ELM induced tungsten melting and its impact on tokamak operation

Coenen, J.W.; Arnoux, G.; Bazylev, B.; Matthews, G. F.; Jachmich, S.; Balboa, I.; Clever, M.; Dejarnac, Renaud; Coffey, I.; Corre, Y.; Devaux, S.; Frassinetti, L.; Gauthier, E.; Horáček, Jan; Knaup, M.; Komm, Michael; Krieger, K.; Marsen, S.; Meigs, A.; Mertens, Ph.; Pitts, R.A.; Puetterich, T.; Rack, M.; Stamp, M.; Sergienko, G.; Tamain, P.; Thompson, V.

Number of the records: 1

ELM induced tungsten melting and its impact on tokamak operation

1.

SYSNO ASEP	0433538
Document Type	A - Abstract
R&D Document Type	Není vybrán druh dokumentu
Title	ELM induced tungsten melting and its impact on tokamak operation
Author(s)	Coenen, J.W. (DE) Arnoux, G. (GB) Bazylev, B. (DE) Matthews, G. F. (GB) Jachmich, S. (DE) Balboa, I. (GB) Clever, M. (DE) Dejarnac, Renaud (UFP-V)_{RID, ORCID} Coffey, I. (GB) Corre, Y. (FR) Devaux, S. (GB) Frassinetti, L. (SE) Gauthier, E. (FR) Horáček, Jan (UFP-V)_{RID, ORCID} Knaup, M. (DE) Komm, Michael (UFP-V)_{RID, ORCID} Krieger, K. (DE) Marsen, S. (DE) Meigs, A. (GB) Mertens, Ph. (DE) Pitts, R.A. (FR) Puetterich, T. (DE) Rack, M. (DE) Stamp, M. (GB) Sergienko, G. (GB) Tamain, P. (GB) Thompson, V. (GB)
Number of authors	28
Source Title	21st International Conference on Plasma Surface Interactions 2014. - Toki City : National Institute for Fusion Science, 2014 S. 1-93
Number of pages	93 s.
Publication form	Print - P
Action	International Conference on Plasma Surface Interactions 2014/21./
Event date	26.05.2014-30.05.2014
VEvent location	Kanazawa
Country	JP - Japan
Event type	WRD
Language	eng - English
Country	JP - Japan
Keywords	Heat loads ; misalignment ; JET ; tungsten ; melting
Subject RIV	BL - Plasma and Gas Discharge Physics
Institutional support	UFP-V - RVO:61389021
Annotation	In JET-ILW dedicated melt exposures were performed using a sequence of H-Mode JET pulses with regular type I ELMs.In order to assess the risk of starting ITER operations with a full W divertor,one of the task was to measure the consequences of W transients melting due to ELMs.By moving the outer strike point (OSP) onto a dedicated leading edge the base temperature was raised within 1s to allow transient ELM-driven melting during the subsequent 0.5 s. Almost 6mm3 of W was moved by 150 ELMs within 5 subsequent discharges. Significant material losses in terms of ejections into the plasma were not observed. There is indirect evidence that some small droplets were ejected.The impact on the main plasma parameters is minor and no disruptions occurred.The W-melt gradually moved along the lamella edge towards the high field side, driven by jxB forces.The evaporation rate determined is 100 times less than expected from steady state melting and thus only consistent with transient melting
Workplace	Institute of Plasma Physics
Contact	Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
Year of Publishing	2015

Number of the records: 1