Abstract
Electron cyclotron (EC) wave power losses tend to play a significant role in the local electron power balance of a tokamak fusion reactor for electron temperatures above 35 keV as considered for steady-state operation. Using the RAYTEC code a comparative study of EC wave and bremsstrahlung contributions to the local and total power balance in relation to the α -particle heating power was carried out for a range of plasma conditions, wall reflection coefficients of the EC waves, and magnetic fields.
Highlights
In view of the potential benefits of operating DEMO at high plasma temperature [1], electron cyclotron (EC) radiative transport and losses are of particular relevance since in this case the locally radiated net EC power density in the plasma core tends to become significant ZLWK UHVSHFW WR WKH SRZHU GHQVLW\ RI IXVLRQ Į-particle KHDWLQJ >@ 7R FRYHU Į-particle heating the RAYTEC code [4] was complemented with Brunelli’s fit [5] for the DT fusion cross-section, VQ! = 9×10-22 exp[-0.476 |ln(T/69)|2.25] (m3s-1), (1)which provides an excellent approximation up to electron temperatures of 150 keV.Here, a detailed analysis of the net EC radiation losses in high-temperature DEMO-like plasmas is presented
The reference value taken for the wall reflection coefficient is Rw = 0.8; this comparatively high value implies that the corresponding EC wave power losses result to be rather on the low side
It is seen that bremsstrahlung losses are comparatively unimportant, the more the higher the electron temperature is
Summary
In view of the potential benefits of operating DEMO at high plasma temperature [1], electron cyclotron (EC) radiative transport and losses are of particular relevance since in this case the locally radiated net EC power density in the plasma core tends to become significant ZLWK UHVSHFW WR WKH SRZHU GHQVLW\ RI IXVLRQ Į-particle KHDWLQJ >@ 7R FRYHU Į-particle heating the RAYTEC code [4] was complemented with Brunelli’s fit [5] for the DT fusion cross-section, VQ! A detailed analysis of the net EC radiation losses in high-temperature DEMO-like plasmas is presented. The results are put in relation to the corresponding EUHPVVWUDKOXQJ ORVVHV DQG WR Į-particle heating (assuming no dilution effect)
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