Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations


Uzun-Kaymak I. U. , Fonck R. J. , McKee G. R. , Schoenbeck N., Smith D., Winz G., ...Daha Fazla

REVIEW OF SCIENTIFIC INSTRUMENTS, cilt.81, sa.10, 2010 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 81 Konu: 10
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1063/1.3479114
  • Dergi Adı: REVIEW OF SCIENTIFIC INSTRUMENTS

Özet

A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near lambda = 529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 mu s is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of delta T-i/T-i <= 1%. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479114]