J. Robinson
A5062431055- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser Design and Applications
- Flow Measurement and Analysis
- Plasma Diagnostics and Applications
- Urban, Neighborhood, and Segregation Studies
- Historical and Linguistic Studies
- Housing, Finance, and Neoliberalism
- Biblical Studies and Interpretation
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Spacecraft and Cryogenic Technologies
- Aluminum Alloy Microstructure Properties
- Advanced X-ray Imaging Techniques
- Solar and Space Plasma Dynamics
- Archaeology and Historical Studies
- Water Systems and Optimization
- Thermal Analysis in Power Transmission
- Solid State Laser Technologies
- Vibration and Dynamic Analysis
- Spacecraft Dynamics and Control
- Urban Planning and Landscape Design
Princeton University
1988-2024
University of Virginia
2021
University of Warwick
2012
Princeton Plasma Physics Laboratory
1985-2008
Oak Ridge National Laboratory
2006-2007
General Atomics (United States)
1992-2006
Higashihiroshima Medical Center
2006
Hiroshima University
2006
Lawrence Livermore National Laboratory
2006
University of California, Irvine
2006
The National Spherical Torus Experiment (NSTX) is being built at Princeton Plasma Physics Laboratory to test the fusion physics principles for spherical torus concept MA level. NSTX nominal plasma parameters are R0 = 85 cm, a 67 R/a ⩾ 1.26, Bt 3 kG, Ip 1 MA, q95 14, elongation κ ⩽ 2.2, triangularity δ 0.5 and pulse length of up 5 s. heating/current drive tools high harmonic fast wave (6 MW, s), neutral beam injection (5 80 keV, s) coaxial helicity injection. Theoretical calculations predict...
Real estate plays an essential part in various sociological theories of political economy, state capacity, racecraft, stratification, and urbanization. However, since foundational insights about the novelty commodified, emplaced private property from theorists like Du Bois Polanyi, these disparate threads have not been tied together into a coherent field study. Here, we review three areas recent scholarship relevant to understanding real estate—the economy place, rights, financialization—in...
The major objective of the National Spherical Torus Experiment (NSTX) is to understand basic toroidal confinement physics at low aspect ratio and high βT in order advance spherical torus (ST) concept. In do this, NSTX utilizes up 7.5 MW neutral beam injection, 6 harmonic fast waves (HHFWs), it operates with plasma currents 1.5 MA elongations 2.6 a field 0.45 T. New facility, diagnostic modelling capabilities developed over past two years have enabled research team make significant progress...
The TFTR Thomson scattering system has been operational since January 1984. diagnostic uses two ruby lasers and spectrometer-detector systems to provide profiles at times in a discharge. lines consist of 76 spatial channels which span the 200-cm vacuum vessel along major radius. detectors are gated, intensified CCD arrays with single photoelectron sensitivity. Te(R) Ne(R) presented.
The main aim of the National Spherical Torus Experiment (NSTX) is to establish fusion physics principles spherical torus (ST) concept. NSTX device began plasma operations in February 1999 and current Ip was successfully brought up design value 1 MA on 14 December 1999. planned shaping parameters, elongation κ = 1.6-2.2 triangularity δ 0.2-0.4, were achieved inner wall limited, single null double diverted configurations. coaxial helicity injection (CHI) high harmonic fast wave (HHFW)...
The National Spherical Torus Experiment (NSTX) has made considerable progress in advancing the scientific understanding of high performance long-pulse plasmas needed for future spherical torus (ST) devices and ITER.Plasma durations up to 1.6 s (five current redistribution times) have been achieved at plasma currents 0.7 MA with non-inductive fractions above 65% while simultaneously achieving β T N values 17% 5.7 (%m -1 ), respectively.A newly available motional Stark effect diagnostic...
The National Spherical Torus Experiment (NSTX) has explored the effects of shaping on plasma performance as determined by many diverse topics including stability global magnetohydrodynamic (MHD) modes (e.g., ideal external kinks and resistive wall modes), edge localized (ELMs), bootstrap current drive, divertor flux expansion, heat transport. Improved capability been crucial to achieving βt∼40%. Precise shape control achieved NSTX using real-time equilibrium reconstruction. simultaneously...
The National Spherical Tokamak Experiment (NSTX) is an ultra low aspect ratio device with a plasma current of 1 MA. tokamak features auxiliary heating and drive close-fitting conducting shell to maximize the pressure. NSTX designed for experimental pulse length that will demonstrate quasi-steady state non-inductively driven advanced operation. design also takes maximum advantage existing facilities components from previous Princeton devices reduce overall program costs.
We describe a powerful picosecond KrF* laser system consisting of synchronously pumped dye oscillator, three-stage amplifier, frequency conversion to 248 nm, and amplification through series excimer modules. Characteristics are given at each stage the system. With first complete, focused intensity ∼1016 W/cm2 is obtained. Initial visible spectra obtained by interaction with various targets presented.
In order to reduce recirculating power fraction acceptable levels, the spherical torus concept relies on simultaneous achievement of high toroidal β and bootstrap in steady state. last year, as a result plasma control system improvements, achievable elongation NSTX has been raised from κ ∼ 2.1 2.6—approximately 25% increase. This increase led substantial for long pulse discharges. The is associated with an current at nearly fixed poloidal β, which enables higher βt constant fraction. As...
In this research note, we describe how theories of racial capitalism offer important insights into social psychological processes discrimination, stereotyping, and more. First, the framework sheds light on material conditions that shape aspects domination oppression, including identity formation. Second, thinkers have emphasized instrumentalizes differentiation to spur accumulation. Third, points intersectionality as key understanding social-structural factors experiences effects...
The measurement of wall shear stress is increasingly recognized as a critical element aerodynamic testing. Wall necessary to characterize fully wall-bounded flow, provide information for computational simulations, and serve sensitive quantity use in flow-control applications. Oil-film interferometry method that can be used measure quickly accurately, but the analysis interferograms complex has limited methods use. OILFILMTOOL Matlab program been developed simplify process. steps required...
A variety of magnetohydrodynamic (MHD) phenomena have been observed on NSTX. Many these affect fast particle losses, which are major concern for future burning plasma experiments. Usual diagnostics studying arrays Mirnov coils magnetic oscillations and p-i-n diode soft x-ray emission from the core. Data reported here a unique imaging camera (FSXIC) with wide-angle (pinhole) tangential view entire minor cross section. The provides 64×64 pixel image, charge coupled device chip, light resulting...
The National Spherical Tokamak Experiment (NSTX) is an ultra low aspect ratio (R/a=1.25; R=80 cm) device designed for a plasma current of 1 MA. It features auxiliary heating and drive close-fitting conducting shell to maximize pressure (43% beta). NSTX 5 sec. experimental pulse demonstrate quasi-steady state non-inductively driven advanced tokamak operation. design takes maximum advantage existing components facilities from previous devices at PPPL reduce the program costs. will be sited in...
The effects of spatially varying magnetic field strength on the scaling properties plasma turbulence, modelled by an extended form Hasegawa-Wakatani model, are investigated. We study changes in intermittency velocity, density, and vorticity fields, as functions inhomogeneity C=−∂ ln B/∂x. While velocity fluctuations always self-similar their is unaffected value C, levels density change with parameter reflecting morphological coherent structures due to interchange mechanism. Given centrality...
The visibility of populations, policies, and the state matters greatly for questions power, inequality, democratic life. This article builds on existing scholarship by examining how operates as a lever effect social control in racially economically stratified society. By doing so, identifies paradox. Race- class-empowered groups often pressure actors to implement punitive policies or otherwise visibly contain disadvantaged populations. But they also tend decry disavow necessary public costs...
“Knowledge infrastructures” are critical to producing research and spurring action on policy issues. We argue that the existing infrastructure of knowledge housing problems in United States is ill-suited for understanding issues quality deterioration. Specifically, we principal national database quality, American Housing Survey, seriously flawed. After identifying specific blind spots, develop an alternative approach—one community-driven pragmatic—for better apprehending this problem. Our...
The scientific parameters and the technology issues for a modest size spherical torus (ST) at 10 MA plasma current are discussed. This class of devices includes DT-capable ST experiment (DTST, R0 = 1.2 m) extended performance tests limited pulse lengths neutron fluences, volume source (VNS, 1.1 steady state energy testing to high fluences. interest DTST include non-inductive ramp-up on timescale (∼30 s), confinement needed Q burn, behaviour energetic particles, physics techniques handle...
The NSTX (National Spherical Torus Experiment) facility located at Princeton Plasma Physics Laboratory is the newest national fusion science experimental for restructured US Fusion Energy Science Program. project was approved in FY 97 as first proof-of-principle dedicated to spherical torus research. On Feb. 15, 1999, plasma achieved 10 weeks ahead of schedule. completed on budget and with an outstanding safety record. This paper gives overview construction initial operations.
We are installing a diagnostic system based on neutral lithium beam to investigate plasma behavior in the edge region of DIII-D discharges [D. M. Thomas et al., Rev. Sci. Instrum. 61, 3040 (1990]. The will provide equivalent current densities several mA/cm2 at energies from 5 30 keV, sufficient penetrate centimeters past last closed flux surface most operating regime. Fluorescence atoms is induced by collisions with particles and sensitive measure density behavior. emitted 670.8-nm...