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Plasma Heating by Transit-Time Magnetic Pumping in Single-Transit Systems

Description: Report discussing the heating of a plasma which passes through a series of magnetic pumping cells by applying the second-order theory of transit-time heating developed by Berger and Newcomb. From abstract: "Transit-time magnetic pumping in single-transit systems seems to be a feasible method of increasing plasma energy by amounts of the order of a factor of 10."
Date: September 1956
Creator: Hall, Laurence S.; Gardner, Andrew L. & Edwards, Donald A.
Partner: UNT Libraries Government Documents Department
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Development of a 2 MW CW Waterload for Electron Cyclotron Heating Systems

Description: Calabazas Creek Research, Inc. developed a load capable of continuously dissipating 2 MW of RF power from gyrotrons. The input uses HE11 corrugated waveguide and a rotating launcher to uniformly disperse the power over the lossy surfaces in the load. This builds on experience with a previous load designed to dissipate 1 MW of continuous RF power. The 2 MW load uses more advanced RF dispersion to double the capability in the same size device as the 1 MW load. The new load reduces reflected power… more
Date: November 9, 2012
Creator: R. Lawrence,Ives; Mizuhara, Maxwell; Collins, George; Neilson, Jeffrey & Borchard, Philipp
Partner: UNT Libraries Government Documents Department
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Power and phase monitoring system for the lower hybrid phased array heating system on ATC machine

Description: A four waveguide phased array slow wave structure has been constructed to couple microwave energy into plasma in the ATC Tokamac at Princeton. Theory has indicated that the coupling of power into the plasma column is a strong function of the imposed fourier spectrum at the antenna aperture. To optimize heating, and to verify theoretical results, a precision amplitude and phase monitoring system has been designed and constructed. The system data output is routed to an IBM 1800 computer where the… more
Date: January 1, 1975
Creator: Reed, B.W.
Partner: UNT Libraries Government Documents Department
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200 kW, 800 MHz transmitter system for lower hybrid heating

Description: This paper describes a new rf heating system which has just been completed and is now operational on the ATC machine. The system utilizes four UHF TV klystrons to generate at least 200 kW of power at a frequency of 800 MHz. Pulse widths can be varied from 20 $mu$sec up to 20 msec. A radar type floating deck modulator along with photo-optical transmitting and receiving devices have been incorporated into the system to provide the pulse fidelity and versatility which characterizes this equipment.… more
Date: January 1, 1975
Creator: Deitz, A.
Partner: UNT Libraries Government Documents Department
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Radio frequency plasma heating in large tokamak systems near the lower hybrid resonance

Description: The frequency range, power, efficiency, and pulse length of a high power rf system are discussed as they might be applied to the TFTR Tokamak facility as well as on a full scale reactor. Comparisons are made of the size, power output, and costs to obtain microwave power sufficient to satisfy the physics requirements. A new microwave feed concept is discussed which will improve the coupling of the microwave energy into the plasma. The unique advantages of waveguide feed systems is apparent when … more
Date: January 1, 1975
Creator: Deitz, A. & Hooke, W.M.
Partner: UNT Libraries Government Documents Department
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Collisionless electron heating in inductively coupled discharges

Description: A kinetic theory of collisionless electron heating is developed for inductively coupled discharges with a finite height L. The novel effect associated with the finite-length system is the resonance between the bounce motion of the electrons and the wave frequency, leading to enhanced heating. The theory is in agreement with results of particle simulations.
Date: July 1, 1996
Creator: Shaing, K. C. & Aydemir, A. Y.
Partner: UNT Libraries Government Documents Department
open access

Cold Electronstatic Ion Cyclotron Waves for Preionization and IBW Launching in LHD

Description: A folded waveguide with E|| polarization is being installed on LHD device. The main purpose of the folded waveguide is to pre-ionize and create good target plasmas. The present manuscript proposes a launching of IBW via CESICW (Cold Electrostatic Ion Cyclotron Wave) for heating the core of LHD with the folded waveguide. The core heating can be accomplished by adding a minority hydrogen ion species in a helium majority plasma facilitating the mode-transformation of CESICW into IBW at the ion-ion… more
Date: April 1, 1999
Creator: Ono, Masayuki
Partner: UNT Libraries Government Documents Department
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Reactive gas plasma specimen processing for use in microanalysis and imaging in analytical electron microscopy

Description: It has long been the bane of analytical electron microscopy (AEM) that the use of focused probes during microanalysis of specimens increases the local rate of hydrocarbon contamination. This is most succinctly observed by the formation of contamination deposits during focused probe work typical of AEM studies. While serving to indicate the location of the electron probe, the contamination obliterates the area of the specimen being analyzed and adversely affects all quantitative microanalysis me… more
Date: January 1997
Creator: Zaluzec, N. J.; Kestel, B. J. & Henriks, D.
Partner: UNT Libraries Government Documents Department
open access

Magnetic confinement experiment. I: Tokamaks

Description: Reports were presented at this conference of important advances in all the key areas of experimental tokamak physics: Core Plasma Physics, Divertor and Edge Physics, Heating and Current Drive, and Tokamak Concept Optimization. In the area of Core Plasma Physics, the biggest news was certainly the production of 9.2 MW of fusion power in the Tokamak Fusion Test Reactor, and the observation of unexpectedly favorable performance in DT plasmas. There were also very important advances in the performa… more
Date: August 1, 1995
Creator: Goldston, R.J.
Partner: UNT Libraries Government Documents Department
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MHD stability studies in reversed shear plasmas in TFTR

Description: MHD phenomena in reversed shear plasmas in TFTR are described during each of the three phases of the evolution of these discharges: the current ramp, high power neutral beam heating and after the beam power has been reduced. Theoretical analysis of discharges which disrupted in the high-{beta} phase indicates that the {beta} - limit is set by the ideal n = 1 infernal/kink mode. The mode structure of the disruption precursor reconstructed from the electron temperature data compares favorably wit… more
Date: December 31, 1996
Creator: Manickam, J.; Fredrickson, E. & Chang, Z.
Partner: UNT Libraries Government Documents Department
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