Observation of magnetohydrodynamic stability limit in a cusp-anchored gas-dynamic trap

Anikeev, A. V.; Bagryansky, P. A.; Deichuli, P. P.; Ivanov, A. A.; Karpushov, A.; Maximov, V. V.; Podminogin, A.A.; Stupishin, N.; Tsidulko, Yu. A.

doi:10.1063/1.872493

Cited by 37 publications

(17 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stabilization of axially symmetric plasma by cusp end cell was also studied. The results are discussed in [17]. Generally, in the experiments, the plasma parameters were limited because of accumulation of fast ion in the central cell and subsequent loss of MHD stability.…”

Section: Gdt Experimentsmentioning

confidence: 99%

Future Perspectives and Status of Magnetic Mirror Studies in Novosibirsk

Ivanov

Bagryansky

Бурдаков

et al. 2019

Plasma and Fusion Research

View full text Add to dashboard Cite

In the paper, we present the Budker Institute long term plans for development of the plasma physics database for an advanced fuel fusion reactor based on the axisymmetric linear magnetic trap. An analysis of the existing database gained in the experiments at the open magnetic systems in the Budker Institute and worldwide is presented. To develop the required database a stepwise approach is applied, which suggests construction of the several experimental devices with progressively increased plasma parameters, which incorporate the different constituents of the approach.

show abstract

Section: Gdt Experimentsmentioning

confidence: 99%

Future Perspectives and Status of Magnetic Mirror Studies in Novosibirsk

Ivanov

Bagryansky

Бурдаков

et al. 2019

Plasma and Fusion Research

View full text Add to dashboard Cite

show abstract

“…The DINA-5F injector for the Madison symmetric torus ͑MST͒ 5 is essentially a modification of the DINA-5 6 injector developed for applications for the GDT mirror machine. 7 The injector consists of an ion source and a neutralizer. The ion source and neutralizer are mounted inside a cylindrical soft-iron magnetic screen which reduces the stray magnetic field to a tolerable value.…”

Section: Injector Descriptionmentioning

confidence: 99%

A diagnostic neutral beam system for the MST reversed-field pinch

Abdrashitov

Давыденко

Deichuli

et al. 2001

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

A diagnostic neutral beam system has been developed for the Madison symmetric torus ͑MST͒ reversed-field pinch. The system is primarily used: ͑1͒ for measurement of the majority ion equilibrium and fluctuating velocity and temperature by Rutherford scattering ͑RS͒; ͑2͒ for measurement of the impurity ion velocity and temperature, both equilibrium and fluctuating, by charge-exchange recombination spectroscopy ͑CHERS͒; and ͑3͒ for magnetic field measurement via motional Stark effect ͑MSE͒. The system consists of two neutral beam injectors, and two neutral particle analyzers. One injector creates a 20 keV, 4 A helium beam for RS. The energy spectra of the helium beam atoms scattered from the plasma ions is measured with two 12-channel, 45°e lectrostatic energy analyzers equipped with a hydrogen stripping cell. A second injector creates a 30 keV, 4 A hydrogen beam, which is used for the CHERS and MSE diagnostics. In each injector ions are extracted from a plasma created by an arc discharge source and, after acceleration and focusing, neutralized in a gaseous target. A low ion perpendicular temperature at the plasma emission surface, achieved via plasma expansion cooling, results in a low ͑0.016 rad͒ intrinsic beam divergence. A hallmark of the beam design is the focusing ion optical system that consists of four multiaperture spherically curved electrodes. The geometric focusing, together with a low intrinsic beam divergence, provides a small beam size-5 cm in diameter-on the MST axis and a high neutral current density ͑0.4 equivalent A/cm 2 ͒. A beam injector is compact in size-30 cm in diameter and 70 cm in length-and weighs about 70 kg. In this article we present details of the beam and analyzer designs and first results of their tests on the MST.

show abstract

“…Quantifying the extra input power necessary to keep the ions hot requires accurate measurements of the bulk majority ion temperature, which can be made by Rutherford scattering ͑RS͒. 3 Since RS has been used only occasionally to diagnose magnetically confined plasmas ͑on the tokamaks T-3, 4 JT-60, 5 and TEXTOR, 6 and the mirror GDT 7 ͒, we report a comparison between RS and the two other, more well-established ion temperature diagnostics currently on MST. In addition to RS, 8 MST features charge exchange recombination spectroscopy ͑CHERS͒, 9 and passive Doppler spectroscopy ͓the ion dynamics spectrometer ͑IDS͒ 10 ͔.…”

Section: Introductionmentioning

confidence: 99%

Comparison of ion temperature diagnostics on the Madison symmetric torus reversed-field pinch

Reardon

Craig

Hartog

et al. 2003

Review of Scientific Instruments

View full text Add to dashboard Cite

There have been three ion temperature diagnostics operating on the Madison symmetric torus ͑MST͒ for the past two years: ͑i͒ Charge-exchange recombination spectroscopy ͑CHERS͒, which measures the temperature of fully stripped impurity (C 6ϩ) ions, and has a spatial resolution of Ϯ1 cm and a time resolution of 3 ms; ͑ii͒ Rutherford scattering ͑RS͒, which measures the temperature of the bulk majority (D ϩ) ions, and has a spatial resolution of roughly Ϯ7 cm and a time resolution of 30 s; and ͑iii͒ the ion dynamics spectrometer ͑IDS͒, which measures a chordal average of the temperature of partially stripped impurity (C 4ϩ) ions, with a time resolution of 10 s. The first two diagnostics use neutral beams, while the third is passive. The classical ion energy equilibration time ii Ͻ1 ms between all ion species, so we naively expect that all ion temperature measurements should agree in steady state. Here we present simultaneous measurements of: CHERS and RS profiles in high-current burst-free pulsed poloidal current drive ͑PPCD͒ discharges; CHERS and RS profiles in standard high-current discharges; and IDS and RS profiles in standard low-current discharges. Measurements in standard discharges are made a long time before and after magnetic reconnection events, during which there is believed to be a large, nonclassical input of energy to the ions. RS and CHERS measurements consistently agree; IDS measurements are consistently less than RS measurements, due to the effect of the C 4ϩ emission profile on the IDS measurements.

show abstract

Observation of magnetohydrodynamic stability limit in a cusp-anchored gas-dynamic trap

Cited by 37 publications

References 10 publications

Future Perspectives and Status of Magnetic Mirror Studies in Novosibirsk

Future Perspectives and Status of Magnetic Mirror Studies in Novosibirsk

A diagnostic neutral beam system for the MST reversed-field pinch

Comparison of ion temperature diagnostics on the Madison symmetric torus reversed-field pinch

Contact Info

Product

Resources

About