Gabor C, Back J J, Faircloth D C, Izaola Z, Lawrie S R, Letchford A P
ASTeC Intense Beams Group, Rutherford Appleton Laboratory, Chilton, Didcot-Oxfordshire OX11 0QX, United Kingdom.
Rev Sci Instrum. 2012 Feb;83(2):02B719. doi: 10.1063/1.3678656.
The Front End Test Stand (FETS) is located at Rutherford Appleton Laboratory and aims for a high current, fast chopped 3 MeV H(-) ion beam suitable for future high power proton accelerators like ISIS upgrade. The main components of the front end are the Penning ion source, a low energy beam transport line, an radio-frequency quadrupole (RFQ) and a medium energy beam transport (MEBT) providing also a chopper section and rebuncher. FETS is in the stage of commissioning its low energy beam transport (LEBT) line consisting of three solenoids. The LEBT has to transport an H(-) high current beam (up to 60 mA) at 65 keV. This is the injection energy of the beam into the RFQ. The main diagnostics are slit-slit emittance scanners for each transversal plane. For optimizing the matching to the RFQ, experiments have been performed with a variety of solenoid settings to better understand the actual beam transport. Occasionally, source parameters such as extractor slit width and beam energy were varied as well. The paper also discusses simulations based on these measurements.
前端测试台（FETS）位于卢瑟福·阿普尔顿实验室，旨在产生适用于未来像ISIS升级这样的高功率质子加速器的高电流、快速斩波的3 MeV H(-)离子束。前端的主要组件包括潘宁离子源、低能束传输线、射频四极杆（RFQ）和中能束传输（MEBT），MEBT还提供一个斩波器部分和再聚束器。FETS正处于调试其由三个螺线管组成的低能束传输（LEBT）线的阶段。LEBT必须传输能量为65 keV的H(-)高电流束（高达60 mA）。这是束流注入RFQ的能量。主要诊断设备是用于每个横向平面的双缝发射度扫描仪。为了优化与RFQ的匹配，已经使用各种螺线管设置进行了实验，以更好地了解实际的束流传输。偶尔也会改变诸如引出狭缝宽度和束流能量等源参数。本文还讨论了基于这些测量的模拟。
