Design and results of a YBCO magnet for a 95 GHz gyrotron application

Earle E. Burkhardt; D. Michael Coffey; Adam Berryhill; R. Wayne McGhee

doi:10.1109/TASC.2009.2019549

Design and results of a YBCO magnet for a 95 GHz gyrotron application

Earle E. Burkhardt, D. Michael Coffey, Adam Berryhill, R. Wayne McGhee

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The use of high-temperature superconductors (HTS) for cryogen-free gyrotron magnets will greatly reduce the power requirement and overall physical size of the system. Because some gy- rotron systems are mounted on a vehicle and need to be mobile, the refrigeration system must be as lightweight and compact as possible. Cryomagnetics previously built a BSCCO magnet based on the design of a NbTi magnet. The limiting factors with this magnet were the cost of the BSCCO material and the excessive weight due to the necessity of field-shaping iron. Since it is projected that the cost of 2G YBCO tape will become significantly lower than BSCCO, and the critical current will also increase, the next generation of these magnets will mitigate those problems. The first objective was to study quench behavior in HTS coils. Cryomagnetics has also designed, built and successfully tested a 3.57 T magnet wound with 2G YBCO tape. This is the first full-scale magnet of its kind built using 2G YBCO tape. It consists of 10 double-pancakes operating at 140 A and 20 K. A single-stage cryocooler is used to cool the magnet. Because the performance of YBCO material is improving quickly, future magnets will be able to operate at lower current, higher temperature and will be lighter weight.

Original language	English
Article number	5109568
Pages (from-to)	2198-2201
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	19
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2009.2019549
State	Published - Jun 2009
Externally published	Yes

Funding

Manuscript received August 26, 2008. First published June 23, 2009; current version published July 15, 2009. This work was supported in part by the Air Force Research Laboratory (AFRL), Propulsion Directorate, under Contract FA8650-05-C-2625. The authors are with Cryomagnetics, Inc., Oak Ridge, TN 37830 USA (e-mail: [email protected]). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2009.2019549 Fig. 1. YBCO test coil used to study quench behavior. Wires with dark tab are current leads for foil heater. Tabs at the top are connected to the start and finish of the YBCO.

Funders	Funder number
Air Force Research Laboratory	FA8650-05-C-2625

Keywords

Gyrotrons
HTS quench behavior
High-temperature superconductors
Superconducting magnets

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10.1109/TASC.2009.2019549

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abstract = "The use of high-temperature superconductors (HTS) for cryogen-free gyrotron magnets will greatly reduce the power requirement and overall physical size of the system. Because some gy- rotron systems are mounted on a vehicle and need to be mobile, the refrigeration system must be as lightweight and compact as possible. Cryomagnetics previously built a BSCCO magnet based on the design of a NbTi magnet. The limiting factors with this magnet were the cost of the BSCCO material and the excessive weight due to the necessity of field-shaping iron. Since it is projected that the cost of 2G YBCO tape will become significantly lower than BSCCO, and the critical current will also increase, the next generation of these magnets will mitigate those problems. The first objective was to study quench behavior in HTS coils. Cryomagnetics has also designed, built and successfully tested a 3.57 T magnet wound with 2G YBCO tape. This is the first full-scale magnet of its kind built using 2G YBCO tape. It consists of 10 double-pancakes operating at 140 A and 20 K. A single-stage cryocooler is used to cool the magnet. Because the performance of YBCO material is improving quickly, future magnets will be able to operate at lower current, higher temperature and will be lighter weight.",

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Design and results of a YBCO magnet for a 95 GHz gyrotron application

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