In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 37, No. 1R ( 1998-01-01), p. 320-
Abstract:
The density and velocities (rotational and axial) of a rotating plasma driven by the J × B Lorentz force and their parametric dependence on radial current I and axial magnetic field B z are investigated in ranges of 3–11 kA and 0–3.6 kG, respectively. Results are compared with those from a simplified single-fluid model that describes the motion of an incompressible plasma with uniform density under the existence of ion production by electron-impact ionization and ion loss by convection to electrodes. In the experiment, argon plasmas are produced by the pulsed discharge (28 µs) of a coaxial plasma gun and are accelerated in both the azimuthal and axial directions by J × B z and J × B θ forces, respectively, where B θ is induced by I . Typical values of the plasma density n , the rotational frequency ω and the axial velocity v z are ∼10 21 m -3 , ≃1 ×10 6 rad/s and ≃2 ×10 4 m/s, respectively, at I =9 kA and B z =3.6 kG. Scaling laws derived from the experiment: n ∝ I 2 B z 0 , ω∝ I 1 B z 1 n -1 and v z ∝ I 2 B z 0 n -1 , are found to agree well with predictions of the model. As a result, plasma production and acceleration are found to be strongly related to each other.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1998
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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