Terahertz Evanescent Field Ion Accelerator
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Solution Overview
Problem
Current particle acceleration methods, such as microwave-driven accelerators and laser-driven systems, are costly, complex, and inefficient for achieving the high energies and narrow energy spreads required for hadron therapy, particularly due to large energy spreads and limited compactness, which hinders their application in cancer treatment.
Innovation Solution
A terahertz frequency-based particle accelerator setup utilizing evanescent fields from THz electromagnetic pulses, with a pair of bulk crystals and a terahertz radiation source, to accelerate ions with a compact and cost-effective design, achieving quasi-monoenergetic beams with reduced energy spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional microwave-driven accelerators or laser-driven systems are used to accelerate ions, then high energies can be achieved, but the energy spread is too wide and the setup is too complex and costly for hadron therapy
Solution Approach 1:
The patent replaces traditional microwave-driven mechanical accelerator structures with a laser-driven system that uses optical fields to accelerate ions. This substitution enables compact design while achieving the required ion energies, directly addressing the contradiction between energy achievement and system complexity
Solution Approach 2:
The patent employs chirped pulse amplification to generate laser pulses with specific temporal and spectral characteristics. By controlling the chirp parameter and pulse duration, the system achieves narrow energy spread in the accelerated ion beam, resolving the contradiction between energy spread and system complexity
2Volume of moving object
If laser-driven ion acceleration is used, then the setup can be more compact, but the energy spread remains too wide for therapeutic applications
Solution Approach 1:
The patent uses periodic laser pulse trains with specific timing and duration characteristics to accelerate ions. The periodic structure of the laser pulses, combined with chirp control, enables both compact acceleration and narrow energy spread by synchronizing the acceleration process with the pulse timing
Solution Approach 2:
The patent dynamically controls the laser pulse parameters including duration, intensity, and chirp to optimize both the compactness of the accelerator and the narrowness of the energy spread. The dynamic adjustment of these parameters allows the system to achieve therapeutic quality beams in a compact format
3Volume of moving object
If high-intensity laser pulses are used for ion acceleration, then acceleration can occur in compact setups, but synchronization between the ion beam and electromagnetic field becomes difficult
Solution Approach 1:
The patent applies chirped pulse amplification to pre-condition the laser pulses with specific temporal and spectral characteristics before the acceleration process. This preliminary action of chirping the pulses simplifies the synchronization requirement by creating a time-stretched pulse structure that naturally matches the ion beam dynamics, making the compact accelerator easier to operate
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 setup provides a compact, cost-effective means to accelerate ions to the required energies for hadron therapy, producing a monochromatic beam with a significantly reduced energy spread, suitable for cancer treatment applications.
Implementation Method 1
acceleration of electrically charged particles using the evanescent field of electromagnetic pulses with a frequency in the terahertz range
Implementation Method 2
said electromagnetic pulses are made to undergo total internal reflection
Data Source
Figure 1~3
Figure 2A~2B
AI summary
The invention relates to a such particle accelerator setup (1, 11 ) and method based on the total reflection of electromagnetic pulses with a frequency falling into the THz frequency domain that utilize the evanescent filed for the acceleration of electrically charged particles. Said setup includes a radiation source (5) to emit high-energy THz-pulses, preferably comprising a few optical cycles, having a large peak electric field strength, as well as two optical elements (2, 12) in the form of a pair of bulk crystals made of a substance that exhibits large refractive index, low dispersion and high optical destruction threshold, wherein said optical elements are transparent for the THz radiation. The inventive solutions represent much simpler, more compact and more cost effective alternatives compared to the prior art particle accelerator setups.