Search

Your search keyword '"Schwartz, Justin"' showing total 538 results
Start Over Author "Schwartz, Justin"
538 results on '"Schwartz, Justin"'

151. Roebel Cable for High-field Low-loss Accelerator Magnets

Author

Turenne, Melanie, Hunte, Frank, Johnson, Rolland, Schwartz, Justin, and Song, Honghai

Subjects
07 Accelerator Technology, Condensed Matter::Superconductivity, T10 Superconducting Magnets, Accelerator Physics
Abstract

High field accelerator magnets are needed for high energy physics applications. Superconducting materials able to reach these fields with low losses are required, and YBCO Roebel cable is being developed to address this issue. Characterization of commercially available Roebel cables for high field low temperature superconducting magnets is needed. YBCO Roebel cable with low AC losses is being developed and has limited commercial availability. Its behavior is not fully understood, however, especially in liquid helium and at high magnetic fields. YBCO Roebel cable will be acquired from a commercial vendor and characterized at cryogenic temperatures, in varying magnetic fields, and different strain configurations. A comprehensive behavior analysis will be performed, including operational and fatigue limits. Characterization of YBCO Roebel cable at low temperatures will be performed, including determination of the current flow path in steady-state and during quench using magneto-optical imaging, investigation of the effects of strand insulation, and examination of the mechanical and quench behavior at 4.2 K, 77 K, and varying magnetic fields., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan

Published
2010
Full Text
View/download PDF

173. Against the Market: Political Economy, Market Socialism and the Marxist Critique

Author

Schwartz, Justin

Subjects
Against the Market (Book), Books -- Book reviews, Political science
Abstract

Against the Market is an ambitious defense of an unpopular position. The crippling defects of Stalinist command economies have led many socialists to advocate versions of (democratic) market socialism, combining [...]

Published
1994

181. YBCO Coated Conductor Development by Non-Vacuum Chemical Processes

Author

FLORIDA STATE UNIV TALLAHASSEE SPONSORED RESEARCH DIV, Schwartz, Justin, FLORIDA STATE UNIV TALLAHASSEE SPONSORED RESEARCH DIV, and Schwartz, Justin

Abstract

The primary focus of the research was to use magneto optical imaging (MOI) to further our understanding of HTS materials. One particular focus was the use of MOI with in-situ tensile straining to image the effects of mechanical strain on the magnetization, which relates to the current carrying capacity of the conductor. To support the analysis of the MOI imaging, and to convert the results from being qualitative to quantitative, techniques were also developed to interpret the image intensities. Scanning electron microscopy was also used to support the MOI research.

Published
2004

182. Risk Mitigation for HTS Motors: Intermediate Temperature (27 K) Strain Effects in Reinforced Bi-Sr-Ca-Cu-O Superconductors

Author

FLORIDA STATE UNIV TALLAHASSEE, Schwartz, Justin, FLORIDA STATE UNIV TALLAHASSEE, and Schwartz, Justin

Abstract

High temperature superconductors , known for their high critical temperatures, also have very high upper critical fields and thus have received significant attention for superconducting magnets (SCMs). To operate in a SCM, however, the superconductor must have high J(sub c) in the presence of high magnetic field and under the action of mechanical strain (Epsilon) that results from the manufacturing processes, differential thermal contraction, and Lorentz forces. For some FITS applications, the effects of mechanical strain on J(sub c) limit the system performance and lifetime, thus posing the most serious risk to successful lifetime operation. Past results at FSU indicated that the effects of longitudinal compression (in the current carrying "ah?' direction) on J(sub c) are critical. These experiments, which studied the effects of longitudinal compression applied at room temperature and at 77 deg K, clearly showed that the effects of strain became more serious as the temperature decreased. Since many applications are expected to operate around 30 deg K, minimizing risk necessitates understanding the effects of abr compressive strains at lower temperature. The NHMFL has recently developed a large bore dewar specifically designed to house a neon liquifier that feeds liquid directly to a large bath-cooled sample space. The sample space is sufficient in size and flexibility to accommodate tensile and compressive experiments on short sample conductors and to perform Lorentz-force tests on coils. Here we report on the progress towards measuring the effects of stress and strain on the transport J(sub c) of BSCCO and YBCO. We report progress on measurements at room temperature and on the development of a fatigue-stress-strain-I(sub c) probe that will operate in conjunction with the liquid neon condenser to facilitate the 27 deg K measurements.

Published
2004

Catalog

Books, media, physical & digital resources
See catalog results