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in subjects: "Elmo Bumpy Torus"

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Hot-electron-ring physics

Separate abstracts were prepared for each of the 16 included papers. (MOW)

Date: June 1, 1982

Creator: Uckan, N.A. (ed.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

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: Report

Partner: UNT Libraries Government Documents Department

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Recent beam probe measurements on EBT, TMX, and RENTOR

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: Report

Partner: UNT Libraries Government Documents Department

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Vacuum system problems of EBT: a steady-state fusion experiment

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: Article

Partner: UNT Libraries Government Documents Department

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EBT-P gamma-ray shielding system

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: Report

Partner: UNT Libraries Government Documents Department

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Status of Oak Ridge National Laboratory fusion activities

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: Article

Partner: UNT Libraries Government Documents Department

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Introduction to magnetic confinement fusion diagnostics

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: Report

Partner: UNT Libraries Government Documents Department

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Hot-electron-ring physics

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: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear performance calculations for the ELMO Bumpy Torus Reactor (EBTR) reference design

The nuclear performance of the ELMO Bumpy Torus Reactor reference design has been calculated using the one-dimensional discrete ordinates code ANISN and the latest available ENDF/B-IV transport cross-section data and nuclear response functions. The calculated results include estimates of the spatial and integral heating rate with emphasis on the recovery of fusion neutron energy in the blanket assembly and minimization of the energy deposition rates in the cryogenic magnet coil assemblies. The … more

Date: December 1, 1977

Creator: Santoro, R. T. & Barnes, J. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Practical blanket design for a toroidal fusion reactor

This blanket concept will be examined for use in a tokamak, but the blanket described here is for an Elmo Bumpy Torus Reactor. In this reactor, the plasma region has a diameter of 2.4 meters under the coils, and a diameter of 3.4 meters in the ''bumps'' between coils. For either diameter the segments are divided into twelve buckets in the poloidal plane. There are nine toroidal segments between the center lines of two coils. The blanket is of uniform thickness for all segments, and this dimensi… more

Date: January 1, 1977

Creator: Bettis, E. S.; Barnes, J. M.; Huxford, T. J.; Liu, K. C.; Santoro, R. T. & Watts, H. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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RAYS: a geometrical optics code for EBT

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: Report

Partner: UNT Libraries Government Documents Department

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Error field generation of solenoid magnets

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: Article

Partner: UNT Libraries Government Documents Department

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Fast-wave ICRF heating for EBT-P

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: Article

Partner: UNT Libraries Government Documents Department

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One-dimensional gamma-ray shielding calculations for the EBT-P

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: Article

Partner: UNT Libraries Government Documents Department

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Optimization of confinement in toroidal systems: studies of tokamaks and ELMO Bumpy Torus

A brief listing is given of theoretical studies being carried out at ORNL on tokamaks and the ELMO Bumpy Torus. (MOW)

Date: January 1, 1980

Creator: Dory, R.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects of global field errors on ELMO Bumpy Torus

The plasma sensitivity to magnetic field error effects has been tested experimentally using externally introduced global field errors in the ELMO Bumpy Torus (EBT). A critical field (delta B/sub r//B)/sub cr/ approximately 0.6-1 x 10/sup -3/ was observed, below which the plasma is essentially free from convective cells, toroidal currents, and instabilities. The observed critical value is comparable to a neoclassical critical field error (delta B/sub r//B)/sub cr/ approximately equal to rho/R, t… more

Date: October 1, 1977

Creator: Quon, B. H.; Dandl, R. A.; Colestock, P. L. & Ikegami, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design of a spatially resolved T/sub I/ diagnostic system for EBT-S

A diagnostic neutral beam system is being designed to provide spatially resolved measurements of T/sub I/ on EBT-S. This installation will be the first step toward testing neutral beam heating in an EBT geometry and must be designed to be compatible with the intense microwave environment (isolation) and with the steady-state nature of EBT (particle control). The beam system will inject an intense (approx. .300 mA/cm/sup 2/) monoenergetic neutral beam (approx. .5 cm diam) perpendicular to the li… more

Date: January 1, 1979

Creator: Glowienka, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design features of the ELMO Bumpy Torus Reactor (EBTR)

The essential features of the EBTR described are: plasma engineering and physics, magnetics, mechanical design and neutronics. A time-dependent D-T plasma model was formulated to simulate the dynamic behavior of the system and to provide a framework for testing physics assumptions and models. The main goal in the magnetics areas was to satisfy the plasma constraints with a coil design which could be built with existing technology. Conceptual design of EBT reactors based on the modular concept (… more

Date: January 1, 1977

Creator: Uckan, N. A.; Bettis, E. S.; Hedrick, C. L.; Santoro, R. T.; Yeh, H. T.; Watts, H. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Diagnostic protection techniques in steady state, high power RF and microwave

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: Article

Partner: UNT Libraries Government Documents Department

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Hydrogen recycle modeling and measurements in tokamaks and EBT

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: Article

Partner: UNT Libraries Government Documents Department

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ELMO Bumpy Torus (EBT) reactor

The ELMO Bumpy Torus (EBT) concept has many encouraging and attractive features as a fusion reactor system. These include a high beta, magnetohydrodynamically stable equilibrium; absence of parallel currents; a large aspect ratio; the modular nature of individual sectors; no interlinking coils; ease of maintenance; steady-state operation; and economic potential. The first EBT reactor study was initiated in 1976 and provided the required starting point for continued assessment of the validity of… more

Date: January 1, 1977

Creator: Uckan, N. A.; Dandl, R. A.; Hedrick, C. L.; Bettis, E. S.; Lidsky, L. M.; McAlees, D. G. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ion Cyclotron Heating Experiments in EBT-S

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: Article

Partner: UNT Libraries Government Documents Department

open access

ELMO Bumpy Torus

The present understanding of equilibrium, stability, and transport in EBT suggests a sequence of research and development activities aimed at a full-scale reactor. The EBT program includes an aggressive development effort for high-power millimeter CW microwave sources based on the Cyclotron Resonant Maser principle. The existing physics evidence suggests that the EBT approach can be extended to confine steady-state, high-beta (toroidal) plasmas. If this extension is demonstrated, then EBT offer… more

Date: January 1, 1977

Creator: Dandl, R.A.; Dory, R.A. & Uckan, N.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fusion energy division annual progress report, period ending December 31, 1980

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: Report

Partner: UNT Libraries Government Documents Department