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Amplified spontaneous emission and pulse train amplification in a KrF amplifier

Description: We present modeling status of pulse-train amplification experiments conducted at Sandia National Laboratory in Albuquerque (SNLA) with an e-beam pumped KrF laser amplifier. The laser geometry is such that the dominant amplified spontaneous emission (ASE) growth is along the propagation axis. Our numerical studies include the propagation of on axis co- and counter-propagating fields for both the pulse train and ASE simultaneously. The time-dependent gain, absorption, formation and quenching rate… more
Date: January 1, 1988
Creator: Ackerhalt, J. R.; Hanson, D. E.; Adams, R. G.; Raymond, T. D.; Reiser, C.; Rice, J. K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Eight channel - 16 bit, bidirectional analog to digital monitoring and control system

Description: The DIII-D tokamak facility is currently upgrading its electron cyclotron resonance heating (ECH) system. The new system is based on 110 GHz gyrotrons developed by Varian. As part of this upgrade, the superconducting magnet power supplies were required to be remotely controlled and monitored accurately. The 110 GHz gyrotron superconducting magnet has eight coils, that are energized by current regulating power supplies. An analog to digital (A/D) system was designed to allow remote coil current … more
Date: November 1, 1991
Creator: Allen, J. C.; Callis, R. W.; Cary, W. P.; Harris, T. E. & Nerem, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Eight channel - 16 bit, bidirectional analog to digital monitoring and control system

Description: The DIII-D tokamak facility is currently upgrading its electron cyclotron resonance heating (ECH) system. The new system is based on 110 GHz gyrotrons developed by Varian. As part of this upgrade, the superconducting magnet power supplies were required to be remotely controlled and monitored accurately. The 110 GHz gyrotron superconducting magnet has eight coils, that are energized by current regulating power supplies. An analog to digital (A/D) system was designed to allow remote coil current … more
Date: November 1, 1991
Creator: Allen, J. C.; Callis, R. W.; Cary, W. P.; Harris, T. E. & Nerem, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microwave energy storage in resonant cavities

Description: One method of generating short, high-power microwave pulses is to store rf energy in a resonant cavity over a relatively long fill time and extract is rapidly. A power gain roughly equal to the ratio of fill time to extraction time can be obtained. During the filling of a resonant cavity some of the energy is lost in heating the cavity walls, and some will generally be reflected at the input coupling of the cavity. In this paper we discuss the time dependence of the stored energy and related qu… more
Date: February 1, 1983
Creator: Alvarez, Raymond A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cherenkov Ring Imaging Detector front-end electronics

Description: The SLD Cherenkov Ring Imaging Detector use a proportional wire detector for which a single channel hybrid has been developed. It consists of a preamplifier, gain selectable amplifier, load driver amplifier, power switching, and precision calibrator. For this hybrid, a bipolar, semicustom integrated circuit has been designed which includes video operational amplifiers for two of the gain stages. This approach allows maximization of the detector volume, allows DC coupling, and enables gain selec… more
Date: October 1, 1990
Creator: Antilogus, P.; Aston, D.; Bienz, T.; Bird, F.; Dasu, S.; Dunwoodie, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications

Description: This progress report encompasses work on two separate projects, both related to developing sources for electron cyclotron resonance heating of magnetic fusion plasmas. The report is therefore divided into two parts as follows: Free electron laser with small period wigglers; and theory and modeling of high frequency, high power gryotron operation. Task A is experimental and eventually aims at developing continuously tunable, cw sources for ECRH with power per unit as high as 5 megawatts. Task B … more
Date: January 1, 1992
Creator: Antonsen, T. M. Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications

Description: This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ [approx lt] f [approx lt] 150 GHz and with relatively modest voltage, we have been investigating the use of small period ([lambda][sub [omega]] [approximately] 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high w… more
Date: February 1, 1993
Creator: Antonsen, T. M. Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications. Task A, Free electron lasers with small period wigglers; Task B, Theory and modeling of high frequency, high power gyrotron operation: Progress report, May 1, 1993--May 1, 1994

Description: This task involves the feasibility of high-power pulsed, high- efficiency, millimeter-wave free electron lasers (FEL) for ecr of thermonuclear plasmas. The research undertaken is to develop high average power FEL at voltage below IMV allowing for smaller and less costly power supplies. Linear amplification experiments employing a No. 56 period untapered wiggler have been conducted, and substantial small signal gain was observed at 95 GHz over a wide range of experimental conditions consistent w… more
Date: May 1, 1994
Creator: Antonsen, T. M., Jr.; Destler, W. W.; Granatstein, V. & Levush, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications. Progress report, July 15, 1992--July 14, 1993

Description: This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ {approx_lt} f {approx_lt} 150 GHz and with relatively modest voltage, we have been investigating the use of small period ({lambda}{sub {omega}} {approximately} 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high w… more
Date: February 1, 1993
Creator: Antonsen, T. M., Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Microwave generation for magnetic fusion energy applications. Progress report, September 15, 1991--July 15, 1992

Description: This progress report encompasses work on two separate projects, both related to developing sources for electron cyclotron resonance heating of magnetic fusion plasmas. The report is therefore divided into two parts as follows: Free electron laser with small period wigglers; and theory and modeling of high frequency, high power gryotron operation. Task A is experimental and eventually aims at developing continuously tunable, cw sources for ECRH with power per unit as high as 5 megawatts. Task B … more
Date: January 1, 1992
Creator: Antonsen, T. M., Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent operational performance of the CERN Omega Ring Imaging Cerenkov Detector

Description: We discuss the design and construction of the Time Projection chambers (TPCs) of the Omega Ring Imaging Cerenkov Detector (RICH). Details are given of the TPC high voltage system and its monitoring and control. In addition, the operation and monitoring of the readout is described together with results of tests on the performance of the front end amplifiers. The operation of the RICH TPCs and electronics during the first data run of WA69, in 1984, is discussed together with relevant results from… more
Date: October 1, 1985
Creator: Apsimon, R. J.; Flower, P. S.; Freeston, K. A.; Hallewell, G. D.; Morris, J. A. G.; Morris, J. V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development program for a 200 kW, CW, 110 GHz gyrotron. Quarterly report No. 1, June-September 1979

Description: The objective of this program is the design and development of a millimeter-wave device to produce 200 kW of continuous-wave power at 110 GHz. The device, which will be a gyrotron oscillator, will be compatible with power delivery to an electron-cyclotron plasma. Smooth control of rf power output over a 17 dB range is required, and the device should be capable of operation into a severe time-varying rf load mismatch. Progress toward this goal is described and specifications of the gyrotron are … more
Date: January 1, 1979
Creator: Arnold, K.W.; Tancredi, J.J.; Caplan, M.; Ha, K.W.; Birnbaum, D.N. & Weiss, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development program for a 200 kW, CW gyrotron. Quarterly report No. 2, October-December 1979

Description: The objective of this program was the design and development of a millimeter-wave device to produce 200 kW of continuous-wave power at 110 GHz. The device, which will be a gyrotron oscillator, will be compatible with power delivery to an electron-cyclotron plasma. Smooth control of rf power output over a 17 dB range is required, and the device should be capable of operation into a severe time-varying rf load mismatch. During the middle of this report period, the operating frequency was changed … more
Date: January 1, 1979
Creator: Arnold, K.W.; Tancredi, J.J.; Caplan, M.; Ha, K.W.; Birnbaum, D.N. & Weiss, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development program for a 200 kW, CW gyrotron. Quarterly report No. 3, January-March 1980

Description: The objective of this program is the design and development of a millimeter-wave device to produce 200 kW of continuous-wave power at 60 GHz. The device, which will be a gyrotron oscillator, will be compatible with power delivery to an electron-cyclotron plasma. Smooth control of rf power output over a 17 dB range is required, and the device should be capable of operation into a severe time-varying rf load mismatch. The duration of the program is 36 months, to encompass the building and test up… more
Date: January 1, 1980
Creator: Arnold, K.W.; Tancredi, J.J.; Caplan, M.; Ha, K.W.; Birnbaum, D.N. & Weiss, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Deployment, Commissioning and Operation of Plasma Electrode Pockels Cells in the National Ignition Facility

Description: Large aperture Plasma Electrode Pockels Cells (PEPCs) are an enabling technology in the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory. The Pockels cells allow the NIF laser to take advantage of multipass main amplifier architecture, thus reducing costs and physical size of the facility. Each Pockels cell comprises four 40-cm x 40-cm apertures arranged in a 4 x 1 array. The combination of the Pockels cell and a thin-film polarizer, also configured in a 4 x 1 arra… more
Date: December 1, 2003
Creator: Arnold, P. A.; Ollis, C. W.; Hinz, A.; Robb, C.; Primdahl, K. A.; Watson, J. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Brief Technology Survey of High-Power Microwave Sources

Description: This report provides a brief summary of the characteristics of contemporary high-power microwave sources. The focus is on their physical and operational characteristics and regions of application rather than their theory of operation. Magnetrons, linear beam tubes, split-cavity oscillators, virtual cathode oscillators, gyrotrons, free-electron lasers, and orbitron microwave masers are described. Power supply requirements and engineering issues of the application of HPM devices are addressed.
Date: April 1, 2001
Creator: BACON,LARRY D. & RINEHART,LARRY F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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GaAs-based JFET and PHEMT technologies for ultra-low-power microwave circuits operating at frequencies up to 2.4 GHz

Description: In this work the authors report results of narrowband amplifiers designed for milliwatt and submilliwatt power consumption using JFET and pseudomorphic high electron mobility transistors (PHEMT) GaAs-based technologies. Enhancement-mode JFETs were used to design both a hybrid amplifier with off-chip matching as well as a monolithic microwave integrated circuit (MMIC) with on-chip matching. The hybrid amplifier achieved 8--10 dB of gain at 2.4 GHz and 1 mW. The MMIC achieved 10 dB of gain at 2.4… more
Date: May 1, 1998
Creator: Baca, A. G.; Hietala, V. M.; Greenway, D.; Shul, R. J.; Hafich, M. J.; Zolper, J. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Complementary HFET technology for low-power mixed-mode applications

Description: Development of a complementary heterostructure field effect transistor (CHFET) technology for low-power, mixed-mode digital-microwave applications is presented. An earlier digital CHFET technology with independently optimizable transistors which operated with 319 ps loaded gate delays at 8.9 fJ is reviewed. Then work demonstrating the applicability of the digital nJFET device as a low-power microwave transistor in a hybrid microwave amplifier without any modification to the digital process is p… more
Date: June 1, 1996
Creator: Baca, A. G.; Sherwin, M. E.; Zolper, J. C.; Dubbert, D. F.; Hietala, V. M.; Shul, R. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Complementary HFET technology for wireless digital and microwave applications

Description: Development of a complementary heterostructure field effect transistor (CHFET) technology for low-power, mixed-mode digital-microwave applications is presented. Digital CHFET technology with independently optimizable transistors has been shown to operate with 319 ps loaded gate delays at 8.9 fJ. Power consumption is dominated by leakage currents of the p-channel FET, while performance is determined by the characteristics of 0.7 {mu}m gate length devices. As a microwave technology, the nJFET for… more
Date: September 1, 1996
Creator: Baca, A. G.; Zolper, J. C. & Dubbert, D. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Scintillation counter and wire chamber front end modules for high energy physics experiments

Description: This document describes two front-end modules developed for the proposed MIPP upgrade (P-960) experiment at Fermilab. The scintillation counter module was developed for the Plastic Ball detector time and charge measurements. The module has eight LEMO 00 input connectors terminated with 50 ohms and accepts negative photomultiplier signals in the range 0.25...1000 pC with the maximum input voltage of 4.0 V. Each input has a passive splitter with integration and differentiation times of {approx}20… more
Date: January 1, 2011
Creator: Baldin, Boris & DalMonte, Lou
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A versatile recording potentiometer

Description: ABS>A recording potentiometer was modified to provide a versatile instrument that can be applied to a variety of problems without time-consuming changes. Ranges may be selected in six spans, from 0.5 to 100 mv. No adjustments of amplifier gain are required when switching from one range to another. Zero suppression is continuously variable over a plus or minus 100 mv range by means of coarse and vernier controls. Cold junction compensation is provided for four standard thermocouples, and chart s… more
Date: February 1, 1960
Creator: Ballou, C. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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