K. Crombé, IShTAR: a helicon plasma source to characterize the interactions between ICRF and plasma, 26th IAEA Fusion Energy Conference, EX P6-48, 2016.

L. Lu, Plasma Phys. Control. Fusion, vol.60, issue.3, p.35003, 2018.

K. Crombé and D. Van-eester, J. Plasma Phys, vol.82, p.905820203, 2016.

A. Kostic, Feasibility study of Passive Optical Emission Spectroscopy for the electric field measurements in IShTAR, EPJ Web of Conferences, vol.157, p.3025, 2017.

A. Kostic, Development of a spectroscopic diagnostic tool for electric field measurements in IShTAR, Rev. Scientific Instruments

E. H. Martin, Electric field measurements of the capacitively coupled magnetized RF sheath utilizing passive optical emission spectroscopy, 2014.

E. H. Martin and A. Zafar, Review of Scientific Instruments, vol.87, pp.11-402, 2016.

C. Wieman and T. Hansch, Phys. Rev. Lett, vol.17, p.1170, 1976.

K. Crombé, Helium operation of IShTAR in preparation of E-field measurements, 44th EPS Conference on Plasma Physics, vol.41, pp.5-144, 2017.

T. Verstrynge, Spectroscopic diagnostics of IShTAR plasma, 2018.

, This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission