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in subjects: "Solenoids"

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Aging assessment of BWR control rod drive systems

This study examines the aging phenomena associated with boiling water reactor (BWR) control rod drive mechanisms (CRDMs) and assess the merits of various methods of managing this aging. Information for this study was acquired from (1) the results of a special CRDM aging questionnaire distributed to each US BWR utility, (2) a first-of-its-kind workshop held to discuss CRDM aging and maintenance concerns, (3) an analysis of Nuclear Plant Reliability Data System (NPRDS) failure cases attributed to… more

Date: January 1, 1991

Creator: Greene, R.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Engineering design solutions of flux swing with structural requirements for ohmic heating solenoids

Here a more detailed publication is summarized which presents analytical methods with solutions that describe the structural behavior of ohmic heating solenoids to achieve a better understanding of the relationships between the functional variables that can provide the basis for recommended design improvements. The solutions relate the requirements imposed by structural integrity to the need for producing sufficient flux swing to initiate a plasma current in the tokamak fusion machine. A method… more

Date: September 30, 1977

Creator: Smith, R. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of the working group on the construction and demonstration of a Siberian Snake

It was recognized as long ago as the 1977 Ann Arbor Meeting on Higher Energy Polarized Proton Beams that a ''Siberian Snake'' should be built and tested in an operating accelerator. A program to accomplish this at Argonne National Laboratory (ANL) was part of a proposal to DOE to construct a small R and D accelerator at ANL. This was never implemented and between then and now many theory papers have been written but no Proof of Principle Experiment (POPE) has been done. The present Ann Arbor wo… more

Date: January 1, 1985

Creator: Ratner, L. G. & Raylman, R. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Pulse voltage circuits

The problems associated with very high voltages may be avoided in part by a variety of pulse-multiplication techniques. These methods are quite varied but share two features, the use of modest dc voltages and the use of switching techniques, to produce in some manner a vectorial transient addition of voltages. Many such methods exist, but only the Marx blank, spiral generator, inversion generator, and Blumlein will be addressed here in detail. Two other methods will be given a brief discussion … more

Date: January 1, 1980

Creator: Willis, W. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Operation of a forced two phase cooling system on a large superconducting magnet

This paper describes the operation of a forced two phase cooling system on a two meter diameter superconducting solenoid. The magnet is a thin high current density superconducting solenoid which is cooled by forced two phase helium in tubes around the coil. The magnet, which is 2.18 meters in diameter and 3.4 meters long, has a cold mass of 1700 kg. The two phase cooling system contains less than 300 liters of liquid helium, most of which is contained in a control dewar. This paper describes th… more

Date: May 1, 1980

Creator: Green, M.A.; Burns, W.A.; Eberhard, P.H.; Gibson, G.H.; Pripstein, M.; Ross, R.R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Results from a model system of superconducting solenoids and phase shifting bridge for pulsed power studies for proposed tokamak EF coils

A matched pair of superconducting solenoids and a phase-shifting bridge circuit has been constructed to study energy storage and transfer for application to tokamak EF coils. The intrinsically stable solenoids, each with 4 H self-inductance, incorporate sufficient cooling to allow charging at several hundred volts, corresponding to B = 1 T/sec. The three-phase inductor-convertor capacitive bridge network operating at up to 150 V rms transfers energy reversibly and at controllable rates from the… more

Date: January 1, 1977

Creator: Fuja, R. E.; Kustom, R. L. & Smith, R. P.

Item Type: Article

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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LBL neutralized beam focusing experiment

An intense neutralized Cs/sup +1/ beam has been focused by an electrostatic polarization field induced by a solenoidal magnetic field of 10-25 gauss. This report describes the experiment and compares the results with the predictions of an analytic linearized fluid model and a particle-in-cell simulation which treats the motion of the warm electrons in detail.

Date: May 1, 1985

Creator: Krafft, G. A.; Kim, C. H. & Smith, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Studies of the Formation of Field Reversed Plasma by a Magnetized Co-Axial Plasma Gun

The gun injects axially into a drift tank followed by a magnetic mirror. For the experiments reported here, only the guide coils outside the vacuum vessel and solenoids on the plasma gun electrodes were used; the mirror coil was not energized. A stainless steel flux conserver is placed in the mirror throat to prevent the plasma from contacting the nonconducting vacuum wall in the region of the mirror. An axis encircling array of magnetic loop probes includes four diamagnetic loops and a loop wh… more

Date: May 28, 1980

Creator: Turner, W. C.; Granneman, E. H. A.; Hartman, C. W.; Prono, D. S.; Taska, J. & Smith, A. C., Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Magnet innovations for linacs

It is possible to produce large magnetic fields at the aperture of permanent magnet quadrupoles, even when the magnetic aperture is very small. That, combined with their compactness, makes permanent magnet quadrupoles very powerful components of small aperture linacs. Results will be presented about past and present work on both fixed and variable strength permanent magnets suitable for use in and around linacs.

Date: June 1, 1986

Creator: Halbach, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Finite element stress analysis of orthotropic solenoids

The mechanical behavior of superconducting magnets deviates from isotropy due to their construction techniques, which involve the layering of superconductor, insulation, and sometimes structural reinforcement within the windings. This paper describes a finite element stress analysis which has been extended to consider the effects of orthotropic material properties, as well as differential thermal contraction and spatially varying magnetic body forces. The procedure is applicable to all arbitrar… more

Date: January 1, 1977

Creator: Gray, W.H. & Akin, J.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress on the superconducting magnet for the time projection chamber experiment (TPC) at PEP

The TPC (Time Projection Chamber) experiment at PEP will have a two meter inside diameter superconducting magnet which creatests a 1.5 T uniform solenoidal field for the TPC. The superconducting magnet coil, cryostat, cooling system, and the TPC gas pressure vessel (which operatests at 11 atm) were designed to be about two thirds of a radiation length thick. As a result, a high current density coil design was chosen. The magnet is cooled by forced flow two phase helium. The TPC magnet is the la… more

Date: January 1, 1980

Creator: Green, M.A.; Eberhard, P.H. & Burns, W.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Test results and design details of the Tohoku Bubble Chamber magnet

Fermilab has successfully tested an iron bound 3 Tesla superconducting solenoid for the Tohoku Bubble Chamber. Thermal performance, magnetic fields, charging characteristics, and a special Ni30%Fe dump resistor are reported. Low heat leak is obtained by thermally intercepting the supports with boiloff gas. 4 refs., 5 figs.

Date: September 1, 1985

Creator: Craddock, W.; Grozis, C. & Mruzek, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Large superconducting detector magnets with ultra thin coils for use in high energy accelerators and storage rings

The development of a new class of large superconducting solenoid magnets is described. High energy physics on colliding beam machines sometimes require the use of thin coil solenoid magnets. The development of these magnets has proceeded with the substitution of light materials for heavy materials and by increasing the current density in the coils. The Lawrence Berkeley Laboratory has developed a radical approach to the problem by having the coil operate at very high current densities. This app… more

Date: August 1, 1977

Creator: Green, Michael A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects of misalignments of the solenoid of the colliding-beams detector on the orbit of the beams

Because the solenoid is very weak for 1 TeV beams, the alignment tolerances as far as the beams are concerned can be negligibly loose (The tolerances will be determined rather by accuracies for the measurement and analysis of particle tracks.) and there is no need to compensate for its orbital effects.

Date: October 1, 1982

Creator: Teng, L.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Polarized H/sup -/ source development at BNL

The AGS polarized H/sup -/ source (PONI-1) now produces currents of 25-40 ..mu..A, and has operated reliably during polarized physics runs. A new polarized source, having as its goal mA's of H-vector, is now under development. An atomic hydrogen beam has been cooled to about 20 K with a forward flux of approx.10/sup 19/ atoms/s/sr. A superconducting solenoid having a calculated acceptance angle of 0.1 sr for the cold H/sup 0/ beam, is now being built. An ionizer for the resulting polarized H/su… more

Date: January 1, 1986

Creator: Alessi, J.G.; Hershcovitch, A.; Kponou, A.; Niinikoski, T. & Sluyters, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-field superconducting solenoids for the TIBER II PF (poloidal-field) system

The poloidal-field (PF) coil set for the Tokamak Ignition/Burn Engineering Reactor (TIBER-II) consists of 24 solenoid modules, 16 of which are stacked inside the toroidal-field (TF) system at the center of the machine. These central solenoid modules operate at high-current densities, and maximum fields at the windings approach 14 T. Although TIBER-II is designed for steady-state operation with noninductive current drive, other operating scenarios are also considered. In the pulsed or inductive … more

Date: October 7, 1987

Creator: Kerns, J. A.; Miller, J. R. & Summers, L. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Data acquisition system for SLD

This paper describes the data acquisition system planned for the SLD detector which is being constructed for use with the SLAC Linear Collider (SLC). An exclusively FASTBUS front-end system is used together with a VAX-based host system. While the volume of data transferred does not challenge the band-width capabilities of FASTBUS, extensive use is made of the parallel processing capabilities allowed by FASTBUS to reduce the data to a size which can be handled by the host system. The low repetit… more

Date: May 1, 1985

Creator: Sherden, D.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of a large solid angle pion channel for a medical application utilizing current sheets and solenoid elements

For the treatment of tumors with pi-minus mesons (pions), a pion channel with a large solid angle is essential. A parallel beam of uniform density and reasonable size at the patient position is favored from the practical point of view. A new pion channel with sixty toroidal current sheets and some solenoids is shown to meet these requirements. It would also be useful for some physics experiments using low-energy pion and muon beam.

Date: May 1, 1980

Creator: Sugimitsu, T. & Swenson, D.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Results from a model system of superconducting solenoids and phase shifting bridge for pulsed power studies for proposed tokamak EF coils

A matched pair of superconducting solenoids and a phase-shifting bridge circuit has been constructed to study energy storage and transfer for application to tokamak EF coils. The intrinsically stable solenoids, each with 4 H self-inductance, incorporate sufficient cooling to allow charging at several hundred volts, corresponding to B approximately equal 1 T/sec. The three-phase inductor-convertor capacitive bridge network operating at up to 150 V rms transfers energy reversibly and at controlla… more

Date: January 1, 1977

Creator: Fuja, R. E.; Kustom, R. L. & Smith, R. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Status of the ATLAS PIIECR ion source project

The ATLAS PIIECR ion source is a major component of a project which will result in the replacement of the ATLAS tandem electrostatic injector with a superconducting linac of extremely low velocity profile and an ECR ion source operating in the continuous mode. A compilation of the source parameters adopted is tabulated, and the various issues considered in the design process and decisions made regarding those issues are discussed. (LEW)

Date: January 1, 1986

Creator: Pardo, R.; Minehara, E.; Lynch, F.; Billquist, P.; Evans, W.; Clifft, B. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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System design for the new TMX machine

The Tandem Mirror Experiment (TMX) is designed to test the physics of a new approach to Q-enhancement in open confinement systems. In the tandem mirror concept, the ends of a long solenoid are plugged electrostatically by means of ambipolar potential barriers created in two mirror machines or plugs, one at each end of the solenoid. The ambipolar potential in mirror machines develops as a consequence of the higher scattering rate of electrons and the balancing of electron and ion loss rates. The… more

Date: October 19, 1977

Creator: Chargin, A. K.; Calderon, M. O.; Mooney, L. J. & Vogtlin, G. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Use of magnetic materials in excimer laser circuits

The use of saturating magnetic materials in laser excitation discharge systems is presented. Particular attention is given to the most important parameters of magnetic materials and to the analysis of some circuits such as single and multi-stage pulse compressor and pre-pulse isolation systems. 25 refs.,5 figs.

Date: January 1, 1987

Creator: Vannini, M.; Sze, R. & Hommeau, F.

Item Type: Article

Partner: UNT Libraries Government Documents Department