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Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited)

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Organization
Abstract
Wendelstein 7-X, a superconducting optimized stellarator built in Greifswald/Germany, started its first plasmas with the last closed flux surface (LCFS) defined by 5 uncooled graphite limiters in December 2015. At the end of the 10 weeks long experimental campaign (OP1.1) more than 20 independent diagnostic systems were in operation, allowing detailed studies of many interesting plasma phenomena. For example, fast neutral gas manometers supported by video cameras (including one fast-frame camera with frame rates of tens of kHz) as well as visible cameras with different interference filters, with field of views covering all ten half-modules of the stellarator, discovered a MARFE-like radiation zone on the inboard side of machine module 4. This structure is presumably triggered by an inadvertent plasma-wall interaction in module 4 resulting in a high impurity influx that terminates some discharges by radiation cooling. The main plasma parameters achieved in OP1.1 exceeded predicted values in discharges of a length reaching 6 s. Although OP1.1 is characterized by short pulses, many of the diagnostics are already designed for quasi-steady state operation of 30 min discharges heated at 10 MW of ECRH. An overview of diagnostic performance for OP1.1 is given, including some highlights from the physics campaigns.
Keywords
SPECTROMETER, STELLARATOR, FRAMEWORK, DESIGN

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MLA
Krychowiak, M. et al. “Overview of Diagnostic Performance and Results for the First Operation Phase in Wendelstein 7-X (invited).” REVIEW OF SCIENTIFIC INSTRUMENTS 87.11 (2016): n. pag. Print.
APA
Krychowiak, M., Adnan, A., Alonso, A., Andreeva, T., Baldzuhn, J., Barbui, T., Beurskens, M., et al. (2016). Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited). REVIEW OF SCIENTIFIC INSTRUMENTS, 87(11). Presented at the 21st Topical Conference on High-Temperature Plasma Diagnostics.
Chicago author-date
Krychowiak, M., A. Adnan, A. Alonso, T. Andreeva, J. Baldzuhn, T. Barbui, M. Beurskens, et al. 2016. “Overview of Diagnostic Performance and Results for the First Operation Phase in Wendelstein 7-X (invited).” Review of Scientific Instruments 87 (11).
Chicago author-date (all authors)
Krychowiak, M., A. Adnan, A. Alonso, T. Andreeva, J. Baldzuhn, T. Barbui, M. Beurskens, Wolfgang Biel, C. Biedermann, B. D. Blackwell, H. S. Bosch, S. Bozhenkov, R. Brakel, T. Braeuer, B. Brotas de Carvalho, R. Burhenn, B. Buttenschoen, A. Cappa, G. Cseh, A. Czarnecka, A. Dinklage, P. Drews, A. Dzikowicka, F. Effenberg, M. Endler, V. Erckmann, T. Estrada, O. Ford, T. Fornal, H. Frerichs, G. Fuchert, J. Geiger, O. Grulke, J. H. Harris, H. J. Hartfuss, D. Hartmann, D. Hathiramani, M. Hirsch, U. Hoefel, S. Jablonski, M. W. Jakubowski, J. Kaczmarczyk, T. Klinger, S. Klose, J. Knauer, G. Kocsis, R. Koenig, P. Kornejew, A. Kraemer-Flecken, N. Krawczyk, T. Kremeyer, I. Ksiazek, M. Kubkowska, A. Langenberg, H. P. Laqua, M. Laux, S. Lazerson, Y. Liang, S. C. Liu, A. Lorenz, A. O. Marchuk, S. Marsen, V. Moncada, D. Naujoks, H. Neilson, O. Neubauer, U. Neuner, H. Niemann, J. W. Oosterbeek, M. Otte, N. Pablant, E. Pasch, T. Sunn Pedersen, F. Pisano, K. Rahbarnia, L. Ryc, O. Schmitz, S. Schmuck, W. Schneider, T. Schroeder, H. Schuhmacher, B. Schweer, B. Standley, T. Stange, L. Stephey, J. Svensson, T. Szabolics, T. Szepesi, H. Thomsen, J. -M. Travere, H. Trimino Mora, H. Tsuchiya, G. M. Weir, U. Wenzel, A. Werner, B. Wiegel, T. Windisch, R. Wolf, G. A. Wurden, D. Zhang, A. Zimbal, and S. Zoletnik. 2016. “Overview of Diagnostic Performance and Results for the First Operation Phase in Wendelstein 7-X (invited).” Review of Scientific Instruments 87 (11).
Vancouver
1.
Krychowiak M, Adnan A, Alonso A, Andreeva T, Baldzuhn J, Barbui T, et al. Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited). REVIEW OF SCIENTIFIC INSTRUMENTS. Melville: Amer Inst Physics; 2016;87(11).
IEEE
[1]
M. Krychowiak et al., “Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited),” REVIEW OF SCIENTIFIC INSTRUMENTS, vol. 87, no. 11, 2016.
@article{8517502,
  abstract     = {Wendelstein 7-X, a superconducting optimized stellarator built in Greifswald/Germany, started its first plasmas with the last closed flux surface (LCFS) defined by 5 uncooled graphite limiters in December 2015. At the end of the 10 weeks long experimental campaign (OP1.1) more than 20 independent diagnostic systems were in operation, allowing detailed studies of many interesting plasma phenomena. For example, fast neutral gas manometers supported by video cameras (including one fast-frame camera with frame rates of tens of kHz) as well as visible cameras with different interference filters, with field of views covering all ten half-modules of the stellarator, discovered a MARFE-like radiation zone on the inboard side of machine module 4. This structure is presumably triggered by an inadvertent plasma-wall interaction in module 4 resulting in a high impurity influx that terminates some discharges by radiation cooling. The main plasma parameters achieved in OP1.1 exceeded predicted values in discharges of a length reaching 6 s. Although OP1.1 is characterized by short pulses, many of the diagnostics are already designed for quasi-steady state operation of 30 min discharges heated at 10 MW of ECRH. An overview of diagnostic performance for OP1.1 is given, including some highlights from the physics campaigns.},
  articleno    = {11D304},
  author       = {Krychowiak, M. and Adnan, A. and Alonso, A. and Andreeva, T. and Baldzuhn, J. and Barbui, T. and Beurskens, M. and Biel, Wolfgang and Biedermann, C. and Blackwell, B. D. and Bosch, H. S. and Bozhenkov, S. and Brakel, R. and Braeuer, T. and de Carvalho, B. Brotas and Burhenn, R. and Buttenschoen, B. and Cappa, A. and Cseh, G. and Czarnecka, A. and Dinklage, A. and Drews, P. and Dzikowicka, A. and Effenberg, F. and Endler, M. and Erckmann, V. and Estrada, T. and Ford, O. and Fornal, T. and Frerichs, H. and Fuchert, G. and Geiger, J. and Grulke, O. and Harris, J. H. and Hartfuss, H. J. and Hartmann, D. and Hathiramani, D. and Hirsch, M. and Hoefel, U. and Jablonski, S. and Jakubowski, M. W. and Kaczmarczyk, J. and Klinger, T. and Klose, S. and Knauer, J. and Kocsis, G. and Koenig, R. and Kornejew, P. and Kraemer-Flecken, A. and Krawczyk, N. and Kremeyer, T. and Ksiazek, I. and Kubkowska, M. and Langenberg, A. and Laqua, H. P. and Laux, M. and Lazerson, S. and Liang, Y. and Liu, S. C. and Lorenz, A. and Marchuk, A. O. and Marsen, S. and Moncada, V. and Naujoks, D. and Neilson, H. and Neubauer, O. and Neuner, U. and Niemann, H. and Oosterbeek, J. W. and Otte, M. and Pablant, N. and Pasch, E. and Pedersen, T. Sunn and Pisano, F. and Rahbarnia, K. and Ryc, L. and Schmitz, O. and Schmuck, S. and Schneider, W. and Schroeder, T. and Schuhmacher, H. and Schweer, B. and Standley, B. and Stange, T. and Stephey, L. and Svensson, J. and Szabolics, T. and Szepesi, T. and Thomsen, H. and Travere, J. -M. and Mora, H. Trimino and Tsuchiya, H. and Weir, G. M. and Wenzel, U. and Werner, A. and Wiegel, B. and Windisch, T. and Wolf, R. and Wurden, G. A. and Zhang, D. and Zimbal, A. and Zoletnik, S.},
  issn         = {0034-6748},
  journal      = {REVIEW OF SCIENTIFIC INSTRUMENTS},
  keywords     = {SPECTROMETER,STELLARATOR,FRAMEWORK,DESIGN},
  language     = {eng},
  location     = {Madison, WI},
  number       = {11},
  pages        = {7},
  publisher    = {Amer Inst Physics},
  title        = {Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited)},
  url          = {http://dx.doi.org/10.1063/1.4964376},
  volume       = {87},
  year         = {2016},
}

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