A HTS scanning magnet and AC operation

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 616; no. 1; pp. 16 - 20
• Main Authors: Hatanaka, K., Nakagawa, J., Fukuda, M., Yorita, T., Saito, T., Sakemi, Y., Kawaguchi, T., Noda, K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21-04-2010
• Subjects: AC power loss; Air conditioning; DC and AC operations; Detectors; Direct current; High temperature superconducting magnet; Hysteresis; Mathematical models; Scanning; Spectrometers; Wire; High temperature superconducting magnet; AC power loss; DC and AC operations
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2010.02.068

A scanning magnet using high-temperature superconductor (HTS) wire was designed, built, and tested for its suitability as a beam scanner. After successful cooling tests, the magnet performance was studied using DC and AC currents. With DC current the magnet was successfully operated to generate designed field distributions and effective length. In AC mode, the magnet was operated at frequencies of 30–59
Hz and a temperature of 77
K as well as 10–20
Hz and 20
K. The power losses dissipated in the coils were measured and compared with the model calculations. The observed losses per cycle were independent of the frequency and the scaling law of the transport current was consistent with theoretical predictions for hysteretic losses in HTS wires.