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Experimental system and component performance analysis

Description: A prototype dye laser flow loop was constructed to flow test large power amplifiers in Building 169. The flow loop is designed to operate at supply pressures up to 900 psig and flow rates up to 250 GPM. During the initial startup of the flow loop experimental measurements were made to evaluate component and system performance. Three candidate dye flow loop pumps and three different pulsation dampeners were tested.
Date: October 1, 1984
Creator: Peterman, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Overmoded waveguide components for the ECH system on PDX

Description: Waveguide components designed specifically for transmitting power into PDX for electron cyclotron heating (ECH) at 60 GHz are described. These include mode converters from the circular electric TE01 mode to the polarized HE11 mode, compact corrugated waveguide bends with a hyperbolic secant curvature variation, compact corrugated waveguide diameter tapers with a parabolic profile, and a high voltage dc break incorporating a section of dielectric waveguide, all designed for low-loss HE11 propaga… more
Date: January 1, 1984
Creator: Doane, J.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced crystalline laser materials

Description: To guide the laser materials research and development effort, we have analyzed the scaling laws for zig-zag and flow-cooled disk amplifiers, defined materials figures of merit, and developed laser performance applications maps. Within this technical framework, we have embarked on an effort to synthesize, characterize, select, and develop new materials useful for a variety of robust laser applications.
Date: January 1, 1984
Creator: Krupke, W. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fast timing methods for semiconductor detectors. Revision

Description: This tutorial paper discusses the basic parameters which determine the accuracy of timing measurements and their effect in a practical application, specifically timing with thin-surface barrier detectors. The discussion focusses on properties of the detector, low-noise amplifiers, trigger circuits and time converters. New material presented in this paper includes bipolar transistor input stages with noise performance superior to currently available FETs, noiseless input terminations in sub-nano… more
Date: October 1, 1984
Creator: Spieler, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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60 GHz, 200 kW CW gyrotron with high output mode purity

Description: For the first time, a Varian 60 GHz gyrotron, designed specifically to generate microwaves in a single output mode, has been operated at power levels up to 200 kW CW. High output mode purity is required for the efficient utilization of gyrotrons as high power microwave sources for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Using mode-specific directional couplers, measurements of the output mode content indicated that greater than 95% of the microwave output was in … more
Date: January 1, 1984
Creator: Jory, H.; Felch, K.; Bier, R.; Fox, L.; Huey, H.; Ives, L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of gyrotron developments at Varian Associates

Description: The status of gyrotrons developed by Varian for fusion heating applications will be briefly reviewed. Development work started in 1976 with the goal of 200 kW CW at 28 GHz. A more recent program was to develop 200 kW CW at 60 GHz. Pulsed and CW tubes produced by these programs will be briefly described and the scaling of these designs to other frequencies including 53, 56 and 70 GHz will be discussed. A 35 GHz design will also be described. Future efforts for gyrotrons at 120 and 140 GHz will a… more
Date: January 1, 1984
Creator: Jory, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design considerations for a 100 kW c-w, 140 GHz gyrotron oscillator

Description: A gyrotron oscillator capable of generating 100 kW of c-w power is currently under development at Varian. The tube is being designed for operation in the TE/sup 0//sub 031/ cavity mode with the electron beam located at the second radial electric field maximum in the cavity. The electron beam will be produced by a magnetron injection gun and the 56 kG magnetic field required for 140 GHz operation will be provided by a superconducting magnet. Initial design calculations for the important elements… more
Date: January 1, 1984
Creator: Felch, K.; Bier, R.; Fox, L.; Huey, H.; Ives, L.; Jory, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SLAC Mark II upgrade drift chamber front end electronics

Description: The SLAC Mark II detector is being improved by the addition of a new main drift chamber and associated electronics to prepare it for operations as the first detector at SLC. Presented here are the initial signal processing electronics, the preamplifiers, amplifiers and discriminators for the 5832 sense wires, which are located on the detector itself. The performance of the detector is established almost entirely by the drift chamber and these electronics.
Date: October 1, 1984
Creator: Briggs, D.; Burchat, P.; Dorfan, D.; Gioumousis, A.; Horelick, D.; Hutchinson, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Operation of a quasioptical electron cyclotron maser

Description: The electron cyclotron maser or gyrotron concept has been developed to produce sources producing 200 kW at 28 GHz continuously, and higher power outputs and frequencies in pulsed mode. These sources have been useful in electron cyclotron resonance heating (ECRH) in magnetically confined fusion devices. However, higher frequencies and higher power levels will be required in reactor-grade fusion plasmas, with likely requirements of 1.0 MW or more per source at 140 GHz. Conventional gyrotrons foll… more
Date: December 1, 1984
Creator: Morse, E. C. & Pyle, R. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computations of VSWR and mode conversion for complex gyrotron window geometries

Description: A computational method is described for determining VSWR and mode conversion for complex gyrotron window geometries. Assuming symmetric TE/sub on/ modes propagating in a circular cross-section guide, containing the window, one can write the total solution to the wave equation as the sum of the incident wave plus a wave scattered from the dielectric window region. The equations can be reformulated in terms of the scattered wave, resulting in a Helmholtz wave equation with an inhomogeneous drivin… more
Date: January 1, 1984
Creator: Salop, A. & Caplan, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effect of resonant microwave power on a PIG ion source

Description: We have investigated the effect of applying microwave power at the electron cyclotron frequency on the characteristics of the ion beam extracted from a hot-cathode PIG ion source. No change was seen in the ion charge state distribution. A small but significant reduction in the beam noise level was seen, and it is possible that the technique may find application in situations where beam quiescence is important. 29 references, 2 figures.
Date: August 1, 1984
Creator: Brown, I.G.; Galvin, J.E.; Gavin, B.F. & MacGill, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New method of proportional counter feedback biasing for wide-range radiation dose-rate monitors

Description: A prototypic wide-range radiation dose-rate monitor for civil defense applications has been developed and tested. The specified dose-rate range (0 to 500 R/h) was displayed on a single readout scale by using feedback-controlled biasing of a proportional counter. This new method is based on controlling the avalanche multiplication factor (gas gain) of the counter by varying its bias voltage in response to its measured output current (i.e., detected dose rate). The counter output current varies b… more
Date: January 1, 1984
Creator: Kopp, M.K.; Valentine, K.H.; Guerrant, G.C. & Manning, F.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Major results of the electron cyclotron heating experiment in the PDX tokamak

Description: Electron Cyclotron Heating (ECH) experiments on PDX have been carried out with two 60 GHz pulsed gyrotrons each yielding up to approximately 100 kW. The ECH system used two waveguide runs each about 30 meters long. One run included 5 bends and the other, 7 bends. Predetermined waveguide modes were transmitted. The electron cyclotron waves were launched in narrow beams from both the high field and the low field sides of the plasma torus. The major new physics results are: (1) efficient central e… more
Date: July 1, 1984
Creator: Hsuan, H.; Bol, K.; Bowen, N.; Boyd, D.; Cavallo, A.; Dimits, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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100 MHz fiber optic single transient gamma ray detection system

Description: A fiber optic system has been developed to measure single transient gamma rays. The gamma ray signature is converted to light by the Cerenkov process in a 20 cm length of radiation resistant optical fiber. The signal is transmitted over 1 km of optical fiber and detected by state-of-the-art, 175 MHz analog receivers. The receivers are based on silicon PIN detectors with transimpedance hybrid amplifiers and two stages of power amplification. The dc coupled receivers have less than 2% distortion … more
Date: January 1, 1984
Creator: Ogle, J. W.; Smith, R. C.; Ward, M.; Ramsey, R. & Hollabaugh, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High power millimeter wave ECRH source needs for fusion program

Description: This document stems from the four-day Gyrotron Symposium held at the US Department of Energy (DOE) Headquarters on June 13-16, 1983, and serves as a position paper for the Office of Fusion Energy, DOE, on high-power millimeter wave source development for Electron Cyclotron Heating (ECH) of plasmas. It describes the fusion program needs for gyrotron as ECH sources, their current status, and desirable development strategies.
Date: June 1, 1984
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design, construction, and operational results of an 800-A, 10-kV hot deck amplifier

Description: This paper describes the electrical design, implementation, and operational results of a high fidelity (feedback regulated) 800 A, 10-kV hard tube, hot deck amplifier. The amplifier can produce any linear waveform to 800-A for 30 ms and beyond (depending on main energy storage). The present use is to drive the vertical field (VF) control windings on ZT-40M, a toroidal reversed field pinch plasma physics experiment. Although our application requires only 10 kV (8 MW) of switching, anode voltage … more
Date: June 1, 1984
Creator: Reass, W.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New preamplifier for particle detectors

Description: A new preamplifier for particle detectors has been designed and built for the Fermilab VTPC by Fujitsu of Japan. The device, designated MB43458, is a semi-custom monolithic assembled in a small, low mass package. The purpose of this report is to document the preliminary tests which have been done thus far. Tests are continuing to expand upon the results presented herein.
Date: November 1, 1984
Creator: Yarema, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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