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首页> 外文会议>Advances in X-ray free-electron lasers II: instrumentation >Tunable IR/THz source for pump probe experiments at the European XFEL
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Tunable IR/THz source for pump probe experiments at the European XFEL

机译：可调的IR / THz源，用于欧洲XFEL的泵浦探头实验

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摘要

We present a concept of an accelerator based source of powerful, coherent IR/THz radiation for pump-probe experiments at the European XFEL. The electron accelerator is similar to that operating at the PITZ facility. It consists of an rf gun and a warm accelerating section (energy up to 30 MeV). The radiation is generated in an APPLE-Ⅱ type undulator, thus providing polarization control. Radiation with wavelength below 200 micrometers is generated using the mechanism of SASE FEL. Powerful coherent radiation with wavelength above 200 micrometers is generated in the undulator by a tailored (compressed) electron beam. Properties of the radiation are: wavelength range is 10 to 1000 micrometers (30 THz - 0.3 THz), radiation pulse energy is up to a few hundred microjoule, peak power is 10 to 100 MW, spectrum bandwidth is 2 - 3 %. Pump-probe experiments involving ultrashort electron pulses can be realized as well. The time structure of the THz source and x-ray FEL are perfectly matched since the THz source is based on the same technology as the injector of the European XFEL. A similar scheme can also be realized at LCLS, SACLA, or SWISS FEL with S-band rf accelerator technology.
机译：我们提出了基于加速器的强大，相干IR / THz辐射源的概念，用于欧洲XFEL的泵浦探针实验。电子加速器类似于PITZ设施中的电子加速器。它由一个射频枪和一个温暖的加速部分（能量高达30 MeV）组成。辐射在APPLE-Ⅱ型波荡器中产生，因此提供了偏振控制。使用SASE FEL的机理产生波长小于200微米的辐射。通过定制的（压缩的）电子束在波荡器中产生波长大于200微米的强大的相干辐射。辐射的特性是：波长范围为10到1000微米（30 THz-0.3 THz），辐射脉冲能量高达几百微焦耳，峰值功率为10到100 MW，光谱带宽为2-3％。也可以实现涉及超短电子脉冲的泵浦探针实验。太赫兹源与X射线FEL的时间结构完美匹配，因为太赫兹源采用的技术与欧洲XFEL的注入器相同。在LCLS，SACLA或SWISS FEL的S波段射频加速器技术中也可以实现类似的方案。

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