Results 21 to 30 of about 246 (87)

Recent DIII-D progress toward validating models of tungsten erosion, re-deposition, and migration for application to next-step fusion devices

Materials Research Express, 2023
Fundamental mechanisms governing the erosion and prompt re-deposition of tungsten impurities in tokamak divertors are identified and analyzed to inform the lifetime of tungsten plasma-facing components in ITER and other future devices.
T Abrams, J G Guterl, S Abe, D C Donovan, I Bykov, C A Johnson, J H Nichols, J D Elder, D A Ennis, S D Loch, D L Rudakov, G Sinclair, C H Skinner, P C Stangeby, D M Thomas, E A Unterberg, W R Wampler   +16 more
doaj   +1 more source

Local gas injection as a scrape-off layer diagnostic on the Alcator C-Mod tokamak [PDF]

, 1996
A capillary puffing array has been installed on Alcator C-Mod which allows localized introduction of gaseous species in the scrape-off layer. This system has been utilized in experiments to elucidate both global and local properties of edge transport ...
Jablonkski, D.
core   +4 more sources

Recent Progress of Plasma Exhaust Concepts and Divertor Designs for Tokamak DEMO Reactors [PDF]

, 2023
The power exhaust concept and an appropriate divertor design are common critical issues for tokamak DEMO design activities which have been carried out in Europe, Japan, China, Korea and the USA.
Asakura Nobuyuki
core   +1 more source

DETERMINATION OF NEAR-SOL CARBON IMPURITY CONTENT DUE TO DIVERTOR TARGET LEAKAGE USING CARBON-13 TRACERS VIA METHANE INJECTION ON THE DIII-D TOKAMAK [PDF]

, 2022
Experiments with outer strike point injection of isotopically enriched methane (13CD­4) in DIII-D L-mode discharges have demonstrated the ability to infer near scrape-off-layer (SOL) impurity density profiles based on: far-SOL collector probe (CP ...
Duran, Jonah David
core   +1 more source

Screening of Hydrocarbon Sources in JET [PDF]

, 2001
Carbon is the principal impurity in the Joint European Torus (JET). Methane screening experiments quantify the ability of the scrape-off layer (SOL)/divertor system to ionize carbon and transport it to the divertor, preventing core plasma contamination ...
Charlet, M., Collaborators, and EFDA-JET Work Programme, Erents, K., Fundamenski, W., Gafert, J., Giroud, C., Matthews, G., McCracken, G., Philipps, V., Spence, J., Stamp, M. F., Strachan, J. D., von Hellermann, M., Zastrow, K-D.   +13 more
core   +3 more sources

3D global impurity transport modeling with WallDYN and EMC3-Eirene

Nuclear Materials and Energy, 2018
The global impurity migration code WallDYN was coupled to the 3D scrape off layer plasma solver EMC3-Eirene in order to make WallDYN applicable to 3D, non-toroidally symmetric, geometries.
K. Schmid, T. Lunt
doaj   +1 more source

Collector Probe Measurements of SOL Impurity Accumulation and the Implications of SOL Flows on the Accumulation Amount [PDF]

, 2021
A collector probe in its simplest form is a rod inserted into a plasma so that impurities are deposited onto it. These probes are then removed and analyzed to determine the deposition profile both along the length of probe and across the width of it ...
Zamperini, Shawn
core   +1 more source

Modeling of tungsten impurity transport and distribution in EAST based on multi-fluid and kinetic Monte Carlo simulations

AIP Advances
In recent years, the materials of plasma facing components, such as divertor target plates, domes, and outer walls of tokamaks, such as ASDEX Upgrade, WEST, JET, EAST, and ITER, have been changed from carbon to tungsten because of its lower erosion and ...
Ziyang Wen, YiPing Chen, Ling Zhang
doaj   +1 more source

Comparison of the scrape‐off layer two‐point model for deuterium and helium plasmas in JET ITER‐like wall low‐confinement plasma conditions

Contributions to Plasma Physics, Volume 64, Issue 7-8, August-September 2024.
Abstract The hydrogenic two‐point model (H‐2PM), an analytical model for the scrape‐off layer that predicts a common electron and ion temperature and density along a flux tube from a target temperature and density, is adapted to a single‐species helium (He) model, preserving the 2PM assumptions and analytical nature.
David Rees, Joona Sissonen, Mathias Groth, Vesa‐Pekka Rikala, Henri Kumpulainen, Beth Thomas, Mathias Brix, JET Contributors   +7 more
wiley   +1 more source

Comparative studies of tungsten erosion and edge transport under partially detached divertor condition of CFETR with neon and argon seedings

Nuclear Materials and Energy
Neon (Ne) and argon (Ar) impurity seedings are recognized as effective techniques for reducing the divertor heat load in high-power operations of future reactors like CFETR.
Hui Wang, Guoliang Xu, Rui Ding, Hang Si, Guozhang Jia, Jin Guo, Jinheng Zhao, Junling Chen   +7 more
doaj   +1 more source