A5004843316- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Physics of Superconductivity and Magnetism
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Quantum chaos and dynamical systems
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Data Storage Technologies
- Quantum, superfluid, helium dynamics
Princeton Plasma Physics Laboratory
2015-2024
Princeton University
2006-2024
University of California, Los Angeles
2022
University of Wisconsin–Madison
2022
General Atomics (United States)
2012-2022
Universität Hamburg
2010-2021
University of California, Davis
2014
University of California, Irvine
2012
Fusion (United States)
2011
Fusion Academy
2011
This article describes Ethernet passive optical networks, an emerging local subscriber access architecture that combines low-cost point-to-multipoint fiber infrastructure with Ethernet. EPONs are designed to carry frames at standard rates. An EPON uses a single trunk extends from central office splitter, which then fans out multiple drop fibers connected nodes. Other than the end terminating equipment, no component in network requires electrical power, hence term passive. Local carriers have...
Using a theoretical framework based on the next-to-leading order QCD-improved effective Hamiltonian and factorization Ansatz for hadronic matrix elements of four-quark operators, we reassess branching fractions in two-body non-leptonic decays $B \to PP, PV, VV$, involving lowest lying light pseudoscalar $(P)$ vector $(V)$ mesons standard model. sensitivity decay rates number colors, $N_c$, as criterion predictivity, classify all current-current (tree) penguin transitions five different...
The SPARC tokamak is a critical next step towards commercial fusion energy. designed as high-field ( $B_0 = 12.2$ T), compact $R_0 1.85$ m, $a 0.57$ m), superconducting, D-T with the goal of producing gain $Q>2$ from magnetically confined plasma for first time. Currently under design, will continue path Alcator series tokamaks, utilizing new magnets based on rare earth barium copper oxide high-temperature superconductors to achieve high performance in device. achievable conservative...
As part of the ITER Design Review and in response to issues identified by Science Technology Advisory Committee, physics requirements were reviewed as appropriate updated. The focus this paper will be on recent work affecting design with special emphasis topics near-term procurement arrangements. This describe results on: sensitivity studies, poloidal field coil requirements, vertical stability, effect toroidal ripple thermal confinement, material choice heat load for plasma-facing...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZeolites versus aluminosilicate clusters: the validity of a local descriptionG. J. Kramer, A. M. De Man, and R. Van SantenCite this: Am. Chem. Soc. 1991, 113, 17, 6435–6441Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.acs.org/doi/10.1021/ja00017a012https://doi.org/10.1021/ja00017a012research-articleACS PublicationsRequest reuse permissionsArticle...
Intense axisymmetric oscillations driven by suprathermal ions injected in the direction counter to toroidal plasma current are observed DIII-D tokamak. The modes appear at nearly half ideal geodesic acoustic mode frequency, plasmas with comparable electron and ion temperatures elevated magnetic safety factor (${q}_{\mathrm{min}}\ensuremath{\ge}2$). Strong bursting frequency chirping observed, concomitant large (10%--15%) drops neutron emission. Large density fluctuations...
Experiments in the DIII-D tokamak show that fast-ion transport suddenly becomes stiff above a critical threshold presence of many overlapping small-amplitude Alfv\'en eigenmodes (AEs). The is phase-space dependent and occurs when particle orbits become stochastic due to resonances with AEs. Above threshold, equilibrium density profiles are unchanged despite increased drive, intermittent losses observed. Fast-ion $\mathrm{D}\ensuremath{\alpha}$ spectroscopy indicates radially localized...
Abstract Negative triangularity (NT) is a potentially transformative configuration for tokamak-based fusion energy with its high-performance core, edge localized mode (ELM)-free edge, and low-field-side divertors that could readily scale to an integrated reactor solution. Previous NT work on the TCV DIII-D tokamaks motivated installation of graphite-tile armor lower outer wall DIII-D. A dedicated multiple-week experimental campaign was conducted qualify scenario future reactors. During...
Recent results on investigations of Alfvén eigenmodes, fast ion confinement and diagnostics in JT-60U are presented. It was found that toroidicity induced eigenmodes (TAEs) were stable negative shear discharges with a large density gradient at the internal transport barrier (ITB). If small ITB, multiple TAEs appeared around q = 2 surface (pitch minimum) showed frequency chirping (Δf ≈ 80 kHz). In low-q positive discharges, location changed from outside to inside 1 surface, owing temporal...
The spatial structure of toroidal Alfv\'en eigenmodes and reversed shear in DIII-D is obtained from electron-cyclotron-emission measurements. Peak measured temperature perturbations are similar magnitude for both found to be $\ensuremath{\delta}{T}_{e}/{T}_{e}\ensuremath{\approx}0.5%$. Simultaneous measurements density fluctuations using beam-emission spectroscopy indicate $\ensuremath{\delta}{n}_{e}/{n}_{e}\ensuremath{\approx}0.25%$. Predictions the perturbation profiles as well...
We calculate the next-to-leading-order cross section for inclusive production of ${D}^{*\ifmmode\pm\else\textpm\fi{}}$ mesons in $p\overline{p}$ collisions as a function transverse momentum and rapidity two approaches using massive or massless charm quarks. For section, we derive limit from theory. find that this differs genuine version with $\overline{\mathrm{M}\mathrm{S}}$ (minimal-subtraction) factorization by finite corrections. By adjusting subtraction terms, establish theory which...
The spectral function of the $^{16}\mathrm{O}$(e,e'p${)}^{15}$N reaction has been measured in quasielastic parallel kinematics. Momentum distributions are extracted for transitions to several discrete states, with emphasis on low-lying positive parity states $^{15}\mathrm{N}$. Spectroscopic factors and bound state wave functions deduced from a DWIA analysis employing five different optical potentials. Coupled channels effects investigated first four $^{15}\mathrm{N}$ found be minimal....
We carry out a systematic study of branching ratios, angular correlations, and $\mathrm{CP}$ asymmetries in the decay neutral charged $B$ mesons to final states consisting two vector mesons. The renormalization-group-improved effective Hamiltonian is evaluated vacuum insertion (factorization) approximation. Okubo-Zweig-Iizuka suppressed annihilation terms are neglected. Current matrix elements using wave functions Bauer, Stech, Wirbel. Branching ratios correlations among subsequent decays...