Skip to main content
SpringerLink
Log in

Evolution of the Plasma Potential During Transitions to Improved Confinement Modes

  • Chapter
  • First Online:
Electric Potential in Toroidal Plasmas

Part of the book series: Springer Series in Plasma Science and Technology ((SSPST))

Abstract

This Chapter discusses variations of the plasma potential and turbulence during transitions to improved confinement modes in T-10 and TJ-II, both driven by the edge biasing or occurring spontaneously.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Log in via an institution
eBook
USD 16.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Hardcover Book
USD 129.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  1. Van Oost, G., Adámek, J., Antoni, V., et al.: Turbulent transport reduction by E × B velocity shear during edge plasma biasing: recent experimental results. Plasma Phys. Control. Fusion 45, 621 (2003)

    Article  ADS  Google Scholar 

  2. Taylor, R.L., Brown, M.L., Fried, B.D., et al.: H-mode behavior induced by cross-field currents in a tokamak. Phys. Rev. Lett. 63, 2365 (1989)

    Article  ADS  Google Scholar 

  3. Weynants, R.R., van Oost, G., Bertschinger, G., et al.: Confinement and profile changes induced by the presence of positive or negative radial electric fields in the edge of the TEXTOR Tokamak. Nucl. Fusion 32, 837 (1992)

    Article  ADS  Google Scholar 

  4. Askinazi, L.G., Golant, V., Lebedev, S.V., et al.: Radial current in a tokamak caused by a biased electrode. Nucl. Fusion 32, 271 (1992)

    Article  ADS  Google Scholar 

  5. Cabral, J.A.C., Varandas, C.A.F., Alonso, M., et al.: Enhancement of the ISTTOK plasma confinement and stability by negative limiter biasing. Plasma Phys. Control. Fusion 40, 1001 (1998)

    Article  ADS  Google Scholar 

  6. Miura, Y., et al.: Divertor biasing effects to reduce the L-H power threshold in the JFT-2M tokamak. Fusion Energy, vol. 1, p. 167, IAEA, Vienna, 1997. IAEA-CN-64/O2-4 (1996)

    Google Scholar 

  7. Schmidt, L., et al.: Divertor biasing experiments in PBX-M. IAEA Technical Committee Meeting” Tokamak plasma biasing” (1992)

    Google Scholar 

  8. Van Oost, G., Gunn, J.P., Melnikov, A., et al.: The role of radial electric fields in the Tokamaks TEXTOR-94, CASTOR and T-10. Czech J. Phys. 51, 957 (2001)

    Article  ADS  Google Scholar 

  9. Kirnev, G.S., et al.: First results of biasing experiments on the T-10 tokamak. Czech J. Phys. 51, 1011 (2001)

    Article  ADS  Google Scholar 

  10. Gorman, J.G., Rietjens, L.H.Th.: Rotating plasma experiments in the B-3 stellarator. Phys. Fluids 9, 2504 (1966)

    Article  ADS  Google Scholar 

  11. Uckan, T., Isler, R.C., Jernigan, T.C., et al.: Biased limiter experiments on the advanced toroidal facility (ATF) Torsatron. Nucl. Fusion 34, 295 (1994)

    Article  ADS  Google Scholar 

  12. Boedo, J.A., Gray, D., Jachmich, S., et al.: Enhanced particle confinement and turbulence reduction due to E × B shear in the TEXTOR tokamak. Nucl. Fusion 40, 1397 (2000)

    Article  ADS  Google Scholar 

  13. Boedo, J.A., Gray, D.S., Terry, P.W., et al.: Scaling of plasma turbulence suppression with velocity shear. Nucl. Fusion 42, 117 (2002)

    Article  ADS  Google Scholar 

  14. Dnestrovskij, Y.N., Melnikov, A.V., Krupnik, L.I., Nedzelskij, I.S.: Development of heavy ion beam probe diagnostics. IEEE Trans. Plasma Sci. 22, 310 (1994)

    Google Scholar 

  15. Melnikov, A.V., Hidalgo, C., Chmyga, A.A., et al.: Plasma potential measurements by the heavy ion beam probe diagnostic in fusion plasmas: biasing experiments in the TJ-II stellarator and T-10 tokamak. Fusion Sci. Techn. 46, 299 (2004)

    Article  Google Scholar 

  16. Ascasibar, E., Alejaldre, C., Alonso, J., et al.: Confinement and stability on the TJ-II stellarator. Plasma Phys. Control. Fusion 44, B307 (2002)

    Article  Google Scholar 

  17. Krupnik, L.I., Chmyga, A.A., Dreval, N.B., et al.: Radial electric field and confinement in stellarators. In: 30th EPS Conference Controlled Fusion and Plasma Physics. St. Petersburg, ECA, vol. 27B, P-1.24 (2003). http://epsppd.epfl.ch/StPetersburg/PDF/P1_024.PDF

  18. Herranz, J., Castejón, F., Pastor, I., McCarthy, K.J.: The spectrometer of the high-resolution multi-position Thomson scattering diagnostic for TJ-II. Fusion Eng. Des. 65, 525 (2003)

    Article  Google Scholar 

  19. Pedrosa, M.A., López-Sánchez, A., Hidalgo, C., et al.: Fast movable remotely controlled Langmuir probe system. Rev. Sci. Instrum. 70, 415 (1999)

    Article  ADS  Google Scholar 

  20. McCarthy, K.A.: First study of impurity behavior during externally induced radial electric fields in the TJ-II stellarator. Fusion Sci. Technol. 46, 129 (2004)

    Article  Google Scholar 

  21. Kirnev, G.S., Budaev, V.P., Dremin, M.M., et al.: Peculiarities of electrode biasing experiments on the T-10 tokamak in regimes with ohmic and ECR heating. Plasma Phys. Control. Fusion 45, 337 (2003)

    Article  ADS  Google Scholar 

  22. Hidalgo, C., Pedrosa, M.A., Dreval, N., et al.: Improved confinement regimes induced by limiter biasing in the TJ-II stellarator. Plasma Phys. Control. Fusion 46, 287 (2004)

    Article  ADS  Google Scholar 

  23. Pedrosa, M.A., Hidalgo, C., McCarthy, K.J., et al.: Edge turbulence during limiter biasing experiments in the TJ-II stellarator. Czech J. Phys. 53, 877 (2003)

    Article  ADS  Google Scholar 

  24. Pedrosa, M.A., et al.: Radial electric fields and improved confinement regimes in the TJ-II stellarator. In: 20th IAEA Fusion Energy Conference Vilamoura, Portugal, EX/P6-21 (2004). http://www.naweb.iaea.org/napc/physics/fec/fec2004/papers/ex_p6-21.pdf

  25. Tabares, F.L., Branas, B., Garcia-Cortes, I., et al.: Edge characteristics and global confinement of electron cyclotron resonance heated plasmas in the TJ-II stellarator. Plasma Phys. Control. Fusion 43, 1023 (2001)

    Article  ADS  Google Scholar 

  26. Garcia-Cortes, I., Lopez-Bruna, D., Tabares, F.L., et al.: Spontaneous improvement of TJ-II plasmas confinement. Plasma Phys. Control. Fusion 42, 1639 (2002)

    ADS  Google Scholar 

  27. Melnikov, A.V., Eliseev, L.G., Razumova, K.A., et al.: On the sensitivity of the plasma electric potential to the edge transport barrier for mation. J. Plasma Fusion Res. SERIES 4, 203 (2001)

    Google Scholar 

  28. Bugarya, V.I., et al.: Measurements of plasma column rotation and potential in the TM-4 tokamak. Nucl. Fusion 25, 1707 (1985)

    Google Scholar 

  29. Fujisawa, A.: Experimental study of the bifurcation nature of the electrostatic potential of a toroidal helical plasma. Plasma Phys. Control. Fusion 44, A1 (2002)

    Article  ADS  Google Scholar 

  30. Kamiya, K., Sakamoto, Y., Matsunaga, G., et al.: Spatio-temporal structure of the edge radial electric field during H-mode in JT-60U. Nucl. Fusion 51, 053009 (2011)

    Article  ADS  Google Scholar 

  31. Wagner, F., Hirsch, M., Hartfuss, H.-J., et al.: H-mode and transport barriers in helical systems. Plasma Phys. Control. Fusion 48, A217 (2006)

    Article  Google Scholar 

  32. Wagner, F.: A quarter-century of H-mode studies. Plasma Phys. Control. Fusion 49, B1 (2007)

    Article  ADS  Google Scholar 

  33. Estrada, T., Happel, T., Eliseev, L., et al.: Sheared flows and transition to improved confinement regime in the TJ-II stellarator. Plasma Phys. Control. Fusion 51, 124015 (2009)

    Article  ADS  Google Scholar 

  34. Melnikov, A., Krupnik, L., Hidalgo, C., et al.: Turbulence and plasma potential evolution study by HIBP diagnostic during L-H transition in the TJ-II stellarator. In: 36th EPS Conference on Plasma Physics, vol. 33E, P4-186. Sofia, ECA (2009). http://epsppd.epfl.ch/Sofia/pdf/P4_186.pdf

  35. Sánchez, J., Acedo, M., Alonso, A., et al.: Confinement transitions in TJ-II under Li-coated wall conditions. Nucl. Fusion 49, 104018 (2009)

    Article  ADS  Google Scholar 

  36. Bondarenko, I.S., Chmyga, A.A., Dreval, N.B., et al.: Installation of an advanced heavy ion beam diagnostic on the TJ-II stellarator. Rev. Sci. Instrum. 72, 583 (2001)

    Article  ADS  Google Scholar 

  37. Melnikov, A.V., Eliseev, L.G., Jiménez-Gómez, R., et al.: Internal measurements of Alfvén eigenmodes with heavy ion beam probing in toroidal plasmas. Nucl. Fusion 50, 084023 (2010)

    Article  ADS  Google Scholar 

  38. Hallock, G.A., Wooton, A.J.: Space potential and density fluctuations in the ISX-B tokamak. Phys. Rev. Lett. 59, 1301 (1987)

    Article  ADS  Google Scholar 

  39. Demers, D.R., Schoch, P.M., Crowley, T., et al.: Radial electrostatic flux inferred from core measurements of potential and density fluctuations. Phys. Plasmas 8, 1278 (2001)

    Article  ADS  Google Scholar 

  40. Ascasibar, E., Estrada, T., Liniers, M., et al.: Global energy confinement studies in TJ-II NBI plasmas. Contrib. Plasma Phys. 50, 594 (2010)

    Article  ADS  Google Scholar 

  41. Van Milligen, B.Ph., Estrada, T., Ascasíbar, E., et al.: Integrated data analysis at TJ-II: the density profile. Rev. Sci. Instrum. 82, 073503 (2011)

    Article  ADS  Google Scholar 

  42. Powers, E.J.: Spectral techniques for experimental investigation of plasma diffusion due polychromatic fluctuations. Nucl. Fusion 14, 749 (1974)

    Google Scholar 

  43. Burrell, K.H., et al.: Confinement physics of H-mode discharges in DIII-D. Plasma Phys. Control. Fusion 31, 1649 (1989)

    Article  ADS  Google Scholar 

  44. Lohr, J., Stallard, B.W., Prater, R., et al.: Observation of H-mode confinement in the DIII-D tokamak with electron cyclotron heating. Phys. Rev. Lett. 60, 2630 (1988)

    Article  ADS  Google Scholar 

  45. Askinazi, L.G., Belokurov, A.A., Bulanin, V.V., et al.: Physics of GAM-initiated L-H transition in a tokamak. Plasma Phys. Control. Fusion 59, 014037 (2017)

    Article  ADS  Google Scholar 

  46. Alikaev, V.V., et al.: Investigation of the H-mode during ECRH in the T-10 tokamak. Plasma Phys. Reports 26, 917 (2000)

    Article  ADS  Google Scholar 

  47. Ida, K., et al.: Edge electric-field profiles of H-mode plasmas in the JFT-2 M tokamak. Phys. Rev. Lett. 65, 1364 (1990)

    Article  ADS  Google Scholar 

  48. Gormezano, C.: High performance tokamak operation regimes. Plasma Phys. Control. Fusion 41, B367 (1999)

    Article  Google Scholar 

  49. Razumova, K.A., et al.: MHD activity and formation of the electron internal transport barrier in the T-10 tokamak. Plasma Phys. Control. Fusion 42, 973 (2000)

    Article  ADS  Google Scholar 

  50. Melnikov, A.V., et al.: Observation of the H-mode and electron ITB by heavy ion beam probe on T-10 tokamak. J. Plasma Fusion Res. SERIES 3, 46 (2000)

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. National Research Centre ‘Kurchatov Institute’, Moscow, Russia

    A. V. Melnikov

  2. National Research Nuclear University MEPhI, Moscow, Russia

    A. V. Melnikov

  3. Moscow Institute of Physics and Technology (State University), Dolgoprudny, Russia

    A. V. Melnikov

Authors
  1. A. V. Melnikov
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. V. Melnikov .

Rights and permissions

Reprints and permissions

Copyright information

© 2019 Springer Nature Switzerland AG

About this chapter

Check for updates. Verify currency and authenticity via CrossMark

Cite this chapter

Melnikov, A.V. (2019). Evolution of the Plasma Potential During Transitions to Improved Confinement Modes. In: Electric Potential in Toroidal Plasmas. Springer Series in Plasma Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-03481-8_5

Download citation

Publish with us

Policies and ethics

Search

Navigation