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Electron cyclotron resonance heating (ECRH) in the TMX-Upgrade tandem-mirror experiment

Description: Results are described of engineering tests of operation of two gyrotrons from one power supply, tests of waveguide components and antennae, antenna design, and the x-ray shielding concept. Finally, we describe considerations of interaction with other system components.
Date: October 1, 1981
Creator: Griffin, D.H.; Rubert, R.R.; Simonen, T.C.; Stallard, B.W. & Wieskamp, T.F.
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Partner: UNT Libraries Government Documents Department
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Requirements and new materials for fusion laser systems

Description: Higher focusable power in neodymium glass fusion lasers can be obtained through the use of new materials with lower nonlinear index (n/sub 2/) and better energy storage capabilities than the presently employed silicate glass. Silicate, phosphate, fluorophosphate, and beryllium fluoride glasses are discussed in terms of fusion laser requirements, particularly those for the proposed Nova laser. Examples of the variation in spectroscopic and optical properties obtainable with compositional changes… more
Date: October 1, 1977
Creator: Stokowski, S. E.; Weber, M. J.; Saroyan, R. A. & Hagen, W. F.
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Partner: UNT Libraries Government Documents Department
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Experimental system and component performance analysis

Description: A prototype dye laser flow loop was constructed to flow test large power amplifiers in Building 169. The flow loop is designed to operate at supply pressures up to 900 psig and flow rates up to 250 GPM. During the initial startup of the flow loop experimental measurements were made to evaluate component and system performance. Three candidate dye flow loop pumps and three different pulsation dampeners were tested.
Date: October 1, 1984
Creator: Peterman, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Second coordinate readout in drift chambers by charge division

Description: The drift time measurement and the charge division can be performed simultaneously on the same electrode (resistive anode) without affecting the accuracy of either measurement. It is shown that for the shortest measurement time there is an optimum value for the anode wire resistance. The signal requirement for a position uncertainty sigma less than or equal to 0.5% of the anode wire length is only 2.7 x 10/sup 6/ electron charges. The drift chamber can be operated in the linear mode and with ne… more
Date: October 1, 1977
Creator: Radeka, V. & Rehak, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Aurora status and plans

Description: Aurora is a short wavelength (248 nm) 10 to kJ KrF laser systems in the ICF program at Los Alamos National Laboratory. It is both an experiment in driver technology and a means for studying target performance using KrF laser light. Both features will be used to help evaluate the uv excimer laser as a viable fusion driver. The system has been designed to employ several electron-beam pumped amplifiers in series, with a final aperture of one meter square, to amplify 96 angularly mulitplexed 5 ns b… more
Date: October 1, 1987
Creator: Kristal, R.; Blair, L. S.; Burrows, M. D.; Cartwright, D. C.; Goldstone, P. D.; Greene, D. P. et al.
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Partner: UNT Libraries Government Documents Department
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Antares Phase two

Description: Definition of a large CO/sub 2/ laser system that would fit into the Antares facility was undertaken. Described here are the five amplifier cross sections that were studied, seven target systems, focusability and optic quality, and the crosstalk that occurs in multiplexed amplifiers. Eight amplifier system options are described: three are 400 kJ, five are 200 kJ, and one of each of these is multiplexed. A cost analysis is presented as an aid in comparing the options, and the current Antares des… more
Date: October 1, 1980
Creator: Leland, W. T.; Kircher, M.; Sklar, E.; Yavornik, E. & Zeigner, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gyrocon: a deflection-modulated, high-power microwave amplifier

Description: A large-signal, relativistic theory of the electron-field interaction in a new class of microwave amplifiers is presented and applied to the analysis of a high-power, 450-MHz amplifier for accelerator applications. The analysis indicates that electronic efficiencies in excess of 90 percent are obtainable and that overall efficiencies of 90 percent are possible. The amplifier is unique in several respects; the electron velocity is perpendicular to the circuit energy flow, the device uses a fast-… more
Date: October 1, 1977
Creator: Tallerico, P.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Readout and trigger electronics for the TPC vertex chamber

Description: The introduction of the vertex chamber required the addition of new front-end electronics and a new 1024-channel, high-accuracy TDC system. The preamplifier/discriminator should be capable of triggering on the first electrons and the time digitzer should preserve the measurement resolution. For the TDC's, in order to maintain compatibility with the existing TPC readout system, an upgrade of a previous inner drift chamber digitizer system has been chosen. Tests of the accuracy and stability of t… more
Date: October 1, 1987
Creator: Ronan, M. T.; Jared, R. C.; McGathen, T. K.; Eisner, A. M.; Broeder, W. J. & Godfrey, G. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and fabrication of advanced hybrid circuits for high energy physics

Description: Current design and fabrication techniques of hybrid devices are explained for the Drift Chamber and the Liquid Argon Calorimeter for the Stanford Linear Collider Large Detector (SLD) at SLAC. Methods of developing layouts, ranging from hand-cut templates to advanced designs utilizing CAD tools with special hybrid design software were applied. Physical and electrical design rules for good yield and performance are discussed. Fabrication and assembly of the SLD hybrids are described. 7 refs., 10 … more
Date: October 1, 1987
Creator: Haller, G.M.; Moss, J.; Freytag, D.R.; Nelson, D.; Yim, A. & Lo, C.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and construction of the front-end electronics data acquisition for the SLD CRID (Cherenkov Ring Imaging Detector)

Description: We describe the front-end electronics for the Cherenkov Ring Imaging Detector (CRID) of the SLD at the Stanford Linear Accelerator Center. The design philosophy and implementation are discussed with emphasis on the low-noise hybrid amplifiers, signal processing and data acquisition electronics. The system receives signals from a highly efficient single-photo electron detector. These signals are shaped and amplified before being stored in an analog memory and processed by a digitizing system. Th… more
Date: October 1, 1990
Creator: Hoeflich, J.; McShurley, D.; Marshall, D.; Oxoby, G.; Shapiro, S.; Stiles, P. (Stanford Linear Accelerator Center, Menlo Park, CA (USA)) et al.
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Partner: UNT Libraries Government Documents Department
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Fast timing methods for semiconductor detectors. Revision

Description: This tutorial paper discusses the basic parameters which determine the accuracy of timing measurements and their effect in a practical application, specifically timing with thin-surface barrier detectors. The discussion focusses on properties of the detector, low-noise amplifiers, trigger circuits and time converters. New material presented in this paper includes bipolar transistor input stages with noise performance superior to currently available FETs, noiseless input terminations in sub-nano… more
Date: October 1, 1984
Creator: Spieler, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cherenkov Ring Imaging Detector front-end electronics

Description: The SLD Cherenkov Ring Imaging Detector use a proportional wire detector for which a single channel hybrid has been developed. It consists of a preamplifier, gain selectable amplifier, load driver amplifier, power switching, and precision calibrator. For this hybrid, a bipolar, semicustom integrated circuit has been designed which includes video operational amplifiers for two of the gain stages. This approach allows maximization of the detector volume, allows DC coupling, and enables gain selec… more
Date: October 1, 1990
Creator: Antilogus, P.; Aston, D.; Bienz, T.; Bird, F.; Dasu, S.; Dunwoodie, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron cyclotron pulse gyroklstron power supply

Description: The system herein described represents utilization of technology developed at Universal Voltronics Corporation in accordance with General Atomic specifications to provide power for a gyrotron developed by Varian Inc. The current designs are derived from experience gained in design of similar systems and the requirements imposed by Varian to supply needs of gyrotron. The technical approach was carefully selected to insure high reliability, high performance, low maintenance time, and best cost tr… more
Date: October 1, 1979
Creator: Remsen, D.B. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of Low Noise Preamplifier for the Detection and Position Determination of Single Electrons in a Cerenkov Ring Imaging Detector by Charge Division

Description: A preamplifier having 500 electrons noise (rms) has been developed for the detection and location of single electrons in a CRID detector at the SLD. A single channel contains preamp, RC-CR shaper, gain adjustment, driver, and calibration circuitry. Noise and linearity measurements are presented.
Date: October 1, 1987
Creator: Spencer, E.; Coyle, P.; Williams, D.; Bienz, T.; Bird, F.; Gaillard, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Monolithic JFET preamplifier for ionization chamber calorimeter

Description: A monolithic charge sensitive preamplifier using exclusively n-channel diffused JFETs has been designed and is now being fabricated by INTERFET Corp. by means of a dielectrically isolated process which allows preserving as much as possible the technology upon which discrete JFETs are based. A first prototype built by means of junction isolated process has been delivered. The characteristics of monolithically integrated JFETs compare favorably with discrete devices. First results of tests of a p… more
Date: October 1, 1990
Creator: Radeka, V.; Rescia, S. (Brookhaven National Lab., Upton, NY (United States)); Manfredi, P.F. & Speziali, V. (Pavia Univ. (Italy). Dipt. di Elettronica)
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Partner: UNT Libraries Government Documents Department
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MARK II end cap calorimeter electronics

Description: An end cap calorimeter system has been added to the MARK II detector in preparation for its use at the SLAC Linear Collider. The calorimeter uses 8744 rectangular proportional counter tubes. This paper describes the design features of the data acquisition electronics that has been installed on the calorimeter. The design and use of computer-based test stands for the amplification and signal-shaping components is also covered. A portion of the complete system has been tested in a beam at SLAC. I… more
Date: October 1, 1985
Creator: Jared, R. C.; Haggerty, J. S.; Herrup, D. A.; Kirsten, F. A.; Lee, K. L.; Olson, S. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Transistor reset preamplifier for high-rate high-resolution spectroscopy

Description: Pulsed transistor reset of high resolution charge sensitive preamplifiers used in cooled semiconductor spectrometers can sometimes have an advantage over pulsed light reset systems. Several versions of transistor reset spectrometers using both silicon and germanium detectors have been built. This paper discusses the advantages of the transistor reset system and illustrates several configurations of the packages used for the FET and reset transistor. It also describes the preamplifer circuit and… more
Date: October 1, 1981
Creator: Landis, D. A.; Cork, C. P.; Madden, N. W. & Goulding, F. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Test stands for the Central Drift Chamber front end hybrid in the Stanford Linear Collider Detector

Description: The Central Drift Chamber (CDC) of the SLAC Linear Collider Detector (SLD) uses 1280 front end electronic hybrid modules. Each of these modules contains over 450 components and performs numerous functions. This paper describes the four test stands for production and detailed circuit characterizations of these hybrids. Descriptions and performance of some of the important functions of the test systems will be presented here.
Date: October 1, 1987
Creator: Lo, C.C. & Yim, A.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SLAC Mark II upgrade drift chamber front end electronics

Description: The SLAC Mark II detector is being improved by the addition of a new main drift chamber and associated electronics to prepare it for operations as the first detector at SLC. Presented here are the initial signal processing electronics, the preamplifiers, amplifiers and discriminators for the 5832 sense wires, which are located on the detector itself. The performance of the detector is established almost entirely by the drift chamber and these electronics.
Date: October 1, 1984
Creator: Briggs, D.; Burchat, P.; Dorfan, D.; Gioumousis, A.; Horelick, D.; Hutchinson, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Initial operation of a high-power whispering-gallery-mode gyrotron

Description: Varian has begun the development of a high-power gyrotron based on a whispering-gallery-mode interaction circuit. The first experimental tube has been designed to generate pulsed output powers up to 1 MW at a frequency of 140 GHz. The tube was also designed for CW operation at power levels of several hundred kilowatts. The overall design of the tube is discussed. Fabrication of the tube is nearing completion and initial tests on the tube will be carried out in the near future. 5 refs., 2 figs.
Date: October 1, 1987
Creator: Felch, K.; Ives, L.; Jongewaard, E.; Jory, H. & Spang, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The front-end analog and digital signal processing electronics for the drift chambers of the Stanford Large Detector

Description: The front-end signal processing electronics for the drift-chambers of the Stanford Large Detector (SLD) at the Stanford Linear Collider is described. The system is implemented with printed-circuit boards which are shaped for direct mounting on the detector. Typically, a motherboard comprises 64 channels of transimpedance amplification and analog waveform sampling, A/D conversion, and associated control and readout circuitry. The loaded motherboard thus forms a processor which records low-level … more
Date: October 1, 1990
Creator: Haller, G.M.; Freytag, D.R.; Fox, J.; Olsen, J.; Paffrath, L.; Yim, A. (Stanford Linear Accelerator Center, Menlo Park, CA (USA)) et al.
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Partner: UNT Libraries Government Documents Department
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Photoconductive switching for high power microwave generation

Description: Photoconductive switching is a technology that is being increasingly applied to generation of high power microwaves. Two primary semiconductors used for these devices are silicon and gallium arsenide. Diamond is a promising future candidate material. This paper discusses the important material parameters and switching modes, critical issues for microwave generation, and future directions for this high power, photoconductive switching technology.
Date: October 1, 1990
Creator: Pocha, M. D. & Hofer, W. W.
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Partner: UNT Libraries Government Documents Department
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High gain and high extraction efficiency from a free electron laser amplifier operating in the millimeter wave regime

Description: Experiments at the Electron Laser Facility have generated peak microwave power of 180 MW at 35 GHz. The facility is operated as a single pass amplifier. Gain in excess of 30 dB/m has been observed up to saturation of the amplifier. For the 3 MeV, 850 Amp electron beam, the radiation corresponds to 7% energy extraction from the electron beam. Beyond saturation, the electron beam output power exhibits oscillations corresponding to the synchrotron motion of the trapped electrons in the ponderomoti… more
Date: October 1, 1985
Creator: Orzechowski, T. J.; Anderson, B. R.; Fawley, W. M.; Prosnitz, D.; Scharlemann, E. T.; Yarema, S. M. et al.
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Partner: UNT Libraries Government Documents Department
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RF pulse compression development

Description: The body of this paper discusses the theory and some rules for designing a multistage Binary Energy Compressor (BEC) including its response to nonstandard phase coding, describes some proof-of-principle experiments with a couple of low power BECs, presents the design parameters for some sample linear collider rf systems that could possibly use a BEC to advantage and outlines in the conclusion some planned R and D efforts. 8 refs., 26 figs., 4 tabs.
Date: October 1, 1987
Creator: Farkas, Z. D. & Weaver, J. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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