TJ-II Project: A Flexible Heliac Stellarator

Alejaldre, C.; Gozalo, Jose Javier Alonso; Perez, Jose Botija; Magaña, Francisco Castejón; Diaz, J.R. Cepero; Löpez‐Fraguas, A.; Garcia, L.; Krivenski, V.; Martı́n, Rosario; Navarro, Albert; Perea, Á.; Rodriguez-Yunta, A.; Ayza, Mario Sorolla; Varias, A.

doi:10.13182/fst17-131-139

Cited by 173 publications

(99 citation statements)

References 6 publications

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“…Ultimately, a global understanding of magnetically confined plasmas would be required. [22]. The magnetic field strength is shown.…”

Section: Discussionmentioning

confidence: 99%

“…For the tokamak case we use an analytical expansion valid in the limit when the distance the long way around the torus is much longer than the distance the short way around the torus. For the stellarator case we use a full 3-dimensional numerically obtained equilibria for the TJ-II helical axis stellarator [22].…”

Section: • Equilibriamentioning

confidence: 99%

“…For comparison a top-view of the four-field period stellarator TJ-II [22] is shown in Fig.3. The physical quantity displayed is the magnetic field strength.…”

Section: Balancing the Forcesmentioning

confidence: 99%

“…The stellarator presented in this paper has four-fold symmetry (Fig.3) and N per = 4. The magnetic field components are also given in terms of Fourier series, similar to equations (21,22). The required resolution generally depends on the object and the quantities being displayed.…”

Section: Visualizationmentioning

confidence: 99%

“…where R ij ≡ R(θ i , φ j ) and Z ij ≡ Z(θ i , φ j ) are calculated using equations (21,22). Using equations (23,24,25), the position vector r = x x + y y + z z is known everywhere on the magnetic surface.…”

Section: Visualizationmentioning

confidence: 99%

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Visualization of magnetically confined plasmas

Lewandowski

1999

Computing and Visualization in Science

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With the rapid developments in experimental and theoretical fusion energy research towards more geometric details, visualization plays an increasingly important role. In this paper we will give an overview of how visualization can be used to compare and contrast some different configurations for future fusion reactors. Specifically we will focus on the stellarator and tokamak concepts. In order to gain understanding of the underlying fundamental differences and similarities these two competing concepts are compared and contrasted by visualizing some key attributes.

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“…Ultimately, a global understanding of magnetically confined plasmas would be required. [22]. The magnetic field strength is shown.…”

Section: Discussionmentioning

confidence: 99%

Section: • Equilibriamentioning

confidence: 99%

“…For comparison a top-view of the four-field period stellarator TJ-II [22] is shown in Fig.3. The physical quantity displayed is the magnetic field strength.…”

Section: Balancing the Forcesmentioning

confidence: 99%

Section: Visualizationmentioning

confidence: 99%

Section: Visualizationmentioning

confidence: 99%

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Visualization of magnetically confined plasmas

Lewandowski

1999

Computing and Visualization in Science

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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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Experimental Study of the Effect of Poloidal Flow on Stability of Magnetic Islands in LHD and TJ‐II

Narushima¹,

Castejón²,

Watanabe³

et al. 2010

Contrib. Plasma Phys.

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The effect of the poloidal flow on the magnetic island is studied. The self-healing of the magnetic island has been observed in the Large Helical Device (LHD) and TJ-II. In TJ-II plasmas, the magnetic island is healed in case the radial electric field is positive. In the LHD experiment, on the other hand, the radial electric field is negative when the magnetic island is healed. The relation between the magnitudes of the E×B flow and ion diamagnetic flow is important to consider the effect of the poloidal flow on magnetic island.

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TJ-II Project: A Flexible Heliac Stellarator

Cited by 173 publications

References 6 publications

Visualization of magnetically confined plasmas

Visualization of magnetically confined 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

Experimental Study of the Effect of Poloidal Flow on Stability of Magnetic Islands in LHD and TJ‐II

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