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Design and Analysis of Multilayer Solenoid Coil for Faraday Modulator
摘要： A well-designed polarimeter is integral to the realization of the highly sensitive atomic magnetometer. Amongst various detection schemes, optical polarimetry based on Faraday modulator is most commonly used owing to its angular sensitivity at low-frequency range. The multilayered solenoid coil is the key component of Faraday effect based optical detection system. This paper primarily deals with design and analysis of multilayered coil of Faraday modulator. All deterministic parameters that affect the optimum design have been identified and analyzed. Mathematical expressions have been obtained for axial field homogeneity; modulation depth and power dissipation manifesting direct dependence on coil geometry. The design parameters of the coil are optimized with respect to axial magnetic field homogeneity over region of interest and reduced power losses with suitable geometric construction. The influence of different geometrical and electromagnetic parameters on optimum design has been highlighted and guidelines for design procedure are given. Theoretical results have been compared with simulation and experimental results. The mathematical formulation could be implemented in a computer program for recurrence design and to assist the realization of an optimized design of Faraday modulator coil.
关键词： solenoid coil,Faraday modulator,modulation depth,magnetic field homogeneity,power dissipation
更新于2025-09-23 15:19:57
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Long-Pulse Uncooled Copper Magnet for Gyrotron
摘要： The operation of a gyrotron requires a strong, stable magnetic ?eld over time. Working in the CW mode requires complex/cryogen solenoid cooling systems. Working in the pulse mode is possible with a simple solenoid, but only for short pulses, typically up to 50 μs. In this article, an intermediate working point for the gyrotron is presented: a pulsed gyrotron with a simple uncooled solenoid, which is capable of producing relatively long pulses of ～10 ms. To power a longer pulse with a simple solenoid, a super-capacitor (SC)-based system has been designed, which enables the extension of the operation of pulsed gyrotrons to tens of milliseconds, while keeping the system simplicity, without a cooling system for the solenoid. The setup was realized and a 27-ms current pulse of 1.1 kA was obtained through a gyrotron with a simple copper solenoid with a stability of ～0.3%. A 5-kW/10-ms radiation pulse at 28 GHz was measured from the gyrotron. This setup enables the use of a rather simple solenoid and a gyrotron and still obtains a rather long radiation pulse. This concept may open a new regime for pulsed gyrotrons.
关键词： Gyrotron,long pulse,magnetic ?eld,solenoid,millimeter wave
更新于2025-09-11 14:15:04
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[IEEE 2018 15th International Multi-Conference on Systems, Signals & Devices (SSD) - Yassmine Hammamet, Tunisia (2018.3.19-2018.3.22)] 2018 15th International Multi-Conference on Systems, Signals & Devices (SSD) - Design and Simulation of a 10 GHz VCO Using an RF MEMS Solenoid Inductor
摘要： This paper reports the design and simulation of a 10 GHz VCO using a RF MEMS solenoid inductor. We have studied four solenoid inductors using an FEM software: we have focused our work to evaluate the effect of dielectric substrate and metal on the inductors responses. Higher performances are obtained using copper coil and SU8 dielectric substrate: SRF= 20.8 GHz, Qmax= 60.9, and L = 2.6 nH at 10 GHz. Afterwards, we have designed and investigated a cross-coupled CMOS VCO based on the best RF MEMS solenoid inductor. The obtained results show a wide tuning range TR = 46% for frequency varying from 10 GHz to 14.6 GHz; and also a good linearity of frequency variations in response to control voltage. Moreover, output signals present a high voltage upper than 1.2 V and a low phase-noise PN = -102.37 dBc/Hz at 1 MHz. In addition, the spectral analyze show that the output peak power reaches 14.56 dBm at a center frequency of 10 GHz; the second harmonic is less than -58.9 dBm.
关键词： high frequency,VCO,MEMS,solenoid inductor,wide band
更新于2025-09-04 15:30:14