所務公告5

西田靖教授獲得2011年日本文部科學大臣科學技術獎 (2011-04-26)

西田靖教授與他的共同作者在電漿粒子加速的發現與超小型電子加速器的研究, 獲得2011年日本文部科學大臣科學技術獎, 該研究成果不僅在電漿技術應用作出貢獻, 同時也可應用於原子精密量測, 以及放射治療, 血管攝影與癌症治療等醫療技術改善...

平成23年度科学技術分野の文部科学大臣表彰

The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

(1) 科学技術賞 Prizes for Science and Technology

2) 研究部門 Research

Title:

Discovery of Particle Acceleration by Plasma and Investigations on the Ultra-Small Accelerator

Prize winners:

Kazuyoshi Koyama

Project Professor, Graduate School of Engineering, University of Tokyo

Yasushi Nishida

Research Professor, Plasma and Space Science Center, National Cheng Kung University

Mitsuru Uesaka

Professor, Graduate School of Engineering, University of Tokyo

Major achievements:

The conventional electron accelerators which employ microwave and metal waveguides have limitation on maximum acceleration gradient by the physical reasons. Therefore, multiple acceleration and beam-focusing with lens between field exciting units are necessarily required in an accelerator in order to accelerate beams to high enough energy. As a result the accelerators become quite large in addition the accelerator requires components with ultra-fine process.

In the present researches, instead of microwave and metal high frequency wave guide, the ultra-short pulse laser excites a wake field which runs almost a speed of light in the plasma for forming the acceleration mechanism. By using laser wake field, we have succeeded to realize an ultra-small accelerator which has an acceleration gradient more than a thousand times larger than conventional accelerators have and also has electron bunches with femto-second length.

By the present results of investigation, we have also succeeded to show mono-energy electron bunch for the first time in the laser acceleration fields. Also we succeeded to show for the first time that the electron bunches accelerated by the present new acceleration system localize in quite short time duration of several 10 femto-second and electron particle numbers in a localized bunch are almost the same or even larger than that the conventional accelerator has.

The present results will realize, on the table-top with almost 2 m squares, the X-ray source with variable wave length and good directionality which was only realized so far with large facilities. This new accelerator will contribute to radiation treatments which are another key application fields of atomic engineering, such as clarification of ultra-high speed phenomena, precise analysis of atoms, photographs on blood vessels with precise and good contrast, cancer treatment and others.

參考連結：http://www.mext.go.jp/b_menu/houdou/23/04/1304367.htm

| 附件: 2011_Prize_from_MEXT.pdf.pdf