SIMULATION OF TOKAMAK RUNAWAY-ELECTRON EVENTS - STUDY OF THE RESPONSE OFMATERIALS BY USE OF AN ELECTRON LINEAR ACCELERATOR. PDF Download
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Author: H. Bolt
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: H. Bolt
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: H. Bolt
Publisher:
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Category :
Languages : en
Pages : 25
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Category : Electon accelerators
Languages : en
Pages : 32
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Author: T. Kawamura
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Category : Electron accelerators
Languages : en
Pages : 20
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Category : Aeronautics
Languages : en
Pages : 292
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Category : Science
Languages : en
Pages : 472
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Author:
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ISBN:
Category :
Languages : en
Pages : 201
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The phase-space dynamics of runaway electrons is studied, including the influence of loop voltage, radiation damping, and collisions. A theoretical model and a numerical algorithm for the runaway dynamics in phase space are developed. Instead of standard integrators, such as the Runge-Kutta method, a variational symplectic integrator is applied to simulate the long-term dynamics of a runaway electron. The variational symplectic integrator is able to globally bound the numerical error for arbitrary number of time-steps, and thus accurately track the runaway trajectory in phase space. Simulation results show that the circulating orbits of runaway electrons drift outward toward the wall, which is consistent with experimental observations. The physics of the outward drift is analyzed. It is found that the outward drift is caused by the imbalance between the increase of mechanical angular momentum and the input of toroidal angular momentum due to the parallel acceleration. An analytical expression of the outward drift velocity is derived. The knowledge of trajectory of runaway electrons in configuration space sheds light on how the electrons hit the first wall, and thus provides clues for possible remedies.
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Category : Power resources
Languages : en
Pages : 624
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Publisher: ScholarlyEditions
ISBN: 1481647741
Category : Technology & Engineering
Languages : en
Pages : 121
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Issues in Water and Power Engineering / 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Nuclear Engineering. The editors have built Issues in Water and Power Engineering: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Nuclear Engineering in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Water and Power Engineering: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Alexandre Fil
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ISBN:
Category :
Languages : en
Pages : 133
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Plasma disruptions are events occuring in tokamaks which result in the total loss of the plasma confinement and the end of the discharge. These disruptions are rapid and violent events and they can damage the tokamak walls and its structure if they are not controlled. A Disruption Mitigation System (DMS) is thus mandatory in ITER in order to reduce electromagnetic forces, mitigate heat loads and avoid Runaway Electrons (RE) generated by plasma disruptions. These combined objectives make the design of the DMS a complex and challenging task, for which substantial input from both experiments and modeling is needed. We present here modeling results on disruption mitigation by Massive Gas Injection (MGI), which is one of the main methods considered for the DMS of ITER. First, a model which stems from first principles is given for the tranport of neutrals in a plasma and applied to the study of the interaction of the MGI with the plasma. Main mechanisms responsible for the penetration of the neutral gas are described and studied. Charge-exchange processes between the neutrals and the ions of the plasma is found to play a major role. Then, the 3D non linear MHD code JOREK is applied to the study of MGI-triggered disruptions with a particular focus on the thermal quench phase and the MHD events which are responsible for it. The simulation results are compared to experiments done on the JET tokamak.
