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Overview of JET results

机译：JET结果概述

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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 (q_(95) = 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 δ_(BT) = 0.08% up to δ_(BT) = 1% to study the effect of TF ripple on high confinement-mode plasmas. The results suggest that δ_(BT) < 0.5% is required on ITER to maintain adequate confinement to allow Q_(DT) = 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.
机译：自上一届国际原子能机构会议以来，JET的科学计划一直侧重于对ITER的综合运行方案进行鉴定，并着重于巩固设计选择和有效利用ITER所必不可少的物理问题。特别关注边缘等离子体的特征，基座能量和边缘局部模式（ELM）及其对等离子体组件（PFC）的影响。对于各种ITER运行方案，已经使用主动方法（例如共振磁场扰动，径向场的快速变化和药丸起搏）对各种ELM缓解技术进行了评估。特别是，通过调节由误差场引起的n = 1个外部扰动场的幅度，可以在很宽的参数范围（q_（95）= 3-4.8，βN≤3.0）内主动控制I型ELM的幅度和频率。校正线圈。对PFC的破坏引起的热负荷进行的研究已利用了新型的广角红外系统和快速测辐射热计来详细考虑时间，位置和能量沉积形式。与ITER相关的特定研究使用了独特的JET功能，将环形场（TF）波动从其正常的低值δ_（BT）= 0.08％更改为δ_（BT）= 1％，以研究TF波动对高压的影响限制模式等离子体。结果表明，在ITER上需要δ_（BT）<0.5％，以保持足够的限制，以使全场Q_（DT）= 10。与ITER直接相关的物理问题包括热量和环形动量传输，利用功率调制将功率输入和扭矩解耦的实验获得了JET中向内动量收缩的第一个实验证据，并确定了离子温度梯度驱动模式的阈值。在支持国际热核实验堆的长期JET计划中，正在进行旨在修改JET第一壁和分流器以及升级中性束和等离子控制系统的活动。所有组件的采购将在2009年完成，铍壁和钨分流器的安装将从2009年夏季延长至2010年夏季。

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