Speaker
Description
In high-intensity proton accelerators such as the China Spallation Neutron Source (CSNS), emittance control in the low-energy beam transport (LEBT) section is essential for improving beam quality and achieving high transmission efficiency. The electrostatic beam chopper originally installed in the CSNS LEBT has been shown to increase beam emittance by disrupting space charge compensation (SCC). To address this issue, a novel chopper scheme featuring a faster rising edge with minimized SCC destruction is proposed and experimentally tested. Furthermore, barrier electrodes are introduced to axially confine compensation ions by shielding the effect of local potential well. Both experimental measurements and simulations demonstrate that the barrier electrodes effectively suppress beam emittance growth. These findings provide effective strategies for high-intensity beam transport with fast chopping capability in the LEBT section.
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