Borisyuk Petr V, Derevyashkin Sergey P, Khabarova Ksenia Y, Kolachevsky Nikolay N, Lebedinsky Yury Y, Poteshin Sergey S, Sysoev Alexey A, Tkalya Evgeny V, Tregubov Dmitry O, Troyan Viktor I, Vasiliev Oleg S, Yakovlev Valery P, Yudin Valery I
1 National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia.
2 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia.
Eur J Mass Spectrom (Chichester). 2017 Aug;23(4):146-151. doi: 10.1177/1469066717720906.
We describe an original multisectional quadrupole ion trap aimed to realize nuclear frequency standard based on the unique isomer transition in thorium nucleus. It is shown that the system effectively operates on Th, Th and Th ions produced by laser ablation of metallic thorium-232 target. Laser intensity used for ablation is about 6 GW/cm. Via applying a bias potential to every control voltage including the RF one, we are able not only to manipulate ions within the energy range as wide as 1-500 eV but to specially adjust trap potentials in order to work mainly with ions that belong to energy distribution maximum and therefore to effectively enhance the number of trapped ions. Measurement of energy distributions of Th, Th, Th ions obtained by laser ablation allows us to define optimal potential values for trapping process. Observed number of ions inside trap in dependence on trapping time is found to obey an unusually slow - logarithmic decay law that needs more careful study.
我们描述了一种原创的多段式四极离子阱，旨在基于钍核中独特的异构体跃迁实现核频率标准。结果表明，该系统能有效地作用于通过激光烧蚀金属钍 - 232靶产生的钍、钍和钍离子。用于烧蚀的激光强度约为6 GW/cm²。通过对包括射频电压在内的每个控制电压施加偏置电位，我们不仅能够在1 - 500 eV的宽能量范围内操纵离子，还能特别调整阱电位，以便主要处理属于能量分布最大值的离子，从而有效增加捕获离子的数量。对通过激光烧蚀获得的钍、钍、钍离子的能量分布进行测量，使我们能够确定捕获过程的最佳电位值。观察到阱内离子数量随捕获时间的变化遵循一种异常缓慢的对数衰减规律，这需要更仔细的研究。
