First results from the modular multi-channel dispersion interferometer at the TEXTOR tokamak

Abstract

Articles you may be interested in CO2 laser-based dispersion interferometer utilizing orientation-patterned gallium arsenide for plasma density measurements Rev. Sci. Instrum. 84, 093502 (2013);

Aspects of steady-state operation of the Wendelstein 7-X stellarator

“…One example development for the application on W7-X is an interferometer to measure the line integrated density. The test measurements on the TEXTOR tokamak are described in Dreier et al 2011. The operational requirements of an interferometer combine very different time scales.…”

Conceptual Design of Electron Density Measurement System for DEMO-Relevant Helical Plasmas

“…Hence, interpretation of the measured data is straightforward. Because good temporal and density resolution have already been confirmed with CO 2 lasers (wavelength 10.6 µm) [6][7][8][9], the DI is the most promising candidate. …”

“…Figure 2 shows a schematic view of the phasemodulated DI [6][7][8][9]. A mixed beam consisting of the fundamental and second harmonic components, which is generated with a nonlinear component, is used as a probe beam.…”

Diagnostics development for quasi-steady-state operation of the Wendelstein 7-X stellarator (invited)

“…Good progress had already been made with the development of this system 7 for W7-X when first impressive measurements on TEXTOR with a dispersion interferometer developed by the Budker Institute in Novosibirsk, Russia, demonstrated that this type of interferometer did not even during disruptions suffer from fringe jumps. 31 The beauty of this system is that in the measured signal any effects from retro-reflector vibrations or thermally induced changes in the laser path length cancel out entirely. This is achieved by creating an additional frequency doubled laser beam from a single, frequency stabilized crystal.…”