Alessi J G, Barton D, Beebe E, Bellavia S, Gould O, Kponou A, Lambiase R, Lockey R, McNerney A, Mapes M, Marneris Y, Okamura M, Phillips D, Pikin A I, Raparia D, Ritter J, Snydstrup L, Theisen C, Wilinski M
Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
Rev Sci Instrum. 2010 Feb;81(2):02A509. doi: 10.1063/1.3292937.
As part of a new heavy ion preinjector that will supply beams for the Relativistic Heavy Ion Collider and the National Aeronautics and Space Administration Space Radiation Laboratory, construction of a new electron beam ion source (EBIS) is now being completed. This source, based on the successful prototype Brookhaven National Laboratory Test EBIS, is designed to produce milliampere level currents of all ion species, with q/m=(1/6)-(1/2). Among the major components of this source are a 5 T, 2-m-long, 204 mm diameter warm bore superconducting solenoid, an electron gun designed to operate at a nominal current of 10 A, and an electron collector designed to dissipate approximately 300 kW of peak power. Careful attention has been paid to the design of the vacuum system, since a pressure of 10(-10) Torr is required in the trap region. The source includes several differential pumping stages, the trap can be baked to 400 C, and there are non-evaporable getter strips in the trap region. Power supplies include a 15 A, 15 kV electron collector power supply, and fast switchable power supplies for most of the 16 electrodes used for varying the trap potential distribution for ion injection, confinement, and extraction. The EBIS source and all EBIS power supplies sit on an isolated platform, which is pulsed up to a maximum of 100 kV during ion extraction. The EBIS is now fully assembled, and operation will be beginning following final vacuum and power supply tests. Details of the EBIS components are presented.
作为一个将为相对论重离子对撞机和美国国家航空航天局空间辐射实验室提供束流的新型重离子预注入器的一部分，一个新的电子束离子源（EBIS）的建设现已接近尾声。该离子源基于成功的布鲁克海文国家实验室测试EBIS原型设计，旨在产生所有离子种类的毫安级电流，比荷q/m =(1/6)-(1/2)。该离子源的主要部件包括一个5T、2米长、直径204毫米的温孔超导螺线管、一个设计用于在10A标称电流下运行的电子枪以及一个设计用于耗散约300kW峰值功率的电子收集器。由于阱区需要10^(-10)托的压力，因此对真空系统的设计给予了密切关注。该离子源包括几个差分抽气阶段，阱可以加热到400℃，并且在阱区有非蒸散型吸气剂条。电源包括一个15A、15kV的电子收集器电源，以及用于16个电极中大多数电极的快速可切换电源，这些电极用于改变离子注入、约束和引出的阱电位分布。EBIS离子源和所有EBIS电源位于一个隔离平台上，在离子引出期间该平台会被脉冲升压至最高100kV。EBIS现已完全组装完成，将在最终的真空和电源测试之后开始运行。文中介绍了EBIS部件的详细信息。
