P. T. Bonoli
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View article: Effects of midplane density gradient in the propagation of High-Harmonic Fast Waves considering high temperature anisotropy in the Scrape-Off Layer of NSTX-U
Effects of midplane density gradient in the propagation of High-Harmonic Fast Waves considering high temperature anisotropy in the Scrape-Off Layer of NSTX-U Open
High-Harmonic Fast Wave (HHFW) heating experiments in NSTX have shown that up to 60% of the injected power can be lost in the Scrape-Off Layer (SOL) when the density is above the fast wave cutoff density in front of the antenna, for which …
View article: Feasibility of main thermal ion heating by ICRF waves using a top launcher in a tokamak with deuterium–tritium plasmas
Feasibility of main thermal ion heating by ICRF waves using a top launcher in a tokamak with deuterium–tritium plasmas Open
A scenario of ion cyclotron range of frequency (ICRF) wave injection from a top launcher is proposed as an efficient and direct heating method for thermal deuterium ions in deuterium–tritium tokamak plasmas. Positioned between the tritium …
View article: Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST
Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST Open
Recent radio frequency (RF) current drive experiments in EAST provide an opportunity to investigate RF synergy effects between electron cyclotron (EC) and lower hybrid (LH) current drive. Synergy current is the excess current that can aris…
View article: Turbulence suppression at extreme plasma densities on DIII-D and EAST
Turbulence suppression at extreme plasma densities on DIII-D and EAST Open
Recent high-poloidal-beta (high-βP) experiments on DIII-D and EAST have made coordinated breakthroughs for high confinement quality at high density near the Greenwald limit. Density gradient amplification of turbulence suppression at high …
View article: DIII-D research to provide solutions for ITER and fusion energy
DIII-D research to provide solutions for ITER and fusion energy Open
The DIII-D tokamak has elucidated crucial physics and developed projectable solutions for ITER and fusion power plants in the key areas of core performance, boundary heat and particle transport, and integrated scenario operation, with clos…
View article: Optimization of the N∥ Upshift in the DIII-D high field side lower hybrid current drive experiment
Optimization of the N∥ Upshift in the DIII-D high field side lower hybrid current drive experiment Open
High field side lower hybrid current drive (LHCD) is one potential candidate for efficient non-inductive current drive in tokamak power plants, and the first test of this technology will occur on the DIII-D tokamak during the 2024 campaign…
View article: NSTX-U research advancing the physics of spherical tokamaks
NSTX-U research advancing the physics of spherical tokamaks Open
The objectives of NSTX-U research are to reinforce the advantages of STs while addressing the challenges. To extend confinement physics of low- A , high beta plasmas to lower collisionality levels, understanding of the transport mechanisms…
View article: Using the Stix finite element RF code to investigate operation optimization of the ICRF antenna on Alcator C-Mod
Using the Stix finite element RF code to investigate operation optimization of the ICRF antenna on Alcator C-Mod Open
As the Ion Cyclotron Radio Frequency range (ICRF) heating becomes more favorable in fusion devices, the urgency of predicting and mitigating impurity generation that arises from it becomes more pressing. In the ICRF regime, rectified Radio…
View article: Development of Impedance Sheath Boundary Condition in Stix Finite Element RF Code
Development of Impedance Sheath Boundary Condition in Stix Finite Element RF Code Open
Ion cyclotron radio frequency range (ICRF) power plays an important role in heating and current drive in fusion devices. However, experiments show that in the ICRF regime there is a formation of a radio frequency (RF) sheath at the materia…
View article: Plasma heating by electron cyclotron wave and the temperature effects on lower hybrid current drive on EAST
Plasma heating by electron cyclotron wave and the temperature effects on lower hybrid current drive on EAST Open
This paper presents the progress in the long—pulse operation of the electron cyclotron (EC) system and the achievements in high—electron temperature plasmas by the combined EC and lower hybrid (LH) waves heating since the EC system was bui…
View article: Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST
Realization of thousand-second improved confinement plasma with Super I-mode in Tokamak EAST Open
Mastering nuclear fusion, which is an abundant, safe, and environmentally competitive energy, is a great challenge for humanity. Tokamak represents one of the most promising paths toward controlled fusion. Obtaining a high-performance, ste…
View article: Spectral broadening from turbulence in multiscale lower hybrid current drive simulations
Spectral broadening from turbulence in multiscale lower hybrid current drive simulations Open
The scattering of lower hybrid (LH) waves due to scrape-off layer (SOL) filaments is investigated. It is revealed that scattering can account for the LH spectral gap without any ad hoc modification to the wave-spectrum. This is shown using…
View article: Electron cyclotron heating studies of the Compact Ignition Tokamak (CIT)
Electron cyclotron heating studies of the Compact Ignition Tokamak (CIT) Open
The Compact Ignition Tokamak (CIT) operating scenario calls for ramping the toroidal magnetic field from B/sub T/ = 7.0 (8.0) to 10.0 Tesla in a few seconds, followed by a burn cycle and a ramp-down cycle. Simultaneously, the plasma must b…
View article: Fusion Energy Sciences Network Requirements Review (Final Report)
Fusion Energy Sciences Network Requirements Review (Final Report) Open
The Energy Sciences Network (ESnet) is the high-performance network user facility for the US Department of Energy (DOE) Office of Science (SC) and delivers highly reliable data transport capabilities optimized for the requirements of data-…
View article: Impact of lithium wall conditioning and wave-frequency on high density lower hybrid current drive experiment on EAST
Impact of lithium wall conditioning and wave-frequency on high density lower hybrid current drive experiment on EAST Open
A series of dedicated lower hybrid current drive (LHCD) experiments on EAST shows that lithium wall conditioning extends LH current drive and heating up to the line-averaged density of n ̅_e≈ 4x1019 m-3 for both 2.45 and 4.6 GHz. Current dr…
View article: DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy
DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy Open
DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, c…
View article: Scoping study of lower hybrid current drive for CFETR
Scoping study of lower hybrid current drive for CFETR Open
The paper assesses the applicability of lower hybrid current drive (LHCD) for two potentialoperating scenarios for the china fusion engineering test reactor (CFETR): the ‘hybrid’scenario in which some of the plasma current is sustained by …
View article: Effect of edge plasma density on hot spot in LHCD plasma in EAST
Effect of edge plasma density on hot spot in LHCD plasma in EAST Open
Hot spots are a serious challenge limiting long pulse operation with lower hybrid current drive (LHCD) in tokamaks. Here, in order to mitigate hot spots in the guard limiter and improve LHCD capability, the effect of edge plasma density on…
View article: The mission and physics design of TPX
The mission and physics design of TPX Open
The mission of the Tokamak Physics Experiment (TPX) is to develop the scientific basis for an economic, compact, and steady-state tokamak fusion reactor. This will require the development and demonstration of stable, steady-state tokamak o…
View article: Investigations of LHW-plasma coupling and current drive at high density related to H-mode experiments in EAST
Investigations of LHW-plasma coupling and current drive at high density related to H-mode experiments in EAST Open
Two important issues in achieving lower hybrid current drive (LHCD) high confinement plasma in EAST are to improve lower hybrid wave (LHW)-plasma coupling and to drive the plasma current at a high density. Studies in different configuratio…
View article: 1st Computational Physics School for Fusion Research (2019 CPS-FR)
1st Computational Physics School for Fusion Research (2019 CPS-FR) Open
The rising number of applications of machine learning and computational statistics in fusion energy research requires flexibility in adopting a growing variety of tools. The Computational Physics School for Fusion Research (CPS-FR) aims at…
View article: Importance of theory, computation and predictive modeling in the US magnetic fusion energy strategic plan
Importance of theory, computation and predictive modeling in the US magnetic fusion energy strategic plan Open
Based on the community input at the National Academy of Sciences (NAS) Madison and Austin workshops in July and December 2017, respectively, this whitepaper was prepared and submitted to the NAS in the category of US fusion theory and comp…
View article: Study of turbulence-induced refraction of lower hybrid waves using synthetic scrape-off layer filaments
Study of turbulence-induced refraction of lower hybrid waves using synthetic scrape-off layer filaments Open
Turbulence-induced refraction effects to lower hybrid (LH) wave propagation and current drive are studied using synthetic scrape-off layer (SOL) blob/filament fields. A synthetic 3D, field-following, blob turbulence model is implemented in…
View article: Generation of localized lower-hybrid current drive by temperature perturbations
Generation of localized lower-hybrid current drive by temperature perturbations Open
Despite high demonstrated efficiency, lower-hybrid current drive (LHCD) has not been considered localized enough for neoclassical tearing mode (NTM) stabilization in tokamaks. This assessment must be reconsidered in view of the RF current …