Han B X, Kalvas T, Tarvainen O, Welton R F, Murray S N, Pennisi T R, Santana M, Stockli M P
Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Rev Sci Instrum. 2012 Feb;83(2):02B727. doi: 10.1063/1.3681125.
The H(-) injector consisting of a cesium enhanced RF-driven ion source and a 2-lens electrostatic low-energy beam transport (LEBT) system supports the spallation neutron source 1 MW beam operation with ∼38 mA beam current in the linac at 60 Hz with a pulse length of up to ∼1.0 ms. In this work, two important issues associated with the low-energy beam transport are discussed: (1) inconsistent dependence of the post-radio frequency quadrupole accelerator beam current on the ion source tilt angle and (2) high power beam losses on the LEBT electrodes under some off-nominal conditions compromising their reliability.
由铯增强射频驱动离子源和双透镜静电低能束流传输（LEBT）系统组成的H(-)注入器，支持散裂中子源在直线加速器中以60Hz、脉冲长度高达约1.0ms的情况下，实现1MW束流运行，束流电流约为38mA。在这项工作中，讨论了与低能束流传输相关的两个重要问题：（1）射频四极加速器束流电流对离子源倾斜角的依赖不一致；（2）在某些非标称条件下，LEBT电极上的高功率束流损失会影响其可靠性。
