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- 2018
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:1
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Forskningsöversikt (refereegranskat)
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| 2. |
- Bombarda, F., et al.
(författare)
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Runaway electron beam control
- 2019
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Ingår i: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 1361-6587 .- 0741-3335. ; 61:1
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Tidskriftsartikel (refereegranskat)
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- Krasilnikov, A., et al.
(författare)
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Evidence of 9 Be + p nuclear reactions during 2ω CH and hydrogen minority ICRH in JET-ILW hydrogen and deuterium plasmas
- 2018
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:2
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Tidskriftsartikel (refereegranskat)abstract
- The intensity of 9Be + p nuclear fusion reactions was experimentally studied during second harmonic (2ω CH) ion-cyclotron resonance heating (ICRH) and further analyzed during fundamental hydrogen minority ICRH of JET-ILW hydrogen and deuterium plasmas. In relatively low-density plasmas with a high ICRH power, a population of fast H+ ions was created and measured by neutral particle analyzers. Primary and secondary nuclear reaction products, due to 9Be + p interaction, were observed with fast ion loss detectors, γ-ray spectrometers and neutron flux monitors and spectrometers. The possibility of using 9Be(p, d)2α and 9Be(p, α)6Li nuclear reactions to create a population of fast alpha particles and study their behaviour in non-active stage of ITER operation is discussed in the paper.
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| 6. |
- Joffrin, E., et al.
(författare)
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Overview of the JET preparation for deuterium-tritium operation with the ITER like-wall
- 2019
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 59:11
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Forskningsöversikt (refereegranskat)abstract
- For the past several years, the JET scientific programme (Pamela et al 2007 Fusion Eng. Des. 82 590) has been engaged in a multi-campaign effort, including experiments in D, H and T, leading up to 2020 and the first experiments with 50%/50% D-T mixtures since 1997 and the first ever D-T plasmas with the ITER mix of plasma-facing component materials. For this purpose, a concerted physics and technology programme was launched with a view to prepare the D-T campaign (DTE2). This paper addresses the key elements developed by the JET programme directly contributing to the D-T preparation. This intense preparation includes the review of the physics basis for the D-T operational scenarios, including the fusion power predictions through first principle and integrated modelling, and the impact of isotopes in the operation and physics of D-T plasmas (thermal and particle transport, high confinement mode (H-mode) access, Be and W erosion, fuel recovery, etc). This effort also requires improving several aspects of plasma operation for DTE2, such as real time control schemes, heat load control, disruption avoidance and a mitigation system (including the installation of a new shattered pellet injector), novel ion cyclotron resonance heating schemes (such as the three-ions scheme), new diagnostics (neutron camera and spectrometer, active Alfven eigenmode antennas, neutral gauges, radiation hard imaging systems...) and the calibration of the JET neutron diagnostics at 14 MeV for accurate fusion power measurement. The active preparation of JET for the 2020 D-T campaign provides an incomparable source of information and a basis for the future D-T operation of ITER, and it is also foreseen that a large number of key physics issues will be addressed in support of burning plasmas.
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| 7. |
- Murari, A., et al.
(författare)
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A control oriented strategy of disruption prediction to avoid the configuration collapse of tokamak reactors
- 2024
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Ingår i: Nature Communications. - 2041-1723 .- 2041-1723. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- The objective of thermonuclear fusion consists of producing electricity from the coalescence of light nuclei in high temperature plasmas. The most promising route to fusion envisages the confinement of such plasmas with magnetic fields, whose most studied configuration is the tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one of the main potential showstoppers on the route to a commercial reactor. In this work we report how, deploying innovative analysis methods on thousands of JET experiments covering the isotopic compositions from hydrogen to full tritium and including the major D-T campaign, the nature of the various forms of collapse is investigated in all phases of the discharges. An original approach to proximity detection has been developed, which allows determining both the probability of and the time interval remaining before an incoming disruption, with adaptive, from scratch, real time compatible techniques. The results indicate that physics based prediction and control tools can be developed, to deploy realistic strategies of disruption avoidance and prevention, meeting the requirements of the next generation of devices.
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| 29. |
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- 2018
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:9
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Tidskriftsartikel (refereegranskat)
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| 30. |
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Overview of the JET results
- 2015
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 55:10
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Tidskriftsartikel (refereegranskat)
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| 31. |
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| 32. |
- Hobirk, J., et al.
(författare)
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The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium
- 2023
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Ingår i: Nuclear Fusion. - : Institute of Physics Publishing (IOPP). - 0029-5515 .- 1741-4326. ; 63:11
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Tidskriftsartikel (refereegranskat)abstract
- The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with the ITER-like Be/W wall. The development started in pure Deuterium with refinement of the plasma current, and toroidal magnetic field choices and succeeded in solving the heat load challenges arising from 37 MW of injected power in the ITER like wall environment, keeping the radiation in the edge and core controlled, avoiding MHD instabilities and reaching high neutron rates. The Deuterium hybrid plasmas have been re-run in Tritium and methods have been found to keep the radiation controlled but not at high fusion performance probably due to time constraints. For the first time this scenario has been run in Deuterium-Tritium (50:50). These plasmas were re-optimised to have a radiation-stable H-mode entry phase, good impurity control through edge Ti gradient screening and optimised performance with fusion power exceeding 10 MW for longer than three alpha particle slow down times, 8.3 MW averaged over 5 s and fusion energy of 45.8 MJ.
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| 33. |
- Maslov, M., et al.
(författare)
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JET D-T scenario with optimized non-thermal fusion
- 2023
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Ingår i: Nuclear Fusion. - : Institute of Physics (IOP). - 0029-5515 .- 1741-4326. ; 63:11
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Tidskriftsartikel (refereegranskat)abstract
- In JET deuterium-tritium (D-T) plasmas, the fusion power is produced through thermonuclear reactions and reactions between thermal ions and fast particles generated by neutral beam injection (NBI) heating or accelerated by electromagnetic wave heating in the ion cyclotron range of frequencies (ICRFs). To complement the experiments with 50/50 D/T mixtures maximizing thermonuclear reactivity, a scenario with dominant non-thermal reactivity has been developed and successfully demonstrated during the second JET deuterium-tritium campaign DTE2, as it was predicted to generate the highest fusion power in JET with a Be/W wall. It was performed in a 15/85 D/T mixture with pure D-NBI heating combined with ICRF heating at the fundamental deuterium resonance. In steady plasma conditions, a record 59 MJ of fusion energy has been achieved in a single pulse, of which 50.5 MJ were produced in a 5 s time window (P fus = 10.1 MW) with average Q = 0.33, confirming predictive modelling in preparation of the experiment. The highest fusion power in these experiments, P fus = 12.5 MW with average Q = 0.38, was achieved over a shorter 2 s time window, with the period of sustainment limited by high-Z impurity accumulation. This scenario provides unique data for the validation of physics-based models used to predict D-T fusion power.
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| 34. |
- Kim, Hyun-Tae, et al.
(författare)
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Validation of D-T fusion power prediction capability against 2021 JET D-T experiments
- 2023
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Ingår i: Nuclear Fusion. - 0029-5515 .- 1741-4326. ; 63:11
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Tidskriftsartikel (refereegranskat)abstract
- JET experiments using the fuel mixture envisaged for fusion power plants, deuterium and tritium (D-T), provide a unique opportunity to validate existing D-T fusion power prediction capabilities in support of future device design and operation preparation. The 2021 JET D-T experimental campaign has achieved D-T fusion powers sustained over 5 s in ITER-relevant conditions i.e. operation with the baseline or hybrid scenario in the full metallic wall. In preparation of the 2021 JET D-T experimental campaign, extensive D-T predictive modelling was carried out with several assumptions based on D discharges. To improve the validity of ITER D-T predictive modelling in the future, it is important to use the input data measured from 2021 JET D-T discharges in the present core predictive modelling, and to specify the accuracy of the D-T fusion power prediction in comparison with the experiments. This paper reports on the validation of the core integrated modelling with TRANSP, JINTRAC, and ETS coupled with a quasilinear turbulent transport model (Trapped Gyro Landau Fluid or QualLiKiz) against the measured data in 2021 JET D-T discharges. Detailed simulation settings and the heating and transport models used are described. The D-T fusion power calculated with the interpretive TRANSP runs for 38 D-T discharges (12 baseline and 26 hybrid discharges) reproduced the measured values within 20 % . This indicates the additional uncertainties, that could result from the measurement error bars in kinetic profiles, impurity contents and neutron rates, and also from the beam-thermal fusion reaction modelling, are less than 20 % in total. The good statistical agreement confirms that we have the capability to accurately calculate the D-T fusion power if correct kinetic profiles are predicted, and indicates that any larger deviation of the D-T fusion power prediction from the measured fusion power could be attributed to the deviation of the predicted kinetic profiles from the measured kinetic profiles in these plasma scenarios. Without any posterior adjustment of the simulation settings, the ratio of predicted D-T fusion power to the measured fusion power was found as 65%-96% for the D-T baseline and 81%-97% for D-T hybrid discharge. Possible reasons for the lower D-T prediction are discussed and future works to improve the fusion power prediction capability are suggested. The D-T predictive modelling results have also been compared to the predictive modelling of the counterpart D discharges, where the key engineering parameters are similar. Features in the predicted kinetic profiles of D-T discharges such as underprediction of ne are also found in the prediction results of the counterpart D discharges, and it leads to similar levels of the normalized neutron rate prediction between the modelling results of D-T and the counterpart D discharges. This implies that the credibility of D-T fusion power prediction could be a priori estimated by the prediction quality of the preparatory D discharges, which will be attempted before actual D-T experiments.
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| 35. |
- Kluge, U, et al.
(författare)
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Health services and the treatment of immigrants : data on service use, interpreting services and immigrant staff members in services across Europe
- 2012
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Ingår i: European psychiatry. - 0924-9338 .- 1778-3585. ; 27:Suppl 2, s. 56-62
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND:The number of immigrants using health services has increased across Europe. For assessing and improving the quality of care provided for immigrants, information is required on how many immigrants use services, what interpreting services are provided and whether staff members are from immigrant groups.METHODS:Structured interviews were conducted with 15 health services (9 primary care, 3 emergency departments, 3 mental health) located in areas with high immigrant populations in each of 16 European countries (n=240). Responses were collected on the availability of data on service use by immigrant patients, the provision of interpreting services and immigrant staff members.RESULTS:Data on service use by immigrants were recorded by only 15% of services. More than 40% of services did not provide any form of interpreting service and 54% of the services reported having no immigrant staff. Mental health services were more likely to use direct interpreting services, and both mental health and emergency services were more likely to have immigrant staff members.DISCUSSION:For assessing and improving the quality of care provided for immigrants, there is a need to improve the availability of data on service use by immigrants in health services throughout Europe and to provide more consistent access to interpreting services.
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| 36. |
- Priebe, S, et al.
(författare)
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Good practice in emergency care: views from practitioners :
- 2011
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Ingår i: Migration and Health in the European Union. - : Open University Press. - 9780335245673
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Bokkapitel (refereegranskat)abstract
- Migrants make up a growing share of European populations. However, all too often their situation is compounded by problems with accessing health and other basic services. There is a need for tailored health policies, but robust data on the health needs of migrants and how best these needs can be met are scarce.Written by a collaboration of authors from three key international organisations (the European Observatory on Health Systems and Policies, the EUPHA Section on Migrant and Ethnic Minority Health, and the International Organization for Migration), as well as leading researchers from across Europe, the book thoroughly explores the different aspects of migration and health in the EU and how they can be addressed by health systems.Structured into five easy-to-follow sections, the volume includes:Contributions from experts from across EuropeKey topics such as: access to human rights and health care; health issues faced by migrants; and the national and European policy response so farConclusions drawn from the latest available evidenceComprehensive information on different aspects of health and migration and how they can best be addressed by health systems is still not easy to find. This book addresses this shortfall and will be of major value to researchers, students, policy-makers and practitioners concerned with migration and health in an increasingly diverse Europe.
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| 37. |
- Priebe, S, et al.
(författare)
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Good practice in health care for migrants : views and experiences of care professionals in 16 European countries
- 2011
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Ingår i: BMC Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 11, s. 187-
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundHealth services across Europe provide health care for migrant patients every day. However, little systematic research has explored the views and experiences of health care professionals in different European countries. The aim of this study was to assess the difficulties professionals experience in their service when providing such care and what they consider constitutes good practice to overcome these problems or limit their negative impact on the quality of care.MethodsStructured interviews with open questions and case vignettes were conducted with health care professionals working in areas with high proportion of migrant populations in 16 countries. In each country, professionals in nine primary care practices, three accident and emergency hospital departments, and three community mental health services (total sample = 240) were interviewed about their views and experiences in providing care for migrant patients, i.e. from first generation immigrant populations. Answers were analysed using thematic content analysis.ResultsEight types of problems and seven components of good practice were identified representing all statements in the interviews. The eight problems were: language barriers, difficulties in arranging care for migrants without health care coverage, social deprivation and traumatic experiences, lack of familiarity with the health care system, cultural differences, different understandings of illness and treatment, negative attitudes among staff and patients, and lack of access to medical history. The components of good practice to overcome these problems or limit their impact were: organisational flexibility with sufficient time and resources, good interpreting services, working with families and social services, cultural awareness of staff, educational programmes and information material for migrants, positive and stable relationships with staff, and clear guidelines on the care entitlements of different migrant groups. Problems and good care components were similar across the three types of services.ConclusionsHealth care professionals in different services experience similar difficulties when providing care to migrants. They also have relatively consistent views on what constitutes good practice. The degree to which these components already are part of routine practice varies. Implementing good practice requires sufficient resources and organisational flexibility, positive attitudes, training for staff and the provision of information.
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| 38. |
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| 39. |
- Dauvrin, M., et al.
(författare)
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Health care for irregular migrants : Pragmatism across Europe. A qualitative study
- 2012
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Ingår i: BMC Research Notes. - : Springer Science and Business Media LLC. - 1756-0500. ; 5, s. Art. no. 99-
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Tidskriftsartikel (refereegranskat)abstract
- Abstract. Background: Health services in Europe face the challenge of delivering care to a heterogeneous group of irregular migrants (IM). There is little empirical evidence on how health professionals cope with this challenge. This study explores the experiences of health professionals providing care to IM in three types of health care service across 16 European countries. Results: Semi-structured interviews were conducted with health professionals in 144 primary care services, 48 mental health services, and 48 Accident & Emergency departments (total n = 240). Although legal health care entitlement for IM varies across countries, health professionals reported facing similar issues when caring for IM. These issues include access problems, limited communication, and associated legal complications. Differences in the experiences with IM across the three types of services were also explored. Respondents from Accident & Emergency departments reported less of a difference between the care for IM patients and patients in a regular situation than did respondents from primary care and mental health services. Primary care services and mental health services were more concerned with language barriers than Accident & Emergency departments. Notifying the authorities was an uncommon practice, even in countries where health professionals are required to do this. Conclusions: The needs of IM patients and the values of the staff appear to be as important as the national legal framework, with staff in different European countries adopting a similar pragmatic approach to delivering health care to IM. While legislation might help to improve health care for IM, more appropriate organisation and local flexibility are equally important, especially for improving access and care pathways. © 2012 Dauvrin et al; licensee BioMed Central Ltd.
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| 40. |
- Stankunas, M., et al.
(författare)
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Healthcare and aging : Do European Union countries differ?
- 2016
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Ingår i: International Journal of Health Care Quality Assurance. - 0952-6862 .- 1758-6542. ; 29:8, s. 895-906
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The purpose of this paper is to evaluate socio-economic inequalities in the use, accessibility and satisfaction with health services amongst 60-84 year old people from seven European urban communities. Design/methodology/approach: Data for this study were collected in 2009. The target population was people aged 60-84 years from Stuttgart (Germany), Athens (Greece), Ancona (Italy), Kaunas (Lithuania), Porto (Portugal), Granada (Spain) and Stockholm (Sweden). The total sample comprised 4,467 respondents with a mean response rate across these countries of 45.2 per cent. Findings: The study demonstrated that the majority of respondents had contact with a health care provider within the last 12 months. The highest percentages were reported by respondents from Spain (97.8 per cent) and Portugal (97.7 per cent). The results suggest that 13.0 per cent of respondents had refrained from seeking care services. The highest rates were amongst seniors from Lithuania (24.0 per cent), Germany (16.2 per cent) and Portugal (15.4 per cent). Logistic regression suggests that seniors who refrained from seeking health care was statistically significant associated with those with higher levels of education (odds ratios (OR)=1.21; 95 per cent confidence intervals (CI)=1.01-1.25) and financial strain (OR=1.26; 95 per cent CI=1.16-1.37). Furthermore, the majority of respondents were satisfied with health care services. Originality/value: The findings from the “Elder Abuse: a multinational prevalence survey” study indicate the existence of significant variations in use, accessibility and satisfaction with health services by country and for socio-economic factors related to organizing and financing of care systems.
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| 41. |
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| 42. |
- Lindert, J, et al.
(författare)
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Abuse and neglect of older persons in 7 cities in seven countries in Europe : a cross sectional community study
- 2013
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Ingår i: International Journal of Public Health. - : Springer Science and Business Media LLC. - 1661-8556 .- 1661-8564. ; 58:1, s. 121-132
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesWe aimed to investigate the prevalence rate of abuse (psychological, physical, sexual, financial, neglect) of older persons (AO) in seven cities from seven countries in Europe (Germany, Greece, Italy, Lithuania, Portugal, Spain, Sweden), and to assess factors potentially associated with AO.MethodsA cross-sectional study was conducted in 2009 (n = 4,467, aged 60–84). Potentially associated factors were grouped into domains (domain 1: age, gender, migration history; domain 2: education, occupation; domain 3: marital status, living situation; domain 4: habitation, income, financial strain). We calculated odds ratios (OR) with their respective 95 % confidence intervals (CI).ResultsPsychological AO was the most common form of AO, ranging from 10.4 % (95 % CI 8.1–13.0) in Italy to 29.7 % (95 % CI 26.2–33.5) in Sweden. Second most common form was financial AO, ranging from 1.8 % (95 % CI 0.9–3.2) in Sweden to 7.8 % (95 % CI 5.8–10.1) in Portugal. Less common was physical AO, ranging from 1.0 % (95 % CI 0.4–2.1) in Italy to 4.0 % (95 % CI 2.6–5.8 %) in Sweden. Sexual AO was least common, ranging from 0.3 (95 % CI 0.0–1.1) in Italy and Spain to 1.5 % (95 % CI 0.7–2.8) in Greece. Being from Germany (AOR 3.25, 95 % CI 2.34–4.51), Sweden (OR 3.16, 95 % CI 2.28–4.39) or Lithuania (AOR 2.45, 95 % CI 1.75–3.43) was associated with increased prevalence rates of AO.ConclusionCountry of residence of older people is independent from the four assessed domains associated with AO. Life course perspectives on AO are highly needed to get better insight, and to develop and implement prevention strategies targeted at decreasing prevalence rates of AO.
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| 46. |
- Fraga, S, et al.
(författare)
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Elder abuse and socioeconomic inequalities : A multilevel study in 7 European countries
- 2014
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Ingår i: Preventive Medicine. - : Elsevier BV. - 0091-7435 .- 1096-0260. ; 61, s. 42-47
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Tidskriftsartikel (refereegranskat)abstract
- Objectives To compare the prevalence of elder abuse using a multilevel approach that takes into account the characteristics of participants as well as socioeconomic indicators at city and country level.Methods In 2009, the project on abuse of elderly in Europe (ABUEL) was conducted in seven cities (Stuttgart, Germany; Ancona, Italy; Kaunas, Lithuania, Stockholm, Sweden; Porto, Portugal; Granada, Spain; Athens, Greece) comprising 4467 individuals aged 60–84 years. We used a 3-level hierarchical structure of data: 1) characteristics of participants; 2) mean of tertiary education of each city; and 3) country inequality indicator (Gini coefficient). Multilevel logistic regression was used and proportional changes in Intraclass Correlation Coefficient (ICC) were inspected to assert explained variance between models.Results The prevalence of elder abuse showed large variations across sites. Adding tertiary education to the regression model reduced the country level variance for psychological abuse (ICC = 3.4%), with no significant decrease in the explained variance for the other types of abuse. When the Gini coefficient was considered, the highest drop in ICC was observed for financial abuse (from 9.5% to 4.3%).Conclusion There is a societal and community level dimension that adds information to individual variability in explaining country differences in elder abuse, highlighting underlying socioeconomic inequalities leading to such behavior.
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| 47. |
- Fraga, S, et al.
(författare)
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Lifetime Abuse and Quality of Life among Older People
- 2017
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Ingår i: Health & Social Work. - : Oxford University Press (OUP). - 0360-7283 .- 1545-6854. ; 42:4, s. 215-222
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Tidskriftsartikel (refereegranskat)abstract
- Few studies have evaluated the impact of lifetime abuse on quality of life (QoL) among older adults. By using a multinational study authors aimed to assess the subjective perception of QoL among people who have reported abuse during the course of their lifetime. The respondents (N = 4,467; 2,559 women) were between the ages of 60 and 84 years and living in seven European countries (Germany, Greece, Italy, Lithuania, Portugal, Spain, and Sweden). Lifetime abuse was assessed by using a structured questionnaire that allowed to assess lifetime experiences of abuse. QoL was assessed with the World Health Organization Quality of Life–Old module. After adjustment for potential confounders, authors found that to have had any abusive experience decreased the score of sensory abilities. Psychological abuse was associated with lower autonomy and past, present, and future activities. Physical abuse with injuries significantly decreased social participation. Intimacy was also negatively associated with psychological abuse, physical abuse with injury, and sexual abuse. The results of this study provide evidence that older people exposed to abuse during their lifetime have a significant reduction in QoL, with several QoL domains being negatively affected.
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