NDLI: Investigation of Impurity Transport in Alcator C-Mod Using Laser Blow-Off Impurity Injection

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Investigation of Impurity Transport in Alcator C-Mod Using Laser Blow-Off Impurity Injection

Content Provider	Semantic Scholar
Author	Chilenski Greenwald, Martin Howard, N. T. Delgado-Aparicio, L. F. Faust, Ian Reinke, Matthew L. White, Alice E.
Copyright Year	2012
Abstract	Alcator C-Mod is equipped with a multi-pulse laser blow-o impurity injector, capable of injecting a small amount of a given impurity into the plasma as frequently as once every 0.1 s. This system is used as an actuator for studies of impurity transport, where calcium is oen used as it is non-intrinsic and non-recycling. To observe the eect of the injection, a high-resolution x-ray imaging crystal spectrometer captures temporally-resolved proles of the emission from heliumlike calcium. These emission proles can then be analyzed to obtain temporally-resolved proles of the impurity diusivity and convective pinch velocity. Injections have been performed in a variety of plasmas including L-modes, H-modes, I-modes and plasmaswith high fractions of lower hybrid current drive. C-Mod’s combination of an impurity injector with a high-resolution x-ray spectrometer provides a powerful system for probing the behavior of impurity transport in these various regimes. Multi-pulse laser blow-o impurity injector: controlled introduction of impurities Controlled impurity injections are a very powerful tool to probe transport • Small (nonperturbative) injection of a non-intrinsic, nonrecycling impurity (such as calcium) enables systematic study of impurity transport [1, 2]. • Larger injections are used to induce cold pulses to investigate non-local thermal transport [3] (see C. Gao et al., JP8.00080). Hardware overview • Motorized steering for between-shot positioning. • Piezoelectric steering for in-shot movement of beam. • Fast steering and 10Hz laser repetition rate enables multiple injections into a shot. Impurity transport coe cient pro les have been successfully measured for L-mode plasmas 0.0 0.1 0.2 0.3 0.4 0.5 0.6 r/a 0 1 2 3 4 5 6 7
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www1.psfc.mit.edu/research/alcator/pubs/APS/APS2012/Chilenski_APS2012_poster.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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