Nano-wire Grid Target for Laser-Driven Ion Beam Therapy
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Solution Overview
Problem
Current ion beam treatments for cancer, such as X-ray and electron beam therapies, often cause significant side effects to healthy cells due to non-specific radiation exposure, while ion beam treatments require high-energy ions to penetrate deep into the body effectively, necessitating ultra-thin targets and expensive high-power lasers for precise tumor targeting.
Innovation Solution
An ion generation target comprising a grid of nano-wire shape with an attached thin film, utilizing a femtosecond laser to induce a nanoplasmonics phenomenon, creating a near field with intensified electromagnetic energy to generate high-energy protons or carbon ions for precise tumor targeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultra-thin film targets are used to generate high-energy ions, then ion energy uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The target is divided into a grid structure consisting of multiple thin wire elements arranged in a pattern. This segmentation allows the laser to interact with individual wire elements, creating localized plasma regions that generate ions with more uniform energy distribution compared to a solid thin film target.
Solution Approach 2:
The invention uses thin wire elements instead of an ultra-thin film. Each wire element has a diameter of 1-10 micrometers and length of 10-100 micrometers, providing the necessary thinness for high-energy ion generation while maintaining structural integrity and ease of fabrication through grid patterns.
2Power
If high-power lasers are used to accelerate ions, then ion acceleration energy is improved, but cost and device complexity increase
Solution Approach 1:
The invention changes the target parameters (grid structure with specific wire dimensions) to optimize the laser-target interaction. By adjusting the wire diameter to 1-10 micrometers and length to 10-100 micrometers, the system achieves efficient ion acceleration with reduced laser power requirements compared to conventional thin film targets.
Solution Approach 2:
The invention replaces the need for increasingly powerful mechanical laser systems with an optimized target structure that enhances the laser-plasma interaction efficiency. The grid geometry naturally concentrates the laser energy into localized regions, achieving high ion energies without requiring proportionally higher laser powers.
3Device complexity
If conventional thin film targets are used, then device simplicity is maintained, but ion energy uniformity and deep tumor targeting capability deteriorate
Solution Approach 1:
The target is divided into a grid structure consisting of multiple thin wire elements arranged in a pattern. This segmentation allows the laser to interact with individual wire elements, creating localized plasma regions that generate ions with more uniform energy distribution compared to a solid thin film target.
4Speed
If ions are accelerated to high energy for deep tumor penetration, then treatment depth is improved, but side effects to healthy cells increase
Solution Approach 1:
The grid target structure provides inherent feedback control for ion energy distribution. The discrete wire elements create localized plasma regions that naturally limit the spread of ionization, resulting in a sharper Bragg peak and reduced lateral scattering of ions, thereby minimizing exposure to healthy cells while maintaining deep penetration capability.
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 allows for the generation of high-energy ions with uniform energy distribution, reducing side effects by precisely targeting tumors with ions that can be stopped at specific depths within the body, thus effectively treating deep-seated tumors while minimizing exposure to healthy tissues.
Implementation Method 1
utilizing a femtosecond laser to induce a nanoplasmonics phenomenon, creating a near field with intensified electromagnetic energy
Implementation Method 2
When high-power laser beam is emitted to a thin film, ions or protons within the thin film may escape with acceleration energy by a target normal sheath acceleration model (TNSA model) or a radiation pressure acceleration model (RPA model)
Implementation Method 3
the ion beam is subject to the most energy loss of ionizing radiation just before the ion beam is stopped. This phenomenon is called a Bragg peak after William Henry Bragg, which discovered the phenomenon in 1903
Data Source
AI summary
Provided are an ion generation target and a treatment apparatus including the target. The treatment apparatus includes a grid having a net shape of nano wires, an ion generation thin film attached to a side of the grid and generating ions by means of an incident laser beam, and a laser for emitting a laser beam into the nano wire of the grid to generate ions from the ion generation thin film and project the ions onto a tumor portion of a patient. The laser beam emitted into the nano wire forms a near field, the intensity of which is higher than that of the laser beam through a nanoplasmonics phenomenon, and the near field emits the ions from the ion generation thin film.