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A two-beam radio-frequency quadrupole (RFQ) for funnelling of ion beams at low energies

A. Firjahn-Andersch, A. Schempp, J. Madlung, C. Staschok1996年Fusion Engineering and DesignIF 1.7出版社

AbstractIn a heavy ion inertial fusion (HIIF) driver the strongest current limitations are space charge forces in the low energy part of the linac. For this reason the required high current and small emittance ion beam will be reached by several funnelling stages where two identically bunched ion beams are combined into a single beam with twice the frequency, current and brightness. For the first funnelling stage a new two-beam radio-frequency quadrupole (RFQ) could be used where two beams are bunched and accelerated in a single r.f. cavity. The r.f. structure development and the experimental set-up for beam funnelling with He+ will be presented.

日本語訳

重イオン慣性核融合(HIIF)ドライバーにおいて、最も強い電流制限はリニアックの低エネルギー部における空間電荷効果である。このため、要求される高電流・低エミッタンスのイオンビームは、同一にバンチングされた2つのイオンビームを、周波数・電流・輝度が2倍の単一ビームに結合する複数のファンネリング段階によって達成される。最初のファンネリング段階では、単一の高周波空洞内で2つのビームをバンチング・加速する新型の2ビーム高周波四重極(RFQ)が使用され得る。He+を用いたビームファンネリングのための高周波構造の開発と実験装置について発表する。

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