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

本项目涉及非线性物理的研究，特别是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高能粒子的加速和太赫兹辐射。在调查的方式中，我们发现了一些在项目开始时意想不到的新现象，这些现象也是与主体项目平行调查的。主要研究结果如下：1.在钛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10 GHz范围内的辐射现象以及太赫兹辐射现象，并阐明了它们的辐射机理。2.利用计算机模拟技术，研究了激光与薄箔相互作用中的质子加速机制，阐明了激光与质子束相互作用过程中质子产生和能量交换的机制较成功地实现了对导向机制的厘清。激光的等离子体沟道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加速等加速方法。4.为了建造高效紧凑的质子加速器，需要一个紧凑的质子注入器。为了满足这一要求，我们建造了最大能量可达1 MeV的交叉指H模(IH)直线质子加速器。然而，最大能量无法达到目标。还需要进一步的调试和试验工作。这种IH方法比传统的加速器对离子的加速效率要高得多。5.在研究中意外地发现了等离子体的新应用方法。从甲烷或乙烯等碳氢化合物中分离氢气的新方法被发现具有相当高的效率。这种方法中的碳在剥离过程中同时生成纳米管。在YBCO超导体的形成过程中，明确了调试方法。利用常压下水中的放电，发现了一种新的水灭菌方法。较少

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