Neutron Beam Collimator Using Magnetic Phase Shift Gradients
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Solution Overview
Problem
Conventional collimators, such as Söller collimators, often result in a significant loss of beam intensity due to their design, limiting the collimation efficiency and resolution in applications like neutron imaging and materials characterization.
Innovation Solution
A collimator system that prepares a beam in a well-defined polarization state by mapping transverse momentum onto polarization and using a polarizer and analyzer with a gradient system to introduce phase shifts, allowing for improved collimation through multiple iterations with increasing phase shifts, thereby reducing beam divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional Söller collimators are used to collimate neutron beams, then beam collimation is achieved, but beam intensity is significantly lost
Solution Approach 1:
The patent replaces the mechanical Söller collimator system with a magnetic field-based collimation system. Instead of using physical absorber plates to block neutrons, the invention uses magnetic fields to manipulate neutron spin states and selectively transmit collimated neutrons, thereby eliminating the need for heavy absorber materials that cause intensity loss.
Solution Approach 2:
The patent changes the collimation approach from spatial filtering (fixed geometry) to dynamic magnetic field control. By varying magnetic field strength and orientation, the system achieves collimation without fixed physical barriers, allowing flexible control while preserving beam intensity through non-absorbing magnetic interactions.
2Manufacturing precision
If conventional collimators with absorber materials are used, then beam collimation is achieved, but the complexity and weight of the system increases
Solution Approach 1:
The patent replaces mechanical absorber plates with magnetic field components. The collimation system uses magnetic fields to control neutron trajectories through spin-state manipulation, eliminating the need for heavy absorber materials and complex mechanical structures while achieving the same collimation function.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the neutron source and the detector. Instead of direct mechanical blocking, magnetic fields serve as a mediating mechanism that selectively guides neutrons, providing a simpler and more flexible collimation approach without physical barriers.
3Measurement precision
If conventional collimators are used to achieve beam collimation, then spatial resolution is improved, but temporal resolution and imaging speed are limited
Solution Approach 1:
The patent employs dynamic magnetic field control rather than static mechanical structures. The magnetic fields can be rapidly adjusted and turned on/off, enabling the system to achieve high spatial resolution through magnetic steering while maintaining fast imaging speeds through dynamic control, unlike fixed mechanical collimators that limit temporal response.
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 preserves a larger portion of the beam intensity, achieving higher intensity and spatial-temporal resolution in real-time neutron imaging and other applications, with the ability to adapt for various particle and photon beams.
Implementation Method 1
a gradient system that applies phase shift gradients to a polarized neutron beam, mapping transverse momentum onto polarization
Implementation Method 2
preparing a beam in a well-defined polarization state by mapping transverse momentum onto polarization
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
In a general aspect, a collimator system is described. In some aspects, a neutron beam collimation method includes receiving a neutron beam from a neutron source; polarizing the neutron beam using a polarizer, and obtaining a collimated neutron beam from the polarized neutron beam. The neutron beam generated by the neutron source has a first beam divergence and includes a plurality of neutrons. The collimated neutron beam has a second beam divergence that is less than the first beam divergence. Obtaining the collimated neutron beam includes mapping transverse momentum of each respective neutron, of the plurality of neutrons, onto a polarization degree of freedom of the respective neutron by applying a sequence of phase shift gradients to the polarized neutron beam, and after applying the sequence of phase shift gradients, passing the polarized neutron beam through an analyzer.