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Title: Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod

Abstract

Here, experiments on the Alcator C-Mod tokamak have utilized reactor-relevant magnetic fields to sustain substantially higher pedestal pressure than in other devices and allow close approach to the ITER H-mode baseline target pedestal pressure of 90 kPa. The EPED model, which couples the physics of transport driven by kinetic ballooning modes and MHD instabilities arising from peeling-ballooning modes, predicts the pressure profile at the onset of edge-localized modes (ELMs), and yields to lowest order a critical-β N like behavior for the pedestal: p α Bt x BpB2t for fixed edge q). C-Mod routinely accesses edge plasma pressure in excess of 30 kPa, often by using a high-density (n¯e > 3 x 1020 m–3) approach to high confinement, taking advantage of a regime known as enhanced D-alpha (EDA) H-mode.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [1];  [4];  [5];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. College of William and Mary, Williamsburg, VA (United States)
  5. 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
OSTI Identifier:
1485108
Grant/Contract Number:  
AC02-09CH11466; AC05-00OR22725; FC02-06ER54873; FC02-99ER54512; FG02-95ER54309; SC0007880
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 11; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; edge pedestal; H-mode; high field tokamak; Alcator C-Mod; model validation

Citation Formats

Hughes, J. W., Snyder, P. B., Reinke, M. L., LaBombard, B., Mordijck, S., Scott, S., Tolman, E., Baek, S. G., Golfinopoulos, T., Granetz, R. S., Greenwald, M., Hubbard, A. E., Marmar, E., Rice, J. E., White, A. E., Whyte, D. G., Wilks, T., and Wolfe, S. Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aabc8a.
Hughes, J. W., Snyder, P. B., Reinke, M. L., LaBombard, B., Mordijck, S., Scott, S., Tolman, E., Baek, S. G., Golfinopoulos, T., Granetz, R. S., Greenwald, M., Hubbard, A. E., Marmar, E., Rice, J. E., White, A. E., Whyte, D. G., Wilks, T., & Wolfe, S. Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod. United States. doi:10.1088/1741-4326/aabc8a.
Hughes, J. W., Snyder, P. B., Reinke, M. L., LaBombard, B., Mordijck, S., Scott, S., Tolman, E., Baek, S. G., Golfinopoulos, T., Granetz, R. S., Greenwald, M., Hubbard, A. E., Marmar, E., Rice, J. E., White, A. E., Whyte, D. G., Wilks, T., and Wolfe, S. Thu . "Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod". United States. doi:10.1088/1741-4326/aabc8a. https://www.osti.gov/servlets/purl/1485108.
@article{osti_1485108,
title = {Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod},
author = {Hughes, J. W. and Snyder, P. B. and Reinke, M. L. and LaBombard, B. and Mordijck, S. and Scott, S. and Tolman, E. and Baek, S. G. and Golfinopoulos, T. and Granetz, R. S. and Greenwald, M. and Hubbard, A. E. and Marmar, E. and Rice, J. E. and White, A. E. and Whyte, D. G. and Wilks, T. and Wolfe, S.},
abstractNote = {Here, experiments on the Alcator C-Mod tokamak have utilized reactor-relevant magnetic fields to sustain substantially higher pedestal pressure than in other devices and allow close approach to the ITER H-mode baseline target pedestal pressure of 90 kPa. The EPED model, which couples the physics of transport driven by kinetic ballooning modes and MHD instabilities arising from peeling-ballooning modes, predicts the pressure profile at the onset of edge-localized modes (ELMs), and yields to lowest order a critical-β N like behavior for the pedestal: p α Bt x Bp (α B2t for fixed edge q). C-Mod routinely accesses edge plasma pressure in excess of 30 kPa, often by using a high-density (n¯e > 3 x 1020 m–3) approach to high confinement, taking advantage of a regime known as enhanced D-alpha (EDA) H-mode.},
doi = {10.1088/1741-4326/aabc8a},
journal = {Nuclear Fusion},
number = 11,
volume = 58,
place = {United States},
year = {2018},
month = {9}
}

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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: Poloidal section of Alcator C-Mod with typical magnetic equilibria referenced in the text: (a) a Type I ELMy H-mode, (b) a high pressure EDA H-mode without ELMs, (c) a low-collisionality H-mode without ELMs

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