
Rs ShindeRaja Ramanna Centre for Advanced Technology | RRCAT · Accelerator Magnet Technology Division
Rs Shinde
M.Tech (Ele) -Electromagnetics
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28
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Introduction
Publications
Publications (28)
Ferrite circulators are most widely used microwave devices to provide isolation between RF source and mis-matched cavity, by circulating reflected RF power to third port terminated with matched termination. Under indigenous circulator development programme at RRCAT Indore, high power 650 MHz stip-line ferrite circulator has been designed and optimi...
This paper presents the effect of magnetic permeability on the permittivity measurement using coaxial line reflection technique. It discusses in detail about the design aspects, analysis and simulation of the slotted co-axial sample and fixture for dielectric characterization of the ferrites and garnets possessing both dielectric and magnetic prope...
Ferrite circulators are required to provide isolation between mismatched cavity and RF source. As a part of indigenous circulator development program, disk resona-tor for high power 505.8 MHz strip line circulator has been designed and modeled using CST Microwave Studio for RF system of INDUS-2 at RRCAT, Indore. Indium doped Calcium vanadium garnet...
High power circulators are purely ferrite material oriented design. In this paper, R&D, fabrication and characterization of garnets have been reported in relation to ferrite disc resonators and high power circulators. The magnetocrystalline structure of the calcium-vanadium-yttrium-iron garnets (CVG) have been re-engineered by optimum indium substi...
Herein, we report a facile microwave-assisted hydrothermal method for the preparation of yttrium iron garnet (YIG, Y3Fe5O12)nanocrystals and realized the synergy between its structural and magnetic properties. The as-prepared powder thermal stability was characterized in detail by using thermogravimetric-differential thermal analysis (TG-DTA). The...
Gadolinium substituted yttrium iron garnet (Gd: YIG: Y3−xGdxFe5O12 where x = 0, 0.25, 0.5, 0.75, 1, 1.25, 1.5) nanopowders were synthesized by microwave hydrothermal method. Phase structure of synthesized powders was examined using fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) which revealed a cubic garnet structure. Sp...
Ferrite circulators are required to provide isolation between mismatched cavity and RF source. As a part of indigenous circulator development program, a 476 MHz strip line circulator has been designed and modeled using CST Microwave Studio, for RF system of Infra-Red Free-Electron Laser at RRCAT, Indore. Circulator subsystems viz. calcium vanadium...
The effect of substitution of nonmagnetic Al
3+
ions on the structural and electromagnetic properties were studied in nanocrystalline
ferrite series of Mg0.8Cu0.2
Al
xFe1.95-xMn0.05O4 where x varies 0-0.4 in steps of 0.1. This series was synthesized by using microwave hydrothermal method. The nanocrystalline
ferrite phase was observed at temperatur...
Nanocrystalline Y3-xGdxFe5O12 (where x=0, 0.2, 0.4, 0.6) garnets were synthesized
using microwave hydrothermal (M-H) method by controlling process parameters such as
temperature, pressure and pH. Phase structure of all the powders was confirmed by using Xray
diffraction (XRD) from which the crystallite size is found to be in the range of 11-21 nm....
Nanocrystalline Y3-xGdxFe5O12(where x=0, 0.2, 0.4, 0.6) garnets were synthesized using microwave hydrothermal (M-H) method by controlling process parameters such as temperature, pressure and pH. Phase structure of all the powders was confirmed by using X-ray diffraction (XRD) from which the crystallite size is found to be in the range of 11-21 nm....
A strip line directional coupler is designed and simulated using FDTD, for low insertion loss and directivity of 40 dB, optimized up to 10 kW RF power at 505.8 MHz. This will be used in circulator testing, and other high frequency applications for reflection measurement in transmission lines.
Nanocrystalline SrFe12019 has been prepared by
microwave hydrothermal method at 473 KJ90 min, subsequently
annealed at different temperatures using microwaves (2.45GHz).
The average particle size of the powders was found to be 48 nm.
The plate shape grains were observed in FE-SEM at 1073 K. The
crystals exhibited the typical hexagonal ferrite growt...
Nanocrystalline
Ni0.94Co0.03Mn0.04Cu0.03Fe1.96-xAlxO4(x
= 0,0.1,0.3,0.5,0.7and0.9) were synthesized using microwave hydrothermal
method at 160°C/40 min. The synthesized powders were characterized
using XRD, TEM and FTIR. The nanopowders were sintered using microwave
sintering method at 950°C/30 min. The prepared samples were
characterized using XRD...
This paper presents the development of complex permeability measurement
set up for characterization of specially ferrites & garnets to be
used in ferrite circulator development, and other high frequency
applications. Set up consists of 8714 ES network analyzer, in house
developed movable short coaxial fixture, and complex mode calculation
software...
Due to high resistivity and low microwave losses, gadolinium iron garnets (GdIG) are useful materials for non-reciprocal devices such as circulators or isolators. Keeping the miniaturization and cost reduction in mind, the trend is to modify the conventional methods of preparation of samples. In this connection we have synthesized nanocystalline Gd...
A series of
Li0.5(1-x)ZnxFe(2.5-x/2)O4(x<=1.0)
spinel ferrite powders was prepared using a novel citrate-gel combustion
method at moderate temperature 100°C. A single phase cubic crystal
structure formed in the heat-treated as-prepared powders is determined
in terms of X-ray diffraction patterns. Saturation magnetization (Ms)
expressed in magneton...
The aim of present research is to study the influence of sintering temperature on the preparation of nanocrystalline Yttrium Iron garnet (YIG) with improved magnetic properties. The nanocrystalline YIG powders were synthesized using Microwave-Hydrothermal (M-H) method. The synthesized powders were characterized using X-ray diffraction (XRD) and Tra...
Modern accelerator design practice includes the use of high-quality ferrites for circulator applications with ever-increasing requirements on power handling ability. Modeling studies of new designs are of increasing economic importance, but are frequently hindered by lack of measured values of the ceramic loss factors. We have developed a nanocryst...
The pure YIG samples were prepared using microwave sintering method. The samples were sintered by using two types of sintering methods conventional and microwave. The sintered samples were characterized using XRD and SEM. The microwave sintering method was observed to be superior to conventional sintering process in the densification of pure YIG sa...
The aim of present research is to study the influence of sintering temperature on the preparation of nanocrystalline Yttrium Iron garnet (YIG) with improved magnetic properties. The nanocrystalline YIG powders were synthesized using Microwave-Hydrothermal (M-H) method. The synthesized powders were characterized using X-ray diffraction (XRD) and Tra...
Cobalt ferrite thin films have been deposited on fused quartz substrates by pulsed laser deposition at various substrate temperatures, T(s) (25 degrees C, 300 degrees C, 550 degrees C and 750 degrees C). Single phase, nanocrystalline, spinel cobalt ferrite formation is confirmed by X-ray diffraction (XRD) for T(s) > or = 300 degrees C. Conventional...
A fast extraction kicker magnet has been developed, which is used for extracting electron beams of 450 MeV from the 700 MeV Booster synchrotrons and injecting them into Indus-1, a 450 MeV electron storage ring. The fast extraction kicker magnet is of an open C-type lumped magnet design with a field strength of 624 Gauss at 800 Ampere. The fast kick...
Pulsed Septum magnets have been developed for injection of 500 – 600 MeV, e beam into 2.5 GeV Storage ring (Indus-2). A Pulsed magnet system consists of a thin & thick passive type Septum magnets kept inside Vacuum Chamber & Kicker Magnets. Thin & thick septum magnets were excited using 50 μs & 100 μs half sine wave pulse respectively. A magnetic f...
waveform. The magnet configuration, Ferrite yoke and power supply combinely determines the fast decay characteristics of kicker magnet system. A fast decay type kicker magnet has been developed for injection of two electron bunches (30 ns spacing) into 450 MeV storage ring (Indus-1). A kicker magnet system consists of a window magnet of lumped type...