Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak

R. Manchanda; J. Ghosh; P. K. Chattopadhyay; M. B. Chowdhuri; Santanu Banerjee; N. Ramasubramanian; Ketan M. Patel; Vinay Kumar; P. Vasu; R. L. Tanna; B. Paradkar; C. N. Gupta; S. B. Bhatt; D. Raju; R. Jha; P. K. Atrey; S. Joisa; C. V.S. Rao; Y. C. Saxena

doi:10.1063/1.3461165

Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak

R. Manchanda
, J. Ghosh
, P. K. Chattopadhyay
, M. B. Chowdhuri
, Santanu Banerjee
, N. Ramasubramanian
, Ketan M. Patel
, Vinay Kumar
, P. Vasu
, R. L. Tanna
, B. Paradkar
, C. N. Gupta
, S. B. Bhatt
, D. Raju
, R. Jha
, P. K. Atrey
, S. Joisa
, C. V.S. Rao
, Y. C. Saxena

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

In Aditya tokamak [S. B. Bhatt Indian J. Pure Appl. Phys. 27, 710 (1989)], an increase in the H_α and C2+ intensity fluctuations from the edge region is observed with an increase in the magnetohydrodynamic (MHD) activity. Very small fluctuation amplitudes of H_α and C2+ intensity are observed in discharges where there is no MHD activity compared to the discharges with MHD activity. These fluctuations in the H_α and C2+, measured by optical filter-photomultiplier tube combination-are modulated by Mirnov oscillations having a dominant peak with a common frequency ∼7-10 kHz. Further investigation reveals the presence of strong coherent fluctuations in density and floating potential at same frequency as well. These observations indicate the existence of a nonelectrostatic instability, which may be based on the coupled mode of the drift mode and the Alfven mode. The coherent density fluctuations give rise to the experimentally observed coherent H_α and C2+ intensity fluctuations.

Original language	English (US)
Article number	072515
Journal	Physics of Plasmas
Volume	17
Issue number	7
DOIs	https://doi.org/10.1063/1.3461165
State	Published - Jul 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.3461165

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Manchanda, R., Ghosh, J., Chattopadhyay, P. K., Chowdhuri, M. B., Banerjee, S., Ramasubramanian, N., Patel, K. M., Kumar, V., Vasu, P., Tanna, R. L., Paradkar, B., Gupta, C. N., Bhatt, S. B., Raju, D., Jha, R., Atrey, P. K., Joisa, S., Rao, C. V. S., & Saxena, Y. C. (2010). Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak. Physics of Plasmas, 17(7), Article 072515. https://doi.org/10.1063/1.3461165

@article{bdaf2b65dacc4470a4f3fbe9dc524d34,

title = "Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak",

abstract = "In Aditya tokamak [S. B. Bhatt Indian J. Pure Appl. Phys. 27, 710 (1989)], an increase in the Hα and C2+ intensity fluctuations from the edge region is observed with an increase in the magnetohydrodynamic (MHD) activity. Very small fluctuation amplitudes of Hα and C2+ intensity are observed in discharges where there is no MHD activity compared to the discharges with MHD activity. These fluctuations in the Hα and C2+, measured by optical filter-photomultiplier tube combination-are modulated by Mirnov oscillations having a dominant peak with a common frequency ∼7-10 kHz. Further investigation reveals the presence of strong coherent fluctuations in density and floating potential at same frequency as well. These observations indicate the existence of a nonelectrostatic instability, which may be based on the coupled mode of the drift mode and the Alfven mode. The coherent density fluctuations give rise to the experimentally observed coherent Hα and C2+ intensity fluctuations.",

author = "R. Manchanda and J. Ghosh and Chattopadhyay, \{P. K.\} and Chowdhuri, \{M. B.\} and Santanu Banerjee and N. Ramasubramanian and Patel, \{Ketan M.\} and Vinay Kumar and P. Vasu and Tanna, \{R. L.\} and B. Paradkar and Gupta, \{C. N.\} and Bhatt, \{S. B.\} and D. Raju and R. Jha and Atrey, \{P. K.\} and S. Joisa and Rao, \{C. V.S.\} and Saxena, \{Y. C.\}",

year = "2010",

month = jul,

doi = "10.1063/1.3461165",

language = "English (US)",

volume = "17",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "7",

}

Manchanda, R, Ghosh, J, Chattopadhyay, PK, Chowdhuri, MB, Banerjee, S, Ramasubramanian, N, Patel, KM, Kumar, V, Vasu, P, Tanna, RL, Paradkar, B, Gupta, CN, Bhatt, SB, Raju, D, Jha, R, Atrey, PK, Joisa, S, Rao, CVS & Saxena, YC 2010, 'Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak', Physics of Plasmas, vol. 17, no. 7, 072515. https://doi.org/10.1063/1.3461165

TY - JOUR

T1 - Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak

AU - Manchanda, R.

AU - Ghosh, J.

AU - Chattopadhyay, P. K.

AU - Chowdhuri, M. B.

AU - Banerjee, Santanu

AU - Ramasubramanian, N.

AU - Patel, Ketan M.

AU - Kumar, Vinay

AU - Vasu, P.

AU - Tanna, R. L.

AU - Paradkar, B.

AU - Gupta, C. N.

AU - Bhatt, S. B.

AU - Raju, D.

AU - Jha, R.

AU - Atrey, P. K.

AU - Joisa, S.

AU - Rao, C. V.S.

AU - Saxena, Y. C.

PY - 2010/7

Y1 - 2010/7

N2 - In Aditya tokamak [S. B. Bhatt Indian J. Pure Appl. Phys. 27, 710 (1989)], an increase in the Hα and C2+ intensity fluctuations from the edge region is observed with an increase in the magnetohydrodynamic (MHD) activity. Very small fluctuation amplitudes of Hα and C2+ intensity are observed in discharges where there is no MHD activity compared to the discharges with MHD activity. These fluctuations in the Hα and C2+, measured by optical filter-photomultiplier tube combination-are modulated by Mirnov oscillations having a dominant peak with a common frequency ∼7-10 kHz. Further investigation reveals the presence of strong coherent fluctuations in density and floating potential at same frequency as well. These observations indicate the existence of a nonelectrostatic instability, which may be based on the coupled mode of the drift mode and the Alfven mode. The coherent density fluctuations give rise to the experimentally observed coherent Hα and C2+ intensity fluctuations.

AB - In Aditya tokamak [S. B. Bhatt Indian J. Pure Appl. Phys. 27, 710 (1989)], an increase in the Hα and C2+ intensity fluctuations from the edge region is observed with an increase in the magnetohydrodynamic (MHD) activity. Very small fluctuation amplitudes of Hα and C2+ intensity are observed in discharges where there is no MHD activity compared to the discharges with MHD activity. These fluctuations in the Hα and C2+, measured by optical filter-photomultiplier tube combination-are modulated by Mirnov oscillations having a dominant peak with a common frequency ∼7-10 kHz. Further investigation reveals the presence of strong coherent fluctuations in density and floating potential at same frequency as well. These observations indicate the existence of a nonelectrostatic instability, which may be based on the coupled mode of the drift mode and the Alfven mode. The coherent density fluctuations give rise to the experimentally observed coherent Hα and C2+ intensity fluctuations.

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DO - 10.1063/1.3461165

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SN - 1070-664X

VL - 17

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 7

M1 - 072515

ER -

Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak

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