Temperature Diagnostics for Field-Reversed Configuration Plasmas on the Pulsed High Density (PHD) Experiment

Gota, H.; Andreason, Samuel; Votroubek, George; Pihl, Chris; Slough, John

doi:10.1585/pfr.2.s1050

Cited by 2 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As expected, simulations show the formation of a pre-sheath potential, and consequently the parallel electron heat losses are reduced to a level close to the minimal theoretical limit. This result has been validated [34] by experimental measurements (see also [10]).…”

Section: Parallel Electron Transportsupporting

confidence: 65%

“…This allows an elevated density layer to build up in the SOL in the presence of edge fueling by gas injection. Such edge-peaked density profiles have been routinely measured by Thomson scattering over hundreds of shots on the experiment where edge fueling has been used [10].…”

Section: Equilibriummentioning

confidence: 99%

“…The density peak outside the separatrix is consistent with experimental observations for shot 119701 which had edge fueling by gas injection. This equilibrium reconstruction may be compared with the experimental results of [10]. The above method for equilibrium reconstruction is fairly labor intensive, but it captures the energetic ion component and the details of the experimental density and temperature profiles, which are needed for simulations of perpendicular turbulent transport in section 3.1 below.…”

Section: Equilibriummentioning

confidence: 99%

“…In addition, lower plasma density near target walls causes increase of the Debye length which further decreases surface electric field. The favorable role of the expander has been demonstrated in the gas dynamic trap (GDT) experiment, where electron temperature has been enhanced to 800 eV by ECRH and neutral beams in the presence of magnetic expander divertor [28][29][30], and in the C-2W experiment, where electron temperature has been enhanced to 500 eV [10]. (The physics of the parallel electron transport in these two devices is expected to be very similar, development goals of the two concepts are different as GDT is currently being explored as a neutron source [31] while the advanced FRC, with its high β and, high potential fusion power output, is being as a fusion reactor for electricity production.…”

Section: Parallel Electron Transportmentioning

confidence: 99%

“…The SOL flows along the axis through a magnetic mirror into a field expander divertor. See [10] in these proceedings for more details.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Simulation of equilibrium and transport in advanced FRCS

Dettrick¹,

Barnes²,

Ceccherini³

et al. 2021

Nucl. Fusion

View full text Add to dashboard Cite

The advanced beam-driven FRC is a field reversed configuration (FRC) with the addition of neutral beam (NB) injection, electrode biasing, and magnetic expander divertors. The resulting configuration has novel features that make it necessary to revisit many key results in FRC theory. Three of these features include (i) a large energetic ion population, (ii) in-principle capability to adjust the electric field and rotation profiles, and (iii) a combination of magnetic and electrostatic confinement of electrons in the SOL. In some fueling scenarios the electron density profile may exhibit a significant peak outside of the separatrix. To explore these features a hybrid fluid/kinetic equilibrium model has been used to reconstruct typical experimental profiles of the C-2W experiment. Results indicate that the energetic ions provide at least 50% of the total plasma pressure. These equilibrium profiles have been used as initial conditions for global, cross-separatrix, turbulent transport simulations using the 3D electrostatic particle-in-cell code ANC. Electrostatic fluctuations were found to nonlinearly saturate at an amplitude which is an order magnitude lower than that observed previously. The tokamak turbulence code GTC code has also been extended to handle FRC physics in the new GTC-X version, which has been used to perform simulations of turbulent transport in the SOL relevant to electrode biasing. It is found that equilibrium E × B flow shear significantly decreases ion temperature gradient saturation amplitude and ion heat transport. Also in the SOL, a 1D2V continuum code has been developed and applied to parallel electron heat transport. Results show the formation of pre-sheath potential and reduction of parallel electron heat loss close to the ideal ambipolar limit, a result which has been validated by experimental diagnostics. These transport modifications caused by the three novel configuration features help to explain the remarkable plasma performance of the C-2W experiment.

show abstract

Section: Parallel Electron Transportsupporting

confidence: 65%

Section: Equilibriummentioning

confidence: 99%

Section: Equilibriummentioning

confidence: 99%

Section: Parallel Electron Transportmentioning

confidence: 99%

“…The SOL flows along the axis through a magnetic mirror into a field expander divertor. See [10] in these proceedings for more details.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of equilibrium and transport in advanced FRCS

Dettrick¹,

Barnes²,

Ceccherini³

et al. 2021

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Shikhovtsev,

Ivanov,

Davydenko

et al. 2024

J. Plasma Phys.

View full text Add to dashboard Cite

An overview of the neutral beam injectors developed at the Budker Institute of Nuclear Physics in Novosibirsk during the last 10 years is presented. These neutral injectors are used for plasma diagnostics, heating and current drive in modern fusion devices with magnetic confinement. An arc or a radio-frequency (RF) discharge generates a plasma in the ion sources of the injectors, and a positive hydrogen or deuterium ion beam is extracted and accelerated by a multiaperture ion-optical system (IOS). The accelerated ion beam is converted into a neutral one in a gas target. The precision multiaperture IOS with spherically concave electrodes provides ballistic focusing of the neutral beam. The high-energy, high-power beam injector based on negative ions, which is currently under development, is described as well. It comprises a RF negative ion source and a wide-aperture electrostatic accelerator separated from the source by a low-energy beam transport line, thereby improving the injector reliability.

show abstract

Temperature Diagnostics for Field-Reversed Configuration Plasmas on the Pulsed High Density (PHD) Experiment

Cited by 2 publications

References 4 publications

Simulation of equilibrium and transport in advanced FRCS

Simulation of equilibrium and transport in advanced FRCS

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

Contact Info

Product

Resources

About