Confinement of a plasma in a trap formed by a combined magnetic field

Ioffe, M. S.; Sobolev, R.I.

doi:10.1088/0368-3281/7/5/306

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Later the criterion was experimentally verified by Ioffe [23], demonstrating a striking stabilization of gross MHD modes and improvement in plasma confinement by a sufficiently Fig. 1 A 3D view of the theoretical device studied in this paper, with fission mantle, coolant outflow pipes and magnetic expanders at the ends strong quadrupolar field.…”

Section: The Vacuum Magnetic Field Propertiesmentioning

confidence: 61%

Field and Coil Design for a Quadrupolar Mirror Hybrid Reactor

2010

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A vacuum magnetic field from a superconducting coil set for a single cell minimum B fusion-fission mirror machine reactor is computed. The magnetic field is first optimized for MHD flute stability, ellipticity and field smoothness in a long-thin approximation. Recirculation regions and magnetic expanders are added to the mirror machine without an optimizing procedure. The optimized field is thereafter reproduced by a set of circular and quadrupolar coils. The coils are modelled using filamentary line current distributions. Basic scaling assumptions are implemented for the coil design, with a maximum allowed current density of 1.5 kA/cm 2 . The coils are optimized using a local optimization method and the resulting field is checked for MHD flute stability and maximum ellipticity.

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Section: The Vacuum Magnetic Field Propertiesmentioning

confidence: 61%

Field and Coil Design for a Quadrupolar Mirror Hybrid Reactor

2010

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“…MHD based theory was expanded to include anisotropic pressure plasmas, and led to the idea of a minimum B or magnetic well configuration. This was first demonstrated dramatically by Ioffe [16,17] in 1961 when following a suggestion by Artsimovich, a hexapole magnetic cusp was superimposed on a MHD unstable mirror plasma. This configuration stabilized the interchange instability increasing the confinement time by a factor of 30 ( figure 3).…”

Section: Fusion Plasma Physics a New Scientific Discipline Was Born mentioning

confidence: 85%

50 years of fusion research

Meade¹

2009

Nucl. Fusion

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Fusion energy research began in the early 1950s as scientists worked to harness the awesome power of the atom for peaceful purposes. There was early optimism for a quick solution for fusion energy as there had been for fission. However, this was soon tempered by reality as the difficulty of producing and confining fusion fuel at temperatures of 100 million • C in the laboratory was appreciated. Fusion research has followed two main pathsinertial confinement fusion and magnetic confinement fusion. Over the past 50 years, there has been remarkable progress with both approaches, and now each has a solid technical foundation that has led to the construction of major facilities that are aimed at demonstrating fusion energy producing plasmas.

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“…MHD instabilities are connected to the magnetic field topology (see e.g. [24][25][26]). Depletion of neutral density by efficient ionization and consequent plasma density oscillation through neutral-plasma coupling has also been suggested as a source of periodic plasma instabilities in ECR heated plasmas (see e.g.…”

Section: Discussionmentioning

confidence: 99%

Oscillations of ECR ion source beam current along the beam transport of the JYFL K-130 cyclotron

et al. 2013

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A versatile measurement system has been developed to study the temporal characteristics of ion beams in millisecond time scale. The system is composed of data acquisition hardware and LabVIEW based measurement and analysis program. The measurement system and ion beam current oscillation results measured with a 14 GHz AECR-U type ion source at University of Jyv"askyl"a, Department of Physics (JYFL), are presented. It is shown that the ion beams exhibit periodic current fluctuations at frequencies from 100 Hz to 1.5 kHz with amplitudes ranging from 1 to 65 percent of the average beam current. It is argued that these oscillations originate from the ion source plasma since their characteristics depend on the ion source tuning. It is shown that increasing the ion source solenoid magnetic field increases the relative oscillation amplitude. Increasing the ion source extraction voltage has the opposite effect. The beam current oscillations were measured along the low energy beam transport (LEBT) connecting the ion source to the JYFL K-130 cyclotron as well as in the following high energy beamline. It is shown that the beam current oscillations originating from the ion source are preserved during the LEBT but are not observed after the cyclotron. The transmission efficiency from the ion source through the cyclotron was measured with two beams of comparable beam currents but different oscillation frequency and amplitude, corresponding with the two cases typically seen when the ion source is tuned for high charge state production. The transmission of the LEBT remained unaltered but the cyclotron performance was affected by the varying oscillation characteristics.

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Confinement of a plasma in a trap formed by a combined magnetic field

Cited by 11 publications

References 2 publications

Field and Coil Design for a Quadrupolar Mirror Hybrid Reactor

Field and Coil Design for a Quadrupolar Mirror Hybrid Reactor

50 years of fusion research

Oscillations of ECR ion source beam current along the beam transport of the JYFL K-130 cyclotron

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