Irradiation Station Cooling for Solid-Target Temperature Control
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Solution Overview
Problem
Existing radioisotope production systems face issues with productivity due to variability in proton beam parameters and temperature management, leading to potential disjunction of the solid target material from the metal support, which compromises production.
Innovation Solution
A container design for solid target material with a degrading foil and laminar fluid cooling system that maintains temperature within a safe range and allows precise alignment with the proton beam, featuring a hermetic seal and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam current is increased to improve productivity, then productivity increases, but temperature of the irradiation station and solid target material increases causing thermal expansion and potential disjunction
Solution Approach 1:
A cooling fluid circulation system is introduced as an intermediary between the solid target material and the surrounding environment. The cooling fluid flows through channels in the support structure, absorbing heat from the irradiated target material and preventing excessive temperature rise, thereby enabling sustained high beam current operation without thermal damage or disjunction.
Solution Approach 2:
The physical state of the support structure is modified by introducing controlled thermal parameters through cooling fluid circulation. By adjusting the flow rate and temperature of the cooling fluid, the thermal field distribution is optimized to maintain the target material within safe operating temperature ranges even at high beam currents, thus resolving the contradiction between productivity and temperature control.
2Productivity
If beam current is increased to improve productivity, then productivity increases, but thermal expansion causes disjunction of solid target material from metal support
Solution Approach 1:
The cooling fluid acts as a thermal intermediary that absorbs expansion forces and thermal stress through controlled circulation. By maintaining uniform temperature distribution, the cooling system prevents differential thermal expansion between the target material and support structure, thereby preventing disjunction while allowing high beam current operation for improved productivity.
Solution Approach 2:
The design explicitly accounts for thermal expansion by incorporating cooling channels that compensate for expansion forces. The cooling fluid circulation creates a controlled thermal environment that minimizes differential expansion between dissimilar materials (target material and metal support), preventing disjunction and maintaining structural stability during high-power irradiation.
3Temperature
If cooling system is added to control temperature, then temperature control improves, but device complexity increases
Solution Approach 1:
The cooling channels are merged with the support structure itself, integrating the cooling function into the existing mechanical framework. This integration eliminates the need for separate cooling apparatus and reduces overall system complexity while maintaining effective temperature control during irradiation.
Solution Approach 2:
The support structure serves multiple functions: it provides mechanical support for the target material, conducts heat away from the irradiation zone, and maintains structural integrity during thermal cycling. This multi-functionality reduces the need for additional components, thereby controlling device complexity while achieving effective temperature management.
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
Enhances productivity by maintaining optimal temperature and alignment, preventing disjunction and ensuring efficient radioisotope production.
Implementation Method 1
a fluid cooling system which is connected to the support for the relative cooling during the proton bombardment
Implementation Method 2
a degrading foil (10) which is calibrated for mitigating the proton beam (B) in a pre-established manner
Data Source
AI summary
An irradiation station for producing a radioisotope, having a cyclotron for emitting a proton beam against a solid target material placed in a container and a cooling system for cooling the container. The container has a wall for supporting the solid target material and a cavity, which borders the wall and has an opening transverse to the axis of the container. The cooling system has a connection head which is couplable to the opening for circulating a cooling fluid in the cavity and comprises a flow diverter, a tip protruding from a hole of the flow diverter and movable along the hole against the action of a spring in contact with the tip, and an electrical connector in contact with the spring. When the connection head is coupled to the opening the flow diverter enters the cavity coaxially with the container and the tip presses against the wall.