Design, Construction, and Test Arrangement of a Fast-Cycling HTS Accelerator Magnet

• Published in: IEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 4
• Main Authors: Piekarz, Henryk, Blowers, Jamie, Hays, Steven, Shiltsev, Vladimir
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-06-2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Accelerators; Applied sciences; Assembly; Cables; Constraining; Construction; Conventional power leads; Cycles; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Electromagnets; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; fast-cycling accelerator magnet; High-temperature superconductors; HTS power cable; Magnetic cores; Magnetic hysteresis; Magnetic separation; Power cables; Power electronics, power supplies; SC cable power losses; Splicing; Superconducting cables; Superconducting magnets; Superconductivity; Various equipment and components; SC cable power losses; Cycling; Power cables; Splice; fast-cycling accelerator magnet; Connection; Power supply; Power electronics; Conventional power leads; Mechanical joint; Proton accelerator; Superconducting magnet; HTS power cable; Power losses; Superconducting cable; Maximum temperature; Accelerator magnets; Transmission loss; High temperature superconductor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2013.2285093

Design, fabrication, and assembly of a novel fast-cycling accelerator magnet is presented. A short-sample magnet is powered with a single-turn HTS cable capable to carry 80-kA current up to a temperature of 20 K. This allows for a (13-15) K margin when using the operational temperature of (5-7) K. The availability of such a wide temperature margin for a fast cycling magnet constitutes the most necessary parameter for prevention and control of the fast-cycling magnet quench. Therefore, the HTS conductors have unsurpassed advantage over the LTS ones for which the maximum temperature margin is typically 2 K. The maximum possible generated field in the 40-mm test magnet gap is 1.75 T. The applied conventional leads and the power supply, however, allow only for the sin-wave 24-kA current of 20-Hz repetition rate, thus limiting magnet tests to the B-field of 0.5 T with a maximum cycling rate of 20 T/s. The critical aspects of cable construction and the splicing connection to the power leads are described. Tentative power losses of the proposed HTS-based accelerator magnet in possible applications for the proton and muon accelerators are presented.