Field-reversal experiments in a neutral-beam-injected mirror machine

Turner, W.C.; Clauser, John F.; Coensgen, F.H.; Correll, D.L.; Cummins, W.F.; Freis, R.P.; Goodman, R.K.; Hunt, A. L.; Kaiser, T. B.; Melin, G.; Nexsen, W.E.; Simonen, T.C.; Stallard, B. W.

doi:10.1088/0029-5515/19/8/002

Cited by 64 publications

(28 citation statements)

References 27 publications

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“…A Thomson scattering system in the east end plug has measured electron temperatures as high as 260 eV-three times the characteristic value obtained on 2XIIB (Ref. 4) with comparable beam current. The mean energy of the center-cell plasma is estimated from the plasma diamagnetism and the density profile.…”

Section: Solenoid Coilsmentioning

confidence: 57%

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Electrostatic Plasma-Confinement Experiments in a Tandem Mirror System

et al. 1980

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Results from the tandem mirror experiment are described. The configuration of axial density and potential profiles are created and sustained by neutral-beam injection and gas fueling. Plasma confinement in the center cell is shown to be improved by the end plugs by as much as a factor of 9. The electron temperature is higher than that achieved in our earlier 2XIIB single-cell mirror experiment.PACS numbers: 52.55. Mg, 52.55.Ke This Letter reports the first results obtained from the tandem mirror experiment (TMX) at the Lawrence Livermore Laboratory. Steady-state tandem-mirror plasmas have been produced and an electrostatic barrier that improves plasma confinement has been observed. The tandem-mirror configuration 1 ' 2 can enhance the performance of a magnetic-mirror thermonuclear reactor. Such a reactor would produce power in a cylindrical, high-/3, magnetic solenoid. End losses from this center cell are reduced by electrostatic endplug barriers of positive potential, which turn back those low-energy ions which escape through the magnetic mirror. These potential barriers are established on both ends of the center cell by high-density, high-temperature, mirror-confined plasmas, which have a larger ambipolar potential than does the center-cell plasma.Earlier tandem-mirror experiments, 3 in which plasma guns were used to establish end-plug densities larger than those in the center cell, have produced potential wells. Langmuir-probe measurements indicated that the magnitude and scaling of the potential-well depth is consistent with theoretical predictions. Our results demonstrate that we can produce and sustain a tandem-mirror plasma configuration by use of neutral beams to fuel the end plugs and gas to fuel the center cell. This method can be extrapolated to continuously operated systems. Our experiments further demonCee coil Baseball coilSolenoid coils Octupole coil -Plasma flux tube 1132 Neutral beam injectors Startup plasma guns FIG. 1. Schematic diagram of TMX magnet and neutral-beam system.

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Section: Solenoid Coilsmentioning

confidence: 57%

“…4 These guns are located outside the plugs. After startup, low-energy plasma from the center cell is required to maintain the plug plasmas.…”

Section: Solenoid Coilsmentioning

confidence: 99%

Electrostatic Plasma-Confinement Experiments in a Tandem Mirror System

et al. 1980

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“…The unique result obtained in the seventies of the last century on 2XIIB (LLNL, USA) device [1] gives reason to expect for the possibility of realization of reversed magnetic field configuration in a mirror trap with powerful neutral beams. Ratio between diamagnetic field perturbation and vacuum magnetic field B/B=0.9 was achieved with 7 MW of full power of neutral beams and current density of neutrals 0.7 atomic A/cm 2 at the plasma axis in special series of 2XIIB experiment.…”

Section: Introductionmentioning

confidence: 99%

Status of the experiment on magnetic field reversal at BINP

Bagryansky

Akhmetov

Chernoshtanov

et al. 2016

AIP Conference Proceedings

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The BINP road map for development of fusion reactor based on a linear machine AIP Conference Proceedings 1771, 080001 (2016) Abstract. The paper describes experiment devoted to the field reversal in a mirror trap with neutral beam injection, which is planned for realization now in Budker Institute. The technical details of experimental device and expected plasma parameters are discussed. In accordance with theoretical predictions, parameters of experimental facility (neutral beam current -240 atom A, energy of neutrals -15 keV, magnetic field -0.2 T, electron temperature 50 eV and target plasma density ~10 13 -10 14 cm -3 ) are expected to be sufficient to field reversal in the case, if anomalous ion losses are not essential.

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“…It forms population of axis-circling fast ions. This method was experimentally tested on 2XIIB device, where the magnetic field inside the plasma decreased by about ten times [1]. Further accumulation of fast ions and field reversal were prevented by NBI-power deficit and ion-cyclotron fluctuations, which caused anomalous ion losses.…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulation of field reversal in mirror trap with neutral beam injection

Tsidulko

Chernoshtanov

2016

AIP Conference Proceedings

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Abstract. Facility for experimental investigation of field reversal in mirror trap with neutral beam injection is being developed in the Budker INP. Preliminary results of numerical simulation of field reversal in this device are presented. Kinetic instabilities, which cause anomalous losses of fast ions and restrict pressure of ions, are observed in simulations. Methods of suppression of such instabilities are discussed.

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Field-reversal experiments in a neutral-beam-injected mirror machine

Cited by 64 publications

References 27 publications

Electrostatic Plasma-Confinement Experiments in a Tandem Mirror System

Electrostatic Plasma-Confinement Experiments in a Tandem Mirror System

Status of the experiment on magnetic field reversal at BINP

Particle-in-cell simulation of field reversal in mirror trap with neutral beam injection

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