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，特别是超短脉冲太瓦级激光与等离子体相互作用产生的超高压电场作用下高能粒子的加速和太赫兹辐射。在调查中，我们发现了一些新的现象，这些现象是我们在项目开始时没有预料到的，并且这些现象也是与主项目平行调查的。典型结果如下; 1.在钛蓝宝石太瓦激光与弱磁化等离子体相互作用中，发现了几个10 GHz波段和太赫兹波段的辐射现象，并阐明了它们的辐射机理。研究了激光与薄膜相互作用中的质子加速机制，阐明了质子束的产生机制和激光与质子的能量交换机制3.在放电产生的毛细管等离子体中进行激光分级， 关于我们 成功地实现了明确的指导机制。激光束的等离子体沟道效应是产生等离子体基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。4.为了建造高效的紧凑型质子加速器，需要一个紧凑型质子束注入器。为了满足这一要求，我们建立了IH（叉指H模式）线性质子加速器，其最大能量可达1 MeV。然而，最大能量无法到达目标。需要进一步的调试和实验工作。该方法比传统的离子加速器有更高的加速效率。5.在研究中意外地发现了等离子体的新应用方法。从烃类如甲烷或乙烯中分离氢的新方法被发现具有相当高的效率。在YBCO超导体的制备过程中，阐明了调试方法。利用大气压下水中的放电，发现了一种新的水消毒方法。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