BISOL激光共振电离离子源的研制

Development of Resonance Ionization Laser Ion Source for BISOL

摘要: 堆内离子源是北京在线同位素分离丰中子束流装置（BISOL）的主要技术难点之一。为突破堆内离子源关键技术，研制了一台激光共振电离离子源。该离子源源芯为1台电子束碰撞等离子体离子源，通过向离子源内同时馈入三束激光，实现不同核素的激光分步共振电离。激光系统由3台可调谐钛宝石全固态激光器组成，每台钛宝石激光器各自由一台最大功率为20 W的Nd：YAG激光器泵浦。通过向离子源馈入波长分别为286.415、811.630、823.704 nm的三束激光，实现了锡的三步激光共振电离，最大束流强度可达到10 nA。

Abstract: A resonance ionization laser ion source was developed for the key technology research of the radioactive ion source in reactor tube for BISOL (Beijing neutron rich isotope separator on line facility). The ion source was based on a FEBIAD (forced electron beam induced arc discharge) ion source with three all-solid-state tunable Ti: Sapphire lasers. Each Ti: Sapphire laser was pumped by a Nd:YAG laser with the maximum power of 20 W individually. Sn+ ion beam was produced by the three-step resonance ionization scheme of λ₁=286.415 nm, λ₂= 811.630 nm and λ₃= 823.704 nm. The maximum current of Sn⁺ is 10 nA.