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Guide cone fast ignition basic physics research

Author: XiongJun
Tutor: WangShiJi
School: Chinese Academy of Engineering Physics
Course: Plasma Physics
Keywords: Fast Ignition Kim cone target Hot electrons Electron spectroscopy Electron angular distribution
CLC: TL61
Type: Master's thesis
Year: 2006
Downloads: 102
Quote: 0
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Abstract


Inertial confinement fusion is an ideal way to get clean fusion energy. Laser drive energy center ignition requires very difficult to meet the requirements of the current technical conditions. Therefore, in order to reduce the amount of driving energy, the use of ultra-short laser pulses \Is the central idea of ​​the compression ignition separate high density compressed implosion by the usual process of thermonuclear fuel, while the ignition conditions of the hot spot is incident from the outside is formed by the relativistic intensity laser. Significant savings for the idea of ​​a laser driven implosion energy, and also relax the requirements of the control fluid mechanics interface instability. One of the key issues in the fast ignition laser energy into hot electrons and transmitted to the bull's-eye. Pellet exists around hundreds of microns long coronal plasma, will make the incident laser beam is split into filaments or instability excitation various parameters of the laser in the transmission process and a large part of the energy absorbed by the coronal region, only a small partially converted into the energy of hot electrons. Over the past decade, researchers have proposed a variety of ignition the idea, which the guide cone fast ignition scheme has the following advantages: the ignition pulse direct incoming high density areas; reduce the laser corona of the various plasma interaction instability impact; oriented focus ignition laser, the laser energy deposition in the hot spot areas. However, the details are not yet clear, laser guide cone plasma interaction through basic research, in-depth understanding of bevel guide focusing effect and how to improve the ignition beneficial number of hot electrons. The paper first a brief introduction of the concept of inertial confinement fusion center ignition and the basic principles of fast ignition. The second chapter briefly describes the various fast ignition scheme, Section II highlights the the internationally oriented cone ignition research program and progress. The generation and transport of hot electrons in fast ignition focus of attention in the physical characteristics of the hot electrons generated mechanism has important implications, so third chapter focuses on a variety of hot electrons generated mechanism. Chapter experiment to introduce their work - Golden cone facing away from the target to produce hot electrons. Using the power density of from 10 18 the Wcm -2 picosecond laser irradiation Gold Cone target, measured prior to distribution to the whole space (the target headed in opposite directions) of hot electrons and spectroscopy. Compared with the gold foil target of the plane under the same experimental conditions, the experimental results showed that, the conical target conditions under target backward generated hot electrons in a substantial increase of around 2 ~ 2.5MeV that tapered target hot electrons generation has important implications: 30 o gold cone target significantly improve the the suprathermal electron yield after the target, indirectly confirmed the conical target oriented focus on the short-pulse laser; experiment found that, under the conditions of the conical target target space divergence angle facing away from the hot electrons is greater than the planar target. After preliminary analysis, this may be the impact because the chirped pulse amplification laser inherent the pre plasma generated by the higher pulse edge; 15 O conical target case, the measured electron dose far below the plane target. Analyze the reasons may have two points: First, the pulse edge noise generated by the pre-plasma outward expansion, making the interaction region in the defocus position. The second is a long distance to target transport of hot electron transport, a large amount of energy loss through collisions and electric field block. Chapter simple text to conclude Looking forward to the follow-up experiments.

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