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in subjects: "Pulse Circuits"

open access

Advanced power conversion based on the Aerocapacitor{trademark}

The authors report here, for the first time, high frequency testing of a new type of electrochemical double layer capacitor (EDLC), based on carbon aerogels: the Aerocapacitor. Carbon aerogels, are a novel type of carbon foam developed by Lawrence Livermore National Laboratory for military applications. The unique properties of carbon aerogels, high surface area (700 m{sup 2}/g), high density (1g/cc), well controlled pore diameter and high material conductivity (25 S/cm) made it an ideal EDLC e… more

Date: October 1997

Creator: Josephs, L. C.; Gregory, D. & Roark, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pulse transformer R and D for NLC klystron pulse modulator

The authors have studied a conventional pulse transformer for the NLC klystron pulse modulator. The transformer has been analyzed using a simplified lumped circuit model. It is found that a fast rise time requires low leakage inductance and low distributed capacitance and can be realized by reducing the number of secondary turns, but it produces larger pulse droop and requires a larger core size. After making a tradeoff among these parameters carefully, a conventional pulse transformer with a r… more

Date: July 1, 1997

Creator: Akemoto, M.; Gold, S.; Krasnykh, A. & Koontz, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Ranchero explosive pulsed power system

The authors are currently developing a high explosive pulsed power system concept that they call Ranchero. Ranchero systems consist of series-parallel combinations of simultaneously initiated coaxial magnetic flux compression generators, and are intended to operate in the range from 50 MA to a few hundred MA currents. One example of a Ranchero system is shown here. The coaxial modules lend themselves to extracting the current output either from one end or along the generator midplane. They have… more

Date: September 1, 1997

Creator: Goforth, J.H.; Atchison, W.L. & Bartram, D.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Linear hybrid kicker modulator for ETA-II

A new type of pulse modulator is being developed at Livermore that will rapidly split a high current electron beam into two halves, enabling each half to proceed along separate pathways. Each modulator will be capable of applying a {+-}10kV, 200A pulse onto a transmission line electrode structure with a rise time less than 10 ns, a pulse repetition frequency greater than 1 MHz, and a maximum pulse duration of 400 ns. The electrode structure, located inside the beam-transport pipe, generates an … more

Date: June 29, 1997

Creator: Buckles, R.; Davis, B. & Yen, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Plastic Laminate Pulsed Power Development

The desire to move high-energy Pulsed Power systems from the laboratory to practical field systems requires the development of compact lightweight drivers. This paper concerns an effort to develop such a system based on a plastic laminate strip Blumlein as the final pulseshaping stage for a 600 kV, 50ns, 5-ohm driver. A lifetime and breakdown study conducted with small-area samples identified Kapton sheet impregnated with Propylene Carbonate as the best material combination of those evaluated. … more

Date: September 1, 2000

Creator: Alexander, Jeff A.; Shope, Steven L.; Pate, Ronald C.; Rinehart, Larry F.; Jojola, John M.; Ruebush, Mitchell H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A low-power, CMOS peak detect and hold circuit for nuclear pulse spectroscopy

A low-power CMOS peak detecting track and hold circuit optimized for nuclear pulse spectroscopy is presented. The circuit topology eliminates the need for a rectifying diode, reducing the effect of charge injection into the hold capacitor, incorporates a linear gate at the input to prevent pulse pileup, and uses dynamic bias control that minimizes both pedestal and droop. Both positive-going and negative-going pulses are accommodated using a complementary set of track and hold circuits. Full ch… more

Date: December 31, 1994

Creator: Ericson, M. N.; Simpson, M. L.; Britton, C. L.; Allen, M. D.; Kroeger, R. A. & Inderhees, S. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A high voltage pulse generator for the mod-anode of the cluster klystron

A high voltage pulse generator using Zarem type was developed. The advantage of the Zarem type circuit is that it does not require a matched load. In our case the purser is dedicated to drive a mod-anode, which is a capacitive load. Therefore the Zarem type circuit is desirable. This report addresses systematically the R & D work, including the basic Principle and the designing consideration, the low voltage and high voltage experiments. A lot of irregular phenomena were observed, including rin… more

Date: October 1, 1995

Creator: Zhao, Yongxiang & Wang, Hai-peng

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Prospectus of ignition enhancement in a two-stroke SI engine

Conventional two-stroke spark-ignition (SI) engines have difficulty meeting the ignition requirements of lean fuel-air mixtures and high compression ratios, due to their breaker operated, magneto-coil ignition systems. In the present work, a breakerless, high-energy electronic ignition system was developed and tested with and without a platinum-tipped electrode spark plug. The high-energy ignition system showed an improved lean-burn capability at high compression ratios relative to the conventi… more

Date: December 1, 1995

Creator: Manivannan, P.V.; Ramesh, A.; Poola, R.B. & Dhinadgar, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of solid-state induction modulators for high PRF accelerators

Researchers at the Lawrence Livermore National Laboratory and EG&G Energy Measurements are developing a new solid-state power system for two proposed accelerators. One of the accelerators is a circular arrangement of induction cells called a recirculator. It is designed to accelerate heavy ions for an inertial fusion study that proposes to substitute heavy-ion beams for laser beams as the driver for fusion targets. The other accelerator is a linear induction accelerator for electron beams calle… more

Date: July 5, 1995

Creator: Kirbie, H.; Hawkins, S. & Hickman, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Unique Signal Override Plug electromagnetic test report

The MC4039 Unique Signal Override Plug (USOP) provides the unique signal for the B90 when fielded on aircraft that are not equipped with unique signal capability. Since the USOP is field installed, the concern is that it might be susceptible to electromagnetic radiation prior to installation on the weapon. This report documents a characterization of the USOP, evaluates various techniques for attaching electromagnetic shields, and evaluates the susceptibility of a fully assembled passive-USOP. T… more

Date: October 1, 1990

Creator: Bonn, Russell H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pulsed power supply for PAR injection/extraction septum magnet

A 22.5 {mu}H, 22.5 m{Omega} transformer septum magnet must be pulsed at a 60 Hz rate to inject beam from a 450 MeV positron linac into a positron accumulator ring (PAR) and to extract beam from it. Of the 60 pulses per second the first 24 are used for injection and the 30th for extraction. The 25th through the 29th are not used. This pattern is repeated continuously. A design study was performed of the power supply proposed in the APS Title I design. This supply produces a pulse that is approxi… more

Date: September 23, 1990

Creator: McGhee, D. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Scintillation techniques and optical devices: summary report of the working group

Use of optical fiber techniques particularly in particle tracking is discussed. Fundamental aspects of scintillating tracking detectors using the fiber-optic waveguide are described, including candidate core materials, fiber manufacture, properties of the scintillation materials and waveguides, attenuation length, and radiation resistance. The general consensus is expressed that most of the basic building blocks needed for fiber detector readout exist but require optimization. Attention is give… more

Date: February 1, 1986

Creator: Bross, A. & Ruchti, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Rabbit System. Low cost, high reliability front end electronics featuring 16 bit dynamic range. [Redundant Analog Bus Based Information Transfer]

A new crate-based front end system has been built which features low cost, compact packaging, command capability, 16 bit dynamic range digitization, and a high degree of redundancy. The crate can contain a variety of instrumentation modules, and is designed to be situated close to the detector. The system is suitable for readout of a large number of channels via parallel multiprocessor data acquisition.

Date: October 1, 1985

Creator: Drake, G.; Droege, T. F.; Nelson, C. A., Jr.; Turner, K. J. & Ohska, T. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Data acquisition system for the Large Scintillating Neutrino Detector at Los Alamos

The data acquisition system for the Large Scintillating Neutrino Detector (LSND) is described. The system collects time and charge information in real time from 1600 photomultiplier tubes and passes the data in intelligent-trigger selected time windows to analysis computers, where events are reconstructed and analyzed as candidates for a variety of neutrino-related physics processes. The system is composed of fourteen VME crates linked to a Silicon Graphics, Inc. 4D/480'' multiprocessor compute… more

Date: January 1, 1992

Creator: Anderson, G.; Cohen, I.; Homann, B.; Smith, D.; Strossman, W.; VanDalen, G. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and operating experience with electric systems for high rate liquid argon calorimeters

A number of experiments have been instrumented by an ADC scheme utilizing an integrated amplifier, a packaged delay line, the difference of two samples taken Before and After the signal exits the delay, and a multiplexer to a single ADC for a system. Design features, operating peculiarities, and experience to date are discussed.

Date: January 1, 1979

Creator: Droege, T. F.; Hibbard, M. C.; Nelson, C. A., Jr.; Thompson, P. A.; Makdisi, Y. & Lipton, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department