First results on energy recovery in the Jefferson Lab IRFEL

S. Benson, G. Biallas, C. Bohn, I. Campisi, D. Douglas, R. Evans, R. Hill, K. Jordan, G. Krafft, R. Li, L. Merminga, G. Neil, P. Piot, J. Preble, M. Shinn., T. Siggins, R. Walker, B. Yunn
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引用次数: 4

Abstract

A recirculating, energy-recovering linac is used as driver accelerator for Jefferson Lab's high average power FEL. CW beam of 5 mA design current is transported from the superconducting RF (SRF) linac to the wiggler for lasing, and then recirculated back to the linac for deceleration and energy recovery. About 75% of the beam power is extracted before the beam is transported to the beam dump. Energy recovery reduces power consumption, RF equipment capital costs, and beam dump shielding requirements. It is arguably essential as FEL technology is scaled to higher average power levels. To date, 4 mA of CW beam has been energy recovered successfully. There is no evidence of RF instabilities due to the energy aperture of the transport system, momentum compaction or the phase of the decelerating beam. HOM power from the beam has interfered with the operation of the IR interlock detectors, designed to protect the warm waveguide window from thermal runaway. Installation of copper screens appears to have solved the problem. More detailed studies of the HOM spectra and their correlation to the beam properties are planned.
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杰弗逊实验室的第一组能量回收实验结果
杰斐逊实验室的高平均功率自由电子激光器采用了一种循环能量回收直线加速器作为驱动加速器。设计电流为5ma的连续波束从超导RF直线加速器传输到摆动器进行激光,然后再循环到直线加速器进行减速和能量回收。大约75%的束流功率在束流被输送到束流转储之前被提取。能量回收可降低功耗、射频设备资本成本和波束转储屏蔽要求。可以说,随着FEL技术扩展到更高的平均功率水平,这是必不可少的。迄今为止,已成功回收了4ma连续波束的能量。没有证据表明由于输运系统的能量孔径、动量压实或减速光束的相位而导致射频不稳定性。来自光束的HOM功率干扰了红外联锁探测器的操作,该探测器旨在保护热波导窗口免受热失控的影响。安装铜屏似乎已经解决了这个问题。计划对HOM谱及其与光束特性的关系进行更详细的研究。
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