Thermally Conductive Partitioning for Polarizing Xenon Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hyperpolarization of Xenon (129Xe) techniques face limitations in increasing polarized gas output due to elevated gas temperatures caused by increased laser power, which reduces spin-exchange rates and alkali vapor density, and the low thermal conductivity of glass polarizing cells restricts the production of hyperpolarized Xenon.
Innovation Solution
A thermally conductive partitioning system within the polarizing cell, made from materials like copper or aluminum, divides the cell into channels to efficiently dissipate heat and maintain optimal temperature, allowing for higher laser power usage and simultaneous alkali vapor extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser power is increased to increase the production rate of polarized 129Xe, then the rate of production increases, but the gas temperature rises which reduces spin-exchange rates and alkali vapor density
Solution Approach 1:
The polarizing cell is divided into multiple channels separated by partition walls, allowing laser light to illuminate multiple regions simultaneously. This segmentation increases the effective interaction volume between laser light and gas mixture, enabling higher production rates without excessive temperature rise in any single region
Solution Approach 2:
Thermally conductive materials (such as copper or aluminum) are introduced as intermediary elements between the laser-heated gas regions and the thermal reservoir. These materials efficiently conduct heat away from the polarizing regions, maintaining optimal gas temperature despite increased laser power input
2Reliability
If the polarizing cell is made entirely of glass to preserve polarization, then polarization is maintained, but thermal conductivity is too low to dissipate heat effectively
Solution Approach 1:
The polarizing cell employs a composite construction combining glass components (for polarization preservation at interfaces) with thermally conductive materials (such as copper or aluminum) for the bulk structure and heat dissipation pathways. This composite approach simultaneously achieves both polarization preservation and effective heat management
Solution Approach 2:
Thermally conductive intermediary materials are introduced between the laser-heated gas regions and the thermal reservoir, acting as heat transfer mediators that do not interfere with the polarization process but efficiently remove excess heat from the system
3Reliability
If the transverse dimension of the polarizing cell is increased to improve alkali vapor extraction, then extraction efficiency improves, but the length of the lower temperature section must be increased which becomes impractical
Solution Approach 1:
The cell structure is segmented into multiple channels with partition walls that increase the surface area available for alkali vapor condensation and extraction. This segmentation allows efficient extraction to occur over a shorter overall length by providing multiple parallel pathways for vapor removal
Solution Approach 2:
The extraction mechanism is extended from a purely longitudinal process to include transverse dimension utilization through the partition wall structure. Alkali vapor can condense on the walls of multiple channels simultaneously, effectively increasing the extraction surface area without proportionally increasing the cell length
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 a significant increase in the rate of production of polarized 129Xe by stabilizing gas temperatures and enhancing thermal conductivity, overcoming the limitations of glass cells and achieving higher polarization rates with increased laser power.
Implementation Method 1
A first aspect of the present invention is described in claim 1. In one embodiment, at least one part of the polarizing cell is made of a material with thermal conductivity higher than glass
Implementation Method 2
The laser is positioned to allow laser light to enter through a transparent window into the polarizing cell, most beneficially in a direction opposite the flow of the gas mixture
Implementation Method 3
The alkali metal vapor which comes in contact with this wall due to diffusion will condense on the wall, decreasing the alkali vapor density in the flowing gases
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A polarizing apparatus has a thermally conductive partitioning system in a polarizing cell. In the polarizing region, this thermally conductive partitioning system serves to prevent the elevation of the temperature of the polarizing cell where laser light is maximally absorbed to perform the polarizing process. By employing this partitioning system, increases in laser power of factors of ten or more can be beneficially utilized to polarize xenon. Accordingly, the polarizing apparatus and the method of polarizing129Xe achieves higher rates of production.