Construction and commissioning of the compact energy-recovery linac at KEK
Construction and commissioning of the compact energy-recovery linac at KEK
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DOI：
10.1016/j.nima.2017.08.051
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发表时间：
2018-01-01
影响因子：
1.4
通讯作者：
Yamamoto, Masahiro
中科院分区：
文献类型：
--
作者：
Akemoto, Mitsuo;Arakawa, Dai;Yamamoto, Masahiro
能量回收直线加速器（ERLs）在先进的同步加速器光源、高功率自由电子激光器（FELs）、高亮度伽玛射线源和电子-离子对撞机中具有广阔的应用前景。为了演示基于ERL光源的关键技术，我们设计并建造了一个测试加速器，紧凑型ERL （cERL）。cERL采用先进技术，包括光电阴极直流电（DC）电子枪和两种1.3 ghz频率的超导腔，设计成能够在回收束流能量的同时再循环低发射度（= 10 mA）电子束。在初始调试期间，cERL成功地实现了高质量光束的再循环，其归一化横向发射度接近0.14 mm. mrad，动量扩散接近1.2 x 10(-4) (rms)，光束能量为20 MeV，束荷低于100 fC。对于大平均电流连续波束，超导直线加速器的能量回收也得到了证明。这些结果是实现基于erl光源的重要里程碑。(C) 2017 Elsevier B.V.版权所有
Energy-recovery linacs (ERLs) are promising for advanced synchrotron light sources, high-power free electron lasers (FELs), high-brightness gamma-ray sources, and electron-ion colliders. To demonstrate the critical technology of ERL-based light sources, we have designed and constructed a test accelerator, the compact ERL (cERL). Using advanced technology that includes a photocathode direct current (DC) electron gun and two types of 1.3-GHz-frequency superconducting cavities, the cERL was designed to be capable of recirculating low emittance (= 10 mA) electron beams while recovering the beam energy. During initial commissioning, the cERL demonstrated successful recirculation of high-quality beams with normalized transverse emittance of similar to 0.14 mm. mrad and momentum spread of similar to 1.2 x 10(-4) (rms) at a beam energy of 20 MeV and bunch charge below 100 fC. Energy recovery in the superconducting main linac was also demonstrated for high-average-current continuous-wave beams. These results constitute an important milestone toward realizing ERL-based light sources. (C) 2017 Elsevier B.V. All rights reserved.