Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR

R. M.O. Galvão; V. Bellintani; R. D. Bengtson; A. G. Elfimov; J. I. Elizondo; A. N. Fagundes; A. A. Ferreira; A. M.M. Fonseca; Yu K. Kuznetsov; E. A. Lerche; I. C. Nascimento; L. F. Ruchko; W. P. De Sá; E. A. Saettone; E. Sanada; J. H.F. Severo; R. P. Da Silva; V. S. Tsypin; O. C. Usuriaga; A. Vannucci

doi:10.1088/0741-3335/43/12A/323

Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR

R. M.O. Galvão, V. Bellintani, R. D. Bengtson, A. G. Elfimov, J. I. Elizondo, A. N. Fagundes, A. A. Ferreira, A. M.M. Fonseca, Yu K. Kuznetsov, E. A. Lerche, I. C. Nascimento, L. F. Ruchko, W. P. De Sá, E. A. Saettone, E. Sanada, J. H.F. Severo, R. P. Da Silva, V. S. Tsypin, O. C. Usuriaga, A. Vannucci

Producción científica: Contribución a una revista › Artículo (Contribución a Revista) › revisión exhaustiva

16 Citas (Scopus)

Resumen

Recent results of Alfvén wave heating experiments and the characteristics of a new regime of runaway discharges found in Tokamak Chauffage Alfvén Brésilien (TCABR) are discussed. (1) Wave excitation was carried out with one module of the antenna system, with and without a Faraday screen. Evidence of plasma heating was obtained in both cases, for coupled wave powers up to half of the Ohmic power, approximately, without uncontrollable density rise during the RF pulse. The antenna coupling with the plasma seems to have increased when the Faraday screen was removed. (2) The new regime of runaway discharges is produced by initiating the main plasma breakdown without pre-ionization and strongly increasing the neutral gas fuelling at the end of the current ramp-up phase. Consequently, the plasma cools down substantially and switches to a runaway mode in conditions under which the primary (Dreicer) mechanism is strongly suppressed. This new regime of runaway discharges is characterized by strong enhancement of the relaxation oscillations, which are seen in the Hα and ECE emissions, coupled with large spikes in the line density, loop voltage, bolometer, and other diagnostic signals. © 2001 IOP Publishing Ltd.

Idioma original	Inglés estadounidense
Publicación	Plasma Physics and Controlled Fusion
DOI	https://doi.org/10.1088/0741-3335/43/12A/323
Estado	Publicada - 1 ene. 2001
Publicado de forma externa	Sí

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Galvão, R. M. O., Bellintani, V., Bengtson, R. D., Elfimov, A. G., Elizondo, J. I., Fagundes, A. N., Ferreira, A. A., Fonseca, A. M. M., Kuznetsov, Y. K., Lerche, E. A., Nascimento, I. C., Ruchko, L. F., De Sá, W. P., Saettone, E. A., Sanada, E., Severo, J. H. F., Da Silva, R. P., Tsypin, V. S., Usuriaga, O. C., & Vannucci, A. (2001). Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR. Plasma Physics and Controlled Fusion. https://doi.org/10.1088/0741-3335/43/12A/323

@article{d08be4deba3048eba79cf15d43a3cb7b,

title = "Alfv{\'e}n wave heating and runaway discharges maintained by the avalanche effect in TCABR",

abstract = "Recent results of Alfv{\'e}n wave heating experiments and the characteristics of a new regime of runaway discharges found in Tokamak Chauffage Alfv{\'e}n Br{\'e}silien (TCABR) are discussed. (1) Wave excitation was carried out with one module of the antenna system, with and without a Faraday screen. Evidence of plasma heating was obtained in both cases, for coupled wave powers up to half of the Ohmic power, approximately, without uncontrollable density rise during the RF pulse. The antenna coupling with the plasma seems to have increased when the Faraday screen was removed. (2) The new regime of runaway discharges is produced by initiating the main plasma breakdown without pre-ionization and strongly increasing the neutral gas fuelling at the end of the current ramp-up phase. Consequently, the plasma cools down substantially and switches to a runaway mode in conditions under which the primary (Dreicer) mechanism is strongly suppressed. This new regime of runaway discharges is characterized by strong enhancement of the relaxation oscillations, which are seen in the Hα and ECE emissions, coupled with large spikes in the line density, loop voltage, bolometer, and other diagnostic signals. {\textcopyright} 2001 IOP Publishing Ltd.",

author = "Galv{\~a}o, {R. M.O.} and V. Bellintani and Bengtson, {R. D.} and Elfimov, {A. G.} and Elizondo, {J. I.} and Fagundes, {A. N.} and Ferreira, {A. A.} and Fonseca, {A. M.M.} and Kuznetsov, {Yu K.} and Lerche, {E. A.} and Nascimento, {I. C.} and Ruchko, {L. F.} and {De S{\'a}}, {W. P.} and Saettone, {E. A.} and E. Sanada and Severo, {J. H.F.} and {Da Silva}, {R. P.} and Tsypin, {V. S.} and Usuriaga, {O. C.} and A. Vannucci",

year = "2001",

month = jan,

day = "1",

doi = "10.1088/0741-3335/43/12A/323",

language = "American English",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

}

Galvão, RMO, Bellintani, V, Bengtson, RD, Elfimov, AG, Elizondo, JI, Fagundes, AN, Ferreira, AA, Fonseca, AMM, Kuznetsov, YK, Lerche, EA, Nascimento, IC, Ruchko, LF, De Sá, WP, Saettone, EA, Sanada, E, Severo, JHF, Da Silva, RP, Tsypin, VS, Usuriaga, OC & Vannucci, A 2001, 'Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR', Plasma Physics and Controlled Fusion. https://doi.org/10.1088/0741-3335/43/12A/323

TY - JOUR

T1 - Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR

AU - Galvão, R. M.O.

AU - Bellintani, V.

AU - Bengtson, R. D.

AU - Elfimov, A. G.

AU - Elizondo, J. I.

AU - Fagundes, A. N.

AU - Ferreira, A. A.

AU - Fonseca, A. M.M.

AU - Kuznetsov, Yu K.

AU - Lerche, E. A.

AU - Nascimento, I. C.

AU - Ruchko, L. F.

AU - De Sá, W. P.

AU - Saettone, E. A.

AU - Sanada, E.

AU - Severo, J. H.F.

AU - Da Silva, R. P.

AU - Tsypin, V. S.

AU - Usuriaga, O. C.

AU - Vannucci, A.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Recent results of Alfvén wave heating experiments and the characteristics of a new regime of runaway discharges found in Tokamak Chauffage Alfvén Brésilien (TCABR) are discussed. (1) Wave excitation was carried out with one module of the antenna system, with and without a Faraday screen. Evidence of plasma heating was obtained in both cases, for coupled wave powers up to half of the Ohmic power, approximately, without uncontrollable density rise during the RF pulse. The antenna coupling with the plasma seems to have increased when the Faraday screen was removed. (2) The new regime of runaway discharges is produced by initiating the main plasma breakdown without pre-ionization and strongly increasing the neutral gas fuelling at the end of the current ramp-up phase. Consequently, the plasma cools down substantially and switches to a runaway mode in conditions under which the primary (Dreicer) mechanism is strongly suppressed. This new regime of runaway discharges is characterized by strong enhancement of the relaxation oscillations, which are seen in the Hα and ECE emissions, coupled with large spikes in the line density, loop voltage, bolometer, and other diagnostic signals. © 2001 IOP Publishing Ltd.

AB - Recent results of Alfvén wave heating experiments and the characteristics of a new regime of runaway discharges found in Tokamak Chauffage Alfvén Brésilien (TCABR) are discussed. (1) Wave excitation was carried out with one module of the antenna system, with and without a Faraday screen. Evidence of plasma heating was obtained in both cases, for coupled wave powers up to half of the Ohmic power, approximately, without uncontrollable density rise during the RF pulse. The antenna coupling with the plasma seems to have increased when the Faraday screen was removed. (2) The new regime of runaway discharges is produced by initiating the main plasma breakdown without pre-ionization and strongly increasing the neutral gas fuelling at the end of the current ramp-up phase. Consequently, the plasma cools down substantially and switches to a runaway mode in conditions under which the primary (Dreicer) mechanism is strongly suppressed. This new regime of runaway discharges is characterized by strong enhancement of the relaxation oscillations, which are seen in the Hα and ECE emissions, coupled with large spikes in the line density, loop voltage, bolometer, and other diagnostic signals. © 2001 IOP Publishing Ltd.

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U2 - 10.1088/0741-3335/43/12A/323

DO - 10.1088/0741-3335/43/12A/323

M3 - Article (Contribution to Journal)

SN - 0741-3335

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

ER -

Alfvén wave heating and runaway discharges maintained by the avalanche effect in TCABR

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