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NIF Power Conditioning System Testing at LLNL

Description: The National Ignition Facility (NIF) is now under construction at the Lawrence Livermore National Laboratory (LLNL). The Power Conditioning System (PCS) for NIF, when completed will consist of a 192 nearly identical 2 megajoule capacitor storage banks driving 7680 two meter long flashlamps. A fully integrated single-module test facility was completed in August of 2000 at LLNL. The purpose to the Test Facility is to conduct Reliability and Maintainability (RAM) testing of a true ''First Article'… more
Date: June 5, 2001
Creator: Fulkerson, E S; Newton, M; Hulsey, s; Hammon, J & Moore, W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

D0 General Support: The Use of Programmable Logic Controllers (PLCS) at D0

Description: With the exception of control of heating, ventilation, and air conditioning (HVAC) ventilation fans, and their shutdown in the case of smoke in the ducts, all implementations of Programmable Logic Controllers (PLCs) in Dzero have been made within the fundamental premise that no uncertified PLC apparatus shall be entrusted with the safety of equipment or personnel. Thus although PLCs are used to control and monitor all manner of intricate equipment, simple hardware interlocks and relief devices … more
Date: May 5, 2000
Creator: Hance, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DE-FG02-96ER20226 FinalTechnicalReport

Description: In the future, environmental concerns will mandate that manufacturing processes shift towards the use of renewable resources and the minimization of wastes, especially hazardous wastes. One-carbon compounds are of interest as feedstocks for synthesis of chemicals and materials, because they represent a relatively inexpensive, abundant and renewable resource. In addition, the environmentally-benign characteristics of microbial processes make them of interest as part of a long-term waste-minimiza… more
Date: September 5, 2009
Creator: Lidstrom, M E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo

Description: This paper explores some of the system dynamics and control issues for a short-stroke rotary actuator that we designed and tested for a new fast tool servo referred to as the 10 kHz rotary fast tool servo. The use of a fast tool servo (FTS) with a diamond turning machine for producing non-axisymmetric or textured surfaces on a workpiece is well known. In a previous paper [1] the authors provide details on the mechanical design and trade-off issues that were considered during the design phase fo… more
Date: August 5, 2005
Creator: Montesanti, R C & Trumper, D L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Preliminary Issues Associated With the Next Generation Nuclear Plant Intermediate Heat Exchanger Design.

Description: The Next Generation Nuclear Plant (NGNP), which is an advanced high temperature gas reactor (HTGR) concept with emphasis on production of both electricity and hydrogen, involves helium as the coolant and a closed-cycle gas turbine for power generation with a core outlet/gas turbine inlet temperature of 900-1000 C. In the indirect cycle system, an intermediate heat exchanger is used to transfer the heat from primary helium from the core to the secondary fluid, which can be helium, nitrogen/heliu… more
Date: April 5, 2007
Creator: Natesan, K.; Moisseytsev, A.; Majumdar, S. & Shankar, P. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Avalanche transistor selection for long term stability in streak camera sweep and pulser applications

Description: We have identified the Motorola 2N4014 and 2N5551 and the Raytheon RS3944 as three transistor types that exhibit avalanche characteristics and have long term collector breakdown voltage stability superior to other transistors tested. Stability on all types has been improved by power burnin. An automatic avalanche transistor burnin tester has been constructed to allow power burnin of up to 1008 transistors at a time. The tester is controlled by an IBM Personal Computer (PC) and can be programmed… more
Date: September 5, 1990
Creator: Thomas, S.W.; Griffith, R.L. & Teruya, A.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design note about a 75 KVA quiet power distribution system

Description: This note describes a 75KVA quiet power distribution system for X 653 in neutrino Lab D. It is fed from the regular AC distribution which exists in the building and it has no standby power. Its purpose is to remove electrical disturbances which are present on the regular AC distribution.
Date: April 5, 1984
Creator: Visser, A. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Novel Technology for Fabricating Customizable VLSI Artificial Neural Network Chips

Description: This paper describes an implementation of hardware neural networks using highly linear thin-film resistor technology and an 8-bit binary weight circuit to produce customizable artificial neural network chips and systems. These neural networks are programmed using precision laser cutting and deposition. The fast turnaround of laser-based customization allows us to explore different neural network architectures and to rapidly program the synaptic weights. Our customizable chip allows us to expand… more
Date: February 5, 1992
Creator: Fu, Chi Yung; Law, Benjamin; Chapline, George & Swenson, Dick
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A New Technique for Troubleshooting Large Capacitive Energy Storage Banks

Description: The Power Conditioning System (PCS) of the National Ignition Facility (NIF) like many pulse power systems relies on large numbers of inductively isolated high voltage capacitors configured in parallel for energy storage. When an energy storage capacitor fails in such a capacitor bank, there is often little or no external indication showing which capacitor failed. Identifying the failed component can be a time consuming and potentially hazardous operation. Conventional methods using capacitance … more
Date: June 5, 2001
Creator: Fulkerson, S E & Hammon, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemical Detection Based on Adsorption-Induced and Photo-Induced Stresses in MEMS Devices

Description: Recently there has been an increasing demand to perform real-time in-situ chemical detection of hazardous materials, contraband chemicals, and explosive chemicals. Currently, real-time chemical detection requires rather large analytical instrumentation that are expensive and complicated to use. The advent of inexpensive mass produced MEMS (micro-electromechanical systems) devices opened-up new possibilities for chemical detection. For example, microcantilevers were found to respond to chemical … more
Date: April 5, 1999
Creator: Datskos, P. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High Peak Power Gain Switched Flared Waveguide Lasers

Description: We gain-switch flared waveguide lasers to obtain 14.5 W peak powers and 0.5 nJ pulse energies with laser structures compatible with the generation of diffraction-limited beams. The results are in excellent agreement with a microscopic laser model.
Date: August 5, 1999
Creator: Chow, W.W.; Indik, R.; Koch, S.W.; Mar, Alan, Vawter, G. Allen & Moloney, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of solid-state induction modulators for high PRF accelerators

Description: 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: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lifetime studies of Mo/Si and Mo/Be multilayer coatings for extreme ultraviolet lithography

Description: Extreme Ultraviolet Lithography (EUVL) is a candidate for future application by the semiconductor industry in the production of sub-100 nm feature sizes in integrated circuits. Using multilayer reflective coatings optimized at wavelengths ranging from 11 to 14 nm, EUVL represents a potential successor to currently existing optical lithography techniques. In order to assess lifetimes of the multilayer coatings under realistic conditions, a series of radiation stability tests has been performed. … more
Date: August 5, 1999
Creator: Bajt, S; Clift, W M; Folta, J A; Gullikson, E M; Klebanoff, L E; Kleineberg, U et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SMQIE: A charge integrator and encoder chip for the CDF Run II Shower Max Detector

Description: The Technical Design Report for the CDF II Detector calls for the development of an imbedded two-dimensional position sensitive detector sandwiched inside the electromagnetic calorimeter and placed at the shower maximum. The purpose of this detector is to aid in the identification of electrons and photons, to separate photons from {pi}{sup 0}s, and to help identify electromagnetic showers. This detector is called the Shower Max. In order to achieve CDF's goals for resolution, timing, power and … more
Date: November 5, 1999
Creator: al., J. Hoff et
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pixel multichip module design for a high energy physics experiment

Description: At Fermilab, a pixel detector multichip module is being developed for the BTeV experiment. The module is composed of three layers. The lowest layer is formed by the readout integrated circuits (ICs). The back of the ICs is in thermal contact with the supporting structure, while the top is flip-chip bump-bonded to the pixel sensor. A low mass flex-circuit interconnect is glued on the top of this assembly, and the readout IC pads are wire-bounded to the circuit. This paper presents recent results… more
Date: November 5, 2003
Creator: al., Guilherme Cardoso et
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solid-state modulators for RF and fast kickders

Description: As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher output voltage and power levels. An explanation of the basic… more
Date: May 5, 2005
Creator: Cook, E. G.; Akana, G.; Gower, E. J.; Hawkins, S. A.; Hickman, B. C.; Brooksby, C. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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