Modular Laser Plasma X-Ray Source With Liquid Metal Target Refresh
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Solution Overview
Problem
Conventional X-ray instruments face limitations in brilliance due to anode melting, require frequent maintenance, and are large and immobile, hindering their application in X-ray microscopy and maintenance.
Innovation Solution
A modular laser-produced plasma X-ray system utilizing a liquid metal flow system within a vacuum chamber, where laser pulses form X-rays, preventing debris accumulation on windows through evaporation or ablation, and allowing for maintenance-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional X-ray tubes with fixed or rotating anodes are used, then X-ray generation is achieved, but the anode melts due to maximum power density limitations
Solution Approach 1:
The patent replaces the mechanical rotating anode system with a laser-produced plasma source. Instead of mechanically rotating an anode to distribute heat, the invention uses laser pulses to generate plasma in a gas flow, eliminating the mechanical anode system entirely and allowing much higher power densities without melting issues.
Solution Approach 2:
The patent changes the fundamental operating parameters from continuous electron beam bombardment of a solid anode to pulsed laser interaction with gas. This parameter change allows achieving higher brilliance while avoiding anode melting by using a gaseous target that can withstand extreme energy densities.
2Power
If rotating anode is used to distribute energy, then higher power electron beams can be used, but the electron beam cannot be focused to a tight spot and maximum achievable brilliance is lower
Solution Approach 1:
The patent replaces the electron beam focusing system with laser beam focusing. Lasers can be focused to much tighter spots than electron beams in rotating anode systems, achieving higher brilliance. The laser produces a concentrated plasma source that emits X-rays with the desired directional characteristics.
Solution Approach 2:
The patent uses pulsed laser operation instead of continuous electron beam. The periodic pulsed action allows the plasma to form and emit X-rays in short bursts, achieving high peak brilliance while the gas flow continuously replenishes the target material, preventing accumulation and maintaining consistent performance.
3Power
If solid target sources are used, then X-ray generation is achieved, but fine metal powder debris accumulates inside the vacuum chamber requiring frequent cleaning
Solution Approach 1:
The patent replaces solid target sources with a gas flow target system. By using gas instead of solid metal targets, the invention eliminates the generation of metal powder debris that would accumulate in the vacuum chamber. The gaseous target material is continuously flowed through the interaction region and exhausted, preventing debris accumulation and reducing maintenance requirements.
Solution Approach 2:
The patent employs gas flow dynamics to transport the target material through the laser interaction zone. The continuous gas flow carries the target atoms past the laser focus point, and the flowing gas naturally removes any debris or byproducts from the interaction region, eliminating the need for frequent vacuum chamber cleaning.
4Power
If traditional X-ray systems are used, then X-ray generation is achieved, but the systems are large, immobile, and difficult to take apart for maintenance
Solution Approach 1:
The patent employs a modular design where the laser system, gas flow system, and detection components can be segmented and arranged in a compact configuration. This modular approach allows the system to be more compact and easier to disassemble for maintenance compared to traditional large-scale synchrotron or rotating anode X-ray systems.
Solution Approach 2:
The patent replaces large mechanical components like rotating anodes and complex condenser optics with a compact laser-produced plasma source. The laser system and gas flow apparatus occupy much less space than traditional X-ray tube assemblies, enabling a more compact and mobile system design that is easier to relocate and maintain.
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 system achieves high brilliance X-ray emission with reduced maintenance needs, enabling compact and mobile X-ray instruments suitable for microscopy.
Implementation Method 1
a laser pulse emitter configured to transmit laser pulses into the chamber via a laser window, focusing optics, located between the emitter and the metal target, the focusing optics directing the laser pulses to strike the metal target at a target location to form X-ray pulses
Implementation Method 2
the laser pulses prevent debris from accumulating on the laser window, and the laser pulses reflect off the target surface onto the X-ray window and prevent debris from accumulating on the X-ray window
Implementation Method 3
the laser pulses prevent debris from accumulating on the laser window, and the laser pulses reflect off the target surface onto the X-ray window and prevent debris from accumulating on the X-ray window
Implementation Method 4
a liquid metal flow system enclosed within a low-pressure chamber, the flow system including a liquid metal, wherein in at least one location on the liquid metal forms a metal target, a circulation pump within the liquid metal flow system for circulating the liquid metal
Data Source
AI summary
A modular laser-produced plasma X-ray system includes a liquid metal flow system enclosed within a low-pressure chamber, the flow system including a liquid metal, wherein in at least one location on the liquid metal forms a metal target directly illuminated by laser pulses, a circulation pump within the liquid metal flow system for circulating the liquid metal, a laser pulse emitter configured to transmit laser pulses into the chamber via a laser window, focusing optics, located between the emitter and the metal target, the focusing optics directing the laser pulses to strike the metal target at a target location to form X-ray pulses, and an X-ray window positioned within the chamber to enable the X-ray pulses to exit the chamber.