62 research outputs found
Localized scrape-off layer density modifications by ion cyclotron near fields in JET and ASDEX-upgrade L-mode plasmas
- Author
- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2015
- Field of study
First plasma operation of the enhanced JET vertical stabilisation system
- Author
- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2011
- Field of study
A project dedicated to the enhancement of the JET vertical stabilization system was launched in 2006, including an upgrade of the Power Supply of the Radial Field Amplifier, of hardware and software of the vertical stabilization control system. The main aim was to double the JET capability in stabilising high current plasmas when subject to perturbations, in particular large Edge Localised Modes. We present here the results of first plasma operation with the new Enhanced Radial Field Amplifier and its data acquisition and control system, focussing on the benefits of an approach based on phased commissioning, modelling and offline algorithm validation. (C) 2011 EURATOM. Published by Elsevier B.V. All rights reserved
Overview of modelling activities for Plasma Control Upgrade in JET
- Author
- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2011
- Field of study
The JET enhancement project Plasma Control Upgrade (PCU) aimed at increasing the capabilities of the plasma vertical stabilization (VS) system. One of the activities of this project was devoted to the development of simple but sufficiently accurate models of the VS system so as to address the main design choices, use the simulation tools as reliable test-beds, and provide an adequate support to the engineering design and commissioning of the new Enhanced Radial Field Amplifier (ERFA). This paper illustrates some of the main achievements of the modelling activity, which gave rise to a closed loop model of the VS system, including plasma, PF coils and passive structures. In particular the paper deals with the selection of the set of turns to be used in the control coils and with the estimation of the eddy current effects on the VS system. The latter analysis addressed an upgrade of the converter units of ERFA, successfully implemented during its commissioning on plasma in August 2009. (C) 2011 Published by Elsevier B.V
The software and hardware architecture of the real-time protection of in-vessel components in JET-ILW
- Author
- Abduallev S
- Abhangi M
- Abreu P
- Afzal M
- Aggarwal KM
- Agostini FD
- Ahlgren T
- Ahn JH
- Aho-Mantila L
- Aiba N
- Airila M
- Albanese R
- Aldred V
- Alegre D
- Alessi E
- Aleynikov P
- Alfier A
- Alkseev A
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- Ambrosino G
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- Amosov V
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- Angioni C
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- Walker M
- Walker R
- Walsh M
- Wang E
- Wang N
- Warder S
- Warren RJ
- Waterhouse J
- Watkins NW
- Watts C
- Wauters T
- Weckmann A
- Weiland J
- Weisen H
- Weiszflog M
- Wellstood C
- West AT
- Wheatley MR
- Whetham S
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- Whitehead BD
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- Wiechec AB
- Wiesen S
- Wilkinson J
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- Wischmeier M
- Withenshaw G
- Withycombe A
- Witts DM
- Wood D
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- Wray S
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- Wright JC
- Wu J
- Wukitch S
- Wynn A
- Xu T
- Yadikin D
- Yanling W
- Yao L
- Yavorskij V
- Yoo MG
- Young C
- Young D
- Young ID
- Young R
- Zacks J
- Zagorski R
- Zaitsev FS
- Zanino R
- Zarins A
- Zastrow KD
- Zastrow KD
- Zerbini M
- Zhang W
- Zhou Y
- Zilli E
- Zoita V
- Zoletnik S
- Zychor I
- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2019
- Field of study
For the first time, the JET operation in deuterium-tritium (D-T) plasma, which is scheduled to take place on JET in 2020, will be performed in the ITER mix of plasma-facing component materials. In view of the preparation of the DT campaign (DTE2), several aspects of the plasma operation require significant improvements, such as a real-time protection of the first wall. The risk of damaging the metallic PFCs caused by beryllium melting or cracking of tungsten owing to thermal fatigue required a new reliable D-T compatible active protection system. Therefore, the future development of the JET real time first wall protection is focused on the D-T campaign and the ITER relevant conditions which may cause failure of camera electronics within the Torus hall. In addition to the technological aspect, the intensive preparation of the diverse software tools and real time algorithms for hot spot detection as well as alarm handling strategy required for the wall protection is in progress.This contribution describes the improved design, implementation, and operation of the near infrared (NIR) imaging diagnostic system of the JET-ILW plasma experiment and its integration into the existing JET protection architecture. To provide the reliable wall protection during the DTE2, two more sensitive logarithmic NIR camera systems equipped with new optical relays to take images and cameras outside of the biological shield have been installed on JET-ILW and calibrated with an in-vessel calibration light source (ICLS). Additionally, post-pulse data visualization and advanced analysis of all types of imaging data is provided by the new software framework JUVIL (JET users video imaging library). The formation of hot spots is recognized as a significant threat due to rapid surface temperature rise. Because it could trigger the protection system to stop a pulse, it is important to identify the mechanisms and conditions responsible for the formation of such hot spots. To address this issue the new software tool ` Hotspot Editor' has been developed
Fast ion synergistic effects in JET high performance pulses
- Author
- Abduallev S
- Abhangi M
- Abreu P
- Afzal M
- Aggarwal KM
- Agostini FD
- Ahlgren T
- Ahn JH
- Aho-Mantila L
- Aiba N
- Airila M
- Albanese R
- Aldred V
- Alegre D
- Alessi E
- Aleynikov P
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- Ambrosino R
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- Angelone M
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- Ulyatt D
- Urano H
- Utoh HH
- Uytdenhouwen I
- Vadgama AP
- Valcarcel D
- Valentinuzzi M
- Valisa M
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- Van Renterghem W
- van Rooij GJ
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- Wiesen S
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- Wynn A
- Xu T
- Yadikin D
- Yanling W
- Yao L
- Yavorskij V
- Yoo MG
- Young C
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- Young ID
- Young R
- Zacks J
- Zagorski R
- Zaitsev FS
- Zanino R
- Zarins A
- Zastrow KD
- Zerbini M
- Zhang W
- Zhou Y
- Zilli E
- Zoita V
- Zoletnik S
- Zychor I
- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2019
- Field of study
Fast ion synergistic effects were studied by predictive modelling of JET best performing pulses for various levels of neutral beam injection (NBI) and radio frequency (RF) power. Calculated DD neutron yields were analysed with the intention of separating the impact of RF synergistic effects due to changes in fast ion (FT) distribution function (DF) from secondary effects accompanying the application of RF power, namely changes in T-e and T-i . A novel approach in analysing the efficiency of fast ions in fusion reactions based on evaluation of the cumulative reaction rates is outlined and used in the study. Conclusions on the impact of fast ion synergistic effects on fusion performance are based on comparisons of beam-target (BT) and thermal (Th) DD reaction rates. It was found that changes in auxiliary heating power, NBI and RF, by 4 MW will affect DD fusion performance and neutron rates significantly. Simulations of the best performing JET pulses show that for H minority RF heating scheme with available RF power the impact of RF synergistic effects is somewhat lesser than the secondary effects related to changes in T-e and T-i . In conditions of much higher RF power the modification in fast ion distribution function (FI DF) and the impact of the fast ions on BT DD fusion becomes significant. The impact of the RF and NBI power on the BT reactivities was found to be of similar order; however, the NAT power has greater impact on reaction rates due to its larger effect on fast ion density
Scenario development for D-T operation at JET
- Author
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- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2019
- Field of study
The JET exploitation plan foresees D-T operations in 2020 (DTE2). With respect to the first D-T campaign in 1997 (DTE1), when JET was equipped with a carbon wall, the experiments will be conducted in presence of a beryllium-tungsten ITER-like wall and will benefit from an extended and improved set of diagnostics and higher additional heating power (32 MW neutral beam injection + 8 MW ion cyclotron resonance heating). There are several challenges presented by operations with the new wall: a general deterioration of the pedestal confinement; the risk of heavy impurity accumulation in the core, which, if not controlled, can cause the radiative collapse of the discharge; the requirement to protect the divertor from excessive heat loads, which may damage it permanently. Therefore, an intense activity of scenario development has been undertaken at JET during the last three years to overcome these difficulties and prepare the plasmas needed to demonstrate stationary high fusion performance and clear alpha particle effects. The paper describes the status and main achievements of this scenario development activity, both from an operational and plasma physics point of view
A machine learning approach based on generative topographic mapping for disruption prevention and avoidance at JET
- Author
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- Zerbini M
- Zhang W
- Zhou Y
- Zilli E
- Zoita V
- Zoletnik S
- Zychor I
- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2019
- Field of study
The need for predictive capabilities greater than 95% with very limited false alarms are demanding requirements for reliable disruption prediction systems in tokamaks such as JET or, in the near future, ITER. The prediction of an upcoming disruption must be provided sufficiently in advance in order to apply effective disruption avoidance or mitigation actions to prevent the machine from being damaged.In this paper, following the typical machine learning workflow, a generative topographic mapping (GTM) of the operational space of JET has been built using a set of disrupted and regularly terminated discharges. In order to build the predictive model, a suitable set of dimensionless, machine-independent, physics-based features have been synthesized, which make use of 1D plasma profile information, rather than simple zero-D time series. The use of such predicting features, together with the power of the GTM in fitting the model to the data, obtains, in an unsupervised way, a 2D map of the multi-dimensional parameter space of JET, where it is possible to identify a boundary separating the region free from disruption from the disruption region. In addition to helping in operational boundaries studies, the GTM map can also be used for disruption prediction exploiting the potential of the developed GTM toolbox to monitor the discharge dynamics. Following the trajectory of a discharge on the map throughout the different regions, an alarm is triggered depending on the disruption risk of these regions. The proposed approach to predict disruptions has been evaluated on a training and an independent test set and achieves very good performance with only one tardive detection and a limited number of false detections. The warning times are suitable for avoidance purposes and, more important, the detections are consistent with physical causes and mechanisms that destabilize the plasma leading to disruptions
Overview of the JET results
- Author
- Abhangi M.
- Abreu P.
- Aftanas M.
- Afzal M.
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- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2015
- Field of study
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 confinement and pedestal behaviour before and after the ITER-like wall installation have been better characterized towards the development of high fusion yield scenarios in DT. Post-mortem analyses of the plasma-facing components have confirmed the previously reported low fuel retention obtained by gas balance and shown that the pattern of deposition within the divertor has changed significantly with respect to the JET carbon wall campaigns due to the absence of thermally activated chemical erosion of beryllium in contrast to carbon. Transport to remote areas is almost absent and two orders of magnitude less material is found in the divertor
Micro ion beam analysis for the erosion of beryllium marker tiles in a tokamak limiter
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- Zychor I
- Publication venue
- 'Elsevier BV'
- Publication date
- 01/01/2019
- Field of study
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 interlayer (2-3 mu m) between them. The thickness variation of the beryllium coating layer, after exposure to plasma, could indicate the erosion measured by ion beam analysis with backscattering spectrometry. However, interpretations from broad beam backscattering spectra were limited by the non-uniform surface structures. Therefore, micro-ion beam analysis (mu-IBA) with 3 MeV proton beam for Elastic back scattering spectrometry (EBS) and PIXE was used to scan samples. The spot size was in the range of 3-10 mu m. Scanned areas were analysed with scanning electron microscopy (SEM) as well. Combining results from mu-IBA and SEM, we obtained local spectra from carefully chosen areas on which the surface structures were relatively uniform. Local spectra suggested that the scanned area (approximate to 600 mu m x 1200 mu m) contained regions with serious erosion with only 2-3 mu m coating beryllium left, regions with intact marker tile, and droplets with 90% beryllium. The nonuniform erosion, droplets mainly formed by beryllium, and the possible mixture of beryllium and nickel were the major reasons that confused interpretation from broad beam EBS
Ion cyclotron resonance heating scenarios for DEMO
- Author
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- Publication venue
- 'IOP Publishing'
- Publication date
- 01/01/2019
- Field of study
The present paper offers an overview of the potential of ion cyclotron resonance heating (ICRH) or radio frequency heating for the DEMO machine. It is found that various suitable heating schemes are available. Similar to ITER and in view of the limited bandwidth of about 10 MHz that can be achieved to ensure optimal functioning of the launcher, it is proposed to make core second harmonic tritium heating the key ion heating scheme, assisted by fundamental cyclotron heating He-3 in the early phase of the discharge; for the present design of DEMO-with a static magnetic field strength of B-o = 5.855 T-that places the T and 3He layers in the core for f = 60 MHz and suggests centering the bandwidth around that main operating frequency. In line with earlier studies for hot, dense plasmas in large-size magnetic confinement machines, it is shown that good single pass absorption is achieved but that the size as well as the operating density and temperature of the machine cause the electrons to absorb a non-negligible fraction of the power away from the core when core ion heating is aimed at. Current drive and alternative heating options are briefly discussed and a dedicated computation is done for the traveling wave antenna, proposed for DEMO in view of its compatibility with substantial antenna-plasma distances. The various tasks that ICRH can fulfill are briefly listed. Finally, the impact of transport and the sensitivity of the obtained results to changes in the machine parameters is commented on
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