A view on wave excitation by W dust influx in tokamak SOL

Abstract

The contamination by W impurity originating from dust released from Plasma Facing Components (PFCs) is a crucial issue of ITER and future reactors, expected to be fitted with an all-W first wall. In all existing experiments, information on dust pollution is obtained from post-mortem analysis and the data provided are accumulated over many discharges, and generally no shot-by-shot analysis is available. Real-time detection of W dust ‘footprints’ in the form of electrostatic waves can be useful to monitor edge $T_e$ and $n_e$ pedestal evolution in high performance tokamaks.

Keywords:

• Dust inflow
• tokamak SOL
• electrostatic waves instability
• dust acoustic solitons

Disclosure statement

No potential conflict of interest was reported by the author(s).

Figure 4. Phase space $\mathrm{d}\chi /\mathrm{d}\zeta$ vs χ for$M=1.2,1.3,1.4,1.5$.

Additional information

Funding

This work was supported by ISTP CNR.

Notes on contributors

E. Lazzaro

E. Lazzaro is a theorist, former Director of ISTP CNR.

F. Causa

F. Causa is a plasma modelling researcher of ISTP CNR.

G. Gervasini

G. Gervasini is a plasma modelling senior researcher at ISTP CNR.

F. Ghezzi

F. Ghezzi is a plasma experimentalist at ISTP CNR.