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Liang Yao

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Related publications (158)

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Testing of tritium breeder blanket activation foil spectrometer during JET operations

Olivier Sauter, Martinus Adela Maria Gijs, Jonathan Graves, Ambrogio Fasoli, Stefano Coda, Basil Duval, Henri Weisen, Richard Pitts, Yves Martin, Javier García Hernández, Duccio Testa, Miguel Fernández Ruiz, Nicola Vianello, Robin Humphry-Baker, Sun Hee Kim, Federico Nespoli, Patrick Blanchard, Alessandro Pau, David Pfefferlé, Davide Galassi, Jonathan Marc Philippe Faustin, Cristian Sommariva, Hamish William Patten, Samuel Lanthaler, Jan Horacek, Yann Camenen, Bruno Emanuel Ferreira De Sousa Correia, José Pedro Rebelo Ferreira Marques, Mikhail Maslov, Marco Wischmeier, Dalziel Joseph Wilson, Liang Yao, Daniel Scott Alessi, Arnout Lodewijk M Beckers, Ana Francisca Leal Silva Soares, Jonnathan Cesar Hidalgo Acosta, Antonio José Pereira de Figueiredo, Partha Dutta, Pierre-Thomas Paul Brun, Pedro Camilo de Oliveira e Silva, Alberto Hernando de Castro, Julio Rodriguez, Vlad Trifa, Li Shuai, Rebecca Hill

Accurate measurement of the nuclear environment within a test tritium breeding-blanket module of a fusion reactor is crucial to determine tritium production rates which are relevant to self-sufficiency of tritium fuel supply, tritium accountancy and also t ...

2018

Light impurity transport in JET ILW L-mode plasmas

A series of experimental observations of light impurity profiles was carried out in JET (Joint European Torus) ITER-like wall (ILW) L-mode plasmas in order to investigate their transport mechanisms. These discharges feature the presence of He-3, Be, C, N, ...

IOP Publishing Ltd2018

Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating

Measurements are reported of electromagnetic emission close to the cyclotron frequency of energetic ions in JET plasmas heated by waves in the ion cylotron range of frequencies (ICRF). Hydrogen was the majority ion species in all of these plasmas. The meas ...

IOP Publishing Ltd2018

On the Use of Transfer Entropy to Investigate the Time Horizon of Causal Influences between Signals

Understanding the details of the correlation between time series is an essential step on the route to assessing the causal relation between systems. Traditional statistical indicators, such as the Pearson correlation coefficient and the mutual information, ...

2018

Sub-millisecond electron density profile measurement at the JET tokamak with the fast lithium beam emission spectroscopy system

Diagnostic alkali atom (e.g., lithium) beams are routinely used to diagnose magnetically confined plasmas, namely, to measure the plasma electron density profile in the edge and the scrape off layer region. A light splitting optics system was installed int ...

2018

Investigation of deuterium trapping and release in the JET divertor during the third ILW campaign using TDS

Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Stefano Coda, Basil Duval, Henri Weisen, Yves Martin, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Nicola Vianello, Mikhail Maslov, Federico Nespoli, Patrick Blanchard, Alessandro Pau, Davide Galassi, Liang Yao, Dalziel Joseph Wilson, Cristian Sommariva, Jonathan Graves, Antonio José Pereira de Figueiredo, Hamish William Patten, Samuel Lanthaler, David Pfefferlé, Jonathan Marc Philippe Faustin

Selected set of samples from JET ITER-Like Wall (JET-ILW) divertor tiles exposed in 2015-2016 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts obtained with TDS were compared with Nuclear Reaction Analysis (NRA). The ...

Elsevier2019

Divertor currents optimization procedure for JET-ILW high flux expansion experiments

This paper deals with a divertor coil currents optimized procedure to design High Flux Expansion (HFE) configurations in the JET tokamak aimed to study the effects of flux expansion variation on the radiation fraction and radiated power re-distribution. A ...

2018

Instrumentation for the upgrade to the JET core charge-exchange spectrometers

Charge-exchange spectroscopy on JET has become particularly challenging with the introduction of the ITER-like wall. The line intensities are weaker and contaminated by many nuisance lines. We have therefore upgraded the instrumentation to improve throughp ...

2018

High Z neoclassical transport: Application and limitation of analytical formulae for modelling JET experimental parameters

Heavy impurities, such as tungsten (W), can exhibit strongly poloidally asymmetric density profiles in rotating or radio frequency heated plasmas. In the metallic environment of JET, the poloidal asymmetry of tungsten enhances its neoclassical transport up ...

2018

Neutron spectroscopy measurements of 14 MeV neutrons at unprecedented energy resolution and implications for deuterium-tritium fusion plasma diagnostics

Olivier Sauter, Jonathan Graves, Ambrogio Fasoli, Stefano Coda, Basil Duval, Henri Weisen, Patrick Blanchard, Richard Pitts, Yves Martin, Javier García Hernández, Duccio Testa, Sun Hee Kim, Alessandro Pau, Davide Galassi, Jonathan Marc Philippe Faustin, Liang Yao, Jan Horacek, Yann Camenen, Bruno Emanuel Ferreira De Sousa Correia, Mikhail Maslov, Marco Wischmeier, Dalziel Joseph Wilson, Daniel Scott Alessi, Jonnathan Cesar Hidalgo Acosta, Antonio José Pereira de Figueiredo, Vlad Trifa, Federico Nespoli, Hamish William Patten, Samuel Lanthaler, David Pfefferlé, Albano António De Abreu E Presa De Castro E Sousa, Alexis Gérald Page, Janir Nuno Ramos Antunes Da Cruz, Nicola Vianello, Cristian Sommariva, Tao Xu, Thomas Willem Jan de Geus, Paulo Giovane Paschoali Pereira Puglia, Mario Joe Lehmann, Jose Vicente Sanchez Mut, Joao André Gomes de Sá e Sousa, Jose Felix Vega Stavro, Lorenzo Anton-Louis Talà, Pamela Solange Valdés Undurraga, Wei Zhang, Lenke Horváth, Matthew Brown, Hugo Antoine Georges Arnichand, Wei Tang, Luis David Figueiredo Mascarenhas Moreira Pedrosa, Philippe Janson, Lyne Moser, Stéphanie Prior, Stefano Mattei, Daniel Molina Romero, Riccardo Vannucci, Candice Megan T Young, Petre Alexandru Arion, Justin Robert Young, Gil Corbaz, Hugo Augusto Penedones Fernandes, Philippe Jean Buchs, Alejandro Santa Cruz Paz

An accurate calibration of the JET neutron diagnostics with a 14 MeV neutron generator was performed in the first half of 2017 in order to provide a reliable measurement of the fusion power during the next JET deuterium-tritium (DT) campaign. In order to m ...

IOP Publishing2018

Micro ion beam analysis for the erosion of beryllium marker tiles in a tokamak limiter

Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Stefano Coda, Basil Duval, Henri Weisen, Yves Martin, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Federico Nespoli, Patrick Blanchard, David Pfefferlé, Antonio José Pereira de Figueiredo, Jonathan Marc Philippe Faustin, Liang Yao, Dalziel Joseph Wilson, Jonathan Graves, Mikhail Maslov, Joan Decker, Andrea Scarabosio, Cristian Galperti, Gilles Arnoux

Beryllium limiter marker tiles were exposed to plasma in the Joint European Torus to diagnose the erosion of main chamber wall materials. A limiter marker tile consists of a beryllium coating layer (7-9 mu m) on the top of bulk beryllium, with a nickel int ...

2019

Establishing Stability in Organic Semiconductor Photocathodes for Solar Hydrogen Production

Kevin Sivula, Jun Ho Yum, Liang Yao, Nestor Guijarro Carratala, Florian Le Formal, Yongpeng Liu, Florent Alexandre Boudoire, Muhammad Aiman Bin Rahmanudin Hamdan, Arvindh Sekar, Rebekah Anne Wells, Han-Hee Cho

As organic semiconductors attract increasing attention to application in the fields of bioelectronics and artificial photosynthesis, understanding the factors that determine their robust operation in direct contact with aqueous electrolytes becomes a criti ...

AMER CHEMICAL SOC2020

The upgraded JET gamma-ray cameras based on high resolution/high count rate compact spectrometers

The JET gamma-ray cameras have been recently upgraded within the gamma-ray camera upgrade project in support of development of JET high performance deuterium plasma scenarios and in preparation of deuterium-tritium experiments. New, dedicated detectors bas ...

2018

Molecular ND Band Spectroscopy in the Divertor Region of Nitrogen Seeded JET Discharges

In this contribution we present OES measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production. The observation region covers most of the divertor and its ...

IOP PUBLISHING LTD2018

Cu2O photocathodes with band-tail states assisted hole transport for standalone solar water splitting

Michael Graetzel, Ulf Anders Hagfeldt, Kevin Sivula, Liang Yao, Yuhang Liu, Dan Ren, Linfeng Pan

Photoelectrochemical water splitting provides a promising solution for harvesting and storing solar energy. As the best-performing oxide photocathode, the Cu2O photocathode holds the performance rivaling that of many photovoltaic semiconductor-based photoc ...

Nature Research2020

Analysis of plasma termination in the JET hybrid scenario

Olivier Sauter, Richard Pitts, Jonathan Graves, Ambrogio Fasoli, Stefano Coda, Yves Martin, Basil Duval, Henri Weisen, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Miguel Fernández Ruiz, Nicola Vianello, Robin Humphry-Baker, Sun Hee Kim, Federico Nespoli, Patrick Blanchard, Alessandro Pau, David Pfefferlé, Davide Galassi, Jonathan Marc Philippe Faustin, Liang Yao, Dalziel Joseph Wilson, Cristian Sommariva, Hamish William Patten, Samuel Lanthaler, José Pedro Rebelo Ferreira Marques, Mikhail Maslov, Daniel Scott Alessi, Ana Francisca Leal Silva Soares, Jonnathan Cesar Hidalgo Acosta, Antonio José Pereira de Figueiredo, Partha Dutta, Pierre-Thomas Paul Brun, Pedro Camilo de Oliveira e Silva, Alberto Hernando de Castro, Julio Rodriguez, Vlad Trifa, Rebecca Hill

This paper analyses the final phase of hybrid scenario discharges at JET, the reduction of auxiliary heating towards finally the Ohmic phase. The here considered Ohmic phase is mostly still in the current flattop but may also be in the current ramp down. F ...

IOP Publishing Ltd2018

High-resolution tungsten spectroscopy relevant to the diagnostic of high-temperature tokamak plasmas

Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Stefano Coda, Yves Martin, Basil Duval, Henri Weisen, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Nicola Vianello, Mikhail Maslov, Patrick Blanchard, Alessandro Pau, Davide Galassi, Antonio José Pereira de Figueiredo, Liang Yao, Dalziel Joseph Wilson, Cristian Sommariva, Jonathan Graves, Federico Nespoli, Hamish William Patten, Samuel Lanthaler, David Pfefferlé, Jonathan Marc Philippe Faustin, Yang Zou

The x-ray transitions in Cu- and Ni-like tungsten ions in the 5.19-5.26 angstrom wavelength range that are relevant as a high-temperature tokamak diagnostic, in particular for JET in the ITER-like wall configuration, have been studied. Tungsten spectra wer ...

2018

Determination of isotope ratio in the divertor of JET-ILW by high-resolution H alpha spectroscopy: H-D experiment and implications for D-T experiment

Olivier Sauter, Ambrogio Fasoli, Basil Duval, Richard Pitts, Stefano Coda, Yves Martin, Henri Weisen, Patrick Blanchard, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Nicola Vianello, Mikhail Maslov, Alessandro Pau, Davide Galassi, Antonio José Pereira de Figueiredo, Liang Yao, Dalziel Joseph Wilson, Cristian Sommariva, Jonathan Graves, Federico Nespoli, Hamish William Patten, Samuel Lanthaler, David Pfefferlé, Jonathan Marc Philippe Faustin, Stéphanie Prior

The data of the H alpha high-resolution spectroscopy, collected on the multiple lines of sight, which cover the entire divertor space in poloidal cross-section, during the recent hydrogen-deuterium experiments in JET-ILW (ITER-like wall), are processed. A ...

IOP Publishing Ltd2019

Neutron emission spectroscopy of D plasmas at JET with a compact liquid scintillating neutron spectrometer

Neutron emission spectroscopy is a diagnostic technique that allows for energy measurements of neutrons born in nuclear reactions. The JET tokamak fusion experiment (Culham, UK) has a special role in this respect as advanced spectrometers for 2.5 MeV and 1 ...

2018

Bayesian Integrated Data Analysis of Fast-Ion Measurements by Velocity-Space Tomography

Bayesian integrated data analysis combines measurements from different diagnostics to jointly measure plasma parameters of interest such as temperatures, densities, and drift velocities. Integrated data analysis of fast-ion measurements has long been hampe ...

2018