Search Results

Advanced search parameters have been applied.
open access

Three computer codes for safety and stability of large superconducting magnets

Description: For analyzing the safety and stability of large superconducting magnets, three computer codes TASS, SHORTURN, and SSICC have been developed, applicable to bath-cooled magnets, bath-cooled magnets with shorted turns, and magnets with internally cooled conductors respectively. The TASS code is described, and the use of the three codes is reviewed.
Date: January 1, 1985
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Electromagnetic analysis for fusion reactors: status and needs

Description: Electromagnetic effects have far-reaching implications for the design, operation, and maintenance of future fusion reactors. Two-dimensional (2-D) eddy current computer codes are available, but are of limited value in analyzing reactors. Three-dimensional (3-D) codes are needed, but are only beginning to be developed. Both 2-D and 3-D codes need verification against experimental data, such as that provided by the upcoming FELIX experiments. Coupling between eddy currents and deflections has app… more
Date: January 1, 1983
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Limits on the field of ohmic heating solenoids, applied to a tokamak TNS. [NbTi]

Description: If the ohmic heating solenoid for the TNS or other large tokamak is an ungraded cryostable superconducting solenoid, with NbTi at 4.2 K as the superconductor, then the smallest outer diameter is not achieved at the highest attainable field. There is a lower optimum field which minimizes the outer diameter for a given volt-second requirement. At higher fields the mean diameter decreases; but the high fields require more superconductor, more copper stabilizer, more stainless steel for support, an… more
Date: January 1, 1977
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Safety of superconducting fusion magnets: twelve problem areas

Description: Twelve problem areas of superconducting magnets for fusion reaction are described. These are: Quench Detection and Energy Dump, Stationary Normal Region of Conductor, Current Leads, Electrical Arcing, Electrical Shorts, Conductor Joints, Forces from Unequal Currents, Eddy Current Effects, Cryostat Rupture, Vacuum Failure, Fringing Field and Instrumentation for Safety. Priorities among these areas are suggested.
Date: January 1, 1979
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Safety of superconducting fusion magnets: twelve problem areas

Description: Twelve problem areas of superconducting magnets for fusion reaction are described. These are: Quench Detection and Energy Dump, Stationary Normal Region of Conductor, Current Leads, Electrical Arcing, Electrical Shorts, Conductor Joints, Forces from Unequal Currents, Eddy Current Effects, Cryostat Rupture, Vacuum Failure, Fringing Field and Instrumentation for Safety. Each is described under the five categories: Identification and Definition, Possible Safety Effects, Current Practice, Adequacy … more
Date: May 1, 1979
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Solution to workshop problem 6 (hollow sphere) in the shell approximation with EDDYNET-2D

Description: The problem of the hollow sphere in a sinusoidal field has been solved in the single shell approximation with the code EDDYNET. Solutions with three different meshes are compared among themselves and with axisymmetric solutions obtained by 2-D codes. Agreement is good for total current and for field at points outside the sphere. Agreement is fair for field at interior points, where the field results from near cancellation of applied and induced fields. Agreement is poor for power dissipation an… more
Date: November 1, 1986
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

FELIX experiments and computational needs for eddy current analysis of fusion reactors

Description: In a fusion reactor, changing magnetic fields are closely coupled to the electrically-conducting metal structure. This coupling is particularly pronounced in a tokamak reactor in which magnetic fields are used to confine, stabilize, drive, and heat the plasma. Electromagnetic effects in future fusion reactors will have far-reaching implications in the configuration, operation, and maintenance of the reactors. This paper describes the impact of eddy-current effects on future reactors, the requir… more
Date: January 1, 1984
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Eddy current analysis in fusion devices

Description: In magnetic fusion devices, particularly tokamaks and reversed field pinch (RFP) experiments, time-varying magnetic fields are in intimate contact with electrically conducting components of the device. Induced currents, fields, forces, and torques result. This note reviews the analysis of eddy current effects in the following systems: Interaction of a tokamak plasma with the eddy currents in the first wall, blanket, and shield (FWBS) systems; Eddy currents in a complex but two-dimensional vacuu… more
Date: June 1, 1988
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Safety of superconducting magnets for fusion: thermal and electromagnetic effects of rapid TF coil discharge

Description: The most rapid discharge of a TF coil caused from a discontinuity of current path, as might result from the burning of a current lead or the failure of an internal or external conductor joint. The discontinuity will cause a sudden very high voltage and arcing, not only where the discontinuity occurred, but at several other points in the system as well. The subsequent discharge of the TF coil will depend on the effective electrical resistance of the arcs. The consequences of a sudden resistive v… more
Date: January 1, 1980
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Safety of superconducting magnets for fusion: thermal analysis of large cryostable magnets

Description: A thermal analysis program has been developed to study the response of a cryostable fusion magnet to abnormal conditions such as a localized heat input, overcurrent, or uncooled length of conductor. It performs a heat balance on each element. Variation of parameters with temperature, pressure, and magnetic field are incorporated. The program has been applied to a conductor with magnetic field variation along its length, carrying a high current as might occur in one toroidal field coil when a ne… more
Date: January 1, 1980
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

The regional electromagnetics workshop in the USA

Description: At the Second Regional Workshop, held at Argonne National Laboratory 23 to 24 June 1986, fifteen participants from four countries heard ten presentations on Problems 1, 2, and 6. This note includes information about the workshop and summaries of the results for Problems 1 and 2.
Date: November 1, 1986
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Simulation of multiple stability regions in an internally cooled superconducting conductor with the computer code SSICC

Description: The computer code SSICC (Safety and Stability of Internally Cooled Conductors) has successfully simulated the multiple stability regions observed experimentally by Lue, Miller, and Dresner of Oak Ridge National Laboratory. The simulation requires asymmetrical boundary conditions and a heating pulse duration short compared to the time for reflection of the transient pressure wave back into the heated region of the conductor.
Date: August 1, 1984
Creator: Turner, L. R. & Shindler, J.
Partner: UNT Libraries Government Documents Department
open access

Detailed technical plan for Test Program Element-III (TPE-III) of the first wall/blanket shield engineering test program

Description: The experimental requirements, test-bed design, and computational requirements are reviewed and updated. Next, in Sections 3, 4 and 5, the experimental plan, instrumentation, and computer plan, respectively, are described. Finally, Section 6 treats other considerations, such as personnel, outside participation, and distribution of results.
Date: March 1, 1982
Creator: Turner, L. R. & Praeg, W. F.
Partner: UNT Libraries Government Documents Department
open access

Coupling between angular deflection and eddy currents in the FELIX plate experiment

Description: For a conducting body experiencing superimposed changing and steady magnetic field, for example a limiter in a tokamak during plasma quench, the induced eddy currents and the deflections resulting from those eddy currents are coupled. Experimental study of these coupled deflections and currents can be performed with the FELIX (Fusion Electromagnetic Induction Experiment) facility nearing completion at ANL. Predictions of the coupling are described, as computed with the code EDDYNET, which has b… more
Date: August 1, 1983
Creator: Turner, L. R. & Cuthbertson, J. W.
Partner: UNT Libraries Government Documents Department
open access

Electromagnetic effects on the FED/INTOR limiter

Description: Electromagnetic effects were among the critical issues of the impurity control system examined in the 1982 FED/INTOR design study. During a plasma disruption, the decaying plasma current induces voltages and currents in the first wall and limiter systems which can produce arcing between limiter segments and large forces and torques on the limiter. The effects of first wall time constant, limiter electrical resistance, and limiter segmentation on the voltages, forces, and torques were studied.
Date: January 1, 1983
Creator: Turner, L. R. & Foss, M. H.
Partner: UNT Libraries Government Documents Department
open access

Coupling between eddy currents and rigid body rotation: analysis, computation, and experiments

Description: Computation and experiment show that the coupling between eddy currents and the angular deflections resulting from those eddy currents can reduce electromagnetic effects such as forces, torques, and power dissipation to levels far less severe than would be predicted without regard for the coupling. This paper explores the coupling effects beyond the parameter range that has been explored experimentally, using analytical means and the eddy-current computer code EDDYNET. The paper also describes … more
Date: January 1, 1985
Creator: Hua, T. Q. & Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Safety and stability of superconducting magnets for fusion using internally cooled conductors

Description: Vincent Arp's computer code for the stability analysis of internally cooled conductors (ICC) has been combined with ANL's TASS code to create the code SSICC for the analysis of the safety and stability of ICC. The code has been tested against the ICC experiments of Lue, Miller, and Dresner, and applied to the FED TF coil conductor.
Date: January 1, 1982
Creator: Turner, L. R. & Ryne, R. D.
Partner: UNT Libraries Government Documents Department
open access

Experimental study of coupling between eddy currents and deflections in cantilevered beams as models of tokamak limiters

Description: The coupling between eddy current and motion in a cantilevered beam is examined. The beam, which provides a simple model for the limiter blades of a tokamak fusion reactor, was subjected to simultaneous orthogonal time-varying and constant magnetic fields. The dynamic deformation of the beam includes two different modes: a bending mode and a torsional mode. Interaction of current with each mode and with the combined modes of vibration in described. Experimental verification of the case without … more
Date: January 1, 1986
Creator: Turner, L. R. & Hua, T. Q.
Partner: UNT Libraries Government Documents Department
open access

3-D transient eddy current calculations for the FELIX cylinder experiments

Description: The three-dimensional eddy current transient field problem is formulated first using the U-V method. This method breaks the vector Helmholtz equation into two scalar Helmholtz equations. Null field integral equations and the appropriate boundary conditions are used to set up an identification matrix which is independent of null field point locations. Embedded in the identification matrix are the unknown eigenvalues of the problem representing its impulse response in time. These eigenvalues are … more
Date: December 1, 1986
Creator: Davey, K. R. & Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

2-D and 3-D computations of curved accelerator magnets

Description: In order to save computer memory, a long accelerator magnet may be computed by treating the long central region and the end regions separately. The dipole magnets for the injector synchrotron of the Advanced Photon Source (APS), now under construction at Argonne National Laboratory (ANL), employ magnet iron consisting of parallel laminations, stacked with a uniform radius of curvature of 33.379 m. Laplace's equation for the magnetic scalar potential has a different form for a straight magnet (x… more
Date: January 1, 1991
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

New directions for the TEAM workshops

Description: I consider it a great honor to be invited to speak at this, the first TEAM Workshop to take place in China. This is my first visit to China, and I am struck by the beauty of the country, by the kindness of the people I have met here, and by the rapid progress being made in every area. The topic I have chosen for this talk is New Directions for TEAM.'' But it has been said that in order to know where you are going, you must first know where you are and where you have been. So I will talk about t… more
Date: January 1, 1992
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

3-D field computation: The near-triumph of commerical codes

Description: In recent years, more and more of those who design and analyze magnets and other devices are using commercial codes rather than developing their own. This paper considers the commercial codes and the features available with them. Other recent trends with 3-D field computation include parallel computation and visualization methods such as virtual reality systems.
Date: July 1995
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
open access

New Directions for the TEAM Workshops

Description: I consider it a great honor to be invited to speak at this, the first TEAM Workshop to take place in China. This is my first visit to China, and I am struck by the beauty of the country, by the kindness of the people I have met here, and by the rapid progress being made in every area. The topic I have chosen for this talk is ``New Directions for TEAM.`` But it has been said that in order to know where you are going, you must first know where you are and where you have been. So I will talk about… more
Date: December 31, 1992
Creator: Turner, L. R.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen