Plasma simulation of hot-surface-microwave hybrid ion sources
JOURNAL OF INSTRUMENTATION(2022)
Abstract
To generate high-current hard-to-ionize elements such as B+, a hybrid ion source that combines electron cyclotron resonance and thermal surface ionization, which is called a high-temperature surface microwave source (HSMS), is under development. A high-temperature hot surface (2000 degrees) and microwave heating are the essential components of an HSMS to produce high-energy electrons for B+ generation. A helical tungsten filament is used in the HSMS source to obtain a high temperature and provide an axial configuration with a magnetic field of approximately 87.5 mT for the 2.45 GHz electron cyclotron resonance (ECR). The effects of high-temperature surface ionization and ECR ionization were separately evaluated. The magnetic field configuration, microwave power, and air pressure have been studied through this plasma model. A 30% B+ improvement was achieved.
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Key words
Accelerator Applications, Accelerator modelling and simulations (multi-particle dynamics, single-particle dynamics), Accelerator Subsystems and Technologies, Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS))
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