Plasma‐Wave Interaction in a Toroidal Steady‐State Device

Alba, S.; Fontanesi, M.; Galassi, A.; Riccardi, C.; Sindoni, E.

doi:10.4006/1.3029056

Cited by 16 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite this major topological diversity, similar results are found concerning the statistical properties of signals and the presence of structures in the plasma [73]. Like several fusion experimental devices [74], also in the Thorello [75] SMT long range correlations and non-Gaussian PDFs have been detected; moreover intermittency is clearly present in the signals [76]. Analogously, in the KT5D SMT the investigation of the statistical properties of intermittency were carried out [77].…”

Section: Bursts and Structuressupporting

confidence: 67%

Coherent structures and transport properties in magnetized plasmas

Serianni

Agostini

Antoni

et al. 2007

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

A common feature of magnetized plasmas is the presence of fluctuations, which can lead to fully developed turbulence. Often large events-called bursts-emerge from the remaining low-level turbulence, giving an intermittent character to fluctuations; namely the statistical properties of fluctuations are found to depend on the temporal scale over which the investigation is conducted.In magnetized plasmas, the bursts are generally believed to be due to the presence of magnetic-field-aligned structures. Moreover, it has been experimentally shown that the intermittent events detected in the signals are associated with a relevant contribution to the loss of particles from the plasma.All these observations are common to plasmas spanning a wide range of temperature and density and magnetically confined both in linear and toroidal devices. In particular, in high-temperature plasmas for thermonuclear fusion, research aims at devising suitable ways to control transport by acting on the plasma structures, for instance by biasing the plasma edge using electrodes.This paper gives a characterization of the structures found in magnetized plasmas and of their contribution to the particle transport; moreover, the effect of the velocity shear on structures is addressed. Emphasis will be laid on to the most advanced diagnostics allowing the reconstruction of turbulent structures by optical and electrostatic techniques.

show abstract

Section: Bursts and Structuressupporting

confidence: 67%

Coherent structures and transport properties in magnetized plasmas

Serianni

Agostini

Antoni

et al. 2007

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…12 Thorello produces a simple magnetized plasma in steady-state condition, without rotational transform, characterized by a turbulent regime. 13 The plasma is produced by a steady state discharge between three incandescent tungsten wires placed in the inner part of the torus and the chamber walls with a polarization voltage of about V P ϭ80 V. The typical plasma parameters of the data of this article are B T ϭ1.5 kG, T e Ϸ2 eV, n i ϭ10 9 cm Ϫ3 in the edge region, n i ϭ10 11 cm Ϫ3 in the plasma core, and P N ϭ6ϫ10 Ϫ4 mbar in hydrogen.…”

Section: Triple Probe Methodsmentioning

confidence: 99%

Comparison between fast-sweep Langmuir probe and triple probe for fluctuations measurements

Riccardi

Longoni

Chiodini

et al. 2001

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inPractical solutions for reliable triple probe measurements in magnetized plasmas Rev. Sci. Instrum. 82, 013504 (2011); 10.1063/1.3516045 Spatiotemporal temperature fluctuation measurements by means of a fast swept Langmuir probe array Rev. Sci. Instrum. 78, 053505 (2007); A 400 kHz, fast-sweep Langmuir probe for measuring plasma fluctuations Rev.Two techniques are applied and the results compared both in the plasma core and in the edge region of ''Thorello,'' to estimate electron temperature fluctuations. The first method is a fast-sweep Langmuir probe: it is a new apparatus based on a dual channel circuit that compensates for stray capacitance and permits sweep speeds up to 400 kHz, so that we can investigate the electrostatic turbulence with good temporal resolution. The second technique is the conventional triple probe: this method allows us to measure density, temperature, and floating potential as a function of time. The fast-sweep Langmuir probe provides a more reliable electron temperature fluctuations and these measurements are essential for a correct interpretation of density and potential fluctuations.

show abstract

“…Various SMTs are operated worldwide, e. g. BETA at the Institute for Plasma Research in Bath, India [17], BLAA-MANN at the University of Tromsø, Norway [18], TORIX at theÉcole Polytechnique, Palaiseau, France [19], THORELLO at the University of Milano, Italy [20], and TEDDI at the University of Kiel, Germany [21]. Their purely toroidal magnetic field configuration lies between those of linear machines and the nested magnetic field lines of fusion devices.…”

Section: Introductionmentioning

confidence: 99%

Observation of Mode like Coherent Structures in Curved Magnetic Fields of a Simple Magnetized Torus

Greiner¹,

Block

Piel

2004

Contrib. Plasma Phys.

View full text Add to dashboard Cite

The spatio-temporal dynamics of large-scale structures in curved magnetic field of simple magnetized torus (SMT) are presented. The experiments are performed in the SMT BLAAMANN and employ the techniques of conditional averaging (CA) and cross-correlation (CCF) of Langmuir probe data. By means of a detailed comparison of radio-frequency and thermionic discharges, it is shown that general features of the observed large-scale structures are independent of the discharge mechanism. Further, the observed large scale structures have a pronounced spatio-temporal periodicity, which suggests a description as mode-like. The conjectured relationship between the observed coherent structures and the inverse energy cascade is therefore questioned again.

show abstract

Plasma‐Wave Interaction in a Toroidal Steady‐State Device

Cited by 16 publications

References 0 publications

Coherent structures and transport properties in magnetized plasmas

Coherent structures and transport properties in magnetized plasmas

Comparison between fast-sweep Langmuir probe and triple probe for fluctuations measurements

Observation of Mode like Coherent Structures in Curved Magnetic Fields of a Simple Magnetized Torus

Contact Info

Product

Resources

About