Schwarz S, Bollen G, Kostin M, Marti F, Zavodszky P, Crespo López-Urrutia J R, Dilling J, Kester O
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA.
Rev Sci Instrum. 2008 Feb;79(2 Pt 2):02A706. doi: 10.1063/1.2801346.
Reacceleration of low-energy rare isotope beams available from gas stopping of fast-fragment beams or from an ISOL target station to energies in the range of 0.3-12 MeV/nucleon is needed for experiments such as low-energy Coulomb excitation and transfer reaction studies and for the precise study of astrophysical reactions. The implementation of charge breeding as a first step in a reaccelerator is a key to obtaining a compact and cost-efficient reacceleration scheme. For highest efficiency it is essential that single charge states are obtained in a short breeding time. A low-emittance beam must be delivered. An electron beam ion trap (EBIT) has the potential to meet these requirements. An EBIT-based charge breeder is presently under design and construction at the NSCL as part of the construction of a reaccelerator for stopped beams from projectile fragmentation. This new facility will have the potential to provide low-energy rare isotope beams not yet available elsewhere.
对于诸如低能库仑激发和转移反应研究以及天体物理反应的精确研究等实验而言，需要将通过快速碎片束的气体慢化或从一个同位素分离靶站获得的低能稀有同位素束再加速到0.3 - 12兆电子伏特每核子的能量范围。在再加速器中，将电荷增殖作为第一步实施，是获得紧凑且经济高效的再加速方案的关键。为实现最高效率，必须在短的增殖时间内获得单一电荷态。必须传输低发射度束流。电子束离子阱（EBIT）有潜力满足这些要求。作为用于弹丸碎裂产生的慢化束的再加速器建设的一部分，基于EBIT的电荷增殖器目前正在美国国家超导回旋加速器实验室（NSCL）进行设计和建造。这个新设施将有潜力提供其他地方尚未有的低能稀有同位素束。
