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Initial results from near-infrared spectroscopy on ADITYA-U tokamak.
Ramaiya, N; Manchanda, R; Chowdhuri, M B; Yadava, N; Dey, R; Kumar, A; Shah, K; Patel, S; Jadeja, K A; Patel, K M; Kumar, R; Aich, S; Pathak, S K; Tanna, R L; Ghosh, J.
Afiliação
  • Ramaiya N; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Manchanda R; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Chowdhuri MB; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Yadava N; Institute of Science, Nirma University, Ahmedabad 382 481, India.
  • Dey R; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Kumar A; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Shah K; Department of Physics, Pandit Deendayal Energy University, Raisan, Gandhinagar 382 007, India.
  • Patel S; Department of Physics, Pandit Deendayal Energy University, Raisan, Gandhinagar 382 007, India.
  • Jadeja KA; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Patel KM; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Kumar R; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Aich S; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Pathak SK; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Tanna RL; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
  • Ghosh J; Institute for Plasma Research, Bhat, Gandhinagar 382 428, India.
Rev Sci Instrum ; 93(11): 113552, 2022 Nov 01.
Article em En | MEDLINE | ID: mdl-36461425
Spectroscopy in vacuum ultraviolet (VUV) and visible ranges plays an important role in the investigation and diagnosis of tokamak plasmas. However, under harsh environmental conditions of fusion grade devices, such as ITER, VUV-visible systems encounter many issues due to the degradation of optical components used in such systems. Here, near-infrared (NIR) spectroscopy has become an effective tool in understanding the edge plasma dynamics. Considering its importance, a NIR spectroscopic diagnostic has been developed and installed on the ADITYA-U tokamak. The system consists of a 0.5 m spectrometer having three gratings with different groove densities, and it is coupled with a linear InGaAs photodiode array. Radiation from the ADITYA-U edge plasma has been collected using a collimating lens and optical fiber combination and transported to the spectrometer. The spectrum in the NIR range from the ADITYA-U plasma has been recorded using this system, in which Paß and Paγ along with many spectral lines from neutral and singly ionized impurities have been observed. The influxes of H and C have been estimated from measurements. The H influx value is found to be 2.8 × 1016 and 1.9 × 1016 particles cm-2 s-1 from neutral hydrogen lines Hα and Paß, respectively, and the C influx value is found to be 3.5 × 1015 and 2.9 × 1015 particles cm-2 s-1 from the neutral carbon and singly ionized carbon, respectively. A good agreement is seen between these results and the results obtained by using a routine photomultiplier tube based diagnostic.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article