Speaker
Description
CEA Paris-Saclay has been engaged for over three decades in developing high-intensity proton and deuteron sources, from the SILHI ECR ion source to large-scale projects such as FAIR, SPIRAL2, and LIPAc. Although these sources meet the required beam performance, continuous operation is limited by BN disk degradation. To enhance compactness, ease maintenance, and reduce beam emittance, a new family of sources, ALISES, has been developed. Design differences between SILHI-like and ALISES sources are presented, along with simulations highlighting the role of non-resonant cavities and evanescent-wave coupling in plasma ignition and sustainment. Experiments revealed similar BN disk degradation patterns in ALISES v3 and LIPAc sources, leading to hypotheses on the underlying mechanisms. Mitigation strategies under study include an improved RF ridged waveguide design to reduce breakdown risk and better match the plasma impedance. Tests with ALISES v3 of a solid-state amplifier replacing the magnetron demonstrated enhanced frequency stability, reduced current ripple and rise time, and precise RF control, offering more favourable operating conditions. These ongoing developments open promising perspectives for improving the long-term reliability of high-intensity ion sources.
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