Book

Yukikazu Iwasa and Seungyong Hahn, a chapter, Magnets on NMR and MRI, in Handbook on Applied Superconductivity, V. Seidel, Ed., to be published by Wiley-VCH, Weinheim, Germany, in 2013.

Yukikazu Iwasa, Case Studies in Superconducting Magnets 2nd Ed. (Springer, 2009). Yukikazu Iwasa, Case Studies in Superconducting Magnets (Plenum Press, New York, 1994)

Y. Iwasa and D. B. Montgomery, a chapter, Superconducting Magnets, in Applications of Superconductivity, V.L. Newhouse, Ed., (Academic Press, New York, 1975).

Refereed Journal Papers

1. Yukikazu Iwasa, Seungyong Hahn, John Voccio, Dong Keun Park, Youngjae Kim, and Juan Bascuñán, “Persistent-mode high-temperature superconductor shim coils: a design concept and experimental results of a prototype Z 1 high-temperature su- perconductor shim,” Appl. Phys. Lett. 103, 000000(3) (2013).
   
   
2. OJ Kwon, KL Kim, YH Choi, HJ Shin S Hahn, Y Iwasa and HG Lee, “Effects of turn-to-turn compactness in the straight sections of HTS racetrack coils on thermal and electrical characteristics,” Supercond. Sci. Technol. 26, 085025(7) (2013).
   
   
3. Juan Bascuñán, Seungyong Hahn, Youngjae Kim, and Yukikazu Iwasa, “A new high- temperature superconducting (HTS) 700-MHz insert magnet for a 1.3-GHz LTS/HTS NMR magnet,” IEEE Trans. Appl. Superconduc. 23, 4400304(4) (2013).
   
   
4. Hyun-Jin Shin, Kwang Lok Kim, Yoon Hyuck Choi, Oh Jun Kwon, Seungyong Hahn, and Yukikazu Iwasa, H.G. Lee, “Effects of Impregnating Materials on Thermal and Electrical Stabilities of the HTS Racetrack Pancake Coils Without Turn-to-Turn Insulation,” IEEE Trans. Appl. Superconduc. 23, 7700404(4) (2013).
   
   
5. Seungyong Hahn, Youngjae Kim, John Voccio, Dong Keun Park, Blair Gagnon, Juan Bascuñán, Masaru Tomita, and Yukikazu Iwasa, “Bulk and plate annulus stacks for compact NMR magnets: trapped field characteristics and shimming hysteresis,” IEEE Trans. Appl. Superconduc. 23, 4300504(4) (2013).
   
   
6. Jiayin Ling, John Voccio, Youngjae Kim, Seungyong Hahn, Juan Bascuñán, Dong keun Park, and Yukikazu Iwasa, “Monofilament MgB2 wire for a Whole-body MRI magnet: superconducting joints and test coils,” IEEE Trans. Appl. Superconduc. 23, 6200304(4) (2013).
   
   
7. Youngjae Kim, Juan Bascuñán, Thibault Lecrevisse, Seungyong Hahn, John Voc- cio, Dongkeun Park, and Yukikazu Iwasa, “YBCO and Bi2223 coils for high field LTS/HTS NMR magnets: HTS-HTS joint resistivity,” IEEE Trans. Appl. Supercon- duc. 23, 6800704(4) (2013).
   
   
8. Seungyong Hahn, Youngjae Kim, Jiayin Ling, John Voccio, Dongkeun Park, Juan Bascuñán, Hyun-Jin Shin, Haigun Lee, and Yukikazu Iwasa, “No-insulation coil under time-varying conditions: charging delay and magnetic coupling,” IEEE Trans. Appl. Supercond. 23, 4601705(4) (2013).
   
   
9. John Voccio, Seungyong Hahn, Dongkeun Park, Iayin Ling, Youngjae Kim, Juan Bascuñán, and Yukikazu Iwasa, “Magic-angle spinning NMR magnet development: field analysis and prototypes,” IEEE Trans. Appl. Superconduc. 23, 4300804(4) (2013).
   
   
10. Xudong Wang, Seungyong Hahn, YoungJae Kim, Juan Bascuñán, John Voccio, Haigun Lee, and Yukikazu Iwasa, “Turn-to-turn contact characteristics for equivalent circuit model of no-insulation ReBCO pancake coil,” Supercond. Sci. Technol. 26, 035012(6) (2013).
    
    
11. Blair Gagnon, Seungyong Hahn, Dong Keun Park, John Voccio, Kwangmin Kim, Juan Bascuñán, and Yukikazu Iwasa, “Field performance of a prototype compact YBCO annulus magnet for micro-NMR spectroscopy,” Physica C: Superconductivity 486, 26(5) (2013).
    
    
12. Yukikazu Iwasa, “Personal Recollection (1961–1967)—My Encounter with and Work on Flux Jumping,” Forum on Superconductivity Science and Technology News (FSST News) 134, 4 (2012).
    
    
13. S.B. Kim, T. Kimoto, Y. Yano, S. Hahn, and Y. Iwasa, “Numerical and experimental study to fabricate the new type compact NMR device using stacked HTS bulks,” IEEE Trans. Appl. Superconduc. 22, 4302004 (2012).
    
    
14. Juan Bascuñán, Seungyong Hahn, Dong Keun Park, Youngjae Kim, and Yukikazu Iwasa, “On the 600 MHz HTS insert for a 1.3 GHz NMR magnet,” IEEE Trans. Appl. Superconduc. 22, 4302104 (2012).
    
    
15. Seungyong Hahn, John Voccio, Dong Keun Park, Kwang-Min Kim, Masaru Tomita, Juan Bascuñán, and Yukikazu Iwasa, “A stack of YBCO annuli, thin plate and bulk, for micro-NMR spectroscopy,” IEEE Trans. Appl. Superconduc. 22, 4302204 (2012).
    
    
16. Seungyong Hahn, Dong Keun Park, John Voccio, Juan Bas-cun˜a´n, and Yukikazu Iwasa, “No-Insulation (NI) HTS inserts for > 1GHz LTS/HTS NMR Magnets,” IEEE Trans. Appl. Superconduc. 22, 4302405 (2012).
    
    
17. Dong Keun Park, Jiayin Ling, Matt Rindfleisch, John Voccio, Seungyong Hahn, Juan Bascuñán, Michael Tomsic, and Yukikazu Iwasa, “MgB2 for MRI magnets: test coils and superconducting joints results,” IEEE Trans. Appl. Superconduc. 22, 4400305 (2012).
    
    
18. Seungyong Hahn, Dong Keun Park, Kwangmin Kim, Juan Bascuñán, and Yukikazu Iwasa, “No-Insulation (NI) winding techniques for premature-quench-free NbTi MRI magnets,” IEEE Trans. Appl. Superconduc. 22, 4501004 (2012).
    
    
19. Seungyong Hahn, Dong Keun Park, Juan Bascuñán, and Yukikazu Iwasa, “HTS pancake coils without turn-to-turn insulation,” IEEE Trans. Appl. Superconduc. 21, 1592 (2011).
    
    
20. Seungyong Hahn, John Voccio, Ste´ephane Bermond, Dong Keun Park, Juan Bas- cun˜a´n, Seok Beom Kim, Masaru Tomita, and Yukikazu Iwasa, “Field Performance of an Optimized Stack of YBCO Annuli for a Compact NMR Magnet,” IEEE Trans. Appl. Superconduc. 21, 1632 (2011).
    
    
21. Juan Bascuñán, Seungyong Hahn, Dong Keun Park, and Yukikazu Iwasa, “A 1.3- GHz LTS/HTS NMR magnet—a progress report,” IEEE Trans. Appl. Superconduc. 21, 2092 (2011).
    
    
22. Dong Keun Park, Seungyong Hahn, Juan Bascuñán, and Yukikazu Iwasa, “Active protection of an MgB2 test coil,” IEEE Trans. Appl. Superconduc. 21, 2402 (2011).
    
    
23. Yukikazu Iwasa, Juan Bascuñán, Seungyong Hahn, Masaru Tomita, and Weijun Yao, “High-Temperature Superconducting Magnets for NMR and MRI: R&D Activities at the MIT Francis Bitter Magnet Laboratory,” IEEE Trans. Appl. Superconduc. 20, 718 (2010).
    
    
24. Weijun Yao, Juan Bascuñán, Seungyong Hahn, and Yukikazu Iwasa, “MgB2 coil for MRI applications,” IEEE Trans. Appl. Superconduc. 20, 756 (2010).
    
    
25. Seungyong Hahn, Seok Beom Kim, Min Cheol Ahn, John Voccio, Juan Bascuñán, and Yukikazu Iwasa, “Trapped field characteristics of stacked YBCO thin plates for compact NMR magnets: spatial field distribution and temporal stability,” IEEE Trans. Appl. Superconduc. 20, 1037 (2010).
    
    
26. Seungyong Hahn, Juan Bascuñán, Weijun Yao, and Yukikazu Iwasa, “Two HTS Options for a 600 MHz Insert of a 1.3 GHz LTS/HTS NMR Magnet: YBCO and BSCCO,” Physica C: Superconductivity 470, 1721 (2010).
    
    
27. J. Bascuñán, S. Hahn, M. Ahn and Y. Iwasa, “Construction and test of a 500 MHz/200 mm RT bore solid cryogen cooled Nb3 Sn MRI magnet,” Adv. Cryogenic Tech. (2010).
    
    
28. Seung-yong Hahn, Juan Bascuñán, Haigun Lee, Emanuel S. Bobrov, Wooseok Kim, Min Cheol Ahn, and Yukikazu Iwasa, “Operation and performance analyses of 350 and 700 MHz low-/high-temperature superconductor nuclear magnetic resonance magnets: A march toward operating frequencies above 1 GHz,” J. Appl. Phys. 105, 024501 (2009).
    
    
29. Weijun Yao, Juan Bascuñán, Seungyong Hahn, and Yukikazu Iwasa, “A superconducting joint technique for MgB2 round wires,” IEEE Tran. Appl. Superconduc. 19, 2261 (2009).
    
    
30. Min Cheol Ahn, Tsuyoshi Yagai, Seungyong Hahn, Ryuya Ando, Juan Bascuñán, and Yukikazu Iwasa, “Spatial and temporal variations of a screening current induced magnetic field in a double-pancake HTS insert of an LTS/HTS NMR magnet,” IEEE Tran. Appl. Superconduc. 19, 2269 (2009).
    
    
31. Seung-yong Hahn, Min Cheol Ahn, Emanuel Saul Bobrov, Juan Bascuñán, and Yukikazu Iwasa, “An analytical technique to elucidate field impurities from manufacturing uncertainties of a(n) double pancake type HTS insert for high field LTS/HTS NMR magnets,” IEEE Tran. Appl. Superconduc. 19, 2281 (2009).
    
    
32. Seung-yong Hahn, Min Cheol Ahn, Juan Bascuñán, Weijun Yao, and Yukikazu Iwasa, “Nonlinear behavior of a shim coil in an LTS/HTS NMR magnet with an HTS insert comprising double-pancake HTS-tape coils,” IEEE Tran. Appl. Superconduc. 19, 2285 (2009).
    
    
33. S. Hahn, J. Bascuñán, H. Lee, E.S. Bobrov, W. Kim, and Y. Iwasa, “Development of a 700 MHz low-/high-temperature superconductor for nuclear magnetic resonance magnet: Test results and spatial homogeneity improvement,” Rev. Sci. Instrum. 79, 026105 (2008).
    
    
34. Seung-yong Hahn, Juan Bascuñán, Woo-Seok Kim, Emanuel S. Bobrov, Haigun Lee, and Yukikazu Iwasa, “Field mapping, NMR lineshape, and screening currents induced field analyses for homogeneity improvement in LTS/HTS NMR magnets,” IEEE Tran. Appl. Superconduc. 18, 858 (2008).
    
    
35. Weijun Yao, Juan Bascuñán, Woo-Seok Kim, Seungyong Hahn, Haigun Lee, and Yukikazu Iwasa, “A solid nitrogen cooled MgB2 ‘demonstration’ coil for MRI applications,” IEEE Tran. Appl. Superconduc. 18, 912 (2008).
    
    
36. Woo-Seok Kim, Frederic Trillaud, Min Cheol Ahn, Yukikazu Iwasa, Xuan Peng, and Michael Tomsic, “Normal zone propagation in 2-dimensional YBCO winding pack models,” IEEE Tran. Appl. Superconduc. 18, 1249 (2008).
    
    
37. Frederic Trillaud, Min Cheol Ahn, Juan Bascuñán, Woo-Seok Kim, John Voccio, and Yukikazu Iwasa, “Quench behavior, quench protection of a YBCO test coil assembly,” IEEE Tran. Appl. Superconduc. 18, 1329 (2008).
    
    
38. Woo-Seok Kim, Frederic Trillaud, Min Cheol Ahn, Yukikazu Iwasa, Xuan Peng, and Michael Tomsic, “Detect-and-activate-the-heater protection technique for YBCO coils,” IEEE Tran. Appl. Superconduc. 18, 1337 (2008).