The impact of the ITER-like wall at JET on disruptions

P. C. De Vries; G. Arnoux; A. Huber; J. Flanagan; M. Lehnen; V. Riccardo; C. Reux; S. Jachmich; C. Lowry; G. Calabro; D. Frigione; M. Tsalas; N. Hartmann; S. Brezinsek; M. Clever; D. Douai; M. Groth; T. C. Hender; E. Hodille; E. Joffrin; U. Kruezi; G. F. Matthews; J. Morris; R. Neu; V. Philipps; G. Sergienko; M. Sertoli

doi:10.1088/0741-3335/54/12/124032

The impact of the ITER-like wall at JET on disruptions

P. C. De Vries, G. Arnoux, A. Huber, J. Flanagan, M. Lehnen, V. Riccardo, C. Reux, S. Jachmich, C. Lowry, G. Calabro, D. Frigione, M. Tsalas, N. Hartmann, S. Brezinsek, M. Clever, D. Douai, M. Groth, T. C. Hender, E. Hodille, E. JoffrinU. Kruezi, G. F. Matthews, J. Morris, R. Neu, V. Philipps, G. Sergienko, M. Sertoli

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Abstract

The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.

Original language	English
Article number	124032
Journal	Plasma Physics and Controlled Fusion
Volume	54
Issue number	12
DOIs	https://doi.org/10.1088/0741-3335/54/12/124032
State	Published - Dec 2012
Externally published	Yes

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De Vries, P. C., Arnoux, G., Huber, A., Flanagan, J., Lehnen, M., Riccardo, V., Reux, C., Jachmich, S., Lowry, C., Calabro, G., Frigione, D., Tsalas, M., Hartmann, N., Brezinsek, S., Clever, M., Douai, D., Groth, M., Hender, T. C., Hodille, E., ... Sertoli, M. (2012). The impact of the ITER-like wall at JET on disruptions. Plasma Physics and Controlled Fusion, 54(12), Article 124032. https://doi.org/10.1088/0741-3335/54/12/124032

@article{bb0ac1ea1c734c87a6c72413d2c12e1e,

title = "The impact of the ITER-like wall at JET on disruptions",

abstract = "The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.",

author = "{De Vries}, {P. C.} and G. Arnoux and A. Huber and J. Flanagan and M. Lehnen and V. Riccardo and C. Reux and S. Jachmich and C. Lowry and G. Calabro and D. Frigione and M. Tsalas and N. Hartmann and S. Brezinsek and M. Clever and D. Douai and M. Groth and Hender, {T. C.} and E. Hodille and E. Joffrin and U. Kruezi and Matthews, {G. F.} and J. Morris and R. Neu and V. Philipps and G. Sergienko and M. Sertoli",

year = "2012",

month = dec,

doi = "10.1088/0741-3335/54/12/124032",

language = "English",

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journal = "Plasma Physics and Controlled Fusion",

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De Vries, PC, Arnoux, G, Huber, A, Flanagan, J, Lehnen, M, Riccardo, V, Reux, C, Jachmich, S, Lowry, C, Calabro, G, Frigione, D, Tsalas, M, Hartmann, N, Brezinsek, S, Clever, M, Douai, D, Groth, M, Hender, TC, Hodille, E, Joffrin, E, Kruezi, U, Matthews, GF, Morris, J, Neu, R, Philipps, V, Sergienko, G & Sertoli, M 2012, 'The impact of the ITER-like wall at JET on disruptions', Plasma Physics and Controlled Fusion, vol. 54, no. 12, 124032. https://doi.org/10.1088/0741-3335/54/12/124032

TY - JOUR

T1 - The impact of the ITER-like wall at JET on disruptions

AU - De Vries, P. C.

AU - Arnoux, G.

AU - Huber, A.

AU - Flanagan, J.

AU - Lehnen, M.

AU - Riccardo, V.

AU - Reux, C.

AU - Jachmich, S.

AU - Lowry, C.

AU - Calabro, G.

AU - Frigione, D.

AU - Tsalas, M.

AU - Hartmann, N.

AU - Brezinsek, S.

AU - Clever, M.

AU - Douai, D.

AU - Groth, M.

AU - Hender, T. C.

AU - Hodille, E.

AU - Joffrin, E.

AU - Kruezi, U.

AU - Matthews, G. F.

AU - Morris, J.

AU - Neu, R.

AU - Philipps, V.

AU - Sergienko, G.

AU - Sertoli, M.

PY - 2012/12

Y1 - 2012/12

N2 - The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.

AB - The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.

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VL - 54

JO - Plasma Physics and Controlled Fusion

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ER -

The impact of the ITER-like wall at JET on disruptions

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