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QCM based sensor for detecting volumetric properties of liquids
Nikolay Mukhin,Ralf Lucklum 한국물리학회 2019 Current Applied Physics Vol.19 No.6
We introduce a microacoustic sensor, which combines the quartz crystal microbalance, a liquid-filled cavity and an intermediate artificial layer with effective acoustic properties. Each of the three components fulfils a specific task. The quartz vibrates in its thickness shear mode and acts as source and detector of shear waves, which penetrate the intermediate artificial layer and excite a resonance in the liquid-filled cavity. Both the piezoelectric transducer and the liquid-filled cavity are high-Q resonators with well-adjusted resonance frequencies very close to each other. The intermediate artificial layer couples the two resonators in a distinct manner via control of the propagation of acoustic waves between the quartz crystal and the liquid-filled cavity layer. The origin of the sensor signal is a change of the resonance frequency of the liquid-filled cavity caused by variations of acoustic properties of the liquid analyte inside the cavity, first of all speed of sound. This resonance appears as second resonance peak in the admittance spectrum of the quartz crystal.
Laser amplification in Yb:YAG thin rods of different geometries: simulation and experiment
Lee, B.,Chizhov, S. A.,Sall, E. G.,Kim, J. W.,Kuznetsov, I. I.,Mukhin, I. B.,Palashov, O. V.,Kim, G. H.,Yashin, V. E.,Vadimova, O. L. The Optical Society 2018 Journal of the Optical Society of America. B, Opti Vol.35 No.10
Reflector Impulse Antenna of High Electrodynamic Potential
Berdin, Sergey A.,Gadetski, Nickolay P.,Kravtsova, Elena I.,Jaimin Lee,Magda, Igor I.,Mukhin, Valentin S.,Ryu, Jiheon H.,Sinitsin, Victor G.,Vyazmitinov, Igor A. IEEE 2013 IEEE transactions on plasma science Vol.41 No.9
<P>A few versions of impulse antennas are studied with the aim of suggesting an optimal design of the feed line and radiator for the reflector-based antenna and ensuring operation of the facility at high voltages and under field conditions. The high-voltage system described as the final choice is intended for shaping and radiating electromagnetic pulses of ultrashort duration, while maintaining the proper electric strength of its components. It is characterized by an electrodynamic potential (field-range product) W = 1.2 MV. The system is a variant of the half-reflector impulse antenna design, involving a half-circular parabolic reflector that is excited through a nonuniform dual-line feeder of simple geometry.</P>
Vorpahl, Christian,Alekseev, Andrey,Arshad, Shakeib,Hatae, Takaki,Khodak, Andrei,Klabacha, Jonathan,Le Guern, Frederic,Mukhin, Eugene,Pak, Sunil,Seon, Changrae,Smith, Mark,Yatsuka, Eiichi,Zvonkov, Ale North-Holland 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>Numerous plasma-near mirrors of optical diagnostics in ITER require protection from erosion and deposition caused by impinging particles. This is achieved by 63 Diagnostic Shutters, which shall operate in vacuum under high thermal and neutron fluxes over 20 years without maintenance, ruling out standard engineering solutions. In fact, these conditions are unprecedented even on fusion devices. Hence, qualification R&D efforts are extensive, because if a shutter fails, so does the respective diagnostic.</P> <P>Shutter design tasks are widespread among Domestic Agencies and their suppliers, because every shutter is part of the diagnostic it shall protect when not in use. However, as these highly resembling systems have obvious synergy potential, a coordination strategy for all ITER shutters was implemented at IO.</P> <P>An extensive shutter experience collection including failure reports from 14 fusion devices was performed. These are summarized in the present work. For the first time, the state-of-the-art of shutters is thereby defined and assessed as to its applicability to ITER. Furthermore, design-driving environmental effects due to the specific operating conditions are recalled and evaluated. The findings of both assessments are put into context with the current designs of all ITER shutters. In a next step, these are reviewed with emphasis on synergies between different shutter systems. Finally, recommendations on necessary prototyping and generic components are given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Plasma-near first mirrors of ITER optical diagnostics are protected by 63 so-called <I>Diagnostic Shutters.</I> </LI> <LI> Harsh conditions rule out standard engineering solutions. </LI> <LI> If a shutter fails, so does its diagnostic, impeding ITER operation. </LI> <LI> As a design starting point, the state-of-the-art was defined by an extensive experience collection, the most frequent causes of failure being increased friction, standard mechanical problems and operational loads. </LI> <LI> All current ITER shutter designs were reviewed, yielding a limited set of <I>critical</I> components: Actuators, bearings and vacuum feedthroughs. </LI> <LI> Consequent recommendations for necessary R&D in an integrated strategy for all shutters are presented. </LI> </UL> </P>
Wideband RF Radiation from a Nonlinear Transmission Line with a Pre-magnetized Ferromagnetic Core
J.-W. Ahn,S. Y. Karelin,V. B. Krasovitsky,H.-O. Kwon,I. I. Magda,V. S. Mukhin,O. G. Melezhik,V. G. Sinitsin 한국자기학회 2016 Journal of Magnetics Vol.21 No.3
Experimental results and data of numerical simulations are presented, concerning generation of wideband radio frequency (RF) oscillations in a nonlinear transmission line (NLTL) which contains a pre-magnetized core of ferrite material. Emphasis is made on the means for extracting the RF signal from the line, in order to radiate it into free space. Antennas of two types that can be used for the purpose are considered, both featuring a coaxial design. This permits availing of the principal advantages of coaxial systems, such as operation in the mode of a traveling TEM wave; wide range of the transmitted frequencies, and a reasonably simple design. The antennas studied, specifically a disc-cone dipole (DCD) and an impulse reflector antenna (‘Half-IRA’, or HIRA type) differ significantly in effective width of the radiated spectrum and in spatial characteristics of the radiated field in far region.