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Title: A review of direct experimental measurements of detachment

Abstract

Detached divertor plasmas feature strong radial and parallel gradients of density, temperature, electric fields and flow over the divertor volume and therefore, sampling the divertor plasma directly provides crucial knowledge to the interpretation and modeling efforts. Here, we review the contribution of diagnostics that directly sample the plasma to the advancement of knowledge of the physics of detachment and detached divertors, such as the characteristics of the various regimes, discovery and quantification of drifts and identification of convection of heat and particles. We focus on wall probes, scanning probes, retarding field analyzers and Thomson Scattering (TS) in the divertor region and also include the contribution of measurements away from the divertor that provide insight on how divertor detachment affects core, edge or pedestal conditions. Finally, wall probes are critical as they can be installed in closed volumes of difficult access to other diagnostics and measure plasma parameters at the divertor structures, which define the plasma boundary conditions and where detachment effects are more likely to be strongest.

Authors:
ORCiD logo [1];  [2];  [1];  [3]
  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1422498
Alternate Identifier(s):
OSTI ID: 1616399
Report Number(s):
LLNL-JRNL-788425
Journal ID: ISSN 0741-3335; TRN: US1801612
Grant/Contract Number:  
FC02-04ER54698; FG02-07ER54917; AC02-09CH11466; FG02-95ER54309; AC04-94AL85000; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics - Plasma physics

Citation Formats

Boedo, J., McLean, A. G., Rudakov, D. L., and Watkins, J. G. A review of direct experimental measurements of detachment. United States: N. p., 2017. Web. doi:10.1088/1361-6587/aaa2ec.
Boedo, J., McLean, A. G., Rudakov, D. L., & Watkins, J. G. A review of direct experimental measurements of detachment. United States. doi:10.1088/1361-6587/aaa2ec.
Boedo, J., McLean, A. G., Rudakov, D. L., and Watkins, J. G. Tue . "A review of direct experimental measurements of detachment". United States. doi:10.1088/1361-6587/aaa2ec. https://www.osti.gov/servlets/purl/1422498.
@article{osti_1422498,
title = {A review of direct experimental measurements of detachment},
author = {Boedo, J. and McLean, A. G. and Rudakov, D. L. and Watkins, J. G.},
abstractNote = {Detached divertor plasmas feature strong radial and parallel gradients of density, temperature, electric fields and flow over the divertor volume and therefore, sampling the divertor plasma directly provides crucial knowledge to the interpretation and modeling efforts. Here, we review the contribution of diagnostics that directly sample the plasma to the advancement of knowledge of the physics of detachment and detached divertors, such as the characteristics of the various regimes, discovery and quantification of drifts and identification of convection of heat and particles. We focus on wall probes, scanning probes, retarding field analyzers and Thomson Scattering (TS) in the divertor region and also include the contribution of measurements away from the divertor that provide insight on how divertor detachment affects core, edge or pedestal conditions. Finally, wall probes are critical as they can be installed in closed volumes of difficult access to other diagnostics and measure plasma parameters at the divertor structures, which define the plasma boundary conditions and where detachment effects are more likely to be strongest.},
doi = {10.1088/1361-6587/aaa2ec},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2017},
month = {12}
}

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