第8回物理工学科教室談話会[Dr. Boris Maiorov・12/11(月)15:00~16:00]

講 師:Dr. Boris Maiorov
所 属:National High Magnetic Field Laboratory, Los Alamos National Laboratory
題 目:Accessing new frontiers to study unconventional phenomena using pulsed high magnetic fields
日 時:2023 年 12 月 11 日(月)15:00~16:00
Date and Time:December 11, 2023 (Monday) 15:00-16:00
場 所:工 6 号館 3 階セミナー室 A
Place :Seminar Room A, 3rd floor, Engineering Bldg.6

The promise of fusion technology stemming from high magnetic fields produced by coated conductors and recent records in all-superconducting magnets reinforce the need to study critical current density (Jc) in magnetic fields above 30T. Achieving Jc measurements in pulsed magnetic fields provides a tool for this. Using Fast Programmable Gate Array electronics we measured reproducible current–voltage curves (I-V) in different superconductor thin films on single crystals and metal substrates grown by different methods. We show it is possible to measure Jc in high pinning coated conductors up to 65T, if the rapid vortex movement occurring during field pulses is considered to analyze the results. We compare measurements in two of the magnet systems available at Los Alamos Pulsed Field Facility of the National High Magnetic Field Laboratory and show that we are now able to measure Jc continuously as a function of field (H) in our newly commissioned mid-pulse magnet. We determined the window of dH/dt where meaningful data can be obtained (where t is the time). We explore extending Jc determination to higher dH/dt and compare the Jc performance of standard samples and those with nanoparticle additions.

紹介教員:為ヶ井 強 准教授(物理工学専攻)、木村 剛 教授(物理工学専攻)