0000000001256574

AUTHOR

D. Wood

showing 8 related works from this author

Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating

2017

We describe a new technique for the efficient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed ‘three-ion’ scenarios are especially suited for strong wave absorption by a very low number of resonant ions. To observe this effect, the plasma composition has to be properly adjusted, as prescribed by theory. We demonstrate the potential of the method on the world-largest plasma magnetic confinement device, JET (Joint European Torus, Culham, UK), and the high-magnetic-field tokamak Alcator C-Mod (Cambridge, USA). The obtained results demonstrate efficient acceleration of 3He ions to high energies in dedicated hydrogen–deuterium mixtures.…

Astrophysical plasmasTokamakradio-frequency heatingCyclotronJoint European TorusPlasma heatingGeneral Physics and AstronomyFREQUENCY114 Physical sciences01 natural sciences7. Clean energyMagnetically confined plasmas010305 fluids & plasmaslaw.inventionIonPHYSICSPhysics and Astronomy (all)FUSIONMODE CONVERSIONlawPhysics::Plasma Physics0103 physical sciencesDielectric heating010306 general physicsPhysics[PHYS]Physics [physics]ta114Solar flare:Física [Àrees temàtiques de la UPC]Plasma dynamicsmulti-ion plasmasSettore FIS/01 - Fisica SperimentaleMagnetic confinement fusionPlasmaHE-3-RICH SOLAR-FLARESTècniques de plasmaJETCYCLOTRON RANGETOKAMAKPhysics::Space PhysicsAtomic physicsHE-3-RICH SOLAR-FLARES; MODE CONVERSION; CYCLOTRON RANGE; FUSION; JET; FREQUENCY; TOKAMAK; PHYSICS
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Novel method for determination of tritium depth profiles in metallic samples

2019

Tritium accumulation in fusion reactor materials is considered a serious radiological issue, therefore a lot of effort has been concentrated on the development of radiometric techniques. A novel method, based on gradual dissolution, for the determination of the total tritium content and its depth profiles in metallic samples is demonstrated. This method allows for the measurement of tritium in metallic samples after their exposure to a hydrogen and tritium mixture, tritium containing plasma or after irradiation with neutrons resulting in tritium formation. In this method, successive layers of metal are removed using an appropriate etching agent in the controlled regime and the amount of evo…

inorganic chemicalsfusionNuclear and High Energy PhysicsMaterials scienceNuclear engineeringchemistry.chemical_elementheliumBlanket114 Physical sciences01 natural sciences010305 fluids & plasmasblanketMetalirradiated berylliumjet0103 physical sciencespolycyclic compounds010306 general physicsHeliumbreeding blanketJet (fluid)Fusiontritiumbehaviororganic chemicalshydrogen diffusiontemperatureiter-like-wallFusion powerfirst wallberylliumCondensed Matter Physicschemistryvisual_arttransportcardiovascular systemvisual_art.visual_art_mediumdepth profileTritiumBerylliumNuclear Fusion
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Overview of the JET results

2015

Since the installation of an ITER-like wall, the JET programme has focused on the consolidation of ITER design choices and the preparation for ITER operation, with a specific emphasis given to the bulk tungsten melt experiment, which has been crucial for the final decision on the material choice for the day-one tungsten divertor in ITER. Integrated scenarios have been progressed with the re-establishment of long-pulse, high-confinement H-modes by optimizing the magnetic configuration and the use of ICRH to avoid tungsten impurity accumulation. Stationary discharges with detached divertor conditions and small edge localized modes have been demonstrated by nitrogen seeding. The differences in…

Chemical analysiMagnetic confinementEdge localized modeTokamak:Física [Ciências exactas e naturais]Nuclear engineeringplasma-facing componentsTungsten7. Clean energyiter-like walllaw.inventionheat loadsAlcator C-ModlawPlasma-facing componentalcator C-MODQCPhysicsJet (fluid)Thermally activatedDivertormagnetic confinementMagnetic confinement fusionTokamak deviceerosionCondensed Matter PhysicsChemical erosionPost mortem analysiCondensed Matter Physics; Nuclear and High Energy PhysicsBerylliumAtomic physicstokamaksTokamaksNuclear and High Energy Physicschemistry.chemical_elementImpurity accumulationCondensed Matter PhysicNuclear and High Energy Physics; Condensed Matter PhysicsTungstenFísica Física:Physical sciences [Natural sciences]divertorNuclear fusionNuclear and High Energy PhysicPhysics Physical sciencesGas fuel analysifuel retentionSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)operationOrders of magnitudechemistryJETtransportMagnetic configuration
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SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

2021

Abstract Background Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18–49, 50–69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results NNVs were more favourable in su…

MaleCOVID-19 Vaccinesafe surgery; vaccination modelling; COVID-19Vascular damage Radboud Institute for Health Sciences [Radboudumc 16]MULTICENTERComorbidity030230 surgery0302 clinical medicinephase 3 clinical trial (topic)Case fatality rateProspective StudiesSARS-CoV-2 Vaccination Safe surgeryCOVID-19/epidemiologySARS-CoV-2 ; vaccination ; safe surgeryeducation.field_of_studycase fatality rateVaccinationVaccinationAdolescent; Adult; Aged; COVID-19; COVID-19 Vaccines; Comorbidity; Elective Surgical Procedures; Female; Humans; Male; Middle Aged; Postoperative Complications; Preoperative Period; Prospective Studies; SARS-CoV-2; Vaccination; Young Adulthealth care policyElective Surgical Procedures030220 oncology & carcinogenesisvaccination modellingPreoperative PeriodCOVID-19; SARS-CoV-2; cancer; vaccination; outcome; mortality; infection; modellingCohort studyprospective studyHumanmedicine.medical_specialtyArticle03 medical and health sciencesSARS-CoV-2 vaccinationSDG 3 - Good Health and Well-beingCOVID-19 Vaccines/pharmacologyHumansVaccination/methodsElective surgeryeducationAgedScience & TechnologyElective Surgical Procedureadult; aged; Article; cancer grading; cancer surgery; case fatality rate; computer assisted tomography; elective surgery; female; follow up; health care policy; human; incidence; infection rate; infection risk; major clinical study; male; middle aged; mortality; outcome assessment; phase 3 clinical trial (topic); preoperative care; prospective study; sensitivity analysis; seroprevalence; Severe acute respiratory syndrome coronavirus 2; vaccination; young adult; COVID-19; COVID-19 Vaccines; Comorbidity; Elective Surgical Procedures; Postoperative Complications; Preoperative Period; SARS-CoV-2; Vaccination; surgery.Cura preoperatòriamajor clinical studymortalityinfectionProspective StudieincidenceSurgeryHuman medicinePostoperative Complication610 Medizin und GesundheitAcademicSubjects/MED00910Settore MED/18 - CHIRURGIA GENERALESettore MED/29 - CHIRURGIA MAXILLOFACCIALEcomputer assisted tomographyESTUDOS PROSPECTIVOSsurgerysafe surgeryPostoperative Complicationssensitivity analysisSevere acute respiratory syndrome coronavirus 2preoperative careVacunacióProspective cohort studyseroprevalenceIncidence (epidemiology)covidElective Surgical Procedures/methodsMiddle Agedcancer gradingCOVID vaccinationoutcome/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_beingSARS-CoV-2; vaccination; surgeryOriginal ArticleFemalecancer surgeryAcademicSubjects/MED00010Life Sciences & BiomedicineAdultCOVID-19 VaccinesAdolescentinternational prospective cohort studyPostoperative Complications/prevention & controlPopulationinfection rateSARS-CoV-2/immunologyNOmodellingYoung Adultmedicinefollow upcancerddc:610infection riskoutcome assessmentLS7_4business.industrySARS-CoV-2Number needed to vaccinatePreoperative careCOVID-193126 Surgery anesthesiology intensive care radiologySettore MED/18Reconstructive and regenerative medicine Radboud Institute for Health Sciences [Radboudumc 10]elective surgeryEmergency medicinebusiness[SDV.MHEP]Life Sciences [q-bio]/Human health and pathologyThe British Journal of Surgery
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Progression From Paroxysmal to Persistent Atrial Fibrillation. Clinical Correlates and Prognosis

2010

Objectives: We investigated clinical correlates of atrial fibrillation (AF) progression and evaluated the prognosis of patients demonstrating AF progression in a large population. Background: Progression of paroxysmal AF to more sustained forms is frequently seen. However, not all patients will progress to persistent AF. Methods: We included 1,219 patients with paroxysmal AF who participated in the Euro Heart Survey on AF and had a known rhythm status at follow-up. Patients who experienced AF progression after 1 year of follow-up were identified. Results: Progression of AF occurred in 178 (15%) patients. Multivariate analysis showed that heart failure, age, previous transient ischemic attac…

MaleTime FactorPrognosiRisk FactorpredictionMiddle AgedRisk AssessmentSeverity of Illness IndexAtrial FibrillationDisease ProgressionepidemiologyFemaleatrial fibrillation; epidemiology; prediction; prognosis; progression; Aged; Atrial Fibrillation; Female; Humans; Male; Middle Aged; Prognosis; Risk Assessment; Risk Factors; Severity of Illness Index; Time Factors; Disease ProgressionprogressionAgedHuman
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Impact of clinical phenotypes on management and outcomes in European atrial fibrillation patients: a report from the ESC-EHRA EURObservational Resear…

2021

Abstract Background Epidemiological studies in atrial fibrillation (AF) illustrate that clinical complexity increase the risk of major adverse outcomes. We aimed to describe European AF patients’ clinical phenotypes and analyse the differential clinical course. Methods We performed a hierarchical cluster analysis based on Ward’s Method and Squared Euclidean Distance using 22 clinical binary variables, identifying the optimal number of clusters. We investigated differences in clinical management, use of healthcare resources and outcomes in a cohort of European AF patients from a Europe-wide observational registry. Results A total of 9363 were available for this analysis. We identified three …

RegistrieResearch Reportmedicine.medical_specialtyMajor adverse outcomeCardiovascular risk factorsCluster analysisRisk FactorsInternal medicineClinical phenotypeAtrial FibrillationEpidemiologyHumansMedicineRegistriesCluster analysiAtrial fibrillation; Clinical management; Clinical phenotypes; Cluster analysis; Major adverse outcomes; Humans; Phenotype; Registries; Research Report; Risk Factors; Atrial FibrillationClinical managementbusiness.industryProportional hazards modelRisk FactorHazard ratioRAtrial fibrillationClinical phenotypesMajor adverse outcomesGeneral Medicinemedicine.diseaseAtrial fibrillationConfidence intervalPhenotypeCohortMedicineObservational studybusinessResearch ArticleHumanBMC Medicine
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Comparison of the structure of the plasma-facing surface and tritium accumulation in beryllium tiles from JET ILW campaigns 2011-2012 and 2013-2014

2019

In this study, beryllium tiles from Joint European Torus (JET) vacuum vessel wall were analysed and compared regarding their position in the vacuum vessel and differences in the exploitation conditions during two campaigns of ITER-Like-Wall (ILW) in 2011-2012 (ILW1) and 2013-2014 (ILW2) Tritium content in beryllium samples were assessed. Two methods were used to measure tritium content in the samples - dissolution under controlled conditions and tritium thermal desorption. Prior to desorption and dissolution experiments, scanning electron microscopy and energy dispersive x-ray spectroscopy were used to study structure and chemical composition of plasma-facing-surfaces of the beryllium sampl…

Fuel retentionPhysics::Medical Physics01 natural sciencesQuantitative Biology::Cell Behavior010305 fluids & plasmasiter-like walljoint european torusRETENTION010302 applied physicsJet (fluid)tritiumPhysicsMechanicsSurface (topology)Fusion Plasma and Space Physicslcsh:TK9001-9401surgical procedures operativecardiovascular systemJoint European TorusTritiumBerylliumBerylliumNuclear and High Energy PhysicsretentionTechnology and Engineeringanimal structuresMaterials scienceQuantitative Biology::Tissues and OrgansMaterials Science (miscellaneous)Joint European Toruschemistry.chemical_elementTritium114 Physical sciencesGeneral Relativity and Quantum CosmologyFusion plasma och rymdfysik0103 physical sciencesddc:530ITER-LIKE-WALLITER-like walltechnology industry and agriculturePlasmaiter-like-wallberylliumTRANSPORTfuel retentionbody regionsNuclear Energy and Engineeringchemistrytransportlcsh:Nuclear engineering. Atomic power
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Modelling of JET hybrid plasmas with emphasis on performance of combined ICRF and NBI heating

2018

International audience; During the 2015--2016 JET campaigns, many efforts have been devoted to the exploration of high-performance plasma scenarios envisaged for DT operation in JET. In this paper, we review various key recent hybrid discharges and model the combined ICRF NBI heating. These deuterium discharges with deuterium beams had the ICRF antenna frequency tuned to match the cyclotron frequency of minority H at the centre of the tokamak coinciding with the second harmonic cyclotron resonance of D. The modelling takes into account the synergy between ICRF and NBI heating through the second harmonic cyclotron resonance of D beam ions, allowing us to assess its impact on the neutron rate…

Nuclear and High Energy PhysicsLight nucleusfusionPlasma heatingicrf heatingNuclear engineeringion-cyclotron rangeCyclotronJET hybrid plasmaICRF heating; NBI heating; JET hybrid plasmas; fusion enhancement; ION-CYCLOTRON RANGE; ENHANCEMENT; FUSION7. Clean energy01 natural sciences010305 fluids & plasmaslaw.inventionICRF heatingfusion enhancementdt plasmaslawNBI heating0103 physical sciences010306 general physicsjet hybrid plasmastokamakenhancementfusion enhancement; ICRF heating; JET hybrid plasmas; NBI heatingnbi heatingJet (fluid)Emphasis (telecommunications)PlasmaCondensed Matter PhysicsJET hybrid plasmasSettore ING-IND/20 - Misure e Strumentazione NucleariresonanceEnvironmental science[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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