ELMy H-modes in JET helium-4 plasmas

D. C. McDonald; J. G. Cordey; E. Righi; F. Ryter; G. Saibene; R. Sartori; B. Alper; M. Becoulet; J. Brzozowski; I. Coffey; M. De Baar; P. De Vries; K. Erents; W. Fundamenski; C. Giroud; I. Jenkins; A. Loarte; P. J. Lomas; G. P. Maddison; J. Mailloux; A. Murari; J. Ongena; J. Rapp; R. A. Pitts; M. Stamp; J. Strachan; W. Suttrop

doi:10.1088/0741-3335/46/3/007

ELMy H-modes in JET helium-4 plasmas

D. C. McDonald, J. G. Cordey, E. Righi, F. Ryter, G. Saibene, R. Sartori, B. Alper, M. Becoulet, J. Brzozowski, I. Coffey, M. De Baar, P. De Vries, K. Erents, W. Fundamenski, C. Giroud, I. Jenkins, A. Loarte, P. J. Lomas, G. P. Maddison, J. MaillouxA. Murari, J. Ongena, J. Rapp, R. A. Pitts, M. Stamp, J. Strachan, W. Suttrop

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Abstract

ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in mind, a series of helium-4 H-mode experiments were performed on JET with pure helium-4 NET auxiliary heating (up to 12 MW). A set of ELMy H-mode plasmas were produced, in both the Type I ELM regime and a second regime, which showed characteristics similar to the deuterium Type III regime, but with a reverse ELM frequency dependence on power. Sawteeth were also observed, and had similar behaviour to those seen in deuterium. Compared with deuterium plasmas, Type I ELMy H-mode confinement is seen to be 28 ± 6% poorer in helium-4 plasmas and the L-H power threshold 42 ± 10% larger. This is the opposite of the behaviour predicted by experimental isotope mass scalings from hydrogenic plasmas.

Original language	English
Pages (from-to)	519-534
Number of pages	16
Journal	Plasma Physics and Controlled Fusion
Volume	46
Issue number	3
DOIs	https://doi.org/10.1088/0741-3335/46/3/007
State	Published - Mar 2004
Externally published	Yes

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McDonald, D. C., Cordey, J. G., Righi, E., Ryter, F., Saibene, G., Sartori, R., Alper, B., Becoulet, M., Brzozowski, J., Coffey, I., De Baar, M., De Vries, P., Erents, K., Fundamenski, W., Giroud, C., Jenkins, I., Loarte, A., Lomas, P. J., Maddison, G. P., ... Suttrop, W. (2004). ELMy H-modes in JET helium-4 plasmas. Plasma Physics and Controlled Fusion, 46(3), 519-534. https://doi.org/10.1088/0741-3335/46/3/007

@article{89806e051635411d9a0943c3ba466b5d,

title = "ELMy H-modes in JET helium-4 plasmas",

abstract = "ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in mind, a series of helium-4 H-mode experiments were performed on JET with pure helium-4 NET auxiliary heating (up to 12 MW). A set of ELMy H-mode plasmas were produced, in both the Type I ELM regime and a second regime, which showed characteristics similar to the deuterium Type III regime, but with a reverse ELM frequency dependence on power. Sawteeth were also observed, and had similar behaviour to those seen in deuterium. Compared with deuterium plasmas, Type I ELMy H-mode confinement is seen to be 28 ± 6\% poorer in helium-4 plasmas and the L-H power threshold 42 ± 10\% larger. This is the opposite of the behaviour predicted by experimental isotope mass scalings from hydrogenic plasmas.",

author = "McDonald, \{D. C.\} and Cordey, \{J. G.\} and E. Righi and F. Ryter and G. Saibene and R. Sartori and B. Alper and M. Becoulet and J. Brzozowski and I. Coffey and \{De Baar\}, M. and \{De Vries\}, P. and K. Erents and W. Fundamenski and C. Giroud and I. Jenkins and A. Loarte and Lomas, \{P. J.\} and Maddison, \{G. P.\} and J. Mailloux and A. Murari and J. Ongena and J. Rapp and Pitts, \{R. A.\} and M. Stamp and J. Strachan and W. Suttrop",

year = "2004",

month = mar,

doi = "10.1088/0741-3335/46/3/007",

language = "English",

volume = "46",

pages = "519--534",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing",

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McDonald, DC, Cordey, JG, Righi, E, Ryter, F, Saibene, G, Sartori, R, Alper, B, Becoulet, M, Brzozowski, J, Coffey, I, De Baar, M, De Vries, P, Erents, K, Fundamenski, W, Giroud, C, Jenkins, I, Loarte, A, Lomas, PJ, Maddison, GP, Mailloux, J, Murari, A, Ongena, J, Rapp, J, Pitts, RA, Stamp, M, Strachan, J & Suttrop, W 2004, 'ELMy H-modes in JET helium-4 plasmas', Plasma Physics and Controlled Fusion, vol. 46, no. 3, pp. 519-534. https://doi.org/10.1088/0741-3335/46/3/007

TY - JOUR

T1 - ELMy H-modes in JET helium-4 plasmas

AU - McDonald, D. C.

AU - Cordey, J. G.

AU - Righi, E.

AU - Ryter, F.

AU - Saibene, G.

AU - Sartori, R.

AU - Alper, B.

AU - Becoulet, M.

AU - Brzozowski, J.

AU - Coffey, I.

AU - De Baar, M.

AU - De Vries, P.

AU - Erents, K.

AU - Fundamenski, W.

AU - Giroud, C.

AU - Jenkins, I.

AU - Loarte, A.

AU - Lomas, P. J.

AU - Maddison, G. P.

AU - Mailloux, J.

AU - Murari, A.

AU - Ongena, J.

AU - Rapp, J.

AU - Pitts, R. A.

AU - Stamp, M.

AU - Strachan, J.

AU - Suttrop, W.

PY - 2004/3

Y1 - 2004/3

N2 - ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in mind, a series of helium-4 H-mode experiments were performed on JET with pure helium-4 NET auxiliary heating (up to 12 MW). A set of ELMy H-mode plasmas were produced, in both the Type I ELM regime and a second regime, which showed characteristics similar to the deuterium Type III regime, but with a reverse ELM frequency dependence on power. Sawteeth were also observed, and had similar behaviour to those seen in deuterium. Compared with deuterium plasmas, Type I ELMy H-mode confinement is seen to be 28 ± 6% poorer in helium-4 plasmas and the L-H power threshold 42 ± 10% larger. This is the opposite of the behaviour predicted by experimental isotope mass scalings from hydrogenic plasmas.

AB - ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in mind, a series of helium-4 H-mode experiments were performed on JET with pure helium-4 NET auxiliary heating (up to 12 MW). A set of ELMy H-mode plasmas were produced, in both the Type I ELM regime and a second regime, which showed characteristics similar to the deuterium Type III regime, but with a reverse ELM frequency dependence on power. Sawteeth were also observed, and had similar behaviour to those seen in deuterium. Compared with deuterium plasmas, Type I ELMy H-mode confinement is seen to be 28 ± 6% poorer in helium-4 plasmas and the L-H power threshold 42 ± 10% larger. This is the opposite of the behaviour predicted by experimental isotope mass scalings from hydrogenic plasmas.

UR - https://www.scopus.com/pages/publications/12144287561

U2 - 10.1088/0741-3335/46/3/007

DO - 10.1088/0741-3335/46/3/007

M3 - Article

AN - SCOPUS:12144287561

SN - 0741-3335

VL - 46

SP - 519

EP - 534

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 3

ER -

ELMy H-modes in JET helium-4 plasmas

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