Overview of JET results

JET EFDA contributors

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Since the last IAEA conference, the scientific programme of JET has focused on the qualification of the integrated operating scenarios for ITER and on physics issues essential for the consolidation of design choices and the efficient exploitation of ITER. Particular attention has been given to the characterization of the edge plasma, pedestal energy and edge localized modes (ELMs), and their impact on plasma facing components (PFCs). Various ELM mitigation techniques have been assessed for all ITER operating scenarios using active methods such as resonant magnetic field perturbation, rapid variation of the radial field and pellet pacing. In particular, the amplitude and frequency of type I ELMs have been actively controlled over a wide parameter range (q95 = 3-4.8, βN ≥ 3.0) by adjusting the amplitude of the n = 1 external perturbation field induced by error field correction coils. The study of disruption induced heat loads on PFCs has taken advantage of a new wide-angle viewing infrared system and a fast bolometer to provide a detailed account of time, localization and form of the energy deposition. Specific ITER-relevant studies have used the unique JET capability of varying the toroidal field (TF) ripple from its normal low value δBT = 0.08% up to δBT = 1% to study the effect of TF ripple on high confinement-mode plasmas. The results suggest that δBT <0.5% is required on ITER to maintain adequate confinement to allow QDT = 10 at full field. Physics issues of direct relevance to ITER include heat and toroidal momentum transport, with experiments using power modulation to decouple power input and torque to achieve first experimental evidence of inward momentum pinch in JET and determine the threshold for ion temperature gradient driven modes. Within the longer term JET programme in support of ITER, activities aiming at the modification of the JET first wall and divertor and the upgrade of the neutral beam and plasma control systems are being conducted. The procurement of all components will be completed by 2009 with the shutdown for the installation of the beryllium wall and tungsten divertor extending from summer 2009 to summer 2010.

Original languageEnglish
Article number104006
JournalNuclear Fusion
Volume49
Issue number10
DOIs
Publication statusPublished - 2009

Fingerprint

ripples
summer
procurement
momentum
perturbation
heat
shutdowns
physics
plasma control
consolidation
neutral beams
qualifications
bolometers
ion temperature
exploitation
beryllium
pellets
installing
torque
temperature gradients

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Overview of JET results. / JET EFDA contributors.

In: Nuclear Fusion, Vol. 49, No. 10, 104006, 2009.

Research output: Contribution to journalArticle

JET EFDA contributors 2009, 'Overview of JET results', Nuclear Fusion, vol. 49, no. 10, 104006. https://doi.org/10.1088/0029-5515/49/10/104006
JET EFDA contributors. / Overview of JET results. In: Nuclear Fusion. 2009 ; Vol. 49, No. 10.
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AU - Angioni, C.

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AU - Artaud, J. F.

AU - Ash, A.

AU - Asp, E.

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AU - Baciero, A.

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