Basic Researches on Plasma Physics and Particle Acceleration-Radiation Source under the Ultra High Electric Meld.

本项目主要研究非线性物理，特别是高能粒子的加速和超短脉冲、太瓦激光与等离子体相互作用产生的超高电场下的太赫兹辐射。在调研的过程中，我们发现了一些在项目开始时没有预料到的新现象，这些现象也与主项目并行进行了调研。典型结果如下：在钛蓝宝石太瓦激光与弱磁化等离子体的相互作用中，发现了几个10ghz范围和太赫兹范围的辐射现象，并阐明了它们的辐射机制。利用计算机模拟技术，研究了激光与薄膜相互作用中的质子加速机理，阐明了质子束的产生和激光与质子束之间能量交换的机理。更成功地实现了放电产生的毛细管等离子体中的激光分级，阐明了激光分级的引导机理。激光束的等离子体通道是制备基于等离子体的高能粒子加速器的关键方法之一，如我们实验室发现的VpxB加速和其他加速方法。为了构建高效的紧凑型质子加速器，需要紧凑型质子束注入器。为了满足这一要求，我们建造了最大能量高达1 MeV的IH（Interdigital H-mode）线性质子加速器。然而，最大能量未能达到目标。需要进一步的调试和实验工作。该方法对离子的加速效率比传统的加速器高得多。在研究的过程中，意外地发现了等离子体的新应用方法。从碳氢化合物（如甲烷或乙烯）中分离氢的新方法具有很高的效率。在分离过程中，碳原子可以同时生成纳米管。在YBCO超导体地层中，阐明了调试方法。在常压下利用水中的排放物，找到了一种给水灭菌的新方法。少

The present project concerns the investigation of nonlinear physics, specifically the acceleration of high energy particles and the terahertz rang of radiation under ultrahigh electric field produced by ultra-short pulse, terawatt range laser interacting with plasma. In the way of investigation, we found new phenomena which were unexpected when we started the project, and those phenomena were also investigated in parallel with the main project. Typical results follow ;1.In the interaction of Ti-sapphire terawatt range laser with weakly magnetized plasma, radiation phenomena hi several 10 GHz range are found as well as terahertz range, and their radiation mechanisms are clarified.2.By using computer simulation techniques, the proton acceleration mechanism in the interaction between the laser and thin foil are investigated to clarify the mechanisms of proton beam production and energy exchange from laser to proton beam.3.The laser grading in the capillary plasma produced by discharge is … More successfully realized to clarify the guiding mechanisms. The plasma channeling of laser beam is one of the key method of producing the plasma based high energy particle accelerators, such as VpxB acceleration found in our laboratory and other acceleration methods.4.For building the high efficient compact proton accelerator, a compact proton beam injector is required. In order for satisfying this request, we built IH(Interdigital H-mode) linear proton accelerator which has the maximum energy up to 1 MeV. The maximum energy, however, could not reach the target. Further commissioning and the experimental works are required. This IH method has much higher efficiency than the conventional accelerator for accelerating ions.5.New application methods of plasma were found unexpectedly in the way of investigations. New hydrogen detachment method from hydrocarbons, such as methane or ethylene, was found to have quite high efficiency. Carbons in this method make nano-tubes at the same time while detachment is going on. In the YBCO superconductor formation, the commissioning method is clarified. New method of sterilization of water is found by using discharges in the water under atmospheric pressure. Less