Analysis of sawtooth phenomena in Alcator C-Mod plasmas

F. Bombarda; P.T. Bonoli; B. Coppi; R.S. Granetz; A.E. Hubbard; J.H. Irby; S. Migliuolo; P. O'Shea; J.E. Rice; Y. Takase; S.M. Wolfe; G.T.A. Huysmans; W. Kerner

doi:10.1088/0029-5515/38/12/310

Analysis of sawtooth phenomena in Alcator C-Mod plasmas

F. Bombarda, P.T. Bonoli, B. Coppi, R.S. Granetz, A.E. Hubbard, J.H. Irby, S. Migliuolo, P. O'Shea, J.E. Rice, Y. Takase, S.M. Wolfe, G.T.A. Huysmans, W. Kerner

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

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The physics of sawtooth oscillations in plasmas produced by the Alcator C-Mod machine is discussed by identifying the regimes that characterize these oscillations, which occur in the central value of the electron temperature, as measured by X ray and/or ECE diagnostics. Sawteeth are generally present in ohmic as well as in RF heated plasmas. It is shown by numerical analysis that these plasmas are stable to ideal internal, pressure driven modes. Hence, the modes responsible for the crash phase of the sawteeth have to be resistive in nature. This is confirmed by numerical computations using a resistive code. The role of energetic ions, produced by ion cyclotron heating, is also discussed.

Originele taal-2	Engels
Pagina's (van-tot)	1861-1869
Tijdschrift	Nuclear Fusion
Volume	38
Nummer van het tijdschrift	12
DOI's	https://doi.org/10.1088/0029-5515/38/12/310
Status	Gepubliceerd - 1 dec. 1998
Extern gepubliceerd	Ja

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10.1088/0029-5515/38/12/310

http://adsabs.harvard.edu/abs/1998NucFu..38.1861B

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title = "Analysis of sawtooth phenomena in Alcator C-Mod plasmas",

abstract = "The physics of sawtooth oscillations in plasmas produced by the Alcator C-Mod machine is discussed by identifying the regimes that characterize these oscillations, which occur in the central value of the electron temperature, as measured by X ray and/or ECE diagnostics. Sawteeth are generally present in ohmic as well as in RF heated plasmas. It is shown by numerical analysis that these plasmas are stable to ideal internal, pressure driven modes. Hence, the modes responsible for the crash phase of the sawteeth have to be resistive in nature. This is confirmed by numerical computations using a resistive code. The role of energetic ions, produced by ion cyclotron heating, is also discussed.",

author = "F. Bombarda and P.T. Bonoli and B. Coppi and R.S. Granetz and A.E. Hubbard and J.H. Irby and S. Migliuolo and P. O'Shea and J.E. Rice and Y. Takase and S.M. Wolfe and G.T.A. Huysmans and W. Kerner",

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doi = "10.1088/0029-5515/38/12/310",

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TY - JOUR

T1 - Analysis of sawtooth phenomena in Alcator C-Mod plasmas

AU - Bombarda, F.

AU - Bonoli, P.T.

AU - Coppi, B.

AU - Granetz, R.S.

AU - Hubbard, A.E.

AU - Irby, J.H.

AU - Migliuolo, S.

AU - O'Shea, P.

AU - Rice, J.E.

AU - Takase, Y.

AU - Wolfe, S.M.

AU - Huysmans, G.T.A.

AU - Kerner, W.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - The physics of sawtooth oscillations in plasmas produced by the Alcator C-Mod machine is discussed by identifying the regimes that characterize these oscillations, which occur in the central value of the electron temperature, as measured by X ray and/or ECE diagnostics. Sawteeth are generally present in ohmic as well as in RF heated plasmas. It is shown by numerical analysis that these plasmas are stable to ideal internal, pressure driven modes. Hence, the modes responsible for the crash phase of the sawteeth have to be resistive in nature. This is confirmed by numerical computations using a resistive code. The role of energetic ions, produced by ion cyclotron heating, is also discussed.

AB - The physics of sawtooth oscillations in plasmas produced by the Alcator C-Mod machine is discussed by identifying the regimes that characterize these oscillations, which occur in the central value of the electron temperature, as measured by X ray and/or ECE diagnostics. Sawteeth are generally present in ohmic as well as in RF heated plasmas. It is shown by numerical analysis that these plasmas are stable to ideal internal, pressure driven modes. Hence, the modes responsible for the crash phase of the sawteeth have to be resistive in nature. This is confirmed by numerical computations using a resistive code. The role of energetic ions, produced by ion cyclotron heating, is also discussed.

U2 - 10.1088/0029-5515/38/12/310

DO - 10.1088/0029-5515/38/12/310

M3 - Article

SN - 0029-5515

VL - 38

SP - 1861

EP - 1869

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

ER -

Analysis of sawtooth phenomena in Alcator C-Mod plasmas

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