Resonant Beam Blanker for High-Energy Particle Optics
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Solution Overview
Problem
Existing beam blankers face challenges in achieving high frequency operation at lower power and higher sensitivity, particularly when dealing with higher energy beams, as they require increased amplitude and dV/dt, which is difficult to achieve, especially in applications like Transmission Electron Microscopes where the beam energy is significantly higher than in conventional systems.
Innovation Solution
The beam blanker employs a resonant structure with a quality factor Q to amplify the deflection amplitude, using an LC network or waveguide coupled to an RF oscillator, generating an electric field that sweeps the beam over an aperture twice per period, allowing for higher frequency operation with lower power consumption and increased sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If conventional beam blankers are used for high energy beams, then beam blanking function is achieved, but power consumption increases and sensitivity decreases
Solution Approach 1:
The patent applies resonant oscillation of the electric field in the beam blanker. By tuning the blanking frequency to match the resonant frequency of the electron beam oscillations, the system achieves enhanced blanking performance with reduced power consumption. The resonant condition creates a standing wave pattern that maximizes the deflection effect at minimal energy input.
Solution Approach 2:
The patent changes the operating parameters by utilizing the natural resonant frequency of the electron beam rather than applying arbitrary high-frequency blanking signals. This parameter optimization allows the system to achieve the same blanking effect with significantly lower power requirements while maintaining or improving sensitivity.
2Loss of time
If higher frequency operation is achieved, then time resolution improves, but power requirements increase
Solution Approach 1:
The patent employs periodic blanking signals that are synchronized with the resonant oscillation period of the electron beam. This periodic action at the resonant frequency achieves high time resolution for studying ultra-fast phenomena while minimizing power consumption through constructive interference of the oscillating fields.
Solution Approach 2:
By exploiting the natural vibrational resonance of the electron beam, the system achieves high-frequency operation necessary for femtosecond time resolution without requiring excessive power. The resonant vibration amplifies the blanking effect naturally, reducing the need for high-power driving signals.
3Adaptability or versatility
If beam energy is increased, then application versatility improves, but required deflection voltage increases
Solution Approach 1:
The patent optimizes the blanking frequency parameter to match the resonant frequency, which scales with beam energy. This allows the system to maintain effective blanking performance across a wide range of beam energies without requiring proportionally higher deflection voltages, thereby extending application versatility.
Solution Approach 2:
The resonant oscillation mechanism provides natural amplification of the deflection effect. Even at higher beam energies where more force would normally be required, the resonant condition creates constructive interference that enhances the deflection voltage produced by the blanking fields, reducing the power penalty associated with higher energy beam 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
This approach enables efficient high-frequency beam blanking with reduced power requirements and enhanced sensitivity, suitable for applications like Transmission Electron Microscopes, enabling the study of ultra-fast phenomena on a femtosecond scale with improved brightness and time resolution.
Implementation Method 1
the electric field is generated by a resonant structure with a resonant frequency f, the resonant structure equipped to generate an electric field that sweeps the beam over the aperture twice per period of the frequency f
Implementation Method 2
means for generating an electric field perpendicular to said axis, the electric field for deflecting the charged particles
Implementation Method 3
By making the deflection means part of a resonant structure, the amplitude of the deflector is amplified by a factor Q, in which Q is the quality factor of the resonant structure
Implementation Method 4
means for generating an electric field perpendicular to said axis, the electric field for deflecting the charged particles
Data Source
AI summary
The invention relates to an electrostatic beam blanker for a particle-optical apparatus, in which the blanker is used to generate a train of pulses with a fixed repetition rate. Such pulse trains with a sub-picosecond pulse length are for example used in the study of chemistry in the femtosecond scale.The beam blanker according to the invention uses a resonant structure, as a result of which the voltage is amplified by the quality factor Q of the resonant structure. During each zero-crossing of the signal, thus twice per period of the resonant frequency, the beam is transmitted, and the beam is blanked during the rest of the time. In a preferred embodiment the resonant structure comprises a transmission line. Impedance matching of signal source and resonant structure may be performed by tuning stubs.