 10 cm inner diameter Pyrex tube connected to a stainless steel expansion chamber 60 cm long and 45 cm in diameter (expansion ratio RE = 4.5) with an axial magnetic field, variable up to 1 kG at the source region that is operated in a nozzle configuration. A half-turn double helix antenna, 18 cm long and 12 cm diameter, is used to excite helicon...
The MadHex experimental thruster consists of a 150 cm long, 10 cm inner diameter Pyrex tube connected to a stainless steel expansion chamber 60 cm long and 45 cm in diameter (expansion ratio RE = 4.5) with an axial magnetic field, variable up to 1 kG at the source region that can be operated in nozzle or flat field configurations. An 18 cm long, 12 cm diameter half-turn double-helix antenna is used...
The MadHex experimental system consists of a 150 cm long, 10 cm inner diameter Pyrex tube connected to a stainless steel expansion chamber 60 cm long and 45 cm in diameter (expansion ratio RE = 4.5) with an axial magnetic field, variable up to 1 kG at the source region that can be operated in nozzle or flat field configurations. An 18 cm long, 12 cm diameter half-turn double-helix antenna is used...
A flowing argon helicon plasma is formed in a 10 cm diameter, 1.5 m long Pyrex chamber with an axial magnetic field in nozzle or flat configuration, variable up to 1 kG in the source region. A new expansion chamber has been constructed and initial laser induced fluorescence (LIF) results including ion velocities and temperatures are presented. Microwave interferometry (105 GHz), collisional radiative...
Summary form only given. A flowing argon helicon plasma is formed in a 10 cm diameter, 1.5 m long Pyrex chamber with an axial magnetic field in nozzle or flat configuration, variable up to 1 kG in the source region. Experimental upgrades including a new expansion chamber have been implemented and initial laser induced fluorescence (LIF) results including ion velocities and temperatures are presented...
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