Shock Injector Supersonic Gas Flow Laser Plasma Accelerator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current laser plasma accelerators struggle to generate stable electron beams using low laser energies due to the inability to create a sharp density transition between gas regions over a short enough distance, which is necessary for efficient electron injection.
Innovation Solution
A shock injector device is used to create a supersonic flow of gas with an oblique shock wave, generating a sharp density transition between two gas regions with a width of less than 5 microns, allowing for effective electron injection and acceleration with low laser energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gas delivery methods are used in laser plasma accelerators, then the system is simple to operate, but a sharp density transition between gas regions cannot be achieved over a short distance
Solution Approach 1:
The gas delivery system is segmented into distinct regions (high-density and low-density) separated by an oblique shock wave. The nozzle is divided into a converging section and a diverging section with a specific ramp angle, creating discrete gas density zones that enable sharp transitions necessary for low-energy electron injection.
Solution Approach 2:
An oblique shock wave is introduced as an intermediary mechanism to create the density transition. The shock wave acts as a mediator between the high-pressure reservoir and the expansion region, producing a sharp density interface without requiring complex mechanical structures or multiple gas sources.
2Reliability
If high laser energies are used for electron injection, then electron beams can be generated, but the system cannot achieve stable injection with low laser energies
Solution Approach 1:
The gas density parameter is changed spatially to create a sharp transition zone. By controlling the density ratio across the shock wave and adjusting the ramp angle, the plasma conditions are optimized to enable efficient electron injection at low laser energies (10-100 mJ range), improving reliability without requiring high energy input.
3Manufacturing precision
If a sharp density transition is created over a short distance, then low laser energy electron injection becomes possible, but the gas flow becomes turbulent and unstable
Solution Approach 1:
The gas flow is designed to be dynamic rather than static, using continuous supersonic flow through the shock injector to maintain a stable shock front. The moving gas flow prevents turbulence by continuously replenishing the density transition zone, maintaining stability while achieving the required sharp density gradient for low-energy operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shock injector enables stable electron injection and acceleration using laser energies as low as 10 mJ, improving the efficiency of laser plasma acceleration and enabling applications in medical and research fields.
Implementation Method 1
The throat is configured to generate a supersonic flow of a gas when the gas flows through the throat
Implementation Method 2
A transition region between the first region and the second region is an oblique shock wave having a width of less than about 5 microns
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to laser plasma accelerators. In one aspect a block of material defines a gas inlet, a chamber in fluid communication with the gas inlet, a throat in fluid communication with the chamber, a channel in fluid communication with the throat, and a gas outlet in fluid communication with the channel. The throat is configured to generate a supersonic flow of a gas when the gas flows through the throat. The channel includes a ramp that is positioned proximate the gas outlet, with the ramp being inclined at an angle with respect to a direction of a flow of the gas proximate a surface of the channel prior to the ramp at the gas outlet.