Title: Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations

Abstract

Time-dependent integrated simulations through codes such as TRANSP are becoming an indispensable tool for the interpretation of existing experiments and predictions of optimized scenarios. For many practical cases, quantitative simulations need to include the effect of plasma instabilities on the evolution of a tokamak discharge. An example is the degradation in energetic particle (EP) confinement induced by instabilities, which in turn affects important source terms for heating, non-inductive current, and momentum in a simulation. The reduced-physics "kick model" provides phase-space resolved transport probability matrices to TRANSP that are used to account for enhanced EP transport by instabilities in addition to neoclassical transport. The model has recovered the measured Alfvén eigenmode (AE) spectrum on NSTX, NSTX-U and DIII-D, and has reproduced details of phase-space resolved fast ion diagnostic data measured on DIII-D for EP-driven modes and tearing modes. In general, the kick model has proven the potential of phase-space resolved EP simulations to unravel details of EP transport for detailed theory/experiment comparison and for scenario planning based on optimization of Neutral Beam (NB) injection parameters. In this work, the extension of the kick model to low-frequency instabilities such as Tearing Modes and fishbones, in addition to AEs, is assessed. The goalmore » is to enable TRANSP simulations that retain the main effects of multiple types of instabilities through a common framework. Results from the NSTX/NSTX-U and DIII-D tokamaks show that the extension to "multi-mode" scenarios can expand the range of applicability of the model for more reliable, quantitative integrated simulations.« less

Authors:

Podesta, Mario  ^[1];

• Search DOE PAGES for author "Podesta, Mario"
• Search DOE PAGES for ORCID "0000-0003-4975-0585"

Bardoczi, Laszlo ^[2]; Collins, Cami ^[2]; Gorelenkov, Nikolai N. ^[1]; Heidbrink, William W.  ^[3];

• Search DOE PAGES for author "Heidbrink, William W."
• Search DOE PAGES for ORCID "0000-0002-6942-8043"

Duarte, Vinicius N.  ^[1];

• Search DOE PAGES for author "Duarte, Vinicius N."
• Search DOE PAGES for ORCID "0000-0001-8096-7518"

Kramer, Gerrit J.  ^[1];

• Search DOE PAGES for author "Kramer, Gerrit J."
• Search DOE PAGES for ORCID "0000-0001-5105-8139"

Fredrickson, Eric D. ^[1]; Gorelenkova, Marina ^[1]; Kim, Doohyun  ^[1];

• Search DOE PAGES for author "Kim, Doohyun"
• Search DOE PAGES for ORCID "0000-0002-6085-9525"

Liu, Deyong  ^[3];

• Search DOE PAGES for author "Liu, Deyong"
• Search DOE PAGES for ORCID "0000-0001-9174-7078"

Poli, Francesca M.  ^[1];

• Search DOE PAGES for author "Poli, Francesca M."
• Search DOE PAGES for ORCID "0000-0003-3959-4371"

Van Zeeland, Michael A.  ^[2];

• Search DOE PAGES for author "Van Zeeland, Michael A."
• Search DOE PAGES for ORCID "0000-0002-7911-2739"

White, Roscoe B. ^[1]

---

+ Show Author Affiliations

1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
2. General Atomics, San Diego, CA (United States)
3. Univ. of California, Irvine, CA (United States)

Publication Date:

Thu Jul 11 00:00:00 EDT 2019

Research Org.:

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1543445

Grant/Contract Number:  

AC02-09CH11466; FC02-04ER54698

Resource Type:

Accepted Manuscript

Journal Name:

Nuclear Fusion

Additional Journal Information:

Journal Volume: 59; Journal Issue: 10; Journal ID: ISSN 0029-5515

Publisher:

IOP Science

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY