摘要 :
The superconducting magnet under consideration for the proposed Superconducting Super Collider (SSC) uses a two layer coil geometry and is optimized for 6.6 T central field. In this paper we assess if it is possible to design a di...
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The superconducting magnet under consideration for the proposed Superconducting Super Collider (SSC) uses a two layer coil geometry and is optimized for 6.6 T central field. In this paper we assess if it is possible to design a dipole having a realistic single layer coil configuration, using a cable having the same size as that used in the present SSC outer layer coil, can achieve a central field of about 6 T. The affirmative answer assumes a superconductor current density approaching the best achieved thus far in production, close-coupled cold iron with at most a very thin collar, a high but not unreasonable current density in copper at quench, and operation below 4.2 K. The performance under other operating conditions will also be discussed. We shall first describe the cable used in this design. We shall discuss the optimization procedure of the iron shape, particularly in the aperture region to minimize the effects of iron saturation. We shall outline the design of a realistic single layer coil geometry. Finally we shall discuss various operating parameters from the quench protection point of view. (ERA citation 12:035480)
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摘要 :
The superconducting magnet under consideration for the proposed Superconducting Super Collider (SSC) uses a two layer coil geometry and is optimized for 6.6 T central field. In this paper we assess if it is possible to design a di...
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The superconducting magnet under consideration for the proposed Superconducting Super Collider (SSC) uses a two layer coil geometry and is optimized for 6.6 T central field. In this paper we assess if it is possible to design a dipole having a realistic single layer coil configuration, using a cable having the same size as that used in the present SSC outer layer coil, can achieve a central field of about 6 T. The affirmative answer assumes a superconductor current density approaching the best achieved thus far in production, close-coupled cold iron with at most a very thin collar, a high but not unreasonable current density in copper at quench, and operation below 4.2 K. The performance under other operating conditions will also be discussed. We shall first describe the cable used in this design. We shall discuss the optimization procedure of the iron shape, particularly in the aperture region to minimize the effects of iron saturation. We shall outline the design of a realistic single layer coil geometry. Finally we shall discuss various operating parameters from the quench protection point of view. (ERA citation 12:035480)
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In the quarter from January 1 through March 31, 1998 American Superconductor continued to concentrate on tasks in the following areas: cryogenic systems including the continued fabrication of the baseline refrigeration system, con...
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In the quarter from January 1 through March 31, 1998 American Superconductor continued to concentrate on tasks in the following areas: cryogenic systems including the continued fabrication of the baseline refrigeration system, conductor fabrication addressing the conductor requirements for the 1,000 HP full pole-sets and specification of the wire for the 5,000 HP motor pole-sets, coil development tasks addressing fabrication and performance issues, and the fabrication of the subcoils for the full pole set and the support structures. This non-proprietary report is a brief summary of progress against the tasks addressed during this reporting period.
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摘要 :
In the quarter from January 1 through March 31, 1998 American Superconductor continued to concentrate on tasks in the following areas: cryogenic systems including the continued fabrication of the baseline refrigeration system, con...
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In the quarter from January 1 through March 31, 1998 American Superconductor continued to concentrate on tasks in the following areas: cryogenic systems including the continued fabrication of the baseline refrigeration system, conductor fabrication addressing the conductor requirements for the 1,000 HP full pole-sets and specification of the wire for the 5,000 HP motor pole-sets, coil development tasks addressing fabrication and performance issues, and the fabrication of the subcoils for the full pole set and the support structures. This non-proprietary report is a brief summary of progress against the tasks addressed during this reporting period.
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This report consists of vugraphs of the presentations at the conference. The conference was divided into the following sessions: (1) First Generation Wire Development: Status and Issues; (2) First Generation Wire in Pre-Commercial...
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This report consists of vugraphs of the presentations at the conference. The conference was divided into the following sessions: (1) First Generation Wire Development: Status and Issues; (2) First Generation Wire in Pre-Commercial Prototypes; (3) Second Generation Wire Development: Private Sector Progress and Issues; (4) Second Generation Wire Development: Federal Laboratories; and (5) Fundamental Research Issues for HTS Wire Development.
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The development and fabrication of a layer-wound, epoxy-impregnated Bi-2223 high-temperature superconducting (HTS) racetrack coil which generates 40,000 ampere-turns of magnetomotive force (MMF) at 25 K is described. The coil was ...
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The development and fabrication of a layer-wound, epoxy-impregnated Bi-2223 high-temperature superconducting (HTS) racetrack coil which generates 40,000 ampere-turns of magnetomotive force (MMF) at 25 K is described. The coil was wound using Ag-sheathed Bi-2223 tape conductor laminated with copper foils for strength enhancement and insulated using a paper-wrap method. After epoxy impregnation, the coil was tested over a range of 16--25 K in a vacuum dewar using a closed-cycle helium refrigeration system. Descriptions of the tape lamination and insulation processing, the coil winding and impregnation, and the experimental test setup are given.
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Twenty-seven presentations are included in viewgraph form for the wire development panel, applications development panel, and thallium workshop. Authors and affiliations are: (wire development panel) Kreoger/Christen (ORNL), Maloz...
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Twenty-seven presentations are included in viewgraph form for the wire development panel, applications development panel, and thallium workshop. Authors and affiliations are: (wire development panel) Kreoger/Christen (ORNL), Malozemoff (American Superconductor Corp.), Blaugher (National Renewable Energy Lab.), Haldar (Intermagnetics), Gray/Lanagan/Eror (ANL), Bickel/Voigt/Roth (Sandia), Tkaczyk (GE), Suenaga (BNL), Willis/Korzekwa/Maley (Los Alamos); (applications development panel) Peterson/Stewart (Los Alamos), Iwasa (BNL), Hull/Nieman (ANL), Murphy/DeGregoria (ORNL), Hazelton (Intermagnetics), Dykhuizen (Sandia); (thallium workshop) Goodrich (NIST), Blaugher (NREL), Roth (Sandia), Holstein (DuPont), Paranthaman (ORNL), and Willis (Los Alamos).
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The performance testing of the large quantities of superconducting cables for SSC magnets is a daunting challenge, at best. In an effort to reduce the quantity of full cable testing required, an investigation is underway to evalua...
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The performance testing of the large quantities of superconducting cables for SSC magnets is a daunting challenge, at best. In an effort to reduce the quantity of full cable testing required, an investigation is underway to evaluate the utility of determining the performance of the SSC cables using extracted strand testing. It is believed that the cable performance can be quite accurately determined by measuring the critical current (I(sub c)) on strand samples removed, at random, from the manufactured cable. These strand measurements are used to derive the cable critical current. The measured critical current (I(sub ce)) are then compared to the virgin strands (I(sub cv)) input into the cable to determine the degradation resulting from the cable fabrication. The advantage of this type of certification is two fold; firstly the manufacturer can certify the performance using existing strand measurement equipment. This allows for a reduction in the lead time between manufacture and delivery of the cable. Secondly, the SSC can perform random sampling, as opposed to 100% cable testing and still maintain adequate visibility into the performance of the cables. The following sections cover the techniques used and the results obtained for measurements of extracted strand I(sub c) (I(sub ce)) and field dependence of I(sub ce) for more than fifty representative cables. The data for another five cables for which full cable I(sub c) values were previously measured at Brookhaven National Laboratory are also presented and compared with full cable I(sub c) results. The details of the full cable measurements performed at BNL are described elsewhere. The SSCL full cable test facility will soon be in routine operation which will allow for precise verification of the validity of extracted strand testing in the determination of I(sub c) in SSC cables.
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