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Discharge circuits and loads

Description: This will be an overview in which some of the general properties of loads are examined: their interface with the energy storage and switching devices; general problems encountered with different types of loads; how load behavior and fault modes can impact on the design of a power conditioning system (PCS).
Date: October 15, 1980
Creator: Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Dc power supplies and hard-tube power conditioning systems

Description: In this lecture, we shall discuss some of the major characteristics of dc power supplies and hard-tube pulsers, along with many of their PCS limiting properties and several of the more powerful vacuum tubes that are currently available for larger hard-tube pulsers systems. The initial topic will be elementary dc power supplies, operating with standard 60 Hz AC input power. The full-wave bridge design will be discussed in detail, illustrating the majority of the significant circuit parameters.
Date: January 1, 1980
Creator: Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Lecture 1: introduction to power conditioning systems

Description: The purpose of the course is to present an overview of the power conditioning aspects of energy transfer systems. The objective, then, is to develop an understanding and appreciation of the physical processes that govern the performance of these systems, including the role of such elements as switches, capacitors, inductors, and resistors. Secondly, to discuss where are the sources of information once a problem area has been identified. All the information will be current and state-of-the-art, and directed toward these pulse components, with particular emphasis on the area of high-repetition-rate systems, as these are taking on ever increasing significance.
Date: January 1, 1980
Creator: Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Energy storage capacitors

Description: The properties of capacitors are reviewed in general, including dielectrics, induced polarization, and permanent polarization. Then capacitance characteristics are discussed and modelled. These include temperature range, voltage, equivalent series resistance, capacitive reactance, impedance, dissipation factor, humidity and frequency effects, storage temperature and time, and lifetime. Applications of energy storage capacitors are then discussed. (LEW)
Date: January 1, 1984
Creator: Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Electromechanical shock in pulse power components

Description: Most components used in high power pulse generators undergo mechanical shock stresses during the pulse or on its leading edge. As power densities become very high, this shock may lead to anomalous behavior as well as introduce failure modes that may not be immediately obvious. It has been shown that acoustic shock waves traveling within spark gap electrodes can affect electrode erosion by as much as an order of magnitude. Thus, a new point of view is required for component design where shock may be a critical factor. The mechanisms for generation of shock forces, both thermal and electromagnetic, are reviewed and applied to resistors, capacitors, magnetic devices and switches. The mechanisms described are square law effects so that it can be concluded that for high energy pulses, mechanical shock stress will be a critical factor in component survival.
Date: January 1, 1980
Creator: Burkes, T.R. & Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Sub-nanosecond jitter, repetitive impulse generators for high reliability applications

Description: Low jitter, high reliability impulse generator development has recently become of ever increasing importance for developing nuclear physics and weapons applications. The research and development of very low jitter (< 30 ps), multikilovolt generators for high reliability, minimum maintenance trigger applications utilizing a new class of high-pressure tetrode thyratrons now commercially available are described. The overall system design philosophy is described followed by a detailed analysis of the subsystem component elements. A multi-variable experimental analysis of this new tetrode thyratron was undertaken, in a low-inductance configuration, as a function of externally available parameters. For specific thyratron trigger conditions, rise times of 18 ns into 6.0-..cap omega.. loads were achieved at jitters as low as 24 ps. Using this database, an integrated trigger generator system with solid-state front-end is described in some detail. The generator was developed to serve as the Master Trigger Generator for a large neutrino detector installation at the Los Alamos Meson Physics Facility.
Date: January 1, 1981
Creator: Krausse, G.J. & Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Critical pulse power components

Description: Critical components for pulsed power conditioning systems will be reviewed. Particular emphasis will be placed on those components requiring significant development efforts. Capacitors, for example, are one of the weakest elements in high-power pulsed systems, especially when operation at high-repetition frequencies for extended periods of time are necessary. Switches are by far the weakest active components of pulse power systems. In particular, opening switches are essentially nonexistent for most applications. Insulaton in all systems and components requires development and improvement. Efforts under way in technology base development of pulse power components will be discussed.
Date: January 1, 1981
Creator: Sarjeant, W.J. & Rohwein, G.J.
Partner: UNT Libraries Government Documents Department

Development of high-reliability, multikilohertz repetition-rate, fast-discharge components

Description: The two basic components in pulsed-power technology are capacitors and switches. In order to develop these high-voltage components, a unique laboratory has been constructed using state-of-the-art diagnostic and shielding techniques. The laboratory is comprised of three basic systems: charging systems, (2) diagnostic systems, and (3) grounding and shielding systems.
Date: January 1, 1980
Creator: McDuff, G.; Rust, K.; Sarjeant, W.J. & Mace, P.N.
Partner: UNT Libraries Government Documents Department

Fast-extraction modulators for Los Alamos Scientific LaboratorY Proton Storage Ring

Description: The development of a short-bunch mode fast-extraction modulator for the LASL proton storage ring has made necessary the design and development of a resonant transformer charging circuit and the design of a new FIB line circuit to provide bipolar pulse outputs with low prepulse, postpulse, and an optimum high-voltage switch environments. The systems are now being developed to operate reliably at the high-average powers required. The short-bunch mode fast-extraction modulator prototype is presently operating. The initial construction of the long-bunch mode fast-extraction modulator prototype is under way, with results expected within the year.
Date: January 1, 1980
Creator: Nunnally, W.C.; Hudgings, D.W. & Sarjeant, W.J.
Partner: UNT Libraries Government Documents Department

Partial discharge characteristics of liquid-impregnated laminate dielectric structures

Description: Foil-edge partial discharge phenomena in high energy density, spirally-wound capacitors have been investigated. A partial discharge dependency on V has been found to exist in liquid-impregnated, laminar plastic film dielectric structures. Experiments support the hypothesis that electric charges are injected into the dielectric regions near the foil edge by field-controlled charge injection during impressed voltage transients. The resulting conduction current space charge can establish equilibrium by reduction of the electric field intensity below the partial discharge inception threshold. A temporal characterization of this space charge injection is discussed relative to the effect on partial discharge inception at the foil edge.
Date: January 1, 1981
Creator: Bickford, K.J.; Sarjeant, W.J. & Mauldin, G.H.
Partner: UNT Libraries Government Documents Department

Field grading in capacitor margins

Description: Some of the results of modeling electric fields in the margin of a bogey plastic film liquid impregnant capacitor are presented where effects of foil edge shape, different impregnants, and grading wires are examined. It is concluded that placement tolerance and connection problems make grading wires impractical and that folded foil edges are still the best solution to field grading. (WHK)
Date: January 1, 1981
Creator: Springer, T.E.; Sarjeant, W.J. & Nunnally, W.C.
Partner: UNT Libraries Government Documents Department