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von Luhmann, Alexander,Muller, Klaus-Robert IEEE 2017 IEEE Transactions on Biomedical Engineering Vol.64 No.6
<P>Objective: For the further development of the fields of telemedicine, neurotechnology, and brain-computer interfaces, advances in hybrid multimodal signal acquisition and processing technology are invaluable. Currently, there are no commonly available hybrid devices combining bioelectrical and biooptical neurophysiological measurements [here electroencephalography (EEG) and functional near-infrared spectroscopy (NIRS)]. Our objective was to design such an instrument in a miniaturized, customizable, and wireless form. Methods: We present here the design and evaluation of a mobile, modular, multimodal biosignal acquisition architecture (M3BA) based on a high-performance analog front-end optimized for biopotential acquisition, a microcontroller, and our openNIRS technology. Results: The designed M3BA modules are very small configurable high-precision and low-noise modules (EEG input referred noise @ 500 SPS 1.39 μV<SUB>pp</SUB>, NIRS noise equivalent power NEP<SUB>750 nm</SUB> = 5.92 pW<SUB>pp</SUB>, and NEP<SUB>850 nm</SUB> = 4.77 pW<SUB>pp</SUB>) with full input linearity, Bluetooth, 3-D accelerometer, and low power consumption. They support flexible user-specified biopotential reference setups and wireless body area/sensor network scenarios. Conclusion: Performance characterization and in-vivo experiments confirmed functionality and quality of the designed architecture. Significance: Telemedicine and assistive neurotechnology scenarios will increasingly include wearable multimodal sensors in the future. The M3BA architecture can significantly facilitate future designs for research in these and other fields that rely on customized mobile hybrid biosignal modal biosignal acquisition architecture (M3BA), multimodal, near-infrared spectroscopy (NIRS), wireless body area network (WBAN), wireless body sensor network (WBSN).</P>
Liu, Ying,Davies, Jackie A.,Luhmann, Janet G.,Vourlidas, Angelos,Bale, Stuart D.,Lin, Robert P. IOP Publishing 2010 ASTROPHYSICAL JOURNAL LETTERS - Vol.710 No.1
<P>We describe a geometric triangulation technique, based on time-elongation maps constructed from imaging observations, to track coronal mass ejections (CMEs) continuously in the heliosphere and predict their impact on the Earth. Taking advantage of stereoscopic imaging observations from the Solar Terrestrial Relations Observatory, this technique can determine the propagation direction and radial distance of CMEs from their birth in the Corona all the way to 1 AU. The efficacy of the method is demonstrated by its application to the 2008 December 12 CME, which manifests as a magnetic cloud (MC) from in situ measurements at the Earth. The predicted arrival time and radial velocity at the Earth are well confirmed by the in situ observations around the MC. Our method reveals non-radial motions and velocity changes of the CME over large distances in the heliosphere. It also associates the flux-rope structure measured in situ with the dark cavity of the CME in imaging observations. Implementation of the technique, which is expected to be a routine possibility in the future, may indicate a substantial advance in CME studies as well as space weather forecasting.</P>
Electron cyclotron emission imaging in tokamak plasmas.
Munsat, Tobin,Domier, Calvin W,Kong, Xiangyu,Liang, Tianran,Luhmann, Neville C,Tobias, Benjamin J,Lee, Woochang,Park, Hyeon K,Yun, Gunsu,Classen, Ivo G J,Donné,, Anthony J H Optical Society of America 2010 Applied Optics Vol.49 No.19
<P>We discuss the recent history and latest developments of the electron cyclotron emission imaging diagnostic technique, wherein electron temperature is measured in magnetically confined plasmas with two-dimensional spatial resolution. The key enabling technologies for this technique are the large-aperture optical systems and the linear detector arrays sensitive to millimeter-wavelength radiation. We present the status and recent progress on existing instruments as well as new systems under development for future experiments. We also discuss data analysis techniques relevant to plasma imaging diagnostics and present recent temperature fluctuation results from the tokamak experiment for technology oriented research (TEXTOR).</P>
Choi, M.J.,Park, H.K.,Yun, G.S.,Lee, W.,Luhmann Jr., N.C.,Lee, K.D.,Ko, W.-H.,Park, Y.-S.,Park, B.H.,In, Y. IOP 2016 Nuclear fusion Vol.56 No.6
<P>Minor and major disruptions by explosive MHD instabilities were observed with the novel quasi 3D electron cyclotron emission imaging (ECEI) system in the KSTAR plasma. The fine electron temperature (<I>T</I> <SUB>e</SUB>) fluctuation images revealed two types of minor disruptions: a small minor disruption is a <img ALIGN='MIDDLE' ALT='$q\sim 2$ ' SRC='http://ej.iop.org/images/0029-5515/56/6/066013/nfaa223aieqn001.gif'/> localized fast transport event due to a single <I>m</I>/<I>n</I> = 2/1 magnetic island growth, while a large minor disruption is partial collapse of the <img ALIGN='MIDDLE' ALT='$q\leqslant 2$ ' SRC='http://ej.iop.org/images/0029-5515/56/6/066013/nfaa223aieqn002.gif'/> region with two successive fast heat transport events by the correlated <I>m</I>/<I>n</I> = 2/1 and <I>m</I>/<I>n</I> = 1/1 instabilities. The <I>m</I>/<I>n</I> = 2/1 magnetic island growth during the minor disruption is normally limited below the saturation width. However, as the additional interchange-like perturbation grows near the inner separatrix of the 2/1 island, the 2/1 island can expand beyond the limit through coupling with the cold bubble formed by the interchange-like perturbation.</P>
K. C. Lee,C. W. Domier,N. C. Luhmann,R. Kaita,S. S. Medley,S. P. Gerhardt,NSTX research team,H. K. Park,S. A. Sabbagh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.11
The radial current generated by ion-neutral momentum exchange is suggested to be one ofthe methods for generating the radial electric field (Er), the turbulence transport, and the lowconfinement-mode (L-mode) to high-confinement-mode (H-mode) transitions at the edge of tokamakplasmas. In this analysis of the gyrocenter shift, the plasma pressure gradient, the neutraldensity gradient and the neutral velocity are the major driving mechanisms of the radial current andthe electric field. When there is turbulence, small-scale ˜E × B eddies induce cross-field transport. The confinement time of the National Spherical Torus Experiment is compared with the densityfluctuation level to verify the turbulence-induced energy diffusion coefficient from the theory of thegyrocenter shift.
Classen, I G J,Lauber, Ph,Curran, D,Boom, J E,Tobias, B J,Domier, C W,Luhmann Jr, N C,Park, H K,Garcia Munoz, M,Geiger, B,Maraschek, M,Van Zeeland, M A,da Graç,a, S Published jointly by The Institute of Physics and 2011 Plasma physics and controlled fusion Vol.53 No.12
<P>Detailed measurements of the 2D mode structure of Alfvén instabilities in the current ramp-up phase of neutral beam heated discharges were performed on ASDEX Upgrade, using the electron cyclotron emission imaging (ECEI) diagnostic. This paper focuses on the observation of reversed shear Alfvén eigenmodes (RSAEs) and bursting modes that, with the use of the information from ECEI, have been identified as beta-induced Alfvén eigenmodes (BAEs). Both RSAEs with first and second radial harmonic mode structures were observed. Calculations with the linear gyro-kinetic code LIGKA revealed that the ratio of the damping rates and the frequency difference between the first and second harmonic modes strongly depended on the shape of the <I>q</I>-profile. The bursting character of the BAE type modes, which were radially localized to rational <I>q</I> surfaces, was observed to sensitively depend on the plasma parameters, ranging from strongly bursting to almost steady state.</P>