The development of radiation sources in the THzudspectral region has become more and more interestingudbecause of the peculiar characteristics of this radiation: itudis non ionizing, it penetrates dielectrics, it is highlyudabsorbed by polar liquids, highly reflected by metals andudreveals specific "fingerprint" absorption spectra arisingudfrom fundamentals physical processes.udThe THz source at SPARC is an accelerator basedudsource for research investigations (e.g. material science,udbiology fields).udBy means of e-beam manipulation technique, audlongitudinal modulated beam, the so-called comb beam,udcan be produced at SPARC. In terms of THz sources,udsuch e-beam distribution allows to produce high intensitiyudnarrow band THz radiation, whose spectrum stronglyuddepends on the charge distribution inside the e-beam.udIn this paper different linac schemes are compared. Inudparticular, spectra obtained using the comb beamudcompression through velocity bunching including a IVudharmonic RF section is showed.
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机译：太赫兹超光谱区域的辐射源的发展变得越来越有趣因为这种辐射的特殊特性：它辐射非电离，它穿透电介质，它被极性液体高度吸收，被金属高度反射 ud揭示了由基本物理过程产生的特定“指纹”吸收光谱。 ud SPARC的THz源是基于加速器的 udsource，用于研究（例如材料科学， udbiology领域）。 ud通过电子束操纵技术可以在SPARC上产生纵向调制光束，即所谓的梳状光束。在太赫兹源方面，这种电子束分布可以产生高强度的窄带太赫兹辐射，其光谱强烈地依赖于电子束内部的电荷分布。本文对不同的直线加速器方案进行了比较。特别地，示出了使用梳束减压通过包括IV 超声波RF截面的速度成束获得的光谱。
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