Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Quasilinear critical gradient model for Alfven eigenmode driven energetic particle transport with intermittency

Journal Article · · Nuclear Fusion
 [1]; ; ;
  1. OSTI
+ Show Author Affiliations
Abstract

A simplified quasilinear critical gradient model (QLCGM) for Alfven eigenmode (AE) driven energetic particle (EP) transport is used to treat the intermittency (burstiness) of the transport. Here intermittency is defined as the ratio of the root mean square deviation from mean flow to the mean flow. The model posits that the intermittency results from the micro-turbulent noise induced in the thermal plasma damping rate for the AE. The model is embedded in a time-dependent EP density transport code to generate the transport-flow time traces from typical critical gradient and slowing down density profiles. The QLCGM appears to be in reasonable agreement with the level and characteristics of the intermittency observed in the DIII-D fast particle loss detector flow time traces: high kurtosis [O(40)] of the burstiness with the intermittencyO(1–2) increasing with the level of mean flow.

Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
FC02-04ER54698; FG02-95ER54309; SC0018108
OSTI ID:
1849039
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 61; ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English

References (17)

The effect of the fast-ion profile on Alfvén eigenmode stability journal August 2013
Prediction of the fusion alpha density profile in ITER from local marginal stability to Alfvén eigenmodes journal October 2014
Energetic particle physics in fusion research in preparation for burning plasma experiments journal November 2014
Anomalous Transport Scaling in the DIII-D Tokamak Matched by Supercomputer Simulation journal July 2003
Simulations tackle abrupt massive migrations of energetic beam ions in a tokamak plasma journal August 2018
Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model journal December 2019
Alfvén eigenmode stability and critical gradient energetic particle transport using the Trapped-Gyro-Landau-Fluid model journal July 2017
Projected profile similarity in gyrokinetic simulations of Bohm and gyro-Bohm scaled DIII-D L and H modes journal July 2006
Gyrokinetic simulations of mesoscale energetic particle-driven Alfvénic turbulent transport embedded in microturbulence journal November 2010
Observation of Critical-Gradient Behavior in Alfvén-Eigenmode-Induced Fast-Ion Transport journal February 2016
Development and validation of a critical gradient energetic particle driven Alfven eigenmode transport model for DIII-D tilted neutral beam experiments journal October 2015
Resonance broadened quasi-linear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes journal June 2018
Non-dimensional scaling of turbulence characteristics and turbulent diffusivity journal September 2001
Excitation of high‐ n toroidicity‐induced shear Alfvén eigenmodes by energetic particles and fusion alpha particles in tokamaks journal November 1992
Multi-phase hybrid simulation of energetic particle driven magnetohydrodynamic instabilities in tokamak plasmas journal November 2016
Nonlinear verification of a linear critical gradient model for energetic particle transport by Alfvén eigenmodes journal December 2017
A comparison of measured and calculated toroidal Alfvén eigenmode damping rates in Alcator C-Mod journal November 2006

Similar Records

Related Subjects

Physics