Optical Undulator X-Ray Source Using Coherent Laser Pulses
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Solution Overview
Problem
Current electron beam-based systems for generating short-wavelength electromagnetic radiation, such as x-rays, are limited by the size, cost, and complexity of undulators and the inefficiency of inverse Compton scattering at high field amplitudes, making them less competitive with undulator-based light sources.
Innovation Solution
A method involving an optical undulator where laser radiation is injected into an optical cavity, with carefully timed and phased optical micropulses to create a high-intensity optical undulator field, allowing electron micropulses to interact and generate electromagnetic radiation with a normalized vector potential greater than 0.1, optimizing x-ray power and reducing electron energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional undulators are used to generate short-wavelength electromagnetic radiation, then the radiation power is sufficient, but the system size becomes large and construction cost increases
Solution Approach 1:
The patent replaces the mechanical undulator system (physical array of dipole magnets) with an optical undulator using laser radiation to generate the required electromagnetic field. This substitution eliminates the need for large-scale mechanical undulator structures while maintaining the ability to generate intense short-wavelength radiation through inverse Compton scattering
Solution Approach 2:
The patent changes the operating parameters by using high-field amplitude laser radiation with normalized vector potential approaching unity, which dramatically increases the radiated power per unit length. This parameter change allows compact system design while achieving high radiation power output
2Power
If inverse Compton scattering is used with low field amplitudes, then the system can operate, but the radiated power is insufficient to be competitive with undulator-based sources
Solution Approach 1:
The patent fundamentally changes the field amplitude parameter from low to high, using laser radiation with normalized vector potential approaching unity. This parameter change enables inverse Compton scattering to become competitive with traditional undulator sources by increasing radiated power by several orders of magnitude
Solution Approach 2:
The patent uses periodic laser pulses with specific timing and phase relationships to create coherent reinforcement of the optical micropulses in the cavity. This periodic action with normalized vector potential > 0.1 maximizes the radiated power while maintaining system stability
3Power
If high energy electron beams are used to achieve high power output, then the radiation intensity increases, but the accelerator system becomes more expensive and complex
Solution Approach 1:
The patent uses short-duration high-power laser pulses to rapidly generate the required electromagnetic field, allowing the interaction to occur in a compressed time frame. This approach achieves high radiation intensity without requiring continuously operating complex accelerator systems
Solution Approach 2:
The patent employs periodic laser pulsing with normalized vector potential > 0.1 to achieve high average power output through coherent accumulation in the optical cavity, reducing the need for continuously high-energy electron beams and simplifying the accelerator requirements
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
This approach achieves x-ray power per unit length that is 10,000 times higher than traditional undulators, significantly reducing the size and cost of the system while offering flexibility in wavelength generation, comparable to undulator-based sources.
Implementation Method 1
at least one optical macropulse gives rise to an associated circulating optical micropulse that is coherently reinforced by subsequent optical micropulses in the optical macropulse
Implementation Method 2
injecting laser radiation of a given wavelength into an optical cavity that is characterized by a round-trip transit time (RTTT) for radiation of that given wavelength
Implementation Method 3
A related physical phenomenon, inverse Compton scattering, has also been investigated as a means for production of short wavelength electromagnetic radiation
Implementation Method 4
the magnetic component of the Lorentz force ev x B imposes both a periodic transverse acceleration and a periodic transverse velocity on the motion of the electrons moving through the field
Implementation Method 5
the Doppler shift, in which the radiation emitted by moving charges is upshifted in frequency along the direction of motion
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A method of generating energetic electromagnetic radiation (70) comprises, during each of a plurality of separated radiation intervals, injecting laser radiation (50) of a given wavelength into an optical cavity (30) that is characterized by a round-trip transit time (RITT) for radiation o that given wavelength. At least some radiation intervals are defined by one or more optical macropulses, at least one macropulse gives rise to an associated circulating optical micropulse (60) that is coherently reinforced by subsequent optical micropulses in the optical macropulse and the electric field amplitude of the circulating optical micropulse (60) at any given position in the cavity (30) reaches a maximum value during the radiation interval.