Diamond windows diagnostics for fusion reactors—Updates of the design

Mazzocchi, F.; Schreck, S.; Strauß, D.; Aiello, G.; Meier, Andreas; Scherer, T.

doi:10.1016/j.fusengdes.2017.04.012

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Liu and Garin , reported that defects and conduction caused by sp 2 phase are the reasons of dielectric loss at sub-MM wavelength, although the use of PCDs exhibited lowest loss performance. These factors of EMW attenuation have also been confirmed by Heidinger and Polyakov. , Meanwhile, the feasibilities of CVD diamond window prototype in the nuclear fusion system have been conducted. , Further, Yamamoto, et al carried out the evident dielectric loss of a CVD diamond film in the range up to 2.2 THz by THz time-domain spectroscopy (THz-TDS) and predictably suggested that some dielectric response might be presented, and defects (dark features) in the CVD diamond may introduce the THz response. Unceasingly, the transmission properties of a PCD wafer in a wider THz range and application on FEL was preliminarily studied by Kubarev. , …”

Section: Introductionmentioning

confidence: 85%

“…14,23 Meanwhile, the feasibilities of CVD diamond window prototype in the nuclear fusion system have been conducted. 24,25 Further, Yamamoto, et al 26 carried out the evident dielectric loss of a CVD diamond film in the range up to 2.2 THz by THz timedomain spectroscopy (THz-TDS) and predictably suggested that some dielectric response might be presented, and defects (dark features) in the CVD diamond may introduce the THz response. Unceasingly, the transmission properties of a PCD wafer in a wider THz range and application on FEL was preliminarily studied by Kubarev.…”

Section: Introductionmentioning

confidence: 99%

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Doomed Couple of Diamond with Terahertz Frequency: Hyperfine Quality Discrimination and Complex Dielectric Responses of Diamond in the Terahertz Waveband

Zheng

Zhang

Chen

et al. 2020

ACS Appl. Electron. Mater.

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The technology age of terahertz (THz) frequency is coming, with tremendous features and astonishing applications in various fields of science. Using THz time domain spectroscopy, we demonstrate experimentally, for the first time, the fingerprint absorption peaks and the complex dielectric response trends in a 0.1–3 THz frequency waveband, on intentionally synthesized and processed chemical vapor deposition polycrystalline and single-crystal diamond films with systematic quality difference. The two absorption signatures within the 0.1–3 THz frequency band, in which the atomic vibration is material-independent, are attributed to the sp2 phonon vibration modes of as-grown graphitic phases and/or defects. Regarding the complex dielectric responses of diamond in the THz waveband, the scattering effect resulting from the extended grain boundaries associated with concomitant pores (even gaps) (and/or extended crystal cleavage faults associated with amorphous carbon), as well as intrinsic lattice absorption resulting from increased sp2 impurities, have been taken into account. Especially the defect size comparable with the wavelength is also found to have a significant effect on the loss at a higher-frequency electromagnetic wave. These findings are expected to promote not only ultra-sensitive quality diagnosis for diamond but also verification of an ideal transmission material for THz waveband applications.

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