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武田 全康; 山崎 大; 曽山 和彦; 鳥飼 直也*
no journal, ,
反射率法は、一般に鏡面あるいはそれに近い表面を持つ物質の厚さ方向に対する数nmから数百nmのスケールの構造変化を非破壊的に調べることのできる測定手段である。反射率法で得られる情報は物質内部に埋もれた界面の構造を含むので、本質的に多層膜構造を持つ磁気デバイスの内部磁気構造や高分子フィルムや生体膜などの構造を非破壊的に測定する手段として、中性子反射率計は理想的な装置である。現在、国内ではつくばの高エネルギー加速器研究機構のパルス中性子源(KENS)に設置されたPORE, ARISAと原子力機構のJRR-3に設置されているLTAS, MINEの計4台の中性子反射率計が稼働中である。しかし、LTASとMINEは反射率計としての稼働時間は少なく、来年(2006年)の3月末でKENSがその使命を終えた後、国内で、常時利用者に開放される中性子反射率計が、実質的に国内には存在しなくなる。そのような中で、来年度初めの本格的な稼働を目指し、現在、JRR-3のC2-2ビームポートに中性子反射率計の整備が進められている。その一方で、JRR-3に目と鼻の先にあるJ-PARCでも水平型中性子反射率計の建設も平行して進められている。本講演では、POREの基本性能を基準とし、JRR-3とJ-PARCの2台の反射率計の性能を見積もり、JRR-3とJ-PARCに設置される反射率計を今後どのように有効利用していくかについての提案を行う。
廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 及川 健一; Su, Y. H.; 甲斐 哲也; 鬼柳 善明*
no journal, ,
We have been developing a magnetic imaging technique using pulsed polarized neutrons at the Materials and Life Science Experimental Facility (MLF) of J-PARC. To apply this method to the direct observation of the magnetic field of an operating industrial product, e.g. electric motors, electric transformers, etc., we constructed the polarization analysis system for neutron imaging and performed some application studies at BL10 NOBORU and BL22 RADEN. In this presentation, we will describe the present status of our polarized neutron imaging method and show some experimental results, including the imaging of the magnetic field of a rotating electric motor, visualization of the leaked magnetic field from a small electric transformer and observation of the magnetic domains in a grain-oriented electric steel.
梶本 亮一
no journal, ,
4SEASONS is a time-of-flight direct geometry chopper spectrometer in the Materials and Life Science Experimental Facility (MLF) at J-PARC. It is designed for measurements of dynamics in the 10
-10
meV energy range. 4SEASONS was originally designed to meet the requirements for studies of high-
oxide superconductors. Indeed, the scientific research activities have been led by studies on copper oxide superconductors, which were followed by studies on iron-based superconductors. In addition, other magnetic materials such as frustrated magnets and multiferroics are also important research themes on 4SEASONS. Including these materials, the field of magnetism and strongly correlated electron systems dominate 80% of the experiment proposals. In the present talk, I will give a brief introduction about the instrument and show recent examples of scientific outputs in this research field.
武田 全康
no journal, ,
The large earthquake hit JRR-3 on Mar 11, 2011. JRR-3 itself had no serious damage, but we had to repair the utilities which is necessary for safety operation. We finished the repair and confirmation of the safe operation of JRR-3 within two years after the earthquake. But because of the tragic nuclear accident of Fukushima Dai-ichi Nuclear Power Plant, the new regulatory requirement was established even for research reactors including JRR-3. We submitted an application document for restarting almost three years ago. But, it has been passed almost 6 years since the earthquake. We are still waiting for the license. The reviewing process now at last moved to the final stage. JAEA officially announced a schedule for restarting of JRR-3 in June last year. In this schedule, the reactor was expected to restart in February, 2018. Unfortunately, the schedule has to be reconsidered based on the delay of reviewing process. The revised schedule will be announced soon.