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in subjects: "Microwave 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

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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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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

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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

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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

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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

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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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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

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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

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

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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

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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

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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

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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

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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

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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

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Stability of klystron operation as a function of input parameters

Instabilities in the operation of a high-power multicavity klystron have been studied as a function of various input parameters. Among these, the focusing magnetic field, rf input power and tuning of the second harmonic cavity were observed to have a striking effect in deciding the regions of unstable operation. One region of instability could be identified with a value of magnetic field corresponding to cyclotron resonance, at the operating frequency. The magnetic field value in the region of … more

Date: March 1, 1984

Creator: Singh, A.; Konrad, G. T. & Griffin, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development of H/sup -/ sources at Brookhaven National Laboratory

Negative hydrogen ion sources have been developed at Brookhaven National Laboratory for several years, with the initial goal to design a source for accelerator applications and later on to design a large unit for applications in neutral beam injectors of magnetic fusion devices. Three types of sources were investigated, a hollow discharge duoplasmatron yielding H/sup -/currents up to 60 mA, a Penning source yielding H/sup -/ currents up to 440 mA, and a magnetron source yielding H/sup -/ curren… more

Date: January 1, 1977

Creator: Prelec, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Analytic solution for the problem of gridded gap-electron flow interaction

The present study is motivated by the modelling of high-power klystrons. The two basic components of a Klystron are the resonant cavities and the drift spaces. This paper addresses only the first of these two components. Modelling of the drift spaces is deferred to future work. The formulation is not restricted to Klystron modelling, but is applicable to any problem involving the interaction of an electron beam with a resonant cavity. While the theory of Klystrons has been worked out in detail … more

Date: January 1, 1984

Creator: Kheifets, S.; Yu, S. & Jaeger, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Operational experience with SLAC energy upgrade

To produce energies of over 50 GeV for SLC, all klystron stations on the accelerator are being upgraded to produce 250 MeV energy contribution per station. This involves installing new, higher power, longer pulse klystrons, upgrading klystron modulators to provide these higher voltage, longer klystron beam pulses, and a new interlock and protection system. A new VAX based diagnostic system including automated microwave measurements, klystron beam monitors, and modulator performance checks is be… more

Date: April 1, 1986

Creator: Allen, M. A.; Cassel, R. L.; Dean, N. R.; Konrad, G. T.; Koontz, R. F.; Schwarz, H. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent progress in relativistic klystron research

Experimental work is now under way by collaborators at LLNL, SLAC, and LBL to investigate relativistic klystrons as a possible rf power source for future high-gradient accelerators. We have learned how to overcome our previously reported problem of high-power rf pulse shortening and have achieved peak rf power levels of 290 MW. We have used the rf from a relativistic klystron to power a short, 11.4-GHz high-gradient accelerator. The measured momentum spectrum of the accelerated electron beam co… more

Date: August 1, 1989

Creator: Allen, M. A.; Callin, R. S.; Deruyter, H.; Eppley, K. R.; Fant, K. S.; Fowkes, W. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department