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）即将向一套世界上最复杂的仪器提供前所未有的最奇异核强度，这些核在自然界中最剧烈的恒星事件中只存在数十毫秒。这些仪器用于研究稀有核的物理学。这种制备和输送技术产生了包含不止一种物质的光束，也就是说，既含有感兴趣的外来核，又含有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，需要一种确定“鸡尾酒”的各种成分的方法。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。该装置通过测量光束在气体体积中损失能量的方式来识别鸡尾酒光束的成分。它将使用数字信号波形读出来处理能量损失剖面。我们的设备将基于一个已经建成的设备的设计，这个设备是由团队的一个成员在欧洲进行实验时成功运行的。

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.