The impact of divertor detachment on carbon sources in JET L-mode discharges

被引：14

作者：

Brezinsek, S. ^{[1
]}

Meigs, A. G. ^{[2
]}

Jachmich, S.

Stamp, M. F. ^{[2
]}

Rapp, J. ^{[1
]}

Felton, R. ^{[2
]}

Pitts, R. A. ^{[3
]}

Philipps, V. ^{[1
]}

Huber, A. ^{[1
]}

Pugno, R. ^{[4
]}

Sergienko, G. ^{[1
]}

Pospieszczyk, A. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Assoc EURATOM FZJ, Inst Energieforsch Plasmaphys, Julich, Germany

[2] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[3] Assoc EURATOM Confdrat Suisse, CRPP EPFL, CH-1015 Lausanne, Switzerland

[4] Assoc EURATOM Max Planck Inst Plasmaphys, D-85748 Garching, Germany

来源：

JOURNAL OF NUCLEAR MATERIALS | 2009年 / 390-91卷

基金：

英国工程与自然科学研究理事会;

关键词：

PLASMA;

D O I：

10.1016/j.jnucmat.2009.01.100

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hydrocarbon injection experiments have been performed to investigate the chemical sputtering yield of carbon-fibre composites at elevated temperatures (T-surface similar or equal to 500 K) and detached plasma conditions in the JET outer divertor. A plasma scenario in L-mode with the outer strike-point positioned on the load bearing septum replacement plate was developed to detach the outer divertor leg and to provide the strong recombining target plasma. The operational window was explored in a set of discharges with strong deuterium puffing into the private-flux region. Langmuir probes showed a clear roll-over in the ion flux up to complete plasma detachment at the target plate during the density ramp of the discharge. Paschen recombination line analysis shows strong volume recombination with electron temperatures below 2.0 eV prior to the appearance of a radiation instability - an X-point Marfe. A strong reduction of the intrinsic CD photon flux was observed under these conditions, whereas local CD4 injection still led to CD photon flux emission. This provides conclusive evidence for a reduction of the hydrocarbon flux and the chemical sputtering under detached plasma conditions. (C) 2009 Published by Elsevier B.V.

引用

页码：267 / 273

页数：7

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