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Impurity transport at the plasma edge

Technical Report:

Abstract

Of the three major links in the chain connecting plasma edge conditions to central impurity levels - production; edge transport; and, central transport - edge transport is the weakest link in that it is the most complex, least understood and hardest to measure directly. A large number of edge impurity measurements can be made, however, which when interpreted in conjunction with an edge impurity transport model can improve understanding and increase confidence in prediction. These quantities include 3-D spatial distributions of impurity densities and impurity temperatures in the successive stages of ionization from the neutral state to full ionization. Some examples of such experiments carried out in JET and TEXTOR and their interpretation using a Monte Carlo impurity transport code are presented. The field remains in an early state of development and ultimate quantities, such as the central impurity density, can only be explained/predicted to within uncertainty factors, typically greater than two. Examples are given of modelling the central Z{sub eff} in JET ohmic discharges employing carbon or beryllium toroidal limiters. A new definition of `impurity screening` is presented with the objective of finding a convenient quantitative relation between edge plasma conditions and central impurity levels.
Authors:
Stangeby, P C [1] 
  1. Toronto Univ., ON (Canada). Inst. for Aerospace Studies
Publication Date:
Jun 01, 1990
Product Type:
Technical Report
Report Number:
CFFTP-G-9041
Reference Number:
SCA: 700330; PA: AIX-24:009294; SN: 93000933687
Resource Relation:
Other Information: PBD: Jun 1990
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA IMPURITIES; CHARGED-PARTICLE TRANSPORT THEORY; CHARGED-PARTICLE TRANSPORT; EDGE LOCALIZED MODES; JET TOKAMAK; LIMITERS; MONTE CARLO METHOD; SPATIAL DISTRIBUTION; TEXTOR TOKAMAK; 700330; PLASMA KINETICS, TRANSPORT, AND IMPURITIES
OSTI ID:
10119853
Research Organizations:
Canadian Fusion Fuels Technology Project, Toronto, ON (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE93613684; TRN: CA9200981009294
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[57] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Stangeby, P C. Impurity transport at the plasma edge. Canada: N. p., 1990. Web.
Stangeby, P C. Impurity transport at the plasma edge. Canada.
Stangeby, P C. 1990. "Impurity transport at the plasma edge." Canada.
@misc{etde_10119853,
title = {Impurity transport at the plasma edge}
author = {Stangeby, P C}
abstractNote = {Of the three major links in the chain connecting plasma edge conditions to central impurity levels - production; edge transport; and, central transport - edge transport is the weakest link in that it is the most complex, least understood and hardest to measure directly. A large number of edge impurity measurements can be made, however, which when interpreted in conjunction with an edge impurity transport model can improve understanding and increase confidence in prediction. These quantities include 3-D spatial distributions of impurity densities and impurity temperatures in the successive stages of ionization from the neutral state to full ionization. Some examples of such experiments carried out in JET and TEXTOR and their interpretation using a Monte Carlo impurity transport code are presented. The field remains in an early state of development and ultimate quantities, such as the central impurity density, can only be explained/predicted to within uncertainty factors, typically greater than two. Examples are given of modelling the central Z{sub eff} in JET ohmic discharges employing carbon or beryllium toroidal limiters. A new definition of `impurity screening` is presented with the objective of finding a convenient quantitative relation between edge plasma conditions and central impurity levels.}
place = {Canada}
year = {1990}
month = {Jun}
}