Application of High &lt;i&gt;T&lt;/i&gt;&lt;sub&gt;c&lt;/sub&gt; Superconductor in Accelerators: Status and Prospects

Ballarino, A.

doi:10.2221/jcsj.44.411

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…For large currents parallel tapes are required; some transposition could be achieved by winding tapes helically on a cylinder. For an operating temperature of 4.5 K, chosen to enable a fair comparison with Nb-Ti, the can be taken to be (assuming a favorably aligned field of 3 T or less) [7]. Applying values of , and that are dominated by the large Ag-5Au fraction, and , gives .…”

Section: B Cuprates 1) Bi-2223 In a Silver-gold Matrixmentioning

confidence: 99%

“…2) Bi-2212: This material has better current-carrying characteristics than Bi-2223 at 4.5 K [7]. Other advantages are that it can be made in the form of multi-filamentary wire that can be cabled, and it is not sensitive to the direction of magnetic field.…”

Section: B Cuprates 1) Bi-2223 In a Silver-gold Matrixmentioning

confidence: 99%

“…For comparison with the other materials we assume operation at 4.5 K in a magnetic field of 3 T parallel to the broad side. For a typical tape structure having stainless steel substrate and cupronickel in place of stabilizing copper, [7]. With average [8], and and given by averaging values for tape components, we get (with ).…”

Section: ) Ybcomentioning

confidence: 99%

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Scaling of Superconducting Switches for Extraction of Magnetic Energy

Ballarino

Taylor

2010

IEEE Trans. Appl. Supercond.

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Abstract-In certain cases it is necessary to extract the energy from a superconducting magnet when it quenches, in order to limit the heat generated by the event and thus prevent irreversible damage. This is usually achieved by opening a contact breaker across a resistor in the circuit feeding the magnet. For the heavy currents used to excite large magnets such switches incorporate sophisticated devices to limit arcing during the operation; the devices are reliable but are also bulky and expensive. It is interesting to consider the use of superconducting switches to perform this function, an important advantage being that they would be housed in the cryogenic environment of the magnet, and thus avoid permanent diversion of the current in and out of that environment to the mechanical switch (which operates at room temperature). However, practical switches for such an application are made up of superconductor in a metal matrix, and it is convenient to work with a relatively low resistance to approximate to the open circuit. This leads to scaling laws for superconducting switches for this application which relate the operating current and stored energy of the magnet system, the type of superconductor, and the necessary size of the device.

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Section: B Cuprates 1) Bi-2223 In a Silver-gold Matrixmentioning

confidence: 99%

Section: B Cuprates 1) Bi-2223 In a Silver-gold Matrixmentioning

confidence: 99%

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Scaling of Superconducting Switches for Extraction of Magnetic Energy

Ballarino

Taylor

2010

IEEE Trans. Appl. Supercond.

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“…MgB 2 can be manufactured in the form of a tape or round conductor, thus allowing several cabling possibilities [29][30][31]. Possibilities for cabling Bi-based superconductors must not be forgotten either [32] as these are also candidates for high field or high temperature applications [33,34]. Additionally, all these conductors offer a wide variety of aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

On the role of a tape’s aspect ratio in the hysteresis losses of round superconducting cables

Stenvall

Grilli

Vojenčiak

2011

Supercond. Sci. Technol.

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Individual superconductors are made small to allow flexible manufacturing and low AC losses. When high currents are needed, several conductors are cabled together. These cables can be used to wind magnets or to transmit huge currents in electric power lines with very low losses. In DC use, the superconductor in these cables is lossless, but when the current or external magnetic field varies, AC losses arise in the cables. If a round cable is made of several flat tapes, the aspect ratio of the tape (α = width/thickness) plays an important role in the AC losses. Tapes with high α should be put as close to each other as possible in order to form a superconducting cylinder to reduce the hysteresis losses. However, if α is around 10, it is no longer evident what kind of configuration results in the lowest losses. When α approaches 1, the minimum losses are reached when the tapes do not interact at all. YBCO coated conductors have high α, but Bi-based conductors and MgB2 should not be forgotten. These can offer completely different values of α and thus show different behaviours under AC conditions. In this paper we study how the hysteresis losses of round cables are influenced by the tapes’ aspect ratios. We investigate whether it is beneficial to pack the conductors tightly together or to let them operate individually, or whether an intermediate state is preferred. According to the results, there is a break-even α where the tight packing surpasses the individual operation, but the intermediate positioning can result in even lower losses in some cases.

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Scientific Research in the Field of Mesh Method Based Modeling of AC Losses in Superconductors: A Review

Lahtinen

Stenvall

2013

J Supercond Nov Magn

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Application of High <i>T</i><sub>c</sub> Superconductor in Accelerators: Status and Prospects

Cited by 3 publications

References 29 publications

Scaling of Superconducting Switches for Extraction of Magnetic Energy

Scaling of Superconducting Switches for Extraction of Magnetic Energy

On the role of a tape’s aspect ratio in the hysteresis losses of round superconducting cables

Scientific Research in the Field of Mesh Method Based Modeling of AC Losses in Superconductors: A Review

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