visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-06-14 15:00 
일시 June 14, 2016 (Tue) 3PM 
장소 #1323 (E6-2 1st fl.) 
연사 Prof. Seungyong Hahn, Florida State University 

No-Insulation High Temperature Superconductor Magnet Technology for Compact, Reliable, and Low-Cost High Field DC Magnets

 

June 14, 2016 (Tue) 3PM , #1323 (E6-2 1st fl.)
Prof. Seungyong Hahn, Florida State University


Abstract:


Firstly introduced in 2010, the No-Insulation (NI) high temperature superconductor (HTS) winding technique is expected to provide a practical solution for protection of HTS magnets, one of the most critical challenges in high-field (>20-T) HTS magnets. The key idea is to eliminate turn-to-turn insulation within an HTS coil and, in a quench event, current can be automatically diverted to the adjacent turns through turn-to-turn shorts. As a result, an NI magnet can be designed at a substantially higher operating current density than that of its insulated counterpart, thus the magnet becomes extremely compact, yet “self-protecting.” To date, over 100 NI HTS coils have been constructed and tested to have successfully demonstrated the self-protecting feature of NI coils. In a magnet level, a total of 9 NI magnets have been designed, constructed, and tested, including the recent 26-T 35-mm all-REBCO magnet that was designed by Hahn and constructed by SuNAM. To date, all of NI magnets survived after multiple consecutive quenches at their nominal operating temperature ranged 4.2 – 20 K. An NI magnet, however, has a major drawback of “charging delay” due to its turn-to-turn shorts. Several variations of the NI technique, including the Partial-No-Insulation (PNI) and the Metallic-Cladding-Insulation (MCI), are proposed by several groups, with which 5 – 50 times reduced charging delays were reported than those of their NI counterparts. This presentation provides a summary of the NI magnet technologies, relevant to design and construction of axion detection magnets, for the past 5 years, which include: 1) recent quench test results of two all-REBCO magnets, 26-T/35-mm and 7-T/78-mm; 2) a 9 T REBCO insert that reached a record high field of 40 T in a background field of 31 T; 3) “electromagnetic quench propagation” as the self-protecting mechanism of an NI magnet; 4) potential of the NI technique for the next-generation ultra high field magnets; 5) major challenges and potential pitfalls. 


Contact: CAPP Administration Office(T.8166)

번호 날짜 장소 제목
526 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
525 2019-03-21 16:00  RM. 1323, E6-2  Spring 2019: Physics Seminar Serises file
524 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
523 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
522 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
521 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
520 2023-09-18 11:00  E6-2, #1322  Magic polarisation trapping of polar molecules for tunable dipolar interactions file
519 2023-04-04 16:00  Room 2501, KAIST Natural Sciences Lecture Hall(E6)  Chiral Magnetism: A Geometric Perspective
518 2023-11-15 16:00  E6-6, #119  Quantum hydrodynamic theory for plasmonics: from molecule-coupling to nonlinear optics
517 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
516 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
515 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
514 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
513 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
512 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
511 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
510 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
509 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
508 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
507 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4