All Papers - UKAEA Scientific Publications

Showing 1 - 7 of 7 UKAEA Paper Results

UKAEA-CCFE-PR(25)3042024

"First Access to ELM-free Negative Triangularity at Low Aspect Ratio"
- A.O. Nelson
- C. Vincent
- H. Anand
- J. Lovell
- J.F. Parisi
- H. S. Wilson
- K. Imada
- W.P. Wehner
- M.Kochan
- S. Blackmore
- G. McArdle
- S. Guizzo
- L. Rondini
- S. Freiberger
- C. Paz-Soldan
- the MAST-U Team
A plasma scenario with negative triangularity (NT) shaping is achieved on MAST-U for the first time. While edge localized modes (ELMs) are eventually suppressed as the triangularity is decreased below δ ≲ −0.06, an extended period of H-mode operation with Type-III ELMs is sustained at less negative δ even through access to the second stabilit…
- Preprint
UKAEA-CCFE-PR(25)2932023

"Modeling electron temperature profiles in the pedestal with simple formulas for ETG transport"
This paper reports on the refinement (building on Ref. [1]) and application of simple formulas for electron heat transport from electron temperature gradient (ETG) driven turbulence in the pedestal. The formulas are improved by (1) improving the parameterization for certain key parameters and (2) carefully accounting for the impact of geometry a…
- Published
UKAEA-CCFE-PR(24)2172023

"Pyrokinetics - A Python library to standardise gyrokinetic analysis"
Fusion energy offers the potential for a near limitless source of low-carbon energy and is oftenregarded as a solution for the world’s long-term energy needs. To realise such a scenario requiresthe design of high-performance fusion reactors capable of maintaining the extreme conditionsnecessary to enable fusion. Turbulence …
- Published
UKAEA-CCFE-PR(23)1022021

"The role of slab-ETG modes in JET-ILW pedestals with varying levels of power and fuelling"
We present the results of GENE gyrokinetic calculations based on a series of JET-ILW type I ELMy H-mode discharges operating with similar experimental inputsbut at different levels of power and gas fuelling. We show that turbulence due to slab electron-temperature-gradient modes (sETGs) produces a significant amount of heat flux in four JET-ILW …
- Published
UKAEA-CCFE-PR(22)022021

"Extended electron tails in electrostatic microinstabilities and the nonadiabatic response of passing electrons"
Ion-gyroradius-scale microinstabilities typically have a frequency comparable to the ion transit frequency. Hence, it is conventionally assumed that passing electrons respond adiabatically in ion-gyroradius-scale modes, due to the small electron-to-ion mass ratio and the large electron transit frequency. However, in gyrokinetic simulations of io…
- Preprint
- Published
UKAEA-CCFE-PR(20)212020

"Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals"
- J F Parisi
- F I Parra
- C M Roach
- C Giroud
- W Dorland
- D R Hatch
- M Barnes
- J C Hillesheim
- N Aiba
- J R Ball
- P G Ivanov
Local linear gyrokinetic simulations show that electron temperature gradient (ETG) instabilities are the fastest growing modes for kyρi >~ 0.1 in the steep gradient region for a JET pedestal discharge (92174) where the electron temperature gradient is steeper than the ion temperature gradient. Here, ky is the wa…
- Preprint
- Published
UKAEA-CCFE-CP(20)982018

"Optimization of JET-DT and ITER operation by developing an understanding of the role of low-Z impurity on the H-mode pedestal"
- C. Giroud
- N. Aiba
- F. Militello
- C. Challis
- A. Chankin
- B. Lomanowski
- D. Hatch
- J. Harrison
- D. Frigione
- D. Moulton
- S. Pamela
- F. Parra
- J. Parisi
- I. Putzai
- D. Refy
- S. Saarelma
- C. Stavrou
- B. Tal
- E. Belonohy
- S. Brezinsek
- S. Buller
- C. Bowman
- E. Delabie
- A. Field
- J. Fontdecaba
- A. Huber
- A. Meigs
- S. Menmuir
- J. Simpson
- JET Contributors
- Preprint
- Published

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Browse our papers below.

"First Access to ELM-free Negative Triangularity at Low Aspect Ratio"

"Modeling electron temperature profiles in the pedestal with simple formulas for ETG transport"

"Pyrokinetics - A Python library to standardise gyrokinetic analysis"

"The role of slab-ETG modes in JET-ILW pedestals with varying levels of power and fuelling"

"Extended electron tails in electrostatic microinstabilities and the nonadiabatic response of passing electrons"

"Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals"

"Optimization of JET-DT and ITER operation by developing an understanding of the role of low-Z impurity on the H-mode pedestal"

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