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in subjects: "Pulse Circuits"

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Issues for trigger processing at high luminosity colliders

A number of issues for the design of trigger processors at future high-luminosity, high-energy colliders such as the Superconducting Super Collider and the Large Hadron Collider are discussed.

Date: November 1, 1989

Creator: Lankford, A.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced accelerator research at Argonne

A facility with which to experimentally measure methods of advanced acceleration is at the point of completion at Argonne National Laboratory. The new facility consists a system which produces pulse ''doublets'' of energetic electrons, pulse shaping hardware, a space for experimental apparatus, and a high resolution spectrometer. The leading 21 MeV pulse in a doublet can contain up to 15 nano-coulombs of charge and can be adjusted to be from 6 to over 100 pic-seconds in length. The trailing dou… more

Date: January 1, 1986

Creator: Konecny, R.; MacLachlan, J.; Norem, J.; Ruggiero, A.; Schoessow, P. & Simpson, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Structural analysis of the central Columbia Plateau utilizing radar, digital topography, and magnetic data bases

Interest in the Hanford site (Washington) as a nuclear production, power, and waste disposal site has led to generation of a vast quantity of geophysical and remote sensing data sets of the central Columbia Plateau. To data, these various studies, including at least 13 independent magnetic linear and image lineament studies, have not been adequately correlated. Therefore, these studies provide a unique opportunity to compare and contrast the viability of the different geophysical and remote sen… more

Date: August 1, 1991

Creator: Thiessen, R. L.; Eliason, J. R.; Johnson, L. K.; Brougher, C. W. (Washington State Univ., Pullman, WA (United States). Dept. of Geology); Foley, M. G. & Beaver, D. E. (Pacific Northwest Lab., Richland, WA (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Small Angle Physics at CDF: A Progress Report

In 1989 CDF collected data in special high beta runs with a trigger selecting elastic and inelastic events in order to measure the total cross section ({sigma}{sub tot}) and the differential elastic cross section (d{sigma}{sub el}/dt). Data were taken at cms energies of 300, 540, 1000 and 1800 GeV. A double arm magnetic spectrometer located along the beam pipe tags the particles scattered at very small angles and tracking detectors surrounding the interaction point reveal particles produced at … more

Date: December 16, 1989

Creator: Paoletti, Riccardo

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Charged particle detector system for ISABELLE spectrometers

A detector system combining the good time resolution and low dead time of PWC's and the good space resolution of drift chambers is proposed for use in ISABELLE spectrometers. Central to this detector is the development of two integrated electronic circuit systems. The detectors are described with special emphasis on the electronic systems. The detector system proposed will be capable of handling particle flux rates typical of conventional PWC's yet providing a spacial resolution of 100 ..mu..m.… more

Date: January 1, 1977

Creator: Platner, E.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The digital data acquisition chain and the cosmic ray trigger system for the SLD Warm Iron Calorimeter

The entire data-acquisition chain, from the custom-made front-end electronics to the Fastbus readout and data-reduction module, for the digital readout of the SLD limited streamer tube Warm Iron Calorimeter and Muon Identifier is described. Also described is a Fastbus Cosmic Logic Unit being developed to achieve the capability of reading cosmic ray events, also during the inter-crossing time, for apparatus monitoring and calibration purposes. 9 refs., 9 figs.

Date: August 1, 1989

Creator: Benvenuti, A.; Piemontese, L.; Calcaterra, A.; De Sangro, R.; De Simone, P.; Burrows, P. N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fast-timing methods for semiconductor detectors

The basic parameters are discussed 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-nanosecond preamplif… more

Date: March 1, 1982

Creator: Spieler, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pulsed power supplies for the Fermilab 1 TeV switchyard

An upgraded system of pulseed switching magnets has been implemented in the Fermilab Switchyard to accommodate proton energies up to 1 TeV. These devices are required for switching the ''slow'' and ''fast'' extracted beams into their respective beam lines. ''Slow'' beam passes undeflected through the magnet in the off condition. During a puls ''slow'' is disabled and ''fast'', which is of approx.1 ms duration, is deflected. The requirement then is for a ''flat-top'' current pulse of minimum ris… more

Date: June 1, 1985

Creator: Bartelson, L. & Walton, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-voltage coaxial switch

A coaxial high voltage, high current switch having a solid cylindrical cold cathode coaxially surrounded by a thin hollow cylindrical inner electrode and a larger hollow cylindrical outer electrode is described. A high voltage trigger between the cathode and the inner electrode causes electrons to be emitted from the cathode and flow to the inner electrode preferably through a vacuum. Some of the electrons penetrate the inner electrode and cause a volumetric discharge in the gas (which may be m… more

Date: June 3, 1981

Creator: Rink, J. P.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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Surface Underground Coincidences at the Soudan Mine

A 37 m{sup 2} surface array which has been operating in coincidence with the Soudan 1 underground experiment is described. A comparison is made between measured and expected underground-surface coincident events. The surface array is used to tag'' the energy of the cosmic ray primary. Distributions of event rates and multiple muon rates as a function of energy are shown. Expected rates and plans for an enhanced array and for coincidences with Soudan 2 are also discussed. 1 ref., 6 figs.

Date: January 1, 1989

Creator: DasGupta, U.; Ambats, I.; Ayres, D.; Alner, G. J.; Balka, L.; Barr, G. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development and evaluation of systems for controlling parallel high di/dt thyratrons

Increasing numbers of high power, high repetition rate applications dictate the use or thyratrons in multiple of hard parallel configurations to achieve the required rate of current rise, di/dt. This in turn demands the development of systems to control parallel thyratron commutation with nanosecond accuracy. Such systems must be capable of real-time, fully-automated control in multi-kilohertz applications while still remaining cost effective. This paper describes the evolution of such a contro… more

Date: January 1, 1982

Creator: A., Litton. & McDuff, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dynamic positron emission tomography in man using small bismuth germanate crystals

Primary considerations for the design of positron emission tomographs for medical studies in humans are the need for high imaging sensitivity, whole organ coverage, good spatial resolution, high maximum data rates, adequate spatial sampling with minimum mechanical motion, shielding against out of plane activity, pulse height discrimination against scattered photons, and timing discrimination against accidental coincidences. We discuss the choice of detectors, sampling motion, shielding, and ele… more

Date: April 1, 1982

Creator: Derenzo, S.E.; Budinger, T.F.; Huesman, R.H. & Cahoon, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SSC physics signatures and trigger requirements

Strategies are considered for triggering on new physics processes on the environment of the SSC, where interaction rates will be very high and most new physics processes quite rare. The quantities available for use in the trigger at various levels are related to the signatures of possible new physics. Two examples were investigated in some detail using the ISAJET Monte Carlo program: Higgs decays to W pairs and a missing energy trigger applied to gluino pair production. In both of the examples … more

Date: January 1, 1985

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Participation in high energy physics, Task D

This report discusses the following topics: Communication and Advancement of High Energy Physics; B-Quarks; Secondary Vertex Trigger; and Science Education.

Date: April 1, 1992

Creator: Lederman, L.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Studies of. mu. prime s underground with the Soudan 2 Tracker

During the period July 1987 through March 1988, a section of the Soudan 2 active shield known as the Tracker' recorded {approximately}250,000 muon tracks. The detector is located in the Tower-Soudan State Park in Soudan, Minnesota USA at a depth of 2090 meters-water equivalent. We have analysed the data collected and searched for time-dependent astronomical sources. Distributions in azimuthal and zenith angles as well as declination and right ascension are shown. 1 ref., 7 figs., 1 tab.

Date: August 23, 1989

Creator: Kochocki, J.; Benjamin, D.; Ewen, B.; Kafka, T.; Mann, A.; McMaster, L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Indiana University High Energy Physics Group, Task E

This progress report for Task E of the Indiana University High Energy Physics Group covers the period June 1, 1990 to April 15, 1991. All my research effort was devoted to the Large Volume Detector (LVD) at the Gran Sasso Laboratory in Italy. The first of five towers'' of LVD is currently under construction. My primary effort during this time has been to bring to fruition the cabling plans developed by me the previous year. Other activities have included consultations on the design of the track… more

Date: January 1, 1991

Creator: Alyea, E.D. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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X-ray triggered switching in SF/sub 6/ insulated spark gaps

Several methods are being investigated for triggering low-jitter pressurized, SF/sub 6/-insulated spark gaps operating at 3 MV with the capability of switching hundreds of kiloamperes. One method, which is located external to the main current carrying plasma channel, uses pulsed x-rays to generate ionization within the working gas volume to initiate low jitter gas breakdown. In this paper, a model of gas breakdown with x-ray ionization is developed and results of two series of experiments are d… more

Date: January 1, 1980

Creator: Neau, E.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Monopole search using an accelerator detector

A neutrino detector at the Brookhaven AGS has been used to investigate the feasibility of using an already constructed apparatus for GUT monopole searches. A flux limit (90%CL) of 5.2 x 10/sup -12/ cm/sup -2/ sec/sup -1/ str/sup -1/ was found. The limitations of such an approach are discussed.

Date: December 20, 1983

Creator: Ahrenes, L.A.; Aronson, S.H.; Connolly, P.L.; Erickson, T.E.; Gibbard, B.G.; Montag, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Soudan 2 nucleon decay experiment

The Soudan 2 nucleon decay experiment consists of a 1.1 Kton fine grained iron tracking calorimeter. It has a very isotropic detection structure which along with its flexible trigger will allow detection of multiparticle and neutrino proton decay modes. The detector has now entered its construction stage.

Date: January 1, 1986

Creator: Thron, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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First events and prospects at the Fermilab collider

A brief description of the Collider Detector at Fermilab (CDF) is given including the detector components and the data acquisition system. The first test run, the first events, and the performance of the detector are discussed. Finally the prospects for future running are reviewed.

Date: March 1, 1986

Creator: Binkley, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design of a fast-rise slow-fall magnet modulator

Brookhaven National Laboratory is now in the process of expanding the capability of the AGS to include the acceleration of polarized protons. One of the requirements to accomplish this is to pulse twelve quadrupole magnets to rapidly cross depolarizing resonances. Having crossed the resonance, the field in the magnet must be maintained so as not to re-cross the resonance. The problem is addressed with two mirror image circuits, one to produce positive pulses, and the other negative. Each of the… more

Date: January 1, 1982

Creator: Lambiase, R.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of the resistive phase in high power gas switching. Research and development report

A theoretical study was made of the resistive phase in high pressure gas switching with the regime of interest being (10 to 50) kV from (1J, 10ns, 100KHz) to (100J, 10..mu..s, 1KHz). The resistive phase was examined as a function of applied field, gap spacing, inductance, gas type and pressure, and electrode material. The initiating and quenching phases as regards system performance (e.g., the jitter problem) were examined. The cooling and electrode debris removal effects of the vortex gas flow… more

Date: January 1, 1977

Creator: O'Rourke, R.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Performance of a new monolithic eight channel charge sensitive preamplifier-shaper

A monolithic eight channel CMOS time-invariant preamplifier/shaper has been designed and built by Chuck Britton of ORNL in collaboration with Ray Yarema and Tom Zimmerman of Fermilab. Each of the eight channels incorporates a charge sensitive preamplifier and two shaping stages. The resultant weighting function is similar to CR-RC{sup 3}. The peaking time is approximately 200 ns, and the charge gain approximately in the range of 50--70 mv/fc. The layout was done on a Tinychip pad frame and the … more

Date: August 1, 1991

Creator: Zimmerman, T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Power-conditioning system for the Advanced Test Accelerator

The Advanced Test Accelerator (ATA) is a pulsed, linear induction, electron accelerator currently under construction and nearing completion at Lawrence Livermore National Laboratory's Site 300 near Livermore, California. The ATA is a 50 MeV, 10 kA machine capable of generating electron beam pulses at a 1 kHz rate in a 10 pulse burst, 5 pps average, with a pulse width of 70 ns FWHM. Ten 18 kV power supplies are used to charge 25 capacitor banks with a total energy storage of 8 megajoules. Energy… more

Date: June 1, 1982

Creator: Newton, M. A.; Smith, M. E.; Birx, D. L.; Branum, D. R.; Cook, E. G.; Copp, R. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department