Density Limits as Disruption Forecasters for Spherical Tokamaks

Berkery, John

doi:10.34770/67tb-0988

Title: Density Limits as Disruption Forecasters for Spherical Tokamaks

Dataset
Other Related Research

Authors:

Princeton Plasma Physics Laboratory; Princeton Plasma Physics Laboratory

Publication Date:: Sun Jan 01 04:00:00 UTC 2023

DOE Contract Number:: AC02-09CH11466

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

Subject:: density limit; disruptions; tokamak

OSTI Identifier:: 2001088

DOI:: https://doi.org/10.34770/67tb-0988

Citation Formats


                    Berkery, John. Density Limits as Disruption Forecasters for Spherical Tokamaks.  United States: N. p., 2023. 
        Web.  doi:10.34770/67tb-0988.

Copy to clipboard


                    Berkery, John. Density Limits as Disruption Forecasters for Spherical Tokamaks.  United States.  doi:https://doi.org/10.34770/67tb-0988

Copy to clipboard


                    Berkery, John. 2023.  
"Density Limits as Disruption Forecasters for Spherical Tokamaks".  United States.  doi:https://doi.org/10.34770/67tb-0988.  https://www.osti.gov/servlets/purl/2001088. Pub date:Sun Jan 01 04:00:00 UTC 2023

Copy to clipboard


                    
@article{osti_2001088,

  title        = {Density Limits as Disruption Forecasters for Spherical Tokamaks},

  author       = {Berkery, John},

  abstractNote = {},

  doi          = {10.34770/67tb-0988},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 04:00:00 UTC 2023},

  month        = {Sun Jan 01 04:00:00 UTC 2023}

}

Copy to clipboard

Dataset:

View Dataset

DOI: https://doi.org/10.34770/67tb-0988

Save / Share:

Export Metadata

Save to My Library

Similar records in DOE Data Explorer and OSTI.GOV collections:

Density limits as disruption forecasters for spherical tokamaks

Journal Article Berkery, John W. ; Sabbagh, Steve A. ; Ham, Christopher J. ; ... - Plasma Physics and Controlled Fusion

Fusion power output from spherical tokamaks would benefit from increased confined plasma density, but there exists a limit on the density before confinement is lost and the plasma current is disrupted. This density limit has long been characterized by a simple, global Greenwald limit proportional to the plasma current and inversely proportional to the cross sectional area of the plasma. It is shown that in the database of discharges from the National Spherical Tokamak Experiment (NSTX) and Mega Ampere Spherical Tokamak (MAST) spherical tokamaks, the likelihood of disruption does increase above the Greenwald limit, and especially in the plasma currentmore »« less
Data for "Kinetic-Ballooning-Limited Pedestals in Spherical Tokamak Plasmas"

Dataset Parisi, Jason ; Guttenfelder, W. ; Nelson, A. ; ...
Nonlinear fishbone dynamics in spherical tokamaks

Dataset Wang, Feng ; Fu, G.Y. ; Shen, Wei

Linear and nonlinear kinetic-MHD hybrid simulations have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone instability in spherical tokamak plasmas. Realistic NSTX parameters with finite toroidal rotation were used. The results show that the fishbone is driven by both trapped and passing particles. The instability drive of passing particles is comparable to that of trapped particles in the linear regime. The effects of rotation are destabilizing and a new region of instability appears at higher q min (>1.5) values, q min being the minimum of safety factor profile. In the nonlinear regime, the mode saturatesmore »« less
A Reduced Resistive Wall Mode Kinetic Stability Model for Disruption Forecasting

Dataset Berkery, J.W. ; Sabbagh, S.A. ; Bell, R.E. ; ...

Kinetic modification of ideal stability theory from stabilizing resonances of mode-particle interaction has had success in explaining resistive wall mode (RWM) stability limits in tokamaks. With the goal of real-time stability forecasting, a reduced kinetic stability model has been implemented in the new Disruption Event Characterization and Forecasting (DECAF) code, which has been written to analyze disruptions in tokamaks. The reduced model incorporates parameterized models for ideal limits on beta, a ratio of plasma pressure to magnetic pressure, which are shown to be in good agreement with DCON code calculations. Increased beta between these ideal limits causes a shift inmore »« less
Electromagnetic Particle Injector for Fast Time Response Disruption Mitigation in Tokamaks

Dataset Raman, R ; Lay, W -S ; Jarboe, T R ; ...

A novel, rapid time-response, disruption mitigation system referred to as the Electromagnetic Particle Injector (EPI) is described. This method can accurately deliver the radiative payload to the plasma center on a <10 ms time scale, much faster, and deeper, than what can be achieved using conventional methods. The EPI system accelerates a sabot electromagnetically. The sabot is a metallic capsule that can be accelerated to desired velocities by an electromagnetic impeller. At the end of its acceleration, within 2 ms, the sabot will release a radiative payload, which is composed of low-z granules, or a shell pellet containing smaller pellets.more »« less

Similar Records