Switchable Magnet Unit for Linac Beam Startup Intensity Control
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Solution Overview
Problem
Existing linear accelerator systems experience initial intensity variations in MeV electron beams during startup, which are disadvantageous for radiation protection due to the time lag required for resonant tuning of the radiofrequency source, leading to non-compliance with radiation safety standards.
Innovation Solution
Incorporation of a switchable magnet unit within the linear accelerator cavity to generate a magnetic field that deflects electrons away from the exit port, allowing independent control of electron beam intensity, enabling rapid adjustment between deflection and beam generation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radiofrequency source is resonantly tuned to the linear accelerator cavity, then the MeV electron beam can be generated, but a time lag of 100 ms or longer occurs during startup causing intensity variation
Solution Approach 1:
The magnet unit is switched to deflection mode before electron injection to pre-establish safe operating conditions. This preliminary action ensures that even if electrons are accidentally injected during the resonant tuning period, they will be deflected and not contribute to harmful radiation intensity variations.
Solution Approach 2:
The magnet unit acts as an intermediary control mechanism between the radiofrequency source and the electron beam. By introducing this intermediate magnetic field control, the system can independently manage beam intensity without being constrained by the resonant tuning time of the radiofrequency source.
2Object-affected harmful factors
If the magnet unit is switched to deflection mode, then electron beam intensity is reduced for radiation safety, but the beam generation capability is compromised
Solution Approach 1:
The magnet unit dynamically switches between deflection mode and beam generation mode based on operational requirements. This dynamic control allows the system to optimize between radiation safety and beam generation efficiency at different time points, rather than being fixed in one state.
Solution Approach 2:
The magnet unit operates in periodic cycles, alternating between deflection mode during resonant tuning and beam generation mode during steady-state operation. This periodic switching pattern ensures radiation safety during critical transition periods while maintaining productivity during stable operation periods.
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 solution allows for precise regulation of electron beam intensity, ensuring compliance with radiation protection requirements by reducing intensity fluctuations and enabling swift transitions to safe operating conditions.
Implementation Method 1
a switchable magnet unit which, in deflection mode, is designed to generate a magnetic field within the linear accelerator cavity
Implementation Method 2
at least one electron emitted within the linear accelerator cavity interacts with the enclosure due to deflection away from the exit port by the magnetic field
Implementation Method 3
the electrons are accelerated to energies in excess of 1 MeV, in particular via a radiofrequency source, in a linear accelerator cavity
Data Source
AI summary
A linear accelerator system according to an embodiment is for generating an MeV electron beam. The linear accelerator system includes a linear accelerator cavity having an enclosure, wherein the enclosure is open at one end to provide an exit port for the MeV electron beam; and a switchable magnet unit designed to, in a deflection mode, generate a magnetic field within the linear accelerator cavity to enable at least one electron, emitted within the linear accelerator cavity, to interact with the enclosure due to deflection away from the exit port caused by the magnetic field. Accordingly, in an embodiment, in the deflection mode, an intensity of the MeV electron beam passing through the exit port is relatively lower than an intensity of the MeV electron beam passing through the exit port in a beam generation mode of the switchable magnet unit.