Bragg Detector for Identification of Rare and Exotic Accelerated Ions in Experiments at TRIUMF-ISAC

TRIUMF同位素分离器和加速器第二阶段(ISAC-II)即将向世界上一些研究稀有原子核物理的最尖端仪器提供前所未有的强度，这些最奇异的原子核在自然界中最猛烈的恒星事件中只存在数十毫秒。制备和输送技术导致束流包含不止一种物质，也就是具有感兴趣的外来核和具有相同质量电荷比的离子的“鸡尾酒”。为了使ISAC-II实验最有效，需要一种方法来识别“鸡尾酒”的各种成分。我们提出了一种紧凑和相对简单的装置，称为布拉格探测器。该设备通过测量光束在气体体积中的能量损失来识别鸡尾酒光束的成分。它将使用数字信号波形读数来处理能量损失分布。我们的设备将基于已经由其中一名团队成员在欧洲进行实验并成功操作的设备的设计。

The TRIUMF Isotope Separator and Accelerator phase 2 (ISAC-II) is on the verge of delivering unprecedented intensities of the most exotic nuclei, those that exist in nature only for tens of milliseconds in the most violent stellar events, to a suite of some of the world's most sophisticated instruments for studying the physics of rare nuclei. The preparation and delivery techniques result in beams containing more than one species, that is, "cocktails" with both the exotic nucleus of interest, and ions with the same mass-to-charge ratio. For ISAC-II experiments to be most effective, a means of identifying the various components of the "cocktail" is needed. We propose a compact and relatively simple device called a Bragg detector. This device identifies the components of a cocktail beam by measuring how the beam loses energy in a gas volume. It will use digital signal waveform readouts to process the energy loss profile. Our device will be based on the design of one that was already built and operated successfully by one of the team members for experiments in Europe.