Prototype internal target design for storage ring experiments
Prototype internal target design for storage ring experiments
复制标题
用于存储环实验的原型内部目标设计
DOI：
10.1088/0031-8949/2015/t166/014051
复制
发表时间：
2015
期刊：
影响因子：
2.9
通讯作者：
T. Stöhlker
中科院分区：
文献类型：
--
作者：
N. Petridis;R. Grisenti;Y. Litvinov;T. Stöhlker
低温冷却，几微米大小的喷嘴几何形状的引入以及实验存储环（ESR）目标站的基本修改允许在1013-1014 cm−2范围内的目标区域密度范围内使用低z气体进行可靠的操作。因此，建立了一个非常通用的目标源，可以在所需的目标气体（从H2到Xe）和面积密度（~ 1010到~ 1014 cm−2）的整个范围内操作。此外，新目标源的孔径相当小，可以使入口腔更加紧凑，同时保持存储环的严格真空要求。本文提出了一种全新的入口室设计，除了可实现的面积密度方面的改进外，还将在离子束相互作用区域采用可变的光束宽度，最小可达1mm。这对于实现高精度实验是至关重要的，例如，通过减少观测角度的不准确性导致相对论性多普勒展宽。在SPARC合作的未来高能量储存环中部署的同时，新的入口室也可以取代ESR中的当前入口室，或者作为CRYRING的内部目标。
The introduction of cryogenically cooled, few micrometer-sized nozzle geometries and an essential modification of the experimental storage ring (ESR) target station allowed for a reliable operation using low-Z gases at target area densities in the range of 1013–1014 cm−2. Therefore, a remarkably versatile target source was established, enabling operation over the whole range of desired target gases (from H2 to Xe) and area densities (∼1010 to ∼1014 cm−2). Moreover, the considerably smaller orifice diameter of the new target source enables a much more compact inlet chamber while, at the same time, maintaining the demanding vacuum requirements of a storage ring. A completely new inlet chamber design is presented here, which, besides the improvements regarding the achievable area densities, will feature a variable beam width down to 1 mm at the ion beam interaction region. This is of paramount importance with respect to the realization of high precision experiments, e.g. by reducing the inaccuracy of the observation angle causing the relativistic Doppler broadening. While being intended for the deployment at the future high energy storage ring within the SPARC collaboration, the new inlet chamber can also replace the current one at the ESR or serve as an internal target for CRYRING.