Systems Studies of Double Null Divertor Models

Systems Studies of Double Null Divertor Models

Systems Studies of Double Null Divertor Models 150 150 UKAEA Opendata
UKAEA-CCFE-CP(19)37

Systems Studies of Double Null Divertor Models

As conceptual design options for a demonstration fusion power plant (DEMO) are explored it is important to understand the design space for possible non-ITER like design options. The power exhaust is a key design driver for a fusion power plant, and puts strong constraints on the size of the machine. One candidate for a alternative design is a double null divertor configuration which provides better power and heat flux management,[1,2,3] but involves decreased space in the first wall for blanket technologies and more demanding vertical plasma stabilisation procedures.[4] A tool for understanding large integrated technology problems is a systems code, such as PROCESS. The systems code models all important plant systems and allows for the fast evaluation of consistent scenarios which can therefore also be used to explore alternative designs for baseline design options, with the need for later extensive detailed studies. In this work we will use the PROCESS system code to analyse the effect of double null divertors, and seek to find the both the advantages and disadvantages for employing a double null configuration divertor technology. We will discuss changes to the power handling, plasma physics and blanket systems within the power plant and their consequences for operation. In addition, to gain the greatest benefit from double null divertor configurations, it’s desirable to operate in a regime in which the power across the separatrix is shared evenly into both the upper and lower divertors, known as connected double null. Therefore for understanding the impact on power plant designs it is important to understand the constraints a plasma’s vertical instability growth rate puts on the wider areas of the plant design. In particular, we will discuss the degree of vertical stabilisation necessary for operation in a connected double null configuration in a given DEMO like plant design.

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46th European Physical Society Conference on Plasma Physics (EPS), Milan, 8-12 July 2019