Preliminary analysis of alternative divertors for DEMO

Abstract A physics and engineering analysis of alternative divertor configurations is carried out by examining benefits and problems by comparing the baseline single null solution with a Snowflake, an X- and a Super-X divertor. It is observed that alternative configurations can provide margin and resilience against large power fluctuations, but their engineering has intrinsic difficulties, especially in the balance between structural solidity and accessibility of the components and when the specific poloidal field coil positioning poses further constraints. A hybrid between the X- and Super-X divertor is proposed as a possible solution to the integration challenge.

[1]  P. Ricci,et al.  Turbulence and flows in the plasma boundary of snowflake magnetic configurations , 2020, Nuclear Fusion.

[2]  P. Valanju,et al.  On heat loading, novel divertors, and fusion reactors , 2006 .

[3]  B. Lipschultz,et al.  Sensitivity of detachment extent to magnetic configuration and external parameters , 2016 .

[4]  Miss A.O. Penney.  (b) , 1974, The New Yale Book of Quotations.

[5]  Shuichi Takamura,et al.  Chapter 4: Power and particle control , 2007 .

[6]  S. Voskoboynikov,et al.  SOLPS-ITER modelling of ITER edge plasma with drifts and currents , 2020, Nuclear Fusion.

[7]  D. Ryutov,et al.  The ‘churning mode’ of plasma convection in the tokamak divertor region , 2014 .

[8]  D. Coster,et al.  SOLPS simulations of detachment in a snowflake configuration for the future upper divertor in ASDEX Upgrade , 2018, Plasma Physics and Controlled Fusion.

[9]  P. Valanju,et al.  Super-X divertors and high power density fusion devices , 2009 .

[10]  Gerald Pintsuk,et al.  Overview of the DEMO staged design approach in Europe , 2019, Nuclear Fusion.

[11]  N. Fedorczak,et al.  Drive of parallel flows by turbulence and large-scale E × B transverse transport in divertor geometry , 2017 .

[12]  D. Ryutov.  Geometrical properties of a “snowflake” divertor , 2007 .

[13]  D. Ryutov,et al.  The snowflake divertor , 2015 .

[14]  李幼升,et al.  Ph , 1989 .

[15]  T. Lunt,et al.  Assessment of alternative divertor configurations as an exhaust solution for DEMO , 2020, Nuclear Fusion.