Lange M, Froese M, Menk S, Varju J, Bastert R, Blaum K, López-Urrutia J R Crespo, Fellenberger F, Grieser M, von Hahn R, Heber O, Kühnel K-U, Laux F, Orlov D A, Rappaport M L, Repnow R, Schröter C D, Schwalm D, Shornikov A, Sieber T, Toker Y, Ullrich J, Wolf A, Zajfman D
Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany.
Rev Sci Instrum. 2010 May;81(5):055105. doi: 10.1063/1.3372557.
We report on the realization and operation of a fast ion beam trap of the linear electrostatic type employing liquid helium cooling to reach extremely low blackbody radiation temperature and residual gas density and, hence, long storage times of more than 5 min which are unprecedented for keV ion beams. Inside a beam pipe that can be cooled to temperatures <15 K, with 1.8 K reached in some locations, an ion beam pulse can be stored at kinetic energies of 2-20 keV between two electrostatic mirrors. Along with an overview of the cryogenic trap design, we present a measurement of the residual gas density inside the trap resulting in only 2 x 10(3) cm(-3), which for a room temperature environment corresponds to a pressure in the 10(-14) mbar range. The device, called the cryogenic trap for fast ion beams, is now being used to investigate molecules and clusters at low temperatures, but has also served as a design prototype for the cryogenic heavy-ion storage ring currently under construction at the Max-Planck Institute for Nuclear Physics.
我们报告了一种线性静电式快速离子束阱的实现与运行情况，该阱采用液氦冷却以达到极低的黑体辐射温度和残余气体密度，从而实现了超过5分钟的长存储时间，这对于keV离子束来说是前所未有的。在一个可冷却至温度低于15K（某些位置可达1.8K）的束流管道内，一个离子束脉冲可以被存储在两个静电镜之间，动能为2 - 20keV。除了对低温阱设计的概述，我们还给出了阱内残余气体密度的测量结果，仅为2×10³ cm⁻³，在室温环境下这对应于10⁻¹⁴ mbar范围内的压力。该装置被称为快速离子束低温阱，目前正用于低温下对分子和团簇的研究，但它也作为马克斯·普朗克核物理研究所正在建造的低温重离子存储环的设计原型。
