Haskey, S. R.Thapar, N.Blackwell, B. D.Howard, J.2015-12-092015-12-090034-6748http://hdl.handle.net/1885/38450A new method for imaging high frequency plasma fluctuations is described. A phase locked loop and field programmable gate array are used to generate gating triggers for an intensified CCD camera. A reference signal from another diagnostic such as a magnetic probe ensures that the triggers are synchronous with the fluctuation being imaged. The synchronous imaging technique allows effective frame rates exceeding millions per second, good signal to noise through the accumulation of multiple exposures per frame, and produces high resolution images without generating excessive quantities of data. The technique can be used to image modes in the MHz range opening up the possibility of spectrally filtered high resolution imaging of MHD instabilities that produce sufficient light fluctuations. Some examples of projection images of plasma fluctuations on the H-1NF heliac obtained using this approach are presented here.This work was supported by the Education Investment Fund under the Super Science Initiative of the Australian Government. S.R.H. wishes to thank AINSE Ltd. for providing financial assistance to enable this work on H-1NF to be conducted. J.H. and B.B. acknowledge support from the Australian Research Council Discovery, Grant Nos. DP110104833 and DP0666440, respectively.6 pages© 2014 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Review of Scientific Instruments and may be found at http://doi.org/10.1063/1.4868504 http://publishing.aip.org/authors/copyright-reuse http://www.sherpa.ac.uk/romeo/issn/0034-6748imagingplasmafrequencyhighlooplockedgatearrayCCDmagneticprobe201410.1063/1.48685042016-02-24