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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 1093-3611

ISSN Online: 1940-4360

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00005 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.07 SJR: 0.198 SNIP: 0.48 CiteScore™:: 1.1 H-Index: 20

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HELMHOLTZ BEHAVIOR OF A NITROGEN PLASMA ARC CHAMBER

Volumen 9, Ausgabe 4, 2005, pp. 583-597
DOI: 10.1615/HighTempMatProc.v9.i4.80
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ABSTRAKT

The dynamic behaviour of an original double anode plasma torch which provides a long lifetime and highly stable supersonic low-pressure nitrogen plasma jet is analyzed by means of classical tools such as FFT, correlation function and Wigner distribution. At both arc chamber stages, the plasma is investigated by means of spectroscopic diagnostics. They reveal that the anode attachments are diffuse rather than local. Electron temperature and number density are comparable to those derived from a simple LTE model. Voltage, arc current and light intensity temporal series exhibit two main characteristic frequencies: the electric generators yield very stable and reproducible 150 Hz oscillations, whereas the firing of the second arc gives birth to a sharp 6.7 kHz peak which is ascribed to the generation of acoustic waves in the region of the first anode attachment. The value of this frequency that depends neither on the electrical injected power nor on the mass flow rate is interpreted by assuming that the arc chamber acts as a Helmholtz oscillator.

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