Publications related to Integrated Improved Performance with Negative Triangularity

H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D

Plasmas with a negative triangularity shape have been created on the DIII-D tokamak that, despite maintaining standard L-mode edge radial profiles, reach volume averaged pressure levels typical of H-mode scenarios. Within the auxiliary power available for ...

2019

The effect of triangularity on fluctuations in a tokamak plasma

Olivier Sauter, Stefano Coda, Laurie Porte

The effects of plasma shaping, in particular triangularity (d), on temperature fluctuations in the tokamak a configuration variable have been studied using the correlation electron cyclotron emission system. It has been found that, in ohmic discharges with ...

2018

Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV

Stefano Coda, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Antoine Pierre Emmanuel Alexis Merle, Roberto Maurizio, Bernhard Sieglin

This paper reports on experimental observations on TCV with a scan in upper triangularity

{\delta }_{\mathrm{up}}

, including negative triangularity, focusing on the power fall-off length

{\lambda }_{{\rm{q}}}

in L-Mode. The upper triangularity is scann ...

2018

A Row-Column Accessed Dynamic Element Matching DAC Architecture for SAR ADCs

Mustafa Kilic, Selman Ergünay, Yusuf Leblebici

Capacitor mismatch in high resolution Successive Approximation Register (SAR) Analog to Digital Converters (ADCs) causes non-linearity effects that reduce the Spurious-Free Dynamic Range (SFDR). This paper presents a novel dynamic element matching (DEM) te ...

IEEE2018

Pedestal properties of H-modes with negative triangularity using the EPED-CH model

Olivier Sauter, Antoine Pierre Emmanuel Alexis Merle

The EPED model has been designed to predict the pedestal height and width from a minimal set of parameters and using the stability of the pedestal region for global MHD peeling-ballooning (P-B) modes as well as local kinetic ballooning modes (KBMs). This a ...

IOPscience2017

Fixed-Rank Approximation of a Positive-Semidefinite Matrix from Streaming Data

Volkan Cevher, Alp Yurtsever

Several important applications, such as streaming PCA and semidefinite programming, involve a large-scale positive-semidefinite (psd) matrix that is presented as a sequence of linear updates. Because of storage limitations, it may only be possible to retai ...

2017

Plasma shaping effects on tokamak scrape-off layer turbulence

Paolo Ricci, Emmanuel Lanti, Sébastien Jolliet, Fabio Riva

The impact of plasma shaping on tokamak scrape-off layer (SOL) turbulence is investigated. The drift-reduced Braginskii equations are written for arbitrary magnetic geometries, and an analytical equilibrium model is used to introduce the dependence of turb ...

Institute of Physics2017

Geometric formulas for system codes including the effect of negative triangularity

Olivier Sauter

Formulas for the volume, poloidal and toroidal surfaces, poloidal length, plasma current, and hence average poloidal field, are determined using global parameters of tokamak plasmas. Previous formulas did not include systematically the effect of triangular ...

Elsevier2016

Investigating profile stiffness and critical gradients in shaped TCV discharges using local gyrokinetic simulations of turbulent transport

Olivier Sauter, Laurent Villard, Stephan Brunner, Yann Camenen, Alessandro Marinoni, Gabriele Merlo

The experimental observation made on the TCV tokamak of a significant confinement improvement in plasmas with negative triangularity (delta < 0) compared to those with standard positive triangularity has been interpreted in terms of different degrees of pr ...

Iop Publishing Ltd2015

Stability limits for tokamak plasma with negative triangularity

Olivier Sauter, Laurent Villard, Holger Reimerdes, Antoine Pochelon, Andrei Martynov

Negative triangularity tokamak plasmas are subject of an increased interest both in existing experiments and in studies of core physics as well as power handling relevant to the fusion demonstration power reactor. The ideal MHD stability calculations for t ...

European Physical Society2014

Integrated Improved Performance with Negative Triangularity

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H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D

The effect of triangularity on fluctuations in a tokamak plasma

Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV

A Row-Column Accessed Dynamic Element Matching DAC Architecture for SAR ADCs

Pedestal properties of H-modes with negative triangularity using the EPED-CH model

Fixed-Rank Approximation of a Positive-Semidefinite Matrix from Streaming Data

Plasma shaping effects on tokamak scrape-off layer turbulence

Geometric formulas for system codes including the effect of negative triangularity

Investigating profile stiffness and critical gradients in shaped TCV discharges using local gyrokinetic simulations of turbulent transport

Stability limits for tokamak plasma with negative triangularity

Geometric formulas for system codes including the effect of negative triangularity

A Row-Column Accessed Dynamic Element Matching DAC Architecture for SAR ADCs

Plasma shaping effects on tokamak scrape-off layer turbulence

H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D

The effect of triangularity on fluctuations in a tokamak plasma

Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV

Pedestal properties of H-modes with negative triangularity using the EPED-CH model

Investigating profile stiffness and critical gradients in shaped TCV discharges using local gyrokinetic simulations of turbulent transport

Fixed-Rank Approximation of a Positive-Semidefinite Matrix from Streaming Data

Stability limits for tokamak plasma with negative triangularity