Thomson scattering diagnostics at the Globus M2 tokamak

The paper is devoted to the Thomson scattering (TS) diagnostics recently developed for the Globus-M2 spherical tokamak and prototyping the ITER divertor TS diagnostics. The distinctive features of the system are the use of spectrometers, acquisition system and lasers that meet the base requirements for ITER TS diagnostics. The paper describes the diagnostic system that allows precise measurements of TS signals, as well as the results of the first measurements of electron temperature and density in both central region of the plasma column and scrape-off layer. The system provides measurements of electron temperature $T_{e}$ in the range of 5 eV to 5 keV and density $n_{e}$ in the range of $5{\cdot}10^{17}{\div}3.25{\cdot}10^{20} m^{-3}$. The use of two ITER-grade probing lasers of different wavelengths (Nd:YAG 1064.5 nm and Nd:YLF 1047.3 nm) allows reliable measurement of $T_{e}$ in multi-colour mode, i.e., assuming that spectral calibration is unknown

Charge transfer and 2k F

A first-principles DFT study of the electronic structure of the two-chain molecular conductor NMP-TCNQ is reported. It is shown that the charge transfer occurring in this salt is not 1 but 2/3, finally settling the debate concerning the real charge transfer in this molecular metal. These calculations also lead to a simple rationalization of the three different regimes of 2kF and 4kF CDW instabilities occurring in the solid solutions (NMP)x(Phen)1−xTCNQ.One of us (JPP) thanks A. J. Epstein for collaborations in the study of the (NMP)x(Phen)1xTCNQ system. This work was supported by MINECO (Spain) through Grants FIS2012-37549-C05-05 and CTQ2011-23862-C02- 02, as well as Generalitat de Catalunya (2014SGR301 and XRQTC). E.C. acknowledges support of the Span- ish MINECO through the Severo Ochoa Centers of Ex- cellence Program under Grant SEV-2015-0496.Peer reviewe