Dynamic Simulation of the Electron Bernstein Wave Heating Under NBI Conditions in TJ–II Plasmas

Cappa, Á.; López‐Bruna, D.; Castejón, F.; Ochando, M. A.; Vázquez-Poletti, José Luis; Medina, F.; Ascasíbar, E.; Reynolds, J. M.; Tereshchenko, M.

doi:10.1002/ctpp.200900060

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…An example of the plasma evolution estimated using this workflow can be seen in Figure 7. The results produced by this workflw are physically relevant and have published in [17]. Fig.…”

Section: Astra-maratramentioning

confidence: 66%

Grid Computing for Fusion Research

Castejón¹,

Gómez-Iglesias²

2011

Advances in Grid Computing

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“…An example of the plasma evolution estimated using this workflow can be seen in Figure 7. The results produced by this workflw are physically relevant and have published in [17]. Fig.…”

Section: Astra-maratramentioning

confidence: 66%

Grid Computing for Fusion Research

Castejón¹,

Gómez-Iglesias²

2011

Advances in Grid Computing

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“…All the beam-tracing calculations (of both the test beam and the beamlets) were performed using the TRUBA code. Due to a relatively low computational cost and an inherent parallelizability, the introduced numerical technique can be used not only in the usual calculations of wave propagation in fusion devices but also, for example, as a part of selfconsistent kinetic simulations of the resonant wave-plasma interaction [31] and in dynamical transport-integrated wave heating simulations [23]. Similar to the examined cases of Gaussian parent beams, the same approach is evidently applicable for modelling a variety of non-GBs (only the functional dependence f (ξ, η) needs to be changed).…”

Section: Discussionmentioning

confidence: 99%

“…The results presented in this section are obtained using the TRUBA ray/BT code [20], which previously has been employed for the calculation of various microwave heating [19,[21][22][23] and current drive [24] scenarios in the TJ-II stellarator, as well as for reflectometry [25,26] and electron Bernstein and EC emission [27] modelling. Here we restrict the calculations to the X-mode waves at ω/2π = 53.2 GHz (the vacuum wavelength is 0.56 cm), that is typical for the 2nd harmonic electron cyclotron resonance heating (ECRH) in TJ-II.…”

Section: Application To Modelling Of Ec Waves In Fusion Plasmasmentioning

confidence: 99%

Application of Gabor expansion to beam-tracing problems in inhomogeneous plasmas

Tereshchenko¹,

Castejón²,

Cappa³

2013

Plasma Phys. Control. Fusion

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In this paper we develop a theoretical framework for the phase-space Gaussian beamlet decomposition of the beam-like wavefields in plasmas. It is based on the discrete Gabor expansion of the wavefield distribution along a pre-selected equiphase surface. In particular, we consider the situations where the Gaussian beamlets can be chosen much narrower than the parent beam, though much wider than the wavelength of the radiation. Eventual summation of the independently computed beamlets will thus give the net wavefield that properly accounts for the effects of smaller-scale inhomogeneities. While using the standard beam-tracing (BT) method for the computation of each propagating beamlet, this approach is able to improve the accuracy of the stand-alone BT technique applied to the wide parent beam in cases of strong refraction or oblique absorption. We demonstrate the potency and relatively low computational cost of the introduced method in numerical examples, which reproduce different patterns of microwave propagation in the TJ-II stellarator plasma.

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A novel pilot job approach for improving the execution of distributed codes: application to the study of ordering in collisional transport in fusion plasmas

Montero

Castejón

Huedo

et al. 2014

Concurrency and Computation

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SummaryThere are many applications in every scientific and engineering fields that have high computational requirements. They have to be adapted to either high‐performance computing or high‐throughput computing platforms, depending on their characteristics. For the latter case, the high volume of resources available in grid infrastructures should allow for a reduction of their calculation times and an increase of the accuracy of the results. Nevertheless, the low performance achieved by early‐binding methods is noticeable, and the current systems based on pilot jobs are not suitable for running legacy applications. Therefore, running a wide range of codes quickly and easily can be infeasible for many users and developers. For this reason, it would be of great advantage to count on pilot job techniques that truly exploit grid resources in an efficient way while maintaining compatibility with legacy applications. In this work, GWpilot is presented as a complete pilot job framework that overcomes the adaptability limitations of other pilot job systems to tackle the challenge of efficiently accomplishing high‐throughput calculations. To test the GWpilot system, two applications widely used for studying the properties of collisional transport in fusion plasmas (drift kinetic equation solver code and integrator of stochastic differential equations in plasmas) have been chosen as a proof of concept. Real calculations were performed with them to illustrate the adaptation process to the new framework and its performance. Additionally, the physics results obtained were analysed for completeness and further reading. Both applications also represent two different approaches further extended in the scientific community, that is, parameter sweep and Monte Carlo codes. Therefore, the general suitability of GWpilot for scientific and industrial applications belonging to other fields is demonstrated in this work. Copyright © 2014 John Wiley & Sons, Ltd.

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Dynamic Simulation of the Electron Bernstein Wave Heating Under NBI Conditions in TJ–II Plasmas

Cited by 5 publications

References 13 publications

Grid Computing for Fusion Research

Grid Computing for Fusion Research

Application of Gabor expansion to beam-tracing problems in inhomogeneous plasmas

A novel pilot job approach for improving the execution of distributed codes: application to the study of ordering in collisional transport in fusion plasmas

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