Photon Acceleration and Its Mechanisms Induced in Plasma by Intense Microwave

强微波等离子体中光子加速及其机制

• 批准号: 08458106
• 负责人: NISHIDA Yasushi
• 金额: $ 5.57万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08458106/
• 关键词: photon acceleration; laser wakefield; blue shift; frequency up-shift; ponderomotive force; plasma accelerator; intense microwave; microwave plasma interaction; プラズマ利用加速器; プラズマ航跡場; ポンデラモ-ティブ力; プラズマダクト; 電子加速; 非線形効果

The task of this project is to clarify the mechanism of the blue-shift or photon acceleration induced in the frequency of electromagnetic wave irradiated to the plasma. This phenomenon was observed originally in our Laboratory in the investigations related to the laser wakefield acceleration which is simulated by the intense microwavw irradiation to the plasma instead of high power, short pulse laser.In the present works, we have observed specifically two kinds of phenomena, the one is followed by ionization induced by a strong microwave and the other is the phenomena observed in the situation where there is no or almost no ionization. In the second case, the strong standing wave existing within the chamber push to move the plasma by a ponderomotive force to create a blue-shift. The Key differences between two cases are that the upper side-band daughter waves with frequencies such as 6-20 MHz have seen clearly observed when there is no ionization. If the ionization are accompanied, these daughter frequency components are not clear, rather broad band spectrums are observed. As an application of the ptesent phenomena, we have shown the possibilities of DC-AC Radiation Conversion (DARC) phenomenon. This is a direct radiation process of ultra-short pulse microwaves from electrostatic fields.

该项目的任务是阐明照射到等离子体的电磁波频率引起的蓝移或光子加速的机制。这种现象最初是在我们实验室在与激光尾场加速相关的研究中观察到的，激光尾场加速是通过对等离子体进行强微波照射而不是高功率、短脉冲激光来模拟的。在目前的工作中，我们具体观察到了两种现象，一种是强微波引起的电离，另一种是在没有或几乎没有电离的情况下观察到的现象。在第二种情况下，腔室内存在的强驻波通过质动力推动等离子体移动，从而产生蓝移。两种情况之间的主要区别在于，当没有电离时，可以清楚地观察到频率为 6-20 MHz 的上边带子波。如果伴随电离，则这些子频率分量不清晰，而是观察到宽带频谱。作为现有现象的应用，我们展示了直流-交流辐射转换（DARC）现象的可能性。这是超短脉冲微波从静电场直接辐射的过程。

项目成果

B.Cros, G.Matthieussent, X.Xu, T.Tsukada, Y.Nishida: "High power EM Pulse propagation in a plasma with addidional ionization" Proc.1996 Int.Conf.Plasma Phys.Ed.by H.Sugai and Y.Hayashi. Vol.1. 934-937 (1996)

B.Cros、G.Matthieussent、X.Xu、T.Tsukada、Y.Nishida：“具有额外电离作用的等离子体中的高功率电磁脉冲传播”Proc.1996 Int.Conf.Plasma Phys.Ed.，作者：H.Sugai 和

B.Cros, et al.: "Ionization-indiced frequency up-shift of a high power microwave interacting with a plasma" Phys.Plasma. 4. 837-2844 (1997)

B.Cros 等人：“高功率微波与等离子体相互作用的电离指示频率上移”Phys.Plasma。

H.Ito, Y.Nishida, and N.Yugami: "Foprmation of plasma Waveguide and Ducting of High Power Microwave in Plasma" J.Plasma and Fusion Reserch. (in print).

H.Ito、Y.Nishida 和 N.Yugami：“等离子体波导的形成和等离子体中高功率微波的输送”J.等离子体与聚变研究。

N.Yugami et al.: "Experimental Observation of Short MicrowaveGeneration via Relativistic Ionization front Produced by CO2 Laser" Jpn.J.Appl.Phys.37. 688-689 (1998)

N.Yugami 等人：“通过 CO2 激光产生的相对论电离前沿对短微波发生的实验观察”Jpn.J.Appl.Phys.37。

Rui Zhang et al.: "New Electrodeless Light Source Intensified by Electron Cyclotron Resonance Heating" Jpn.J.Appl.Phys.37. 349-352 (1998)

Rui Zhang 等人：“通过电子回旋共振加热增强的新型无电极光源”Jpn.J.Appl.Phys.37。