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🔥 Content Introduction
In the field of directed electromagnetic emission technology, microthermal residuals are a key issue of great concern, closely related to the performance, stability, and lifespan of the system. Understanding the phenomenon of microthermal residuals and the underlying physical mechanisms is crucial for optimizing the design and operation of directed electromagnetic emission systems.
Directed electromagnetic emission is a technology that uses electromagnetic forces to launch objects at high speeds, demonstrating great potential in military applications (such as electromagnetic railguns launching projectiles) and aerospace (electromagnetic catapults assisting spacecraft launches). During the launch process, strong currents pass through the conductors of the launching device, generating Joule heat. Although the launch time is extremely short, the instantaneous release of high energy still leaves microthermal residuals in the conductors and surrounding materials.
From a physical principle perspective, when current flows through a conductor, electrons collide with lattice atoms, converting electrical energy into thermal energy. In directed electromagnetic emissions, the high current density makes this energy conversion extremely intense. For example, in an electromagnetic railgun, the current density between the rails and the armature can reach thousands of amperes per square centimeter or even higher. Such high current density causes the surface of the rails to heat up rapidly, and even after the launch is completed, a certain amount of heat remains in the interior and nearby areas of the rails, which is the source of microthermal residuals.
Microthermal residuals have various impacts on directed electromagnetic emission systems. Firstly, they can affect the material properties of the launching device. Continuous accumulation of microthermal residuals may lead to changes in the metallographic structure of the materials, such as grain growth and increased dislocation density in metallic materials, thereby reducing the strength and hardness of the materials and shortening the lifespan of the launching device. Secondly, microthermal residuals can affect the accuracy of subsequent launches. Due to thermal expansion and contraction effects, residual heat can cause slight changes in the structural dimensions of the launching device, and this change may gradually accumulate after multiple launches, leading to deviations in the initial launch conditions of projectiles or other launched objects, thus reducing launch accuracy.
In practical applications, researchers have adopted various measures to reduce the negative impacts of microthermal residuals. One common method is to optimize the heat dissipation design of the launching device. By using materials with high thermal conductivity to manufacture the launching rails and related components, such as copper alloys or carbon fiber composites, heat conduction and dissipation can be accelerated. At the same time, designing efficient cooling systems, such as forced air cooling, water cooling, or liquid cooling, can quickly remove residual heat during launch intervals, preventing excessive heat accumulation. Another strategy is to improve the waveform and parameters of the launch pulse. By reasonably adjusting the rise time of the current, peak current, and pulse width, the total heat generated during the launch process can be reduced while ensuring launch performance, thereby minimizing microthermal residuals.
Additionally, advanced material coating technologies have been applied to directed electromagnetic emission systems. Coating the surface of the launching rails with materials that have good thermal stability and low friction coefficients can not only reduce resistive heating during current flow but also lower frictional heating between the rails and the armature, suppressing the generation of microthermal residuals from multiple angles.
Microthermal residuals are an issue that cannot be ignored in directed electromagnetic emission technology. In-depth research on their formation mechanisms and the implementation of effective countermeasures are key steps in advancing directed electromagnetic emission technology from the laboratory to practical applications, enhancing system performance and reliability. With the continuous development of materials science, thermal management technology, and electromagnetic theory, it is believed that in the future, the issue of microthermal residuals will be more effectively resolved, laying a solid foundation for the widespread application of directed electromagnetic emission technology.
⛳️ Operational Results
📣 Sample Code
%}
% Beam divergence after passing near a star, with reference divergence lines
clear; clc; close all % Clear environment and prepare workspace
% Physical constants
G = 6.6743e-11; % [m^3/kg/s^2]
M = 0.35*1.989e30; % solar mass [kg]
c = 2.99792458e8; % [m/s]
AU = 1.496e11; % [m]
R_sun = 6.96e8; % [m]
%% Simulation parameters:
b_vals = linspace(1, 5, 5) * R_sun; % Impact parameters: multiples of the solar radius
L_pc = linspace(1, 30000, 2000); % X axis: distance in [pc]
L_m = L_pc * 3.086e16; % [m]
theta_vals = [1e-7, 1e-8, 1e-9, 1e-10]; % Fixed beam divergences [rad]
baseline_theta = 1e-7; % for comparison purposes [rad]
regions = [153, 307, 1534, 30000];
%% Simulation
% Initialization
W = NaN(length(b_vals), length(L_m)); % NaN to hide pre-focus zone
% CASE 1: Calculates the post-focal beam envelope for rays grazing a lensing star
% at various impact parameters (b = 1? R_sun). Each ray experiences a
% deflection Theta = 4GM/(c^2), resulting in a focal distance f = b/Theta.
🔗 References
[1] Feng Chong. Research on Near-field Thermal Radiation Phenomena and Testing Technologies in Micro-nano Devices [D]. Dalian University of Technology, 2013.
Microthermal Residuals from Directed Electromagnetic Emissions as a New Class of Technosignature” by Sergio Bonaque-González (2025), submitted to publication on April 2025
🎈 Some theoretical references are from online literature; if there is any infringement, please contact the author for removal.
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