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Title: An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW

Journal Article · · Nuclear Materials and Energy
 [1];  [2];  [2];  [2];  [3];  [3];  [4];  [5];  [5];  [6];  [7];  [7];  [7];  [7];  [7];  [8]
  1. National Research Nuclear Univ. MEPhI, Moscow (Russian Federation); Forschungszentrum Julich (Germany)
  2. Forschungszentrum Julich (Germany)
  3. National Research Nuclear Univ. MEPhI, Moscow (Russian Federation)
  4. Max Planck Inst. of Plasma Physics, Garching (Germany)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Lisbon (Portugal); Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
  7. Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
  8. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)

For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux.

Research Organization:
Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom); National Research Nuclear Univ. MEPhI, Moscow (Russian Federation); Forschungszentrum Juelich (Germany); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; European Commission (EC); Ministry of Education and Science of the Russian Federation
Grant/Contract Number:
AC05-00OR22725; 633053; 14.Y26.31.0008
OSTI ID:
1408615
Journal Information:
Nuclear Materials and Energy, Vol. 12; ISSN 2352-1791
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

References (8)

A model of ELM filament energy evolution due to parallel losses journal December 2005
Spectroscopic measurements of Be erosion at JET ILW and interpretation with ERO modelling journal July 2013
Electron cyclotron emission radiometer upgrade on the Joint European Torus (JET) tokamak journal October 2004
The Low Pressure Plane Symmetric Discharge journal August 1959
Plasma-surface interaction in the Be/W environment: Conclusions drawn from the JET-ILW for ITER journal August 2015
Sputtering Yields book January 2007
Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET journal July 2013
Overview on plasma operation with a full tungsten wall in ASDEX Upgrade journal July 2013

Cited By (1)

Erosion, screening, and migration of tungsten in the JET divertor journal August 2019