Sub-THz EM characterization of coated material
DOI:
https://doi.org/10.23732/CYRCP-2020-007.83Abstract
The electromagnetic characterization of coating materials is fundamental to build a reliable impedance model of any accelerator. In particular, since the CLIC (Compact LInear Collider) necessitates bunches with short longitudinal length, a full electromagnetic characterization of the coating material surface impedance is needed at high frequencies in the millimetric wave length and beyond. The goal of this paper is to develop a measurement method to characterize the coating materials in the sub-THz frequency range. The electromagnetic characterization of the material is performed using a time domain coherent THz spectrometer. The method is based on the attenuation measurement of the signal passing through a waveguide specifically designed, having a very thin central layer where the coating material is deposited on both sides. The guide is equipped with two "horn" antennas integrated on both sides of the device to enhance the electromagnetic signal collection. This novel technique is tested on slabs coated with a Non-Evaporable Getter (NEG) and allows evaluating the surface impedance in the frequency range from 0.1 to 0.3 THz.
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