6 research outputs found
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Real Time Control System for the National Spherical Torus Experiment (NSTX)
The NSTX is a national facility for the study of plasma confinement, heating, and current drive in a low aspect ratio, spherical torus (ST) configuration. The ST configuration is an alternate magnetic confinement concept which is characterized by high {beta} (ratio plasma pressure to magnetic field pressure) and low toroidal field compared to conventional tokamaks, and could provide a pathway to the realization of a practical fusion power source. The NSTX depends on a real time, high speed, synchronous, and deterministic control system acting on a system of thyristor rectifier power supplies to (1) establish the initial magnetic field configuration; (2) initiate plasma within the vacuum vessel; (3) inductively drive plasma current; and (4) control plasma position and shape. For the initial ''day 0'' 1st plasma operations (Feb. 1999), the system was limited to closed loop proportional-integral current control of the power supplies based on preprogrammed reference waveforms. For the next ''day 1'' phase of operations beginning mid-summer 1999 the loop will be closed on plasma current and position. The ultimate ''day 2'' system is envisioned to include real time reconstruction of the plasma internal current distribution so that control can be exercised over internal plasma parameters such as current and pressure profile. This paper addresses the day 1 system, with emphasis on the magnet power supply control. Companion papers address plasma control
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Fast Particle Excitation of TAEs in NSTX
A broad spectrum of TAEs may be unstable in NSTX. TAEs are found having global radial structure. Alfven continuum gap exist even at high beta plasma, when TAE modes are present. TAEs may have strong drive {gamma}/{omega} > 30%, which requires developing of nonperturbative codes for more robust calculations. Single and two mode calculations predict highest beam ion losses totaling in high beta high-q{sub 0} plasmas {approximately} 30% of the NBI ion population with FLR effects included, where most of the losses are prompt losses (24%). Improved confinement (vs typical tokamak plasmas) is observed in high beta plasmas because of the presence of the magnetic field well and strong poloidal field at the edge. The results from START experiments need to be analyzed to provide the understanding of TAEs drive and damping in ST
Normative Challenges of Identification in the Internet of Things: Privacy, Profiling, Discrimination, and the GDPR
Informed Consent for Research Using Biospecimens, Genetic Information and Other Personal Data
The Long-Term Care Insurance Program in Israel: solidarity with the elderly in a changing society
<p>Abstract</p> <p>The Long-Term Care Insurance Program (LTCIP) in Israel is a social security program administered by the National Insurance Institute (NII) since 1988. LTCIP focuses on home-based personal care services. Differently from most other programs under the responsibility of the NII, LTCIP benefits are in-kind benefits and are delivered via multiple for-profit and not-for-profit organizations. In recent years LTCIP has been the target of various legal amendments and numerous administrative changes. While many of these changes may have had significant effects on individuals, they have not altered the fundamental principles of the program. Thus, many of the characteristics of beneficiaries have remained quite stable over the years; other characteristics of the population of beneficiaries have changed over the years reflecting the aging of Israeli society. A central issue related to LTCIP is whether benefits are adequate to meet the needs of the growing elderly population of Israel. While the generosity of LTCIP benefits is questionable, economic and political struggles have limited the scope of changes introduced thus far.</p