TITAN的数字式RFQ离子束冷却器和聚束器、操作和性能
TITAN's Digital RFQ Ion Beam Cooler and Buncher, Operation and Performance
摘要：
我们提出了一个描述的射频四极杆（四极杆）离子阱作为泰坦设施的一部分。它由一个充气的、分段的、线性的保罗阱组成，是TITAN装置的第一级，目的是冷却和聚束ISAC-TRIUMF提供的放射性离子束。这是第一个数字驱动的此类设备，即，与典型的正弦波形式相比，使用高电压（$V_{pp} = \rm{400 \, V}$）、宽带宽（$0.2 < f < 1.2 \, \rm{MHz}$）方波。从调试的设备，以及稳定和放射性离子的系统研究的结果，包括效率测量与稳定的$^{133}$ Cs和放射性$^{124, 126}$ Cs。还展示了该设备的新颖且独特的操作模式，其中以反向模式提取冷却的离子束，即，与先前注入的方向相同。
英文摘要：
We present a description of the Radio Frequency Quadrupole (RFQ) ion trap built as part of the TITAN facility. It consists of a gas-filled, segmented, linear Paul trap and is the first stage of the TITAN setup with the purpose of cooling and bunching radioactive ion beams delivered from ISAC-TRIUMF. This is the first such device to be driven digitally, i.e., using a high voltage ($V_{pp} = \rm{400 \, V}$), wide bandwidth ($0.2 < f < 1.2 \, \rm{MHz}$) square-wave as compared to the typical sinusoidal wave form. Results from the commissioning of the device as well as systematic studies with stable and radioactive ions are presented including efficiency measurements with stable $^{133}$Cs and radioactive $^{124, 126}$Cs. A novel and unique mode of operation of this device is also demonstrated where the cooled ion bunches are extracted in reverse mode, i.e., in the same direction as previously injected.
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