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in subjects: "Electron Tubes"

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Cadmium sulfide/copper sulfide heterojunction cell research. Final report, February 26, 1979-July 15, 1980

Extensive modifications were made to the multi-source deposition apparatus. These include the installation of a larger vacuum chamber on the existing system. The new chamber provides improved inter-source shielding, an improved substrate mounting and heating system, and a vacuum interlock for introducing substrates. CdS resistivity control by both In doping and off-stoichiometric deposition has been investigated. Indium doping has been achieved both by diffusion from a pre-deposited In layer an… more

Date: June 30, 1980

Creator: Thornton, J. A. & Cornog, D. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Optimization of microchannel plate multipliers for tracking minimum-ionizing particles

The progress in development of special Microchannel Plates for particle tracking is reported. The requirements of (1) high spatial resolution; (2) high density of information; and (3) rate capability were found to be satisfied in a thick Microchannel Plate with a CsI coating operating in a focusing magnetic field. The measurements of the Microchannel Plate detection efficiency, gain and noise are presented for several detectors. The pictures of the passage and interaction of the high energy cha… more

Date: January 1, 1981

Creator: Oba, K.; Rehak, P. & Potter, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A TRANSISTORIZED ALPHA COUNTER FOR AN ALPHA GAUGE

A transistorized instrument prototype was designed and constructed to replace a vacuum-tube instrument in an alpha gauge, which measures the thickness density of gases. The instrument amplifies, shapes, discriminates, and counts alpha pulses from a Au-Si surface-barrier detector exposed to an alpha source in a gas-filled chamber. The circuit consists of a charge-sensitive preamplifier, a main amplifier with pulse clipping, a Schmitt trigger, a diode pump, and a count rate meter. Preliminary tes… more

Date: August 23, 1962

Creator: Kopp, M.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Accelerator technology program. Progress report, July-December 1980

The activities of Los Alamos National Laboratory's Accelerator Technology Division are discussed. This report covers the last six months of calendar 1980 and is organized around the Division's major projects. These projects reflect a wide variety of applications and sponsors. The major technological innovations promoted by the Pion Generator for Medical Irradiation (PIGMI) program have been developed; accelerator technologies relevant to the design of a medically practical PIGMI have been ident… more

Date: January 1, 1982

Creator: Knapp, E.A. & Jameson, R.A. (comp.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Configuring the SLC linac for injection into PEP

From time to time the normal SLC physics program is to be interrupted so that beam can be delivered to PEP. In order that the switch to PEP injection (and the switch back again) can be accomplished quickly and easily, the gun, the damping rings, the linac phase ramp, the energy profile of the linac klystrons for the scavenger bunch, and the entire positron production system are to be kept the same as in the SLC configuration. What mainly remains to be changed is the linac klystron profile for t… more

Date: December 15, 1989

Creator: Bane, K.L.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Some frontiers of accelerator physics

This paper discusses some concepts of future accelerators such as free electron lasers, two beam accelerator; and plasma-based adiabatic compressor. 12 refs., 10 figs., 5 tabs. (LSP)

Date: October 13, 1989

Creator: Sessler, A. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Time resolution performance studies of contemporary high speed photomultipliers

The time resolution capabilities of prototype microchannel plate and static crossed-field photomultipliers have been investigated. Measurements were made of electron transit time, rise time, time response, single photoelectron time spread and multiphotoelectron time spread for LEP HR350 proximity focused high gain curved microchannel plate and VPM-154A/1.6L static crossed-field photomultipliers. The experimental data have been compared with results obtained with conventionally designed RCS 8850… more

Date: October 5, 1977

Creator: Leskovar, B. & Lo, C.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

RESEARCH ON THE EFFECTS OF MAGNETIC FIELDS ON THERMIONIC POWER GENERATION. Progress Report No. 1

Research concerned with a theoretical and experimental study of magneto- thermionic power generation is reported. This concept promises a number of advantsges over conventional thermionic generators. Low pressure Cs diodes suffer from an undesirable size limitation, because selfinduced magnetic fields reduce current transmission and hence, efficiency. Although this effect does not arise in the small devices tested to date, it becomes important in building larger generators. Analysis indicates t… more

Date: October 1, 1961

Creator: Schock, A. & Kunen, A.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Rf power sources for 1990 and beyond

This paper will discuss the types of devices and system architectures that show promise in providing rf power sources for future space requirements. It will extrapolate these solutions to accelerators that are now being planned for construction and commissioning in the 1990s and will suggest technological advantages of using SDI-developed rf systems. Finally, the present state of the various SDI-sponsored high-powered rf-development programs will be reviewed.

Date: January 1, 1986

Creator: Reid, D.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Frontiers of particle beam physics

First, a review is given of various highly-developed techniques for particle handling which are, nevertheless, being vigorously advanced at the present time. These include soft superconductor radio frequency cavities, hard superconductor magnets, cooling rings for ions and anti-protons, and damping rings for electrons. Second, attention is focused upon novel devices for particle generation, acceleration, and focusing. These include relativistic klystrons and free electron laser power sources, b… more

Date: November 1, 1989

Creator: Sessler, Andrew M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Breakdown phenomena in high power klystrons

In the course of developing new high peak power klystrons at SLAC, high electric fields in several regions of these devices have become an important source of vacuum breakdown phenomena. In addition, a renewed interest in breakdown phenomena for nanosecond pulse, multi-megavolt per centimeter fields has been sparked by recent R and D work in the area of gigawatt RF sources. The most important regions of electrical breakdown are in the output cavity gap area, the RF ceramic windows, and the gun … more

Date: March 1, 1988

Creator: Vlieks, A. E.; Allen, M. A.; Callin, R. S.; Fowkes, W. R.; Hoyt, E. W.; Lebacqz, J. V. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Metallic coating of microspheres

Extremely smooth, uniform metal coatings of micrometer thicknesses on microscopic glass spheres (microspheres) are often needed as targets for inertial confinement fusion (ICF) experiments. The first part of this paper reviews those methods used successfully to provide metal coated microspheres for ICF targets, including magnetron sputtering, electro- and electroless plating, and chemical vapor pyrolysis. The second part of this paper discusses some of the critical aspects of magnetron sputter … more

Date: August 15, 1980

Creator: Meyer, S.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thyratron characteristics under high di/dt and high-repetition-rate operation

Power conditioning systems for high peak and average power, high repetition rate discharge excited lasers involve operation of modulator components in unconventional regimes. Reliable operation of switches and energy storage elements under high voltage and high di/dt conditions is a pacing item for laser development at the present time. To test and evaluate these components a Modulator Component Test Facility (MCTF) was constructed. The MCTF consists of a command charge system, energy storage c… more

Date: May 11, 1981

Creator: Ball, D.; Hill, J. & Kan, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thermionic integrated circuits: electronics for hostile environments

Thermionic integrated circuits combine vacuum tube technology with integrated circuit techniques to form integrated vacuum triode circuits. These circuits are capable of extended operation in both high-temperature and high-radiation environments.

Date: January 1, 1985

Creator: Lynn, D. K.; McCormick, J. B.; MacRoberts, M. D. J.; Wilde, D. K.; Dooley, G. R. & Brown, D. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

D-T neutron generator development for cancer therapy. 1980 annual progress report

This report summarizes the work completed during the first year of a two-year grant by NCI/HEW to investigate the feasibility of developing a D-T neutron generator for use in cancer therapy. Experiments have continued on the Target Test Facility (TTF) developed during a previous grant to investigate high-temperature metal hydrides for use as target materials. The high voltage reliability of the TTF has been improved so that 200 kV, 200 mA operation is now routine. In recent target tests, the D-… more

Date: May 1, 1980

Creator: Bacon, F.M.; Walko, R.J.; Bickes, R.W. Jr.; Cowgill, D.F.; Riedel, A.A. & O'Hagan, J.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Positron injection linac system for the Argonne Light Source

The Argonne 6 GeV Light Source will use positrons rather than electrons in order to avoid ion trapping of the residual gas. One of the primary requirements of the linac system is the capability to deliver relatively intense short bunches of positrons in the stationary buckets of the booster synchrotron without utilizing a positron accumulator ring. A linac system for accomplishing this task is described. It consists of a 200-MeV, high-current, electron linac and a 450-MeV positron linear accele… more

Date: January 1, 1986

Creator: Mavrogenes, G.; Cho, Y. & Khoe, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Specific heat loading in Nd:glass lasers

The specific thermal load parameter, chi, for xenon flashlamp-pumped Nd:glass gain media is written as a function of neodymium concentration, pump pulse duration, and energy extraction efficiency. The currently available data on radiative and nonradiative decay probabilities of several commercial Nd:glasses are used to calculate and graph specific thermal load parameter values. By factoring these results into performance scaling relationships for zig-zag and disk lasers, specific Nd:glasses can… more

Date: August 7, 1985

Creator: Krupke, W. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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DOE/JPL advanced thermionic technology program. Progress report No. 42

Progress is reported on the following tasks: (I) surface and plasma investigations, (II) low-temperature converter development, (III) enhanced mode converter experiments, (IV) component hardware development, (V) thermionic power module system studies, (VI) thermionic array module development, (VII) high-temperature converter evaluation, (VIII) advanced converter studies, (IX) postoperational diagnostics, (X) cylindrical converter component development, and (XI) correlation of design interfaces.… more

Date: January 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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H sup minus ion sources

A review is given of H{sup {minus}} ion sources, with the emphasis on sources of use for accelerator applications. A brief description is given of magnetron, multicusp/converter, Penning and volume H{sup {minus}} ion sources. Operating parameters for examples of the various type sources are presented, and then some comparisons among the sources are made. 37 refs., 1 fig., 3 tabs.

Date: January 1, 1991

Creator: Alessi, J.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Beam dynamics and rf evolution in a multistage klystron-like free- electron laser

Current understandings of beam dynamics and RF evolution in a klystron-like free-electron laser are present. Phase sensitiveness to injection jitters estimated by existing two theories is discussed. BBU suppression due to linear detuning is proposed as an alternative of ever proposed techniques. 13 refs., 2 figs., 1 tab.

Date: January 1, 1991

Creator: Ohnuma, S. (Houston Univ., TX (United States). Inst. for Beam Particle Dynamics) & Takayama, K. (Houston Univ., TX (United States). Inst. for Beam Particle Dynamics Texas Accelerator Center, The Woodlands, TX (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ceramic vacuum tubes for geothermal well logging

Useful design data acquired in the evaluation of ceramic vacuum tubes for the development of a 500/sup 0/C instrumentation amplifier are presented. The general requirements for ceramic vacuum tubes are discussed for application to the development of high temperature well logs. Commercially available tubes are described and future contract activities that specifically relate to ceramic vacuum tubes are detailed. Supplemental data are presented in the appendix.

Date: January 1, 1977

Creator: Kelly, R.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Overview of pulsers for nanosecond gating of image-shutter tubes

The capability of generating a useful optical shutter of a few nanoseconds or less utilizing gated proximity-focussed microchannel-plate (MCP) wafer tubes or silicon intensified target (SIT) vidicon tubes depends strongly on the driving electrical pulse. This paper will provide a summary of some of the electrical gate pulsers utilized in studying both proximity-focussed MCP imaging intensifiers and gated SIT FPS vidicon tubes. (WHK)

Date: January 1, 1982

Creator: Yates, G.J.; Ogle, J.W.; King, N.S.P. & Aeby, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operational experience with the BNL magnetron H/sup -/ source

A magnetron H/sup -/ source with a grooved cathode has been in operation at the BNL Linac for over 18 months. The source has run at 5 pps with a 600 ..mu..sec pulse width for periods as long as 5 months. Its development and performance will be discussed.

Date: January 1, 1983

Creator: Witkover, R.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Kinetics of coal pyrolysis and devolatilization

An experimentally based, conceptual model of the devolatilization of a HV bituminous coal is outlined in this report. This model contends that the relative dominance of a process type-chemical kinetic, heat transport, mass transport -- varies with the extent of reaction for a given set of heating conditions and coal type and with experimental conditions for a given coal type and extent of reaction. The rate of devolatilization mass loss process is dominated initially by heat transfer processes,… more

Date: January 1, 1987

Item Type: Report

Partner: UNT Libraries Government Documents Department