Fusion - Stellarator Research

The focus of the topic is the exploitation of Wendelstein 7-X and the assessment of its prospects for a fusion power plant. After highly successful initial operation campaigns the completion of the device with actively cooled in-vessel components and plasma target design for heat load up to 10 MW/m2 has just started. This upgrade is the central element in preparing the device for high performance steady-state plasma operation. The final goal is to show that the optimized magnetic field configuration is characterized by the required confinement and stability properties for a power plant.

  1. H. S. Bosch, R. C. Wolf, T. Andreeva, J. Baldzuhn, D. Birus, et al., Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X, Nucl. Fusion 53, 126001 (2013) doi:10.1088/0029-5515/53/12/126001
  2. H. S. Bosch, R. Brakel, T. Braeuer, V. Bykov, P. van Eeten, et al., Final integration, commissioning and start of the Wendelstein 7-X stellarator operation, Nucl. Fusion 57, 116015 (2017) doi:10.1088/1741-4326/aa7cbb
  3. A. Dinklage, C. D. Beidler, P. Helander, G. Fuchert, H. Maaßberg, et al., Magnetic configuration effects on the Wendelstein 7-X stellarator,  Nat. Phys. 14, 855 (2018) doi:10.1038/s41567-018-0141-9
  4. F. Effenberg, Y. Feng, O. Schmitz, H. Frerichs, S. A. Bozhenkov, et al., Numerical investigation of plasma edge transport and limiter heat fluxes in Wendelstein 7-X startup plasmas with EMC3-EIRENE, Nucl. Fusion 57, 036021 (2017) doi:10.1088/1741-4326/aa4f83
  5. T. Klinger, A. Alonso, S. Bozhenkov, R. Burhenn, A. Dinklage, et al., Performance and properties of the first plasmas of Wendelstein 7-X, Plasma Phys. Contr. F. 59, 014018 (2017) doi:10.1088/0741-3335/59/1/014018
  6. T. Klinger, T. Andreeva, S. Bozhenkov, C. Brandt, R. Burhenn, et al., Overview of first Wendelstein 7-X high performance operation, Nucl. Fusion 59, 112004 (2019) doi:10.1088.1741-4326/ab03a7
  7. M. Krychowiak, A. Adnan, A. Alonso, T. Andreeva, J. Baldzuhn, et al., Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X, Rev. Sci. Instrum. 87, 11D304 (2016) doi:10.1063/1.4964376
  8. N. A. Pablant, A.Langenberg, A. Alonso, C. D. Beidler, M. Bitter, et al., Core radial electric field and transport in Wendelstein 7-X plasmas, Phys. Plasmas 25, 022508 (2018) doi:10.1063/1.4999842
  9. T. Sunn Pedersen, T. Andreeva, H. S. Bosch, S. Bozhenkov, F. Effenberg, et al., Plans for the first plasma operation of Wendelstein 7-X, Nucl. Fusion 55, 126001 (2015) doi:10.1088/0029-5515/55/12/126001
  10. T. Sunn Pedersen, M. Otte, S. Lazerson, P. Helander, S. Bozhenkov, et al.,Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000, Nat. Commun.7, 13493 (2016) doi:10.1038/ncomms13493
  11. T. Sunn Pedersen, A. Dinklage, Y. Turkin, R. Wolf, S. Bozhenkov, et al.,Key results from the first plasma operation phase and outlook for future performance in Wendelstein 7-X, Phys. Plasmas 24, 055503 (2017) doi:10.1063/1.4983629
  12. F. Warmer, C. D. Beidler, A .Dinklage, R. Wolf, W7-X Team, From W7-X to a HELIAS fusion power plant: motivation and options for an intermediate-step burning-plasma stellarator, Plasma Phys. Contr. F. 58, 074006 (2016) doi:10.1088/0741-3335/58/7/074006
  13. T. Windisch, A. Krämer-Flecken, J. L. Velasco, A. Könies, C. Nührenberg, et al., Poloidal correlation reflectometry at W7-X: radial electric field and fluctuations, Plasma Phys. Contr. F.59, 105002 (2017) doi:10.1088/1361-6587/aa759b
  14. R. C. Wolf, A. Ali, A. Alonso, J. Baldzuhn, C. Beidler, et al., Major results from the first plasma campaign of the Wendelstein 7-X stellarator, Nucl. Fusion 57, 102020 (2017) doi:10.1088/1741-4326/aa770d
  15. D. Zhang, R. König, Y. Feng, R. Burhenn, S. Brezinsek, et al., First Observation of a Stable Highly Dissipative Divertor Plasma Regime on the Wendelstein 7-X Stellarator, Phys. Rev. Lett. 123, 025002 (2019) doi:10.1103/PhysRevLett.123.025002