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Title: Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes

Abstract

We show that the degradation of fast-ion confinement in steady-state DIII-D discharges is quantitatively consistent with predictions based on the effects of multiple unstable Alfv´en eigenmodes on beam-ion transport. Simulation and experiment show that increasing the radius where the magnetic safety factor has its minimum is effective in minimizing beam-ion transport. This is favorable for achieving high performance steady-state operation in DIII-D and future reactors. A comparison between the experiments and a critical gradient model, in which only equilibrium profiles were used to predict the most unstable modes, show that in a number of cases this model reproduces the measured neutron rate well.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [1];  [3];  [1];  [4];  [4];  [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Irvine, CA (United States)
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1353401
Alternate Identifier(s):
OSTI ID: 1361428
Grant/Contract Number:  
AC02-09CH11466; SC-G903402; FC02-04ER54698; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fast-ion transport; Alfven eigenmodes; high-performance plasmas; toroidal plasmas; tokamak; stability; modes; code; simulations; transport; existence

Citation Formats

Kramer, Geritt J., Podestà, Mario, Holcomb, Christopher, Cui, L., Gorelenkov, Nikolai N., Grierson, Brian, Heidbrink, William W., Nazikian, Raffi. M., Solomon, Wayne M., Van Zeeland, Michael A., and Zhu, Yubao. Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes. United States: N. p., 2017. Web. https://doi.org/10.1088/1741-4326/aa6456.
Kramer, Geritt J., Podestà, Mario, Holcomb, Christopher, Cui, L., Gorelenkov, Nikolai N., Grierson, Brian, Heidbrink, William W., Nazikian, Raffi. M., Solomon, Wayne M., Van Zeeland, Michael A., & Zhu, Yubao. Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes. United States. https://doi.org/10.1088/1741-4326/aa6456
Kramer, Geritt J., Podestà, Mario, Holcomb, Christopher, Cui, L., Gorelenkov, Nikolai N., Grierson, Brian, Heidbrink, William W., Nazikian, Raffi. M., Solomon, Wayne M., Van Zeeland, Michael A., and Zhu, Yubao. Tue . "Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes". United States. https://doi.org/10.1088/1741-4326/aa6456. https://www.osti.gov/servlets/purl/1353401.
@article{osti_1353401,
title = {Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes},
author = {Kramer, Geritt J. and Podestà, Mario and Holcomb, Christopher and Cui, L. and Gorelenkov, Nikolai N. and Grierson, Brian and Heidbrink, William W. and Nazikian, Raffi. M. and Solomon, Wayne M. and Van Zeeland, Michael A. and Zhu, Yubao},
abstractNote = {We show that the degradation of fast-ion confinement in steady-state DIII-D discharges is quantitatively consistent with predictions based on the effects of multiple unstable Alfv´en eigenmodes on beam-ion transport. Simulation and experiment show that increasing the radius where the magnetic safety factor has its minimum is effective in minimizing beam-ion transport. This is favorable for achieving high performance steady-state operation in DIII-D and future reactors. A comparison between the experiments and a critical gradient model, in which only equilibrium profiles were used to predict the most unstable modes, show that in a number of cases this model reproduces the measured neutron rate well.},
doi = {10.1088/1741-4326/aa6456},
journal = {Nuclear Fusion},
number = 5,
volume = 57,
place = {United States},
year = {2017},
month = {3}
}

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