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Electron heating and confinemet measurements in EBT-S using Thomson scattering

Description: Thomson scattering of ruby laser light was used to measure electron temperatures and densities in the ELMO Bumpy Torus-Scale (EBT-S) at Oak Ridge National Laboratory. The measurements were made primarily during May 1980, although some were taken during January 1980. The scattering system, which was designed for very low electron density measurements, features a 14-J ruby laser, a high-throughput spectrometer, and 15% quantum efficiency photomultipliers. The measured electron densities lie in th… more
Date: September 1, 1980
Creator: Bighel, L. & Cobble, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent beam probe measurements on EBT, TMX, and RENTOR

Description: It is noted that beam probe systems can provide accurate, reliable measurments of plasma space potential and nf(T/sub e/). Over some temperature range, at least, it should be possible to separate n and T/sub e/ by measuring the multiple ionization reaction products. It is also an ideal diagnostic for studying fluctuations since it provides a simultaneous measurement of phi and nf(T/sub e/) from the same point in the plasma and the measurements are continuous in time. Measurements can be made qu… more
Date: June 1, 1980
Creator: Hickok, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Vacuum system problems of EBT: a steady-state fusion experiment

Description: Many of the vacuum problems faced by EBT will soon be shared by other plasma devices as high-power microwave systems and long pulse lengths become more common. The solutions used on EBT (such as the raised lip with elastomer seal) are not unique; however, experience has shown that microwave-compatible designs must be carefully thought out. All details of the vacuum must be carefully thought out. All details of the vacuum must be carefully screened in advance to insure that microwaves do not lea… more
Date: January 1, 1981
Creator: Livesey, R.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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EBT-P gamma-ray shielding system

Description: An elaborate study was carried out for the coil and biological shield of the ELMO Bumpy Torus proof-of-principle (EBT-P) device. A three-dimensional scoping study for the coil shield was performed for four different shielding options to define the heat load for each component and check the compliance with the design criterion of 10 watts maximum heat per coil from the gamma ray sources. Also, a detailed biological dose survey was performed which included: (a) the dose equivalent inside and outs… more
Date: December 1, 1981
Creator: Gohar, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Status of Oak Ridge National Laboratory fusion activities

Description: This review covers the following research being carried out at ORNL: (1) confinement experiments such as ATF, EBT, and STX, (2) theory, (3) atomic physics, (4) shielding, (5) technology developments on superconducting magnets, pellet injection, rf plasma heating, and materials, and (6) fusion engineering design center. (MOW)
Date: January 1, 1985
Creator: Rosenthal, M.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Introduction to magnetic confinement fusion diagnostics

Description: These notes present a brief survey of some of the current diagnostic techniques used in magnetic fusion plasma devices. To give an idea of the range of parameters and geometries encountered the parameters of four representative experiments - PLT, TMX, ZT-40 and EBT-I(S) - are given. The central issue of all experiments is to understand the flow of power which can be summarized by two volume integrated equations for the ions and electrons.
Date: June 6, 1980
Creator: Turner, W.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hot-electron-ring physics

Description: Separate abstracts were prepared for each of the 24 included papers. The remaining paper appeared previously in ERA. (MOW)
Date: June 1, 1982
Creator: Uckan, N.A. (ed.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RAYS: a geometrical optics code for EBT

Description: The theory, structure, and operation of the code are described. Mathematical details of equilibrium subroutiones for slab, bumpy torus, and tokamak plasma geometry are presented. Wave dispersion and absorption subroutines are presented for frequencies ranging from ion cyclotron frequency to electron cyclotron frequency. Graphics postprocessors for RAYS output data are also described.
Date: April 1, 1982
Creator: Batchelor, D.B. & Goldfinger, R.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Error field generation of solenoid magnets

Description: Many applications for large solenoids and solenoidal arrays depend on the high precision of the axial field profile. In cases where requirements of ..delta..B/B for nonaxial fields are on the order of 10/sup -4/, the actual winding techniques of the solenoid need to be considered. Whereas an ideal solenoid consisting of current loops would generate no radial fields along the axis, in reality, the actual current-carrying conductors must follow spiral or helical paths. A straightforward method fo… more
Date: January 1, 1982
Creator: Saunders, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fast-wave ICRF heating for EBT-P

Description: Supplementary ion heating will play a major role in advancing the physics understanding of bumpy tori in EBT-P. Fast-wave ICRF heating is the method selected for EBT-P because of the successful ICRF heating experiments on tokamaks and on EBT-S. Given neoclassical electron behavior, then 2 MW of ICRF heating in the range of 60 to 90 MHz should be sufficient for the achievement of all the goals for ion heating, including 5% core plasma beta at the rings.
Date: January 1, 1982
Creator: Baity, F.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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One-dimensional gamma-ray shielding calculations for the EBT-P

Description: Due to the expected large loss of electrons on the magnetic coil assemblies and other components of the proposed EBT-P plasma device, the induced gamma-ray field from bremsstrahlung will be very intense. These gamma rays will yield increased heating loads on the superconducting cryogenic coils as well as produce a significant biological hazard. In this summary, the results from a series of one-dimensional calculations in which the gamma-ray heating loads were determined are presented for severa… more
Date: January 1, 1980
Creator: Lillie, R.A.; Gabriel, T.A.; Bishop, B.L. & Baker, V.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diagnostic protection techniques in steady state, high power RF and microwave

Description: The use of high power RF and microwave heating in the range of 10's of MHz through 10's of GHz in the next generation devices will require that diagnostics be hardened and isolated from the plasma and heating environment. Diagnostics used on the ELMO Bumpy Torus (EBT) have been faced with such a hostile environment, in steady state, and solutions have evolved to make diagnostic measurements possible.
Date: January 1, 1982
Creator: Glowienka, J.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hydrogen recycle modeling and measurements in tokamaks and EBT

Description: A model for hydrogen recycling developed for use in a Tokamak transport code is described and compared with measurements on ISXB and DITE. The model includes kinetic reflection of charge-exchange neutrals from the wall and deposition, thermal diffusion and desorption processes in the wall. In a Tokamak with a limiter, the inferred recycle coefficient of 0.9 to 1.0 is due primarily to reflection (0.8 to 0.9) with the remainder (0.1 to 0.2) being due to desorption. Laboratory experiments supply m… more
Date: January 1, 1980
Creator: Howe, H.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ion Cyclotron Heating Experiments in EBT-S

Description: Fast-wave heating and propagation experiments in the ion cyclotron range of frequencies (ICRF) have been carried out on EBT-S under steady-state conditions at power levels up to 20 kW and under pulsed conditions at power levels up to 100 kW. The waves were launched using a single Faraday-shielded loop antenna installed on the midplane of one of the 24 cavity sectors. Substantial ion heating was observed at frequencies above the second harmonic for hydrogen plasmas and at frequencies above the t… more
Date: January 1, 1982
Creator: Baity, F. W.; Davis, W. A.; Eldridge, O. C.; Glowienka, J. C.; Hillis, D. L.; Rasmussen, D. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fusion energy division annual progress report, period ending December 31, 1980

Description: The ORNL Program encompasses most aspects of magnetic fusion research including research on two magnetic confinement programs (tokamaks and ELMO bumpy tori); the development of the essential technologies for plasma heating, fueling, superconducting magnets, and materials; the development of diagnostics; the development of atomic physics and radiation effect data bases; the assessment of the environmental impact of magnetic fusion; the physics and engineering of present-generation devices; and t… more
Date: November 1, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CTR plasma engineering studies. Annual progress report, 1 November 1981-30 October 1982

Description: During FY 82, much effort was devoted to work in support of alternate confinement concepts, especially those involving field reversal. This work includes: (1) development of particle and energy confinement scaling for the Reversed Field Pinch (RFP) and the Field Reversed Theta Pinch (FRTP), and (2) analysis of start-up (heating and plasma build) for the spheromak and Field Reversed Mirror (FRM). In addition, a block of projects were concerned with fusion product effects, including heating and a… more
Date: January 1, 1982
Creator: Miley, George H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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One-dimensional gamma-ray shielding analysis for EBT-P

Description: A one-dimensional scoping study was performed for the gamma ray shield of the ELMO Bumpy Torus proof-of-principle (EBT-P) device. The objective was to define appropriate shielding material and determine the required shielding thickness for EBT-P. The dose equivalent results as a function of the radiation shield thickness for different shielding options are presented. A sensitivity analysis for the pessimistic case is given. The recommended shielding option based on the performance and cost is d… more
Date: November 1, 1981
Creator: Gohar, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reactor Assessments of Advanced Bumpy Torus Configurations

Description: Recently, several configurational approaches and concept improvement schemes were introduced for enhancing the performance of the basic ELMO Bumpy Torus (EBT) concept and for improving its reactor potential. These configurations include planar racetrack and square geometries, Andreoletti coil systems, and bumpy torus-stellarator hybrids (which include twisted racetrack and helical axis stellarator-snakey torus). Preliminary evaluations of reactor implications of each of these configurations hav… more
Date: January 1, 1983
Creator: Uckan, N. A.; Owen, L. W.; Spong, D. A.; Miller, R. L.; Ard, W. B.; Pipkins, J. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron transport in EBT in the low collision frequency limit

Description: A variational principle formulation is used to calculate the electron neoclassical transport coefficients in a bumpy torus for the low collisionality regime. The electron radial drift is calculated as a function of the plasma position and the poloidal electric field which is determined self-consistently. A bounce-averaged differential collision operator is used and the results are compared to previous treatments using a BGK operator.
Date: January 1, 1983
Creator: Hastings, D.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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EBT reactor analysis

Description: This report summarizes the results of a recent ELMO Bumpy Torus (EBT) reactor study that includes ring and core plasma properties with consistent treatment of coupled ring-core stability criteria and power balance requirements. The principal finding is that constraints imposed by these coupling and other physics and technology considerations permit a broad operating window for reactor design optimization. Within this operating window, physics and engineering systems analysis and cost sensitivit… more
Date: August 1, 1983
Creator: Uckan, N. A.; Jaeger, E. F.; Santoro, R. T.; Spong, D. A.; Uckan, T.; Owen, L. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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EBT ring physics

Description: This workshop attempted to evaluate the status of the current experimental and theoretical understanding of hot electron ring properties. The dominant physical processes that influence ring formation, scaling, and their optimal behavior are also studied. Separate abstracts were prepared for each of the 27 included papers. (MOW)
Date: April 1, 1980
Creator: Uckan, N.A. (ed.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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