Speaker
Description
Lifetime and emittance are two key parameters for an RF-driven H$^-$ source used in high-power proton accelerators. At the China Spallation Neutron Source (CSNS), we have developed a high-intensity RF-driven H$^-$ ion source with an external antenna structure, capable of generating a beam current exceeding 60 mA. To extend the lifetime of the ion source, improvements have been made over the past several years to the plasma chamber structure, gas purification system, and cesium injection setup. Following these optimizations, a single plasma chamber has accumulated over 1,200 operation days, demonstrating nearly unlimited lifetime. To improve beam transmission through the radio-frequency quadrupole (RFQ), the emittance of the ion beam in the low-energy beam transport (LEBT) section has been minimized to 0.21 $\pi\cdot$mm$\cdot$mrad at a beam current of 60 mA. The study shows that not only the ion source parameters but also the solenoid configuration and space charge compensation play important roles in achieving emittance minimization.
| Email address | chenwd@ihep.ac.cn |
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| Funding Agency | Guangdong Basic and Applied Basic Research Foundation (Grant No. 2024B1515120028) |
| Visitor's Visa | yes |
| Classification | H- and D- sources for fusion, accelerators and other applications |