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in creator/contributor: "Niemann, R. C."

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Fabrication experiences and operative characteristics of the U. S. SCMC superconducting dipole magnet for MHD research

The U.S. SCMS superconducting dipole magnet system consists of the superconducting magnet and its cryostat, a helium liquifier and refrigerator/liquifier facility, helium storage dewars, the transfer line, power supply, and a complete system for magnet instrumentations and control. The magnet system has been designed and built by Argonne National Laboratory. The entire magnet system was successfully tested to full design field in May 1977. It was then safely delivered to Moscow in June 1977, an… more

Date: January 1, 1977

Creator: Wang, S. T.; Niemann, R. C. & Kustom, R. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electromagnetic interactions between the U-25 superconducting magnet and the U-25 B MHD flow train

Fluctuating voltage signals on the potential taps of the Argonne National Laboratory (ANL) 5.0 Tesla MHD Superconducting Dipole Magnet have been observed during MHD power generation at the U-25 B Facility at the High Temperature Institute (IVAN), Moscow, U.S.S.R. The voltage fluctuations are analyzed with special emphasis on magnet stability. Various other thermodynamic and electrical parameters of the U-25 B flow train have been recorded and statistical correlations between these signals and t… more

Date: January 1, 1978

Creator: Smith, R. P.; Niemann, R. C.; Kraimer, M. R. & Zinneman, T. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

APS storage ring vacuum system development

The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's materials research program. The Storage Ring's 1104 m circumference is divided into 40 sectors which contain vacuum, beam transport, control, rf and insertion device systems. The vacuum system will operate at a pressure of 1 nTorr and is fabricated from aluminum. The sy… more

Date: January 1, 1991

Creator: Niemann, R. C.; Benaroya, R.; Choi, M.; Dortwegt, R. J.; Ferry, R.; Goeppner, G. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ultimate Strength, Low Stress Creep Characteristics, and Thermal Intercept Methods for an Epoxy Fiberglass Tension Member Support

A support system utilizing epoxy fiberglass tension members will be used for the UTSI Superconducting Dipole Magnet. Elements of a support system have a basic member which is a link in which a composite is wound around a mandrel. This element uses the strength of the material fibers in a most advantageous way. The flexural and torsional load imputs to the link at its end must be minimized. A spherical bearing with a cylindrical outer surface functions as the central pin. Experience gained in th… more

Date: January 1, 1979

Creator: Niemann, R. C.; Gonczy, J. D.; Hoffman, J. A.; Mataya, K. F.; Smelser, P. & Young, W. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

APS storage ring vacuum system

The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's experimental program. The Storage Ring's 1104 m circumference is divided into 40 functional sectors. The sectors include vacuum, beam transport, control, acceleration and insertion device components. The vacuum system, which is designed to operate at a pressure of 1 n T… more

Date: January 1, 1990

Creator: Niemann, R. C.; Benaroya, R.; Choi, M.; Dortwegt, R. J.; Goeppner, G. A.; Gonczy, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Final design of a superconducting MHD magnet for the Coal-Fired Flow Facility at the University of Tennessee Space Institute

The superconducting magnet system (SCMS) consisting of the superconducting magnet, magnet cryostat, a helium refrigerator/liquefier facility, a helium gas-handling system, apparatus for cryogenic transfer and storage, a magnet power supply, a integrated instrumentation and control system including a computer for magnet operation, data acquisition, system status and diagnosis, and magnet protection is described. The complete system will be tested at Argonne and installed at the Coal-Fired Flow F… more

Date: January 1, 1979

Creator: Wang, S. T.; Turner, L. R.; Genens, L.; Pelczarski, W.; Hoffman, J.; Gonczy, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cryogenic aspects of the experience in operating the U-25 superconducting MHD magnet in conjunction with the MHD generator

In order to facilitate the rapid development of MHD technology for the generation of electrical energy, the U.S. and U.S.S.R. are jointly conducting research within the framework of the Program of Scientific and Technical Cooperation. The Institute for High Temperature (IVTAN) of the U.S.S.R. has designed and fabricated a special MHD facility which uses as its base much of the equipment of the existing U-25 Facility. The new MHD fow train consisting of a combustor, magnet, channel, and diffuser… more

Date: January 1, 1978

Creator: Niemann, R. C.; Mataya, K. F.; Smith, R. P.; McWilliams, D. A.; Borden, R.; Streeter, M. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and development of an ultra-thin solenoid for a high energy physics particle detector

An enhanced-stability thin solenoid magnet design is presented. The details of the high purity aluminum stabilized conductor are discussed. The design details of a special cryostat constructed for conductor evaluation is presented, and the aluminum alloy NbTi superconductor under procurement is described.

Date: January 1, 1978

Creator: Smith, R. P.; Niemann, R. C. & Catania, F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-gradient quadrupole magnet for a polarized-beam facility

A prototype quadrupole magnet with 2.8 m effective length is under design and construction for use in a polarized beam transport system at Fermi National Accelerator Laboratory. The operating gradient required is 50 T/m and the higher multipole error fields must not exceed a few parts in one thousand over a 10 cm diameter bore. For cryogenic efficiency the magnet will operate at 1000 amperes and a cold iron yoke will provide complete field shielding.

Date: January 1, 1980

Creator: Smith, R. P.; Hoffman, J. A.; Kim, S. H.; Mataya, K. F.; Niemann, R. C. & Turner, L. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Engineering Design of a High-Temperature Superconductor Current Lead

As part of the US Department of Energy's Superconductivity Pilot Center Program, Argonne National Laboratory and Superconductivity, Inc., are developing high-temperature superconductor (HTS) current leads suitable for application to superconducting magnetic energy storage systems. The principal objective of the development program is to design, construct, and evaluate the performance of HTS current leads suitable for near-term applications. Supporting objectives are to (1) develop performance c… more

Date: January 1, 1993

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J.R. (Argonne National Lab., IL (United States)); Daugherty, M. A. & Buckles, W. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance evaluations of demountable electrical connections

Electrical conductors operating in cryogenic environments can require demountable connections along their lengths. The connections must have low resistance and high reliability and should allow ready assembly and disassembly. In this work, the performance of two types of connections has been evaluated. The first connection type is a clamped surface-to-surface joint. The second connection type is a screwed joint that incorporates male and female machine-thread components. The connections for cop… more

Date: July 1, 1993

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Buckles, W. E. & Daugherty, M. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Engineering Design of a High-Temperature Superconductor Current Lead

As part of the US Department of Energy`s Superconductivity Pilot Center Program, Argonne National Laboratory and Superconductivity, Inc., are developing high-temperature superconductor (HTS) current leads suitable for application to superconducting magnetic energy storage systems. The principal objective of the development program is to design, construct, and evaluate the performance of HTS current leads suitable for near-term applications. Supporting objectives are to (1) develop performance c… more

Date: June 1, 1993

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Daugherty, M. A. & Buckles, W. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Low-thermal-resistance, high-electrical-isolation heat intercept connection

A method for providing a low-thermal-resistance, high-electrical-isolation heat intercept connection is presented. Electrical conductors often require the removal of heat produced from their normal operation. The heat can be removed by mechanical connection to a refrigeration source. Such connections require both effective heat removal (low thermal resistance) and effective electrical isolation (high electrical resistance and high dielectric strength). Such connections should be straightforward… more

Date: July 1, 1993

Creator: Niemann, R. C.; Gonczy, J. D. & Nicol, T. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Joining NbTi superconductors by ultrasonic welding

An important consideration in the design and construction of large, high-field, superconducting magnets is the capability to fabricate reliable, high-strength, low-resistance joints. A process for joining NbTi, copper stabilized, superconducting composites by ultrasonic welding is described. This process yields a joint strength comparable to that of the superconducting composite and a resistivity significantly lower than achieved by conventional soft soldering. The superconducting properties of… more

Date: January 1, 1976

Creator: Hafstrom, J. W.; Killpatrick, D. H.; Niemann, R. C.; Purcell, J. R. & Thresh, H. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thermal characteristics of a low-loss liquid-helium dewar

A liquid helium dewar has been designed, fabricated, and operated successfully with a minimum background heat-loss rate of only a few milliwatts. The objective is to provide a facility that can be used to measure relatively low heat-loss rate (1--100 milliwatts) in a liquid helium environment. The experimental system consists mainly of an inner helium reservoir within an outer helium reservoir that is thermally shielded from the room-temperature environment by multiple insulation layers in a va… more

Date: May 1, 1994

Creator: Cha, Y. S.; Niemann, R. C. & Hull, J. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thermally effective, electrically isolating heat intercept connections

Electrical and electronic equipment often require thermally effective beat intercept connections that provide electrical isolation. Such connections can be developed by clamping, with a thermal-interference fit, an electrically insulating cylindrical tube between a central disk and an outer ring. Heat flows radially through the disk-tube-ring assembly. Thermal effectiveness, i.e., {Delta}T for a given heat flux, and electrical isolation are controlled by tube geometry and material and by connec… more

Date: June 1995

Creator: Niemann, R. C.; Gonczy, J. D. & Nicol, T. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-temperature superconductor current leads for electric utility SMES applications

Current leads that utilize high-temperature superconductors (HTSS) to deliver power to devices operating at liquid helium temperature have the potential to reduce refrigeration requirements to levels significantly below those achievable with conventional leads. As part of the US Department of Energy`s Superconductivity Technology Program, Argonne National Laboratory and two industrial partners are developing HTS current leads for application to superconducting magnetic energy storage (SMES) sys… more

Date: July 1, 1995

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Buckles, W. E.; Weber, B. R.; Dixon, K. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cryocooler applications for high-temperature superconductor magnetic bearings.

The efficiency and stability of rotational magnetic suspension systems are enhanced by the use of high-temperature superconductor (HTS) magnetic bearings. Fundamental aspects of the HTS magnetic bearings and rotational magnetic suspension are presented. HTS cooling can be by liquid cryogen bath immersion or by direct conduction, and thus there are various applications and integration issues for cryocoolers. Among the numerous cryocooler aspects to be considered are installation; operating tempe… more

Date: May 22, 1998

Creator: Niemann, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance evaluation of high-temperature superconducting current leads for electric utility SMES systems

As part of the U.S. Department of Energy`s Superconductivity Technology Program, Argonne National Laboratory and Babcock & Wilcox are developing high-temperature super-conductor (HTS) current leads for application to electric utility superconducting magnetic energy storage systems. A 16,000-A HTS lead has been designed and is being constructed. An evaluation program for component performance was conducted to confirm performance predictions and/or to qualify the design features for construction.… more

Date: August 1, 1995

Creator: Niemann, R. C.; Cha, Y. S. & Hull, J. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

ANL Advanced Photon Source crotch absorber design

The ANL 7-GeV Advanced Photon Source storage ring crotch absorber will be subjected to a very high photon loading power density, approximately 750 W/mm{sup 2} at normal incidence. To accommodate this high heat load, two designs were studied: one is a V-type compound angle absorber and the other is a horizontally rotated plate absorber. For both models, thermal and structural analyses have been carried out using 3-D finite element analysis. The analysis indicates that the V-type compound angle a… more

Date: January 1, 1991

Creator: Choi, M.; Gonczy, J. D.; Howell, J. W. & Niemann, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design of a high-temperature superconductor current lead for electric utility SMES

Current leads that rely on high-temperature superconductors (HTSs) to deliver power to devices operating at liquid helium temperature have the potential to reduce refrigeration requirements to levels significantly below those achievable with conventional leads. The design of HTS current leads suitable for use in near-term superconducting magnetic energy storage (SMES) is in progress. The SMES system has an 0.5 MWh energy capacity and a discharge power of 30 MW. Lead-design considerations includ… more

Date: January 1, 1995

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Rey, C. M. & Dixon, K. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design of microchannels for cryostabilization of high temperature superconducting magnets

Microchannel cooling using subcooled liquid nitrogen is proposed to cryogenically stabilize high-temperature superconducting magnets. Various design constraints and parameters are identified and summarized. A graphical method is proposed for the design of microchannel systems. This graphical method helps to reduce the amount of work towards achieving optimum design for a specific application because there are a large number of parameters involved in the design of a microchannel system. The prop… more

Date: October 1, 1993

Creator: Cha, Y. S.; Hull, J. R. & Niemann, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and performance of low-thermal-resistance, high-electrical-isolation heat intercept connections

No Description Available.

Date: November 1, 1994

Creator: Niemann, R. C.; Gonczy, J. D.; Phelan, P. E. & Nicol, T. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High temperature superconducting current leads for micro-SMES application

SMES is being applied on a microscale (1--10 Mj stored energy) to improve electrical power quality. A major portion of the SMES refrigeration load is for cooling the conventional (copper, vapor- cooled) current leads that transfer energy between the magnet and the power-conditioning equipment. The lead refrigeration load can be reduced significantly by the use of high-temperature superconductors (HTSs). A HTS current lead suitable for micro-SMES application has been designed. The lower stage of… more

Date: September 1, 1993

Creator: Niemann, R. C.; Cha, Y. S.; Hull, J. R.; Buckles, W. E.; Weber, B. R. & Daugherty, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department