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Title: Isotope physics of heat and particle transport with tritium in JET-ILW type-I ELMy H-mode plasmas

Journal Article · · Nuclear Fusion
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  1. Max-Planck-Institut für Plasmaphysik, Garching (Germany)
  2. Consorzio RFX-CNR, ENEA, INFN, Università di Padova (Italy); CNR-ISTP, Padova (Italy)
  3. Universidade de Lisboa (Portugal); Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
  4. Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association; Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  5. Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
  6. KTH Royal Institute of Technology, Stockholm (Sweden)
  7. University of Oxford (United Kingdom)
  8. Institute of Plasma Physics and Laser Microfusion (IPPLM) Warsaw (Poland)
  9. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  10. Laboratorio Nacional de Fusión Ciemat, Madrid (Spain)
  11. CEA, IRFM, Saint-Paul-lez-Durance (France)
  12. ENEA Centro Ricerche Frascati, Roma (Italy)

As part the DTE2 campaign in the JET tokamak, we conducted a parameter scan in T and D-T complementing existing pulses in H and D. For the different main ion masses, type-I ELMy H-modes at fixed plasma current and magnetic field can have the pedestal pressure varying by a factor of 4 and the total pressure changing from β N = 1.0 to 3.0. We investigated the pedestal and core isotope mass dependencies using this extensive data set. The pedestal shows a strong mass dependence on the density, which influences the core due to the strong coupling between both plasma regions. To better understand the causes for the observed isotope mass dependence in the pedestal, we analysed the interplay between heat and particle transport and the edge localised mode (ELM) stability. For this purpose, we developed a dynamic ELM cycle model with basic transport assumptions and a realistic neutral penetration. The temporal evolution and resulting ELM frequency introduce an additional experimental constraint that conventional quasi-stationary transport analysis cannot provide. Our model shows that a mass dependence in the ELM stability or in the transport alone cannot explain the observations. One requires a mass dependence in the ELM stability as well as one in the particle sources. The core confinement time increases with pedestal pressure for all isotope masses due to profile stiffness and electromagnetic turbulence stabilisation. Interestingly, T and D-T plasmas show an improved core confinement time compared to H and D plasmas even for matched pedestal pressures. For T, this improvement is largely due to the unique pedestal composition of higher densities and lower temperatures than H and D. With a reduced gyroBohm factor at lower temperatures, more turbulent drive in the form of steeper gradients is required to transport the same amount of heat. This picture is supported by quasilinear flux-driven modelling using TGLF-SAT2 within Astra. With the experimental boundary condition TGLF-SAT2 predicts the core profiles well for gyroBohm heat fluxes > 15 , however, overestimates the heat and particle transport closer to the turbulent threshold.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE; Engineering and Physical Sciences Research Council (EPSRC)
Contributing Organization:
JET Contributors
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
2217304
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 63; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

References (96)

Calculation and experimental test of the cooling factor of tungsten journal January 2010
A high-accuracy Eulerian gyrokinetic solver for collisional plasmas journal November 2016
Dimensionless parameter dependence of H-mode pedestal width using hydrogen and deuterium plasmas in JT-60U journal March 2008
Gyroradius Scaling of Electron and Ion Transport journal March 1995
A new quasilinear saturation rule for tokamak turbulence with application to the isotope scaling of transport journal July 2022
Enhanced Doppler reflectometry power response: physical optics and 2D full wave modelling journal February 2017
Global performance enhancements via pedestal optimisation on ASDEX Upgrade journal December 2016
Operational aspects of the JET tritium introduction modules journal November 2017
Role of the separatrix density in the pedestal performance in deuterium low triangularity JET-ILW plasmas and comparison with JET-C journal November 2021
Edge turbulent transport toward the L–H transition in ASDEX Upgrade and JET-ILW journal May 2021
Fast-ion pressure dominating the mass dependence of the core heat transport in ASDEX Upgrade H-modes journal February 2021
Comparison of time dependent simulations with experiments in ion cyclotron heated plasmas journal July 1993
The power threshold of H-mode access in mixed hydrogen–tritium and pure tritium plasmas at JET with ITER-like wall journal May 2022
Microturbulence study of the isotope effect journal January 2015
Effect of the isotope mass on pedestal structure, transport and stability in D, D/T and T plasmas at similar β N and gas rate in JET-ILW type I ELMy H-modes journal October 2023
Limits to the H-mode pedestal pressure gradient in DIII-D journal May 2010
Overview of L- to H-mode transition experiments at ASDEX Upgrade journal December 2022
Explaining the isotope effect on heat transport in L-mode with the collisional electron-ion energy exchange journal April 2017
Isotope and fast ions turbulence suppression effects: Consequences for high-β ITER plasmas journal May 2018
The global version of the gyrokinetic turbulence code GENE journal August 2011
Differences in the H-mode pedestal width of temperature and density journal August 2012
Characteristics of the H-mode pedestal in improved confinement scenarios in ASDEX Upgrade, DIII-D, JET and JT-60U journal June 2007
New assessment of the fast ion energy in ASDEX upgrade H-mode discharges journal February 2021
Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW hydrogen and deuterium plasmas journal March 2021
Role of fast ion pressure in the isotope effect in JET L-mode plasmas journal July 2019
Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas journal June 2007
The influence of isotope mass, edge magnetic shear and input power on high density ELMy H modes in JET journal September 1999
Non-inductively driven currents in JET journal April 1989
Application of dimensionless parameter scaling techniques to the design and interpretation of magnetic fusion experiments journal March 2008
Collisionality and shear dependences of density peaking in JET and extrapolation to ITER journal January 2005
A novel approach to correlation reflectometry journal October 2011
Overview of density pedestal structure: role of fueling versus transport journal July 2020
Verification of a quasi-linear model for gyrokinetic turbulent transport journal September 2021
Density Peaking, Anomalous Pinch, and Collisionality in Tokamak Plasmas journal May 2003
X mode Doppler reflectometry k -spectral measurements in ASDEX Upgrade: experiments and simulations journal May 2017
Physics of pedestal density profile formation and its impact on H-mode density limit in burning plasmas journal October 2003
Spatial resolution of the JET Thomson scattering system journal January 2012
Hydrogen isotope effects on ITG scale length, pedestal and confinement in JT-60 H-mode plasmas journal July 2013
Validation of IMEP on Alcator C-Mod and JET-ILW ELMy H-mode plasmas journal January 2023
L-H transition studies in tritium and deuterium–tritium campaigns at JET with Be wall and W divertor journal October 2023
Profile stiffness and global confinement journal July 2004
Fast dynamics of type I and grassy ELMs in JT-60U journal September 2009
Particle pinch and collisionality in gyrokinetic simulations of tokamak plasma turbulence journal June 2009
Pedestal study across a deuterium fuelling scan for high δ ELMy H-mode plasmas on JET with the carbon wall journal July 2013
Physics and scaling of the H-mode pedestal journal May 2000
Strong Isotope Effect in Energy Confinement at the FT-2 Tokamak journal December 2019
The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium journal October 2023
Isotope effects on L-H threshold and confinement in tokamak plasmas journal November 2017
Inter-ELM behaviour of the electron density and temperature pedestal in ASDEX Upgrade journal September 2010
Numerical studies of edge localized instabilities in tokamaks journal April 2002
Experimental study on the role of the target electron temperature as a key parameter linking recycling to plasma performance in JET-ILW* journal April 2022
Pedestal structure and inter-ELM evolution for different main ion species in ASDEX Upgrade journal May 2017
Thermal ions dilution and ITG suppression in ASDEX Upgrade ion ITBs journal March 2007
The dependence of confinement on the isotope mass in the core and the edge of AUG and JET-ILW H-mode plasmas journal December 2021
Instrumentation for the upgrade to the JET core charge-exchange spectrometers journal October 2018
Isotopic scaling of confinement in deuterium–tritium plasmas journal June 1995
The isotope effect in ASDEX journal August 1993
Geodesic acoustic modes in magnetic confinement devices journal December 2021
Analysis of temperature and density pedestal gradients in AUG, DIII-D and JET journal June 2013
Density peaking in JET—determined by fuelling or transport? journal October 2019
Tritium neutral beam injection on JET: calibration and plasma measurements of stored energy journal October 2023
Isotope identity experiments in JET-ILW with H and D L-mode plasmas journal June 2019
Impurity transport in tokamak plasmas, theory, modelling and comparison with experiments journal May 2021
Implementation of SOLPS-ITER code with new Grad–Zhdanov module for D–T mixture journal January 2023
Plasma confinement in JET H mode plasmas with H, D, DT and T isotopes journal March 1999
Scaling studies of the high mode pedestal journal May 1998
Magnetic-field scaling of dimensionally similar tokamak discharges journal November 1990
Gyrokinetic nonlinear isotope effects in tokamak plasmas journal December 2016
JET D-T scenario with optimized non-thermal fusion journal October 2023
Electron heat transport studies journal November 2006
Identification of plasma-edge-related operational regime boundaries and the effect of edge instability on confinement in ASDEX Upgrade journal December 1997
The ‘hybrid’ scenario in JET: towards its validation for ITER journal June 2005
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library journal June 2004
Density profile peaking in low collisionality H-modes: comparison of Alcator C-Mod data to ASDEX Upgrade/JET scalings journal August 2007
Ion heat transport dynamics during edge localized mode cycles at ASDEX Upgrade journal January 2018
Key impact of finite-beta and fast ions in core and edge tokamak regions for the transition to advanced scenarios journal April 2015
The role of the source versus the collisionality in predicting a reactor density profile as observed on ASDEX Upgrade discharges journal June 2019
Novel free-boundary equilibrium and transport solver with theory-based models and its validation against ASDEX Upgrade current ramp scenarios journal November 2013
Isotope dependence of energy, momentum and particle confinement in tokamaks journal September 2020
Reversal of turbulent gyroBohm isotope scaling due to nonadiabatic electron drive journal August 2019
Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas journal May 2020
Progress towards a predictive model for pedestal height in DIII-D journal July 2009
Effect of resistivity on the pedestal MHD stability in JET journal October 2022
Integrated modeling of ASDEX Upgrade plasmas combining core, pedestal and scrape-off layer physics journal February 2020
Isotope mass scaling and transport comparison between JET Deuterium and Tritium L-mode plasmas journal October 2023
Overview of the isotope effects in the ASDEX Upgrade tokamak journal May 2021
Improved confinement in JET high β plasmas with an ITER-like wall journal April 2015
Non-boronized compared with boronized operation of ASDEX Upgrade with full-tungsten plasma facing components journal March 2009
Pedestal confinement and stability in JET-ILW ELMy H-modes journal September 2015
Isotope mass dependence of pedestal transport in JET H-mode plasmas journal February 2023
Modelling and theoretical understanding of the isotope effect from JET experiments in view of reliable predictions for deuterium-tritium plasmas journal March 2022
Isotope Effect and Multiscale Physics in Fusion Plasmas journal June 2013
Effect of the isotope mass on the turbulent transport at the edge of L-mode plasmas in ASDEX Upgrade and JET-ILW journal October 2019
Modelling of plasma performance and transient density behaviour in the H-mode access for ITER gas fuelled scenarios journal August 2015
Dependence of the turbulent particle flux on hydrogen isotopes induced by collisionality journal August 2018
Validation of D–T fusion power prediction capability against 2021 JET D–T experiments journal October 2023