Chapter 8: The Diagnostic Systems in the FTU

Peaked density profiles and MHD activity on FTU in lithium dominated discharges

“…However, this port is split in two by a mechanical reinforcement of the vacuum vessel, each of which is scanned by a beam of the CO 2 /CO interferometer. The two color interferometers use a CO 2 laser (10.6 m) as main wavelength and a CO laser (5.4 m) for compensation of the mechanical vibrations [9,10]. Each of the two scanning beams are produced by a fast tilting mirror that oscillates in the focus of a parabolic mirror, so two vertically translating beams are obtained.…”

Runaway electron imaging spectrometry (REIS) system

“…Such issues can be studied in detail in dedicated programs in smaller experiments that permit the realization of relevant scenarios involving significant fractions of REs. [2][3][4] In this context, the recent integration of different diagnostics 5 and new software tools within the FTU real-time RE control system 6,7 is contributing to the characterization of RE dynamics 8 to the study of effective mitigation strategies 9 and to the design of control-oriented dynamical models of current, horizontal, and vertical displacement for REs in the postdisruption phase. 10 A specific activity was focused on the design, development, and construction of a new plasma diagnostic, referred to as REIS (RE Imaging and Spectroscopy system) to detect and study in-flight REs.…”

Advances In The Development Of A Cherenkov Diagnostic System To Study Runaway Electron Losses

“…Significant research efforts are necessary to study and understand how to control Runaway Electrons (REs) and to implement adequate control schemes to prevent disruptions. Fast electrons within the plasma are typically monitored and detected using infrared, [1], gamma-ray cameras and hard X-ray diagnostics, [2], [3]. However, recently an optical diagnostics based on the Cherenkov effect, [4], was demonstrated to be effective in monitoring fast electron losses in FTU, particularly in scenarios involving plasma instabilities that can lead to disruption, [5].…”