论文标题
高电流$ \ mathrm {h} _2^+$ $ beams来自细丝驱动的多速率离子源
High current $\mathrm{H}_2^+$ beams from a filament-driven multicusp ion source
论文作者
论文摘要
最近，使用$ \ mathrm {h} _2^+$ ions而不是质子来克服紧凑型环体中的空间充电挑战，这引起了很多关注。该技术有可能通过数量级从紧凑型环体中增加可用的束电流，为能源研究，医疗同位素生产和粒子物理的应用铺平了道路，例如通过ISODAR实验对无菌中微子的决定性搜索。对于ISODAR，我们不仅使用$ \ mathrm {h} _2^+$迈出了一步，还可以通过嵌入在Cyclotron Yoke中的射频频率四极杆（RFQ）添加预捆式。这将光束的纯度和光束质量约束放在离子源上，该离子源没有发表的离子源同时证明了迄今为止。在这里，我们报告了一种新的多频率离子源（MIST-1）的结果，该结果产生了从这种类型的离子源（1 MA）中产生$ \ mathrm {h} _2^+$的$ \ MATHRM {H} _2^+$的结果，具有异常低的发射率（0.05 $π$ -Mmm -mmm-mm-mm-mmrad，rms，rmms，rormalized）和高纯度（80％$ $）$ $ ____________2+\ $}+rm {该结果显示了使用ISODAR和RFQ直接注入原型的多频率离子源的可行性，并铺平了记录突破连续波（CW）束电流（CW）5 mA $ $ \ MATHRM {H} _2 _2^+$（等于10 MA Protons）的可行性。这代表了一个重大的进步，对中微子物理学的影响和高功率回旋加成了一般的影响。
Recently, the use of $\mathrm{H}_2^+$ ions instead of protons to overcome space charge challenges in compact cyclotrons has received much attention. This technique has the potential to increase the available beam current from compact cyclotrons by an order of magnitude, paving the way for applications in energy research, medical isotope production, and particle physics, e.g. a decisive search for sterile neutrinos through the IsoDAR experiment. For IsoDAR we go a step beyond just using $\mathrm{H}_2^+$ and add pre-bunching through a Radio-Frequency Quadrupole (RFQ) embedded in the cyclotron yoke. This puts beam purity and beam quality constraints on the ion source that no published ion source has simultaneously demonstrated so far. Here, we report results from a new multicusp ion source (MIST-1) that produces the world's highest steady-state current of $\mathrm{H}_2^+$ from this type of ion source (1 mA), with exceptionally low emittance (0.05 $π$-mm-mrad, RMS, normalized) and high purity (80% $\mathrm{H}_2^+$). This result shows the feasibility of using a multicusp ion source for IsoDAR and the RFQ direct injection prototype, and paves the way to record breaking continuous wave (cw) beam currents of 5 mA $\mathrm{H}_2^+$ (equivalent to 10 mA protons) from compact cyclotrons, ideal for underground installation. This represents a significant advance, with impact on neutrino physics specifically and high power cyclotron design in general.
