MEASURING AMPLITUDE AND FREQUENCY CHARACTERISTICS OF KINETIC INDUCTANCE IN SUPERCONDUCTING FILMS

2021 ◽  
Vol 0 (1) ◽  
pp. 106-110
Author(s):  
K.V. SHEIN ◽  
◽  
K.YU. ARUTYUNOV ◽  
V.V. ZAVIALOV ◽  
◽  
...  

This research was performed using thin superconducting strips in the shape of tightly packed meanders made of niobium nitride (NbN) ultrathin superconducting strips about 100 nm wide, 5 nm thick and up to 100 µm long. The structures revealed the effect of high kinetic inductance at temperatures lower than the critical temperature. Consideration was given to the temperature dependence of LC-circuit resonant frequency where a highlyinductive superconducting meander was used as a source of L inductance and а chip capacitor as a source of C capacitance. Experimental data point to the fact that kinetic inductance depends on temperature, since there was a shift in the resonant frequency at temperatures lower than the critical one relative to the normal state. This is indicative to the fact that in such systems impedance is changed due to growing kinetic inductance during the transition to the superconducting state. This effect is of relevance both in applied and basic research. When using different superconducting detectors, kinetic inductance can exert a distinct effect on their response rate. In basic research developments, where the on-chip implementation of charge (current) stabilization is required, high frequency impedance of connecting circuits is very useful.

2006 ◽  
Vol 27 (6) ◽  
pp. 495-497 ◽  
Author(s):  
J. Verd ◽  
A. Uranga ◽  
J. Teva ◽  
J.L. Lopez ◽  
F. Torres ◽  
...  

2013 ◽  
Vol 705 ◽  
pp. 258-263
Author(s):  
Fahimullah Khan ◽  
Yong Zhu ◽  
Jun Wei Lu ◽  
Dzung Dao

In this paper, a novel MEMS based LLC converter is proposed for on chip power supplies. The design is optimized based on commercially available Metal MUMPs process for fabrication. The resonant frequency is optimized at 20MHz and MEMS based variable capacitor is fabricated on the chip to tune the peak resonance frequency of circuit which varies due to the load variations. The Design is simulated in FEM based numerical software COMSOL and Intellisuite. According to analysis the magnetizing inductance of 42nH and leakage inductance of 40nH has been achieved from 16 mm2 rectangular coil transformer. The total capacitance of 1500pF has been achieved from parallel plate capacitors and variation of 3pF has been achieved from variable capacitor.


Author(s):  
E. V. Gurov ◽  
S. S. Uvaysov ◽  
A. S. Uvaysova ◽  
S. S. Uvaysova

Coil inductance and capacitor capacitance depend on overall dimensions, structure, and ambient factors. They do not vary with frequency. Reactive component impedance is determined by inductance or capacitance respectively, if active resistance is not considered. This is true for the frequencies which are significantly lower than the self-resonant frequency of the component. Parasitic parameters contribution increases on approaching the self-resonant frequency. Therefore, the componentʼs actual inductance and actual capacitance on operating frequency are defined. They are provided by manufacturers and differ from the nominal values. The actual values provide more accurate impedance of components near the considered frequency. Significant deviation from the considered frequency can cause impedance mismatch even more than the nominal values can provide. Frequency response of the high-frequency circuits such as analog filters and impedance match networks are determined by components impedance, not the nominal values. Thus, calculated values must be close to the actual values. The purpose of this article is to justify actual values application instead of nominal values.


2019 ◽  
pp. 3-8
Author(s):  
S.A. Vdovin ◽  
Ye.V. Gussev

Parameters of the H-resonator: the resonant frequency, the distribution of phases and amplitudes of the highfrequency field in the accelerating gaps are mainly determined by the load that forms the acceleration channel. When creating applied accelerators based on H-resonators, it is necessary to determine not only the parameters of the accelerating channel, but also the electrodynamics characteristics of the resonator, which have influence on the efficiency of high-frequency power use. The paper presents an analysis of the methods for modeling the load of accelerating H-resonators taking into account the stated requirements.


2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Roger Wördenweber

Abstract Vortex matter in superconducting films and devices is not only an interesting topic for basic research but plays a substantial role in the applications of superconductivity in general. We demonstrate, that in most electronic applications, magnetic flux penetrates the superconductor and affects the performance of superconducting devices. Therefore, vortex manipulation turns out to be a useful tool to avoid degradation of superconducting device properties. Moreover, it can also be used to analyze and understand novel and interesting physical properties and develop new concepts for superconductor applications. In this review, various concepts for vortex manipulation are sketched. For example, the use of micro- and nanopatterns (especially, antidots) for guiding and trapping of vortices in superconducting films and thin film devices is discussed and experimental evidence of their vortex guidance and vortex trapping by various arrangements of antidots is given. We demonstrate, that the vortex state of matter is very important in applications of superconductivity. A better understanding does not only lead to an improvement of the performance of superconductor components, such as reduced noise, better power handling capability, or improved reliability, it also promises deeper insight into the basic physics of vortices and vortex matter.


Sign in / Sign up

Export Citation Format

Share Document