CARIBU: a new facility for the study of neutron-rich isotopes
CARIBU: a new facility for the study of neutron-rich isotopes
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CARIBU：研究富中子同位素的新设施
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
G. Zinkann
中科院分区：
文献类型：
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作者：
G. Savard;R. Pardo;S. Baker;C. Davids;A. Levand;D. Peterson;D. Phillips;T. Sun;R. Vondrasek;B. Zabransky;G. Zinkann
加利福尼亚州稀有离子增殖器升级(Cariu)到ATLAS超导直线加速器设施目前正在投入使用。它提供从252Cf裂变中获得的低能量和再加速的丰中子同位素束流。来自252Cf源的裂变产物在一个大型高强度气体捕集器中停止，通过RFQ冷却器加热和提取，加速到50kV，在高分辨率分离器中进行质量分离，然后通过ATLAS直线加速器送到ECR电荷增殖器进行后加速或送到低能实验区。这种方法提供了非常丰富的中子同位素的束流，其中许多以前在低或库仑势垒能量下是不可用的。这些光束为沿r-工艺路径进行测量提供了独特的机会。为了利用这些独特的可能性，来自Cariu的再加速光束将在ATLAS的实验站上提供，以服务于Gammasphere、HELIOS和反应光谱仪等设备。此外，加拿大彭宁陷阱(CPT)质谱仪已移至Cariu低能实验区，并新建了一条进样线路。新的注入线由一个位于50千伏高压平台上的RFQ聚束器组成，聚束器将积累质量分离的50千伏放射性束流，冷却并将其作为3keV的脉冲束进行提取。这种束流可以被送到磁带站进行诊断和调谐，也可以被送到低温线性捕获器进行准备，然后再传输到高精度的彭宁捕获器，在那里进行质量测量。Cariu的初步调试正在进行中，随着调试的进行，2MCI源将被100MCI源取代。最终的运行将使用1Ci源，对于最强的低能束流，其产额将超过107离子/秒，对于再加速的束流，产额要低一个数量级。
The Californium Rare Ion Breeder Upgrade (CARIBU) to the ATLAS superconducting linac facility is currently being commissioned. It provides low-energy and re-accelerated beams of neutron-rich isotopes obtained from 252Cf fission. The fission products from a 252Cf source are stopped in a large high-intensity gas catcher, thermalized and extracted through an RFQ cooler, accelerated to 50 kV and mass separated in a high-resolution separator before being sent to either an ECR charge breeder for post-acceleration through the ATLAS linac or to a low-energy experimental area. This approach gives access to beams of very neutron-rich isotopes, many of which have not been available at low or Coulomb barrier energies previously. These beams provide unique opportunities for measurements along the r-process path. To take advantage of these unique possibility, the reaccelerated beams from CARIBU will be made available at the experimental stations of ATLAS to serve equipment such as Gammasphere, HELIOS and the reaction spectrometers. In addition, the Canadian Penning Trap (CPT) mass spectrometer has been moved to the CARIBU low-energy experimental area and a new injection line has been built. The new injection line consists of a RFQ buncher sitting on a 50 kV high-voltage platform that will accumulate the mass separated 50 kV radioactive beams, cool and extract them as a pulsed beam of 3 keV. This beam can be sent either to a tape station for diagnostics and tuning, or a cryogenic linear trap for preparation before transfer to the high-precision Penning trap where the mass measurements will take place. Initial CARIBU commissioning is proceeding with a 2 mCi source that will be replaced by a 100 mCi source as the commissioning proceeds. Final operation will use a 1 Ci source and attain yield in excess of 107 ions/sec for the most intense beams at low energy, an order of magnitude less for reaccelerated beams.