The effect of high-frequency electric field on a plasma induced arc.

Shen, Yonghang; Takamura, S.; Aoyama, Goro; Okuda, Takayoshi

doi:10.1585/jspf1958.55.491

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The P. F. in r. f. sheath repels the electrons coming to the material surface. This has been really observed in the experiment on plasma-assisted bipolar arc [3], in which the superposition of high frequency field on d. c. voltage makes the arc initiation voltage higher than that without r. f.…”

Section: Sheath Modificationmentioning

confidence: 69%

Reduction of Plasma Heat Flow by Sheath‐Presheath Modifications with Ponderomotive Force

Masuzaki

Takamura

1994

Contrib. Plasma Phys.

View full text Add to dashboard Cite

A r. f. induced directed force exerted by the application of r. f. voltage on the divenor plate or by introducing r. f. electric field in front of the plate is taken into account for the analysis on sheath-presheath formation in a very simple manner. The ponderomotive force repels electrons coming to the divertor plate, which results in a reduction of the electron heat flow. The reduction of ionic impact energy to the plate is also expected even for presheath ,modification combined with positive divertor biasing as well as for successful sheath modification.

show abstract

Section: Sheath Modificationmentioning

confidence: 69%

Reduction of Plasma Heat Flow by Sheath‐Presheath Modifications with Ponderomotive Force

Masuzaki

Takamura

1994

Contrib. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…This has been really observed in the experiment on plasma-assisted bipolar arc, 22 in which the superposition of rf field on dc voltage makes the arc initiation voltage higher than that without rf.…”

Section: Sheath Modificationmentioning

confidence: 73%

Heat flows through plasma sheaths

Takamura

Kuwabara

et al. 1998

Physics of Plasmas

View full text Add to dashboard Cite

Plasma heat flow to material surfaces through sheaths is studied, taking several key physics factors into account. Electron emission from the surface, which breaks a thermal insulation of the sheath, is studied in both thermoelectron emission ͑TEE͒ and secondary electron emission ͑SEE͒, in which a correct expression under space charge limited condition is given for arbitrary sheath voltages. Nonlinear thermal bifurcation induced by electron emission is analyzed in the experiment and the theory. The local heat flow was found to be enhanced by a thermal contraction induced by cross-field potential variation in a plasma. An enhancement of SEE of hydrogen-absorbed graphite, and a suppression of SEE by the gyromotion of emitted electrons in obliquely incident magnetic field are identified. The effects of ion reflection on the surface and ponderomotive force are also discussed in terms of energy transmission factor ␦. An anomaly of ␦ in detached recombining plasmas is discussed.

show abstract

“…Figure 1(b) shows the method of generating the gaseous carbon plasma. A plasma-assisted arc was ignited by applying a negative high voltage to the carbon rod inserted in the tokamak plasma with respect to the vacuum chamber [7,8]. A movable Langmuir probe is employed to measure the radial profiles of the plasma parameters.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…We have proposed the generation of a gaseous plasma not from the volatile gas, but from the solid material by a plasma-assisted arc [5,6]. We apply this method to generating a high-density carbon plasma with a large volume in a low-temperature tokamak discharge [7,8]. For instance, one could consider applying this strongly ionized tokamak discharge to plasma processing, especially to the synthesis of thin films.…”

Section: Introductionmentioning

confidence: 99%

Characterization of gaseous carbon plasma in a low-temperature tokamak discharge

Matsuda¹,

Ohno²,

Takamura³

1996

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

A strongly ionized carbon plasma was generated in a tokamak discharge. The electron density of carbon plasma produced by a plasma-assisted arc was found to be about 10 19 m −3 . The carbon ion (C + ) density was estimated to be about 1.5 × 10 18 m −3 by use of the comparison spectroscopic method. Two-dimensional distributions of carbon ionization states were observed with an ICCD camera. The transport of carbon atoms is not influenced by the toroidal magnetic field, but carbon ions tend to move along the magnetic field.

show abstract

The effect of high-frequency electric field on a plasma induced arc.

Cited by 4 publications

References 0 publications

Reduction of Plasma Heat Flow by Sheath‐Presheath Modifications with Ponderomotive Force

Reduction of Plasma Heat Flow by Sheath‐Presheath Modifications with Ponderomotive Force

Heat flows through plasma sheaths

Characterization of gaseous carbon plasma in a low-temperature tokamak discharge

Contact Info

Product

Resources

About