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Rf power sources for 1990 and beyond

Description: 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: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Subpicosecond high-brightness uv laser system

Description: A laser system that produces intense subpicosecond pulses of 248 nm light is under development. Ultrashort pulses are generated in the visible in a synchronously-pumped mode-locked dye oscillator, heterodyned into the uv by two KDP crystals, and amplified in a chain of KrF* amplifiers. Front end output of 5 ..mu..J is amplified to 20 mJ and focused to peak intensities of order 10/sup 17/ W cm/sup -2/. Additional amplification is expected to permit experiments at intensities >10/sup 20/ W cm/sup… more
Date: January 1, 1986
Creator: Gibson, R.B.
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Partner: UNT Libraries Government Documents Department
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Initial results of a high-power microwave sintering experiment at ORNL

Description: Experiments have recently begun at Oak Ridge National Laboratory to develop microwave sintering techniques suitable for large ceramic parts. Microwave sintering offers the advantages of faster heating rates, more uniform heating, and greater energy efficiency than conventional sintering techniques. We are using 28-GHz, 200-kW cw gyrotrons as the heating source. An untuned cavity is used as the applicator to eliminate geometry sensitivity in coupling efficiency.
Date: January 1, 1986
Creator: Kimrey, H.D.; White, T.L.; Bigelow, T.S. & Becher, P.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Amplifier-Discriminator-Multiplexor card

Description: The Amplifier-Discriminator-Multiplexor (ADM) card described was designed for the External Muon Identifier at the 15 ft Bubble Chamber. The general scheme of the data readout of the External Muon Identifier is based on the use of a master clock. The ADM card serves to amplify the signals from the proportional tubes, discriminate them, latch the signals in parallel into a shift register. The data are then shifted out serially to the Time Digitizing System, using the master clock. The shift regis… more
Date: February 1, 1986
Creator: Graupman, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New preamplifier for drift chambers

Description: A new preamplifier has been developed by T. Kondo and a monolithic version built by Fujitsu of Japan. The monolithic device, MB43468, is in a 14 pin small outline IC package and contains four amplifiers. The package is similar to the MB43458, which was built by Fujitsu for the Fermilab VTPC and covered in TM-1284. However, unlike the MB43458, the device is an inverting negative feedback amplifier, intended for positive outputs. This report documents the results of the tests performed on this de… more
Date: March 1, 1986
Creator: Zimmerman, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Silicon detector readout system using commercially available items

Description: The basic properties of silicon detectors are briefly noted, including bulk and electrical properties. Thermal and shot noise in front end amplifiers is discussed. The configuration of detectors and preamps is then briefly described. A detector test is described and results are given. (LEW)
Date: May 1, 1986
Creator: Green, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evolution of free-electron laser development

Description: Recent experimental demonstrations of free-electron laser oscillators and amplifiers have verified the feasibility of these broadly tunable photon sources. We review the current status and their continuing evolution toward ever higher output power and shorter wavelengths. 46 refs.
Date: January 1, 1986
Creator: Newman, B.E.
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Partner: UNT Libraries Government Documents Department
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New concepts in microwave sources for e/sup -/e/sup +/ supercolliders

Description: The realization of e/sup -/e/sup +/ supercolliders will require advances in tehnology including the development of x-band microwave amplifiers with pulse energy > 60 J. Candidate microwave amplifiers include klystrons, lasertrons, free electron lasers (FEL's), and gyrotrons; gyrotron amplifiers employing a multicavity gyroklystron configuration appear advantageous at lambda approx. = 3 cm. Measurements on a 50 kW, 1 ..mu..s gyroklystron show phase jitter < 0.75/sup 0/ indicating compatibility o… more
Date: January 1, 1986
Creator: Granatstein, V.L.; McAdoo, J.H.; Striffler, C.D.; Lawson, W.; Latham, P.E. & Reiser, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oscillating virtual cathode, large-orbit gyrotron and driver

Description: Studies using an oscillating virtual cathode (vircator) and a large-orbit gyrotron to generate microwave levels of several hundred megawatts are being conducted at the Los Alamos National Laboratory (LANL). A pulse level of approx.1 MV, with length approaching 1 ..mu..s at a repetition rate of a few hertz, is anticipated for extension of these studies from the present single-shot mode with 100-ns pulse width. The increased pulse width is needed to test longer pulse length microwave sources. Pul… more
Date: January 1, 1986
Creator: VanHaaften, F. W.; Hoeberling, R. F. & Fazio, M. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The analog processing system for the Liquid Argon Calorimeter for SLD at SLAC

Description: The analog processing system for the Liquid Argon Calorimeter for the SLD project at SLAC is described. Amplification, storage of the analog information, and multiplexing is realized on specially developed hybrids, which will be mounted directly on the detector. This leads to a substantial reduction of the cable plant. Test results for the amplifier and for the sampling and multiplexing hybrid (CDU hybrid) are presented. The latter hybird contains a custom monolithic device, the Calorimeter Dat… more
Date: September 1, 1986
Creator: Haller, G. M.; Nelson, D. & Freytag, D. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Generation of stable Ps, mJ pulses at high repetition rate for ultrafast diagnostic experiments: Final report

Description: Nd:Glass amplifiers have very good energy storage capabilities (5 J/cm/sup 2/), but, the energy extraction is extremely inefficient for short-pulse amplification. At relatively high peak intensities of approx. 10 GW/cm/sup 2/, nonlinear phase shifts occur, leading to beam wavefront distortion which can result in filamentation and irreversible damage. In order that the peak intensity in the amplifier remain below this damage level, a picosecond pulse can be amplified only to an energy density of… more
Date: October 1, 1986
Creator: Mourou, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design and operation of 140 GHz gyrotron oscillators for power levels up to 1 MW CW

Description: Varian has designed and tested 140 GHz gyrotron oscillators that have generated output powers of 100 kW CW and 200 kW for 1 ms pulses. Upcoming tubes will be designed to operate at power levels of 200 kW CW and ultimately up to 1 MW CW. The important design considerations which are addressed in the higher power tubes include the design of the electron gun, interaction circuit, and output window. These issues will be discussed and the results of the earlier 140 GHz gyrotron work at Varian will b… more
Date: December 1, 1986
Creator: Jory, H.; Bier, R.; Craig, L.J.; Felch, K.; Ives, L.; Lopez, N. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonant cavity operation of a virtual cathode oscillator

Description: Gigawatt level virtual cathode sources have been proposed for several applications. These include microwave weapons and drivers for high-energy particle accelerators. Both of these require a microwave source with very high power output that is controllable in frequency and phase. A conventional virtual cathode oscillator will not meet these requirements. The addition of a resonant cavity surrounding the oscillating virtual cathode either alone or pumped with a low-power injection signal, causin… more
Date: December 1, 1986
Creator: Fazio, M. V. & Hoeberling, R. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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