Kondrashev S, Dickerson C, Levand A, Ostroumov P N, Pardo R C, Savard G, Vondrasek R, Alessi J, Beebe E, Pikin A, Kuznetsov G I, Batazova M A
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Rev Sci Instrum. 2012 Feb;83(2):02A902. doi: 10.1063/1.3660823.
Recently, the Californium Rare Isotope Breeder Upgrade (CARIBU) to the Argonne Tandem Linac Accelerator System (ATLAS) was commissioned and became available for production of rare isotopes. Currently, an electron cyclotron resonance ion source is used as a charge breeder for CARIBU beams. To further increase the intensity and improve the purity of neutron-rich ion beams accelerated by ATLAS, we are developing a high-efficiency charge breeder for CARIBU based on an electron beam ion source (EBIS). The CARIBU EBIS charge breeder will utilize the state-of-the-art EBIS technology recently developed at Brookhaven National Laboratory (BNL). The electron beam current density in the CARIBU EBIS trap will be significantly higher than that in existing operational charge-state breeders based on the EBIS concept. The design of the CARIBU EBIS charge breeder is nearly complete. Long-lead components of the EBIS such as a 6-T superconducting solenoid and an electron gun have been ordered with the delivery schedule in the fall of 2011. Measurements of expected breeding efficiency using the BNL Test EBIS have been performed using a Cs(+) surface ionization ion source for external injection in pulsed mode. In these experiments we have achieved ∼70% injection∕extraction efficiency and breeding efficiency into the most abundant charge state of ∼17%.
最近，升级后的阿贡串列直线加速器系统（ATLAS）的锎稀有同位素增殖器（CARIBU）已投入使用，可用于生产稀有同位素。目前，一台电子回旋共振离子源被用作CARIBU束流的电荷增殖器。为了进一步提高ATLAS加速的富中子离子束的强度并改善其纯度，我们正在开发一种基于电子束离子源（EBIS）的用于CARIBU的高效电荷增殖器。CARIBU EBIS电荷增殖器将采用布鲁克海文国家实验室（BNL）最近开发的最先进的EBIS技术。CARIBU EBIS阱中的电子束电流密度将显著高于基于EBIS概念的现有运行电荷态增殖器中的电流密度。CARIBU EBIS电荷增殖器的设计已基本完成。EBIS的长周期部件，如一个6特斯拉的超导螺线管和一个电子枪，已订购，交货时间定在2011年秋季。已使用Cs(+)表面电离离子源以脉冲模式进行外部注入，利用BNL测试EBIS对预期的增殖效率进行了测量。在这些实验中，我们实现了约70%的注入/提取效率以及约17%的增殖效率至最丰富电荷态。
