scholarly journals Interaction physics of the fast ignitor concept

1997 ◽  
Vol 15 (4) ◽  
pp. 557-564 ◽  
Author(s):  
C. Deutsch ◽  
H. Furukawa ◽  
K. Mima ◽  
M. Murakami ◽  
K. Nishihara
Keyword(s):  
Energy Loss ◽  
Penetration Depth ◽  
Hot Spots ◽  
Ultrafast Lasers ◽  
Langmuir Wave ◽  
Relativistic Electrons ◽  
Wave Excitation ◽  
Fast Ignitor ◽  
Binary Collisions ◽  
Thermonuclear Fuel

The interaction of relativistic electrons produced by ultrafast lasers and focussing them on strongly precompressed thermonuclear fuel is analytically modelled. Energy loss to target electrons is treated through binary collisions and Langmuir wave excitation. The overall penetration depth is determined by quasielastic and multiple scattering on target ions. Thus, it appears possible to ignite efficient hot spots in a target with density larger than 300 g/cc.

ENERGY DEPOSITION OF RELATIVISTIC ELECTRONS IN SUPER-HOT PLASMA

2007 ◽  
Vol 21 (27) ◽  
pp. 1855-1862 ◽  
Author(s):  
TONG-CHENG WU ◽  
XUAN ZHANG ◽  
WEI-KE AN
Keyword(s):  
Electron Beam ◽  
Energy Loss ◽  
Energy Deposition ◽  
Plasma Oscillation ◽  
Lorentz Factor ◽  
Relativistic Electrons ◽  
Exact Relation ◽  
Loss Mechanism ◽  
Electron Collisions ◽  
Thermonuclear Fuel

The intense ultrashort laser interacting with the thermonuclear fuel may produce a relativistic plasma and MeV electron beam, how to fix the Lorentz factors of the particles in the plasma and model the energy deposition of MeV electron beams are important subjects. In this letter, we demonstrate the exact relation between the average Lorentz factor and the temperature of the system; and then obtained the relativistic modified formula for the energy loss of the relativistic electron-beam due to binary electron-electron collisions. Another important energy loss mechanism, the excitation of Langmuir collective plasma oscillation, is also treated within the relativistic framework. Hence, we re-examine theoretically the possibility of igniting hot spots in the super-compressed DT target and the answer is that the fast ignitor scenario is able to yield thermonuclear ignition in the target.

Brechung und Reflexion schneller Elektronen durch dünne Folien

1968 ◽  
Vol 23 (12) ◽  
pp. 1988-1994
Author(s):  
H. Zeidl ◽  
H. Baier
Keyword(s):  
Energy Loss ◽  
Secondary Electron Emission ◽  
Experimental Methods ◽  
Relativistic Electrons ◽  
Angle Of Incidence ◽  
Step Method ◽  
Computational Program ◽  
Thin Foils ◽  
The Monte Carlo Method ◽  
The Mean

The Monte Carlo method is applied to investigate the penetration of fast electron through thin foils of matter. The “step by step method” is used. Energy loss and secondary electron emission are taken into account. As an example for the possible application of the computational program we calculated “refraction” and “reflection” of relativistic electrons on thin Al-foils. Scattering and reflection depends significantly on the energy loss of the electrons in the foil. The “mean scattering angle” of the electron beam (with respect to the foil normal) has been shown to be smaller than the angle of incidence (with respect to the foil normal). Possible experimental methods to test the predictions on mean scattering and reflection angles (as defined in this paper) are discussed.

Ionization Energy Loss of Relativistic Electrons in Thin Silicon Detectors

1978 ◽  
Vol 40 (19) ◽  
pp. 1242-1244 ◽  
Author(s):  
W. Ogle ◽  
P. Goldstone ◽  
C. Gruhn ◽  
C. Maggiore
Keyword(s):  
Energy Loss ◽  
Ionization Energy ◽  
Relativistic Electrons ◽  
Silicon Detectors ◽  
Ionization Energy Loss ◽  
Thin Silicon

scholarly journals Flow-Heat Conjugate Numerical Simulation Based on the Time-Domain Method

2020 ◽  
Vol 38 (2) ◽  
pp. 261-270
Author(s):  
Hongyang Li ◽  
Yun Zheng
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Penetration Depth ◽  
Time Domain ◽  
Time Scale ◽  
Hot Spots ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Flow Heat ◽  
The Time Domain

For the popups of the applicability of the time-domain based unsteady flow-heat coupling numerical simulation method in physical problems with time-period characteristic, the cases of the plate convection heat transfer and the hollow blunt-nosed blade with periodic hot spots were conducted through the internal CFD code namely HGFS. The unsteady results are analysed both in the time——domain and the frequency-domain and the main conclusions are as follows:the numerical simulation results of the plate convection heat transfer indicate that the time-scale of heat convention in the fluid domain is 10-3 s order of magnitude, while that of heat conduction in solid domain is seconds. Thus, the disparity of time scale may lead to a sharp increase in the amount of calculation, and even lead to failure of the calculation method based on time-domain. The unsteady numerical simulation of the simplified turbine blade with hot spots shows that, when the sweep frequency increases to 5 times of the original, the first-order amplitude of the temperature wave in the blade decreases to 50.4%, from 0.343 K to 0.173 K, and the corresponding penetration depth decreases to 42.8%, from 5.21 mm to 2.23 mm. The temperature fluctuation amplitude and penetration depth reduce significantly with the increasing of frequency.

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