A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements
<|begin_of_text|><|start_header_id|>system<|end_header_id|> You are a research archivist expert in dataset metadata. Answer the question truthfully.  <|eot_id|><|start_header_id|>user<|end_header_id|> Here is the Description of a dataset. Description:'A novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) to the lower range of electron temperature gradient (ETG) turbulence has been designed, installed, and operated at DIII-D. The combined diagnostic was constructed by adding a heterodyne interferometer to the pre-existing phase contrast imaging (PCI) system, both of which measure line-integrated electron-density fluctuations. The port-space footprint is minimized via use of a single 10.6-micron probe beam. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5/cm < |k_R| <= 25/cm) fluctuations with sensitivity 3e13 m^{-2} / :sqrt{kHz}, while the interferometer simultaneously measures low-k (|k_R| < 5/cm) fluctuations with sensitivity 3e14 m^{-2} / :sqrt{kHz}. The intentional mid-k overlap has been' . Please return only a json list of at most 3 Keywords corresponding to the Description:.<|eot_id|><|start_header_id|>assistant<|end_header_id|> {"Answer" : ["DIII-D","interferometry","magnetohydrodynamics","multiscale","Phase contrast","turbulence"]} <|eot_id|>
 Here is the Description of a dataset. Description:'A novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) to the lower range of electron temperature gradient (ETG) turbulence has been designed, installed, and operated at DIII-D. The combined diagnostic was constructed by adding a heterodyne interferometer to the pre-existing phase contrast imaging (PCI) system, both of which measure line-integrated electron-density fluctuations. The port-space footprint is minimized via use of a single 10.6-micron probe beam. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5/cm < |k_R| <= 25/cm) fluctuations with sensitivity 3e13 m^{-2} / :sqrt{kHz}, while the interferometer simultaneously measures low-k (|k_R| < 5/cm) fluctuations with sensitivity 3e14 m^{-2} / :sqrt{kHz}. The intentional mid-k overlap has been' . Please return only a json list of at most 3 Keywords corresponding to the Description:.
A novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) to the lower range of electron temperature gradient (ETG) turbulence has been designed, installed, and operated at DIII-D. The combined diagnostic was constructed by adding a heterodyne interferometer to the pre-existing phase contrast imaging (PCI) system, both of which measure line-integrated electron-density fluctuations. The port-space footprint is minimized via use of a single 10.6-micron probe beam. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5/cm < |k_R| <= 25/cm) fluctuations with sensitivity 3e13 m^{-2} / :sqrt{kHz}, while the interferometer simultaneously measures low-k (|k_R| < 5/cm) fluctuations with sensitivity 3e14 m^{-2} / :sqrt{kHz}. The intentional mid-k overlap has been
DIII-D; interferometry; magnetohydrodynamics; multiscale; Phase contrast; turbulence