<i>Superconducting Machines and Devices: Large Systems Applications</i>

Foner, S.; Schwartz, Brian B.; Laverick, C.

doi:10.1063/1.3069012

Cited by 5 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Advances in the processing of multifilamentary (MF) superconducting strand particularly during the late 1960s and early 1970s [1] were accompanied by a burgeoning interest in large-scale applications of superconductivity [2]. Both DC (high field magnets for particle acceleration, magnetohydrodynamic-based power, fusion, etc) and AC applications were being engineered.…”

Section: Introductionmentioning

confidence: 99%

AC loss in striped (filamentary) YBCO coated conductors leading to designs for high frequencies and field-sweep amplitudes

Sumption

Collings

Barnes

2004

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this bu den estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY) AFRL-PR-WP-TP-2006-201 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Propulsion Directorate Air Force Research Laboratory Air Force Materiel Command Wright-Patterson AFB, OH 45433-7251 SPONSORING/MONITORING AGENCY ACRONYM(S)AFRL-PR-WP SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-PR-WP-TP-2006-201 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. C 2005 IOP Publishing Ltd. This work is copyrighted. One or more of the authors is a U.S. Government employee working within the scope of their Government job; therefore, the U.S. Government is joint owner of the work and has the right to copy, distribute, and use the work. All other rights are reserved by the copyright owner. SUPPLEMENTARY NOTES ABSTRACTAC losses of YBCO coated conductors are investigated by calculation and experiment for the higher frequency regime. Previous research using YBCO film deposited onto single-crystal substrates demonstrated the effectiveness of 'striping' or filamentary subdivision as a technique for AC loss reduction. As a result of these studies the idea of subdividing YBCO 'coated conductors' (YBCO, overlayer, and even underlayer) into such stripes suggested itself. The suggestion was implemented by burning grooves into samples of coated conductor using laser micromachining. Various machining parameters were investigated, and the striping and slicing characteristics are presented. Loss measurements were performed on unstriped as well as striped samples by the pick-up coil technique at frequencies from 50 to 200 Hz at field sweep amplitudes of up to 150 mT. The effect of soft ferromagnetic Fe shielding was also investigated. The results of the experiments form a starting point for a more general study of reduced-loss coated conductor design (including hysteretic, coupling, normal eddy current, and transport losses) projected into higher ranges of frequency and field-sweep amplitude with transformer and allcryogenic-motor/generator applications in mind. As a result of these studies the idea of subdividing YBCO 'coated conductors' ...

show abstract

Section: Introductionmentioning

confidence: 99%

AC loss in striped (filamentary) YBCO coated conductors leading to designs for high frequencies and field-sweep amplitudes

Sumption

Collings

Barnes

2004

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Schering bridge measurement on RIS material have shown a capacitance decreasing with temperature and at least one local maximum of dissipation factor between room temperature and 77 K which is a frequently reported behavior of polar materials [14] [15]. The higher dissipation factor for the bushing under cryogenic conditions than at room temperature conditions does not necessarily mean that the insulator material itself has a higher dissipation factor for liquid nitrogen temperature.…”

Section: Discussionmentioning

confidence: 87%

Cryogenic testing of a 25 kV RIS bushing

Fink¹,

Fuhrmann²,

Zwecker³

2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

High voltage bushings for cryogenic current or voltage leads must master safely the special thermal stress in addition to the high voltage requirements. Resin impregnated synthetic (RIS) bushings have proven their usability for room temperature high voltage application since few years. Such paper free bushings are less hygroscopic than paper based bushings, which can be an advantage for components exposed to cryogenic temperatures on one side and to air conditions on the other. A conventional 25 kV, 2 kA room temperature RIS bushing was assembled to an open bath cryostat and subjected to five thermal cycles. High voltage tests were successfully performed under cryogenic conditions. No degradation of the bushing was found after the thermo-mechanical stress of the fast cool downs and one fast warm up. This paper focuses on the thermal tests.

show abstract

“…where zsk is the distance between the planes of s-th and k-th winds, the dependence is tabulated [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Theoretical and Experimental Researchesmentioning

confidence: 99%

The Use of a Magnetic Suspension for the Crucibleless Metal Melting

Kim

Panychev

Blazhko

2020

SSP

View full text Add to dashboard Cite

Nowadays, the magnetic suspension is widely used in metallurgy for crucibleless melting of metals. We carry out the contactless suspension of metal under the inductor (a source of the high-frequency field), using the forces of interaction of the eddy currents, which are induced in the metal with a high-frequency magnetic field causing them. Besides, such a method of the suspension of metals allows to carry out simultaneously its heating and melting at the expense of the energy of the electromagnetic field of suspension

show abstract

Superconducting Machines and Devices: Large Systems Applications

Abstract: Superconducting machines and devices.

Cited by 5 publications

References 0 publications

AC loss in striped (filamentary) YBCO coated conductors leading to designs for high frequencies and field-sweep amplitudes

AC loss in striped (filamentary) YBCO coated conductors leading to designs for high frequencies and field-sweep amplitudes

Cryogenic testing of a 25 kV RIS bushing

The Use of a Magnetic Suspension for the Crucibleless Metal Melting

Contact Info

Product

Resources

About