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in subjects: "Electron Tubes"

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Generation of intense coherent soft x-ray with electron microbunches induced and frozen by lasers

We describe a new improved version of Transverse Optical Klystron Harmonic Generator that uses three lasers to replace the undulators in the modulator and radiator and freeze the electron microbunching. We show that intense soft x-rays can be generated.

Date: January 1, 1983

Creator: L.H., Yu.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Image Shutters: Gated Proximity-Focused Microchannel-Plate (MCP) Wafer Tubes vs Gated Silicon Intensified Target (SIT) Vidicons

The imaging characteristics of two fast image shutters used for recording the spatial and temporal evolution of transient optical events in the nanosecond range have been studied. Emphasis is on the comparative performances of each shutter type under similar conditions. Response data, including gating speed, gain, dynamic range, shuttering efficiency, and resolution for 18 and 25-mm-diam proximity-focused microchannel-plate (MCP) intensifiers are compared with similar data for a prototype elect… more

Date: January 1, 1982

Creator: Yates, G. J.; King, N. S. P.; Jaramillo, S. A.; Ogle, J. W.; Noel, B. W. & Thayer, N. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Aspects of the Physics, Chemistry, and Technology of High Intensity Heavy Ion Sources

Particular emphasis is placed on the technology of plasma discharge ion sources which utilize solid elemental or molecular compounds to produce vapor for the ionization process. A brief discussion is made of the elementary concepts underlying the formation and extraction of ion beams from plasma discharge sources. A limited review of low charge state positive ion sources suitable for accelerator use is also given.

Date: January 1, 1980

Creator: Alton, G. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Amorphous thin films for solar cell application. Quarterly report No. 2, July 1-September 30, 1979

Research on the fabrication of efficient amorphous silicon solar cells is reported. Work on the deposition of a-Si:H films by sputtering is described. Other areas under scrutiny include (a) degree and effect of oxygen and/or argon incorporation into the films, (b) dopant transfer from target to films, (c) dopant and alloy ion-implantation effects, and (d) film annealing behavior. Results to date are presented. (WHK)

Date: October 1, 1979

Creator: Jonath, A D; Crowley, J L; MacMillan, H F; Anderson, W W; Junga, F A; Kooi, C F et al.

Item Type: Report

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

open access

Discharge circuits and loads

This will be an overview in which some of the general properties of loads are examined: their interface with the energy storage and switching devices; general problems encountered with different types of loads; how load behavior and fault modes can impact on the design of a power conditioning system (PCS).

Date: October 15, 1980

Creator: Sarjeant, W. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of Passive Electronic Components for Instrumentation of Improved Geothermal Logging Tools and Components. Semiannual Progress Report. Report No. 1. [For Temperatures Up to 500/sup 0/C]

Research progress is reported on the development of passive components, resistors, capacitors, metallization, and passivation, that will withstand well logging temperatures to 500/sup 0/C and have extremely low temperature coefficients. The lower the temperature coefficients, the more exacting the instrumentation designs can be without elaborate compensation techniques. The method of fabricating the thin film components is that of chemical vapor deposition (CVD) which is a major deviation from … more

Date: April 20, 1977

Creator: Raymond, L. S.; Hamilton, D. J. & Kerwin, W. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Coherent very high power microwave source using a virtual cathode oscillator

An oscillating virtual cathode produced by a multikiloampere relativistic electron beam can generate microwave power at levels from several-hundred megawatts to one gigawatt. This type of source can operate from 500 MHz to 40 GHz. To become useful as an accelerator driver, it is essential that we control the frequency and phase of the microwave radiation. To accomplish this, it may be possible to use the resonant interaction between the oscillating virtual cathode and a microwave cavity that is… more

Date: January 1, 1986

Creator: Fazio, M. V. & Hoeberling, R. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fifty megawatt klystron for the Stanford Linear Collider

The proposed Stanford Linear Collider (SLC) has been designed to provide 50 on 50 GeV electron-positron collisions. The performance of the 240 klystrons driving the two-mile long linac must be upgraded to achieve at least 50 Megawatts of peak power output at a pulse of 5 ..mu..sec and a pulse repetition frequency of 180 pulses per second. The operating frequency of the upgraded linac will continue to be 2856 MHz. A klystron amplifier meeting these new requirements has been designed to operate a… more

Date: September 1, 1983

Creator: Lee, T. G.; Lebacqz, J. V. & Konrad, G. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Large source test stand for H/sup -/(D/sup -/) ion source

The Brookhaven National Laboratory Neutral Beam Group has constructed a large source test stand for testing of the various source modules under development. The first objective of the BNL program is to develop a source module capable of delivering 10A of H/sup -/(D/sup -/) at 25 kV operating in the steady state mode with satisfactory gas and power efficiency. The large source test stand contains gas supply and vacuum pumping systems, source cooling systems, magnet power supplies and magnet cool… more

Date: January 1, 1981

Creator: Larson, R. & McKenzie-Wilson, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Flow visualizations, velocity measurements, and surface convection measurements in simulated 20. 8-cm Nova box amplifier cavities

Reported are fluid mechanics experiments performed in models of the 20.8-cm Nova amplifier lamp and disk cavities. Lamp cavity nitrogen flows are shown, by both flow visualization and velocity measurements, to be acceptably uniform and parallel to the flashlamps. In contrast, the nitrogen flows in the disk cavity are shown to be disordered. Even though disk cavity flows are disordered, the simplest of three proposed nitrogen introduction systems for the disk cavity was found to be acceptable ba… more

Date: October 31, 1983

Creator: Julien, J.L. & Molishever, E.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Magnetron co-sputtering system for coating ICF targets

Fabrication of Inertial Confinement Fusion (ICF) targets requires deposition of various types of coatings on microspheres. The mechanical strength, and surface finish of the coatings are of concern in ICF experiments. The tensile strength of coatings can be controlled through grain refinement, selective doping and alloy formation. We have constructed a magnetron co-sputtering system to produce variable density profile coatings with high tensile strength on microspheres. The preliminary data on … more

Date: December 9, 1981

Creator: Hsieh, E. J.; Meyer, S. F.; Halsey, W. G.; Jameson, G. T. & Wittmayer, F. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A three-gap klystron output cavity at X-band

A high-power X-band klystron employing a double-gap output cavity has been operating at SLAC. Multi-gap output circuits have lower surface gradients at the interaction gaps than single-gap ones but are prone to self-oscillate due to negative loading and trapped higher-order modes. In the double-gap circuit design, considerable attention had been directed to deal with these stability problems. The performance of the present tube appears to be limited by gap breakdown and beam interception partic… more

Date: March 1, 1992

Creator: Ko, K.; Lee, T.G.; Tonegawa, S. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)) & Kroll, N. (Stanford Linear Accelerator Center, Menlo Park, CA (United States) California Univ., San Diego, La Jolla, CA (United States). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Toroidal helical quartz forming machine

The Scyllac fusion experimental machine used 10 cm diameter smooth bore discharge tubes formed into a simple toroidal shape prior to 1974. At about that time, it was discovered that a discharge tube was required to follow the convoluted shape of the load coil. A machine was designed and built to form a fused quartz tube with a toroidal shape. The machine will accommodate quartz tubes from 5 cm to 20 cm diameter forming it into a 4 m toroidal radius with a 1 to 5 cm helical displacement. The mac… more

Date: January 1, 1977

Creator: Hanks, K.W. & Cole, T.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Amorphous thin films for solar-cell applications. Quarterly report No. 1, 11 September-10 December 1979

Research progress on amorphous Si:H solar cells is described. Tasks include theoretical modeling, deposition and doping studies, experimental characterization of a-Si:H, formation of solar cell structures, and evaluation of solar cell parameters. A new method for determining the drift mobility of majority carriers in doped a-Si:H is discussed. Deposition and doping studies have been performed in an rf magnetron discharge system. Mass spectroscopy has been used to show that the major impurities … more

Date: December 1, 1979

Creator: Carlson, D. E.; Crandall, R. S.; Dresner, J.; Goldstein, B.; Hanak, J. J.; Moore, A. R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Enhancing the power output of the VA-955 UHF-TV klystron

The Varian VA-955 UHF-TV klystron is rated at 50 kW CW, and four of these klystrons were used to provide 200 kW of RF power for lower hybrid heating experiments on the ATC machine at 800 MHz. These proven, production-type tubes were wanted to generate more power for larger type machines, such as the PDX. Varian was asked whether the tubes were capable of higher-power operation in pulsed applications. They replied that they had no experimental data but felt that the tubes were capable of greatly… more

Date: January 1, 1977

Creator: Bowen, O.N. & Lawson, J.Q.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Count rate performance of a microchannel plate photomultiplier

The count rate dependent gain change of a microchannel plate photomultiplier has been measured. Gain changes of 60% have been observed for count rates in excess of 2 x 10/sup 5/ s/sup -1/. The microchannel plate photomultiplier was used as a multiplying element of a scintillation detector system using NaI(Tl) as the scintillator. Data are compared to a simplified model of this form of photomultiplier.

Date: January 1, 1981

Creator: Nieschmidt, E.B.; Lawrence, R.S.; Gentillon, C.D. & Vegors, S.H. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tests and development of duoplasmatron and mutli-aperture heavy ion sources for an RF linac

The goal of the program of ion source development for an rf linac has been to produce currents of up to 100 mA of the heavier gaseous ions such as argon and xenon, of good emittance (.02 ..pi.. cm mr, normalized) and charge state 1/sup +/. Existing facilities and hardware utilized included the 470 kV Bevatron injector, the 750 kV injector for the 50 MeV ESCAR linac, the 80 kV Bevatron test stand, a 20 kV LLL test stand and existing duoplasmatron and CTR sources. A summary of test results is sho… more

Date: November 1, 1977

Creator: Clark, D. J.; Richter, R. M.; Zajec, E.; Brokloff, R. & Osher, J. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

LIGHT METER FOR P-16 PHOSPHOR CATHODE-RAY TUBES.

No Description Available.

Date: January 1, 1968

Creator: Brown, W. K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Environmental influences contributing to window failure of the SLAC 50 MW klystron

The additional heating of the klystron window is due to the intense x-ray level, produced inside the klystron, illuminating the entrance of the output wave guide. Photo-electric effect, although of low efficiency, produces enough electrons at the right location and right phase to start multipactor, which progresses with increasing intensity towards the window. The intercepted charge and the concomitant x-radiation heat the window, but the heating is not the cause of the breakdown per se. The ac… more

Date: March 1, 1984

Creator: Krienen, F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Repetitive MEGAMP per microsecond di/dt pulsers for driving sub-ohm transmission line neutrino particle detectors

With the advent of low-cost honeycomb extrusions of polypropylene sheets, transmission line flash chambers have become highly attractive candidates for large particle detector arrays. This has brought about the need for repetitive pulse systems that must provide exceptionally high peak currents, low levels of spurious radiation, high reliability, and shot life in excess of 10/sup 7/. Each module of 10 flash chambers requires a peak current of 20 kA with a current di/dt greater than 1 MA/..mu..s… more

Date: January 1, 1980

Creator: Krausse, G.J.; Dalton, C.G. & Sarjeant, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Automatic network analyzer procedures for 5045 klystron cavities

This Note describes the results of using Automatic Network Analyzers in measuring SLAC 5045 klystron cavities. Two different analyzers were compared; the HP8753 and HP8510. Both analyzers have frequency synthesizer accuracy and stability to perform the measurement without the need for a frequency counter. The klystron has six cavities which can be put into three categories; input, gain and output. The input and output cavities require an external Q measurement (Qe) to determine coupling ({beta}… more

Date: July 1, 1991

Creator: Judkins, J.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Free-electron laser using rf-coupled accelerating and decelerating structures

A free electron laser and free electron laser amplifier using beam transport devices for guiding an electron beam to a wiggler of a free electron laser and returning the electron beam to decelerating cavities disposed adjacent to the accelerating cavities of the free electron laser. Rf energy is extracted from the electron beam after it emerges from the wiggler by means of the decelerating cavities which are closely coupled to the accelerating cavities, or by means of a second bore within a sin… more

Date: June 19, 1981

Creator: Brau, C.A.; Swenson, D.A. & Boyd, T.J. Jr.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

open access

Linear accelerators for TeV colliders

This paper summarizes four tutorial lectures on linear electron accelerators: Electron Linacs for TeV Colliders, Emittance and Damping Rings, Wake Fields: Basic Concepts, and Wake Field Effects in Linacs.

Date: May 1, 1985

Creator: Wilson, Perry B.

Item Type: Article

Partner: UNT Libraries Government Documents Department