Initial beam emission spectroscopy diagnostic system on HL-2A tokamak
- Tsinghua Univ., Beijing (China); Southwestern Inst. of Physics (China)
- Southwestern Inst. of Physics (China); Univ. of Wisconsin, Madison, WI (United States); Hefei Univ. of Technology (China)
- Univ. of Wisconsin, Madison, WI (United States)
- Southwestern Inst. of Physics (China)
A beam emission spectroscopy system is being developed and deployed on the HL-2A tokamak to measure local low wavenumber (k⊥ρi < 1) density fluctuations by measuring the Doppler-shifted emission from a 50 kV deuterium heating neutral beam. High spatial resolution (Δr ≤ 1 cm, Δz ≤ 1.5 cm) measurements are achieved with customized in-vacuum optics. High frequency, high-gain preamplifiers sample the light intensity at a Nyquist frequency of 1 MHz and achieve a high S/N ratio via high optical throughput, low-noise preamplifiers, and high quantum efficiency photodiodes. A first set of 16 detector channels [configured in an 8 (radial) × 2 (poloidal) array] has been installed and tested at HL-2A, covering the radial range r/a = 0.8–1.1. The frequency and wavenumber spectra have been measured under different plasma conditions. Initial measurements have demonstrated the capability of measuring edge plasma density fluctuation spectra and the poloidal flow velocity fields with a high S/N ratio.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- FG02-08ER54999
- OSTI ID:
- 1610029
- Alternate ID(s):
- OSTI ID: 1476686
- Journal Information:
- Review of Scientific Instruments, Vol. 89, Issue 10; Conference: 22. Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), 16-18 Apr 2018; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Overview of HL-2A recent experiments
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journal | July 2019 |
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