skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations

Abstract

A variety of experimental studies on pedestal localized fluctuations appearing in between crashes of edge localized modes (ELMs) across several tokamaks have been reviewed and summarized. The onset of the inter-ELM fluctuations is correlated with the evolution of the pedestal gradients. Three profile recovery phases are extracted, which are interlinked with the onsets of different kinds of pedestal fluctuations. Across machines it is found that the pedestal fluctuations can be assorted into at least three categories. These are determined by the fluctuation onset in the ELM cycle, observed frequency range and radial location in the pedestal. Further, the categories might be also related to different instabilities. Similar observations at various machines may point to a underlying generation mechanism that acts similarly for presently accessible pedestal parameter ranges.

Authors:
ORCiD logo [1];  [2];  [3];  [4]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
  2. Princeton Univ., NJ (United States)
  3. Max Planck Inst. for Plasma Physics, Garching (Germany)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1511454
Grant/Contract Number:  
DC-AC02-09Ch11466; SC0015878; SC0015480
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 19; Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma; High confinement mode (H-mode); Edge localized mode (ELM); Pedestal profiles; Edge instabilities

Citation Formats

Laggner, F. M., Diallo, A., Cavedon, M., and Kolemen, E.. Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations. United States: N. p., 2019. Web. doi:10.1016/j.nme.2019.02.030.
Laggner, F. M., Diallo, A., Cavedon, M., & Kolemen, E.. Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations. United States. doi:10.1016/j.nme.2019.02.030.
Laggner, F. M., Diallo, A., Cavedon, M., and Kolemen, E.. Wed . "Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations". United States. doi:10.1016/j.nme.2019.02.030. https://www.osti.gov/servlets/purl/1511454.
@article{osti_1511454,
title = {Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations},
author = {Laggner, F. M. and Diallo, A. and Cavedon, M. and Kolemen, E.},
abstractNote = {A variety of experimental studies on pedestal localized fluctuations appearing in between crashes of edge localized modes (ELMs) across several tokamaks have been reviewed and summarized. The onset of the inter-ELM fluctuations is correlated with the evolution of the pedestal gradients. Three profile recovery phases are extracted, which are interlinked with the onsets of different kinds of pedestal fluctuations. Across machines it is found that the pedestal fluctuations can be assorted into at least three categories. These are determined by the fluctuation onset in the ELM cycle, observed frequency range and radial location in the pedestal. Further, the categories might be also related to different instabilities. Similar observations at various machines may point to a underlying generation mechanism that acts similarly for presently accessible pedestal parameter ranges.},
doi = {10.1016/j.nme.2019.02.030},
journal = {Nuclear Materials and Energy},
number = C,
volume = 19,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: