The development of ultracompact particle accelerators and accelerator-based high-power THz generators are some of the top priorities for research and development programs around the world. These tools require the development of accelerating structures, operating in the mm-Wave and THz range, where diagnostics are not available or are insufficient. This article presents the design of a pulse-to-pulse THz spectrometer, primarily developed for diagnostics of accelerating structures and THz radiation sources. In particular, this spectrometer can be used to detect RF pulse shortening caused by vacuum breakdown and beam misalignment in THz accelerators, as well as for bunch length monitoring and radiation source diagnostics. The spectrometer is based on a diffraction grating and is capable of covering a frequency range where RF-based breakdown measurements are not possible. We have built and tested the first prototype with different sources in a frequency range of 0.1–1.0 THz. In this article, we present the physical design, supported numerical simulations, electronics development, and test results.

中文翻译：

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具有太赫兹和毫米波信号脉冲到脉冲分辨率的光谱仪

超紧凑型颗粒加速器和基于加速器的大功率太赫兹发生器的开发是世界范围内研发计划的首要任务。这些工具需要开发在毫米波和太赫兹范围内运行的加速结构，在这些情况下，无法进行诊断或诊断不足。本文介绍了一种脉冲至脉冲太赫兹光谱仪的设计，该仪器主要用于诊断加速结构和太赫兹辐射源。特别是，该光谱仪可用于检测由于太赫兹加速器中的真空击穿和光束未对准而引起的RF脉冲缩短，以及用于束长监控和辐射源诊断。该光谱仪基于衍射光栅，能够覆盖无法进行基于RF的击穿测量的频率范围。我们已经构建并测试了第一个原型，该原型在0.1–1.0 THz的频率范围内具有不同的信号源。在本文中，我们介绍了物理设计，支持的数值模拟，电子产品开发和测试结果。