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Baraut, India

Kumar N.,Indian Central Electronics Engineering Research Institute | Alaria M.K.,Indian Central Electronics Engineering Research Institute | Singh U.,Indian Central Electronics Engineering Research Institute | Bera A.,Indian Central Electronics Engineering Research Institute | And 2 more authors.
Journal of Infrared, Millimeter, and Terahertz Waves | Year: 2010

A beam tunnel for a 42 GHz, 200 kW gyrotron for an Indian TOKAMAK system has been designed. The initial design of the beam tunnel has been carried out on the basis of the required electron beam parameters at the interaction cavity and the electron beam simulation of the magnetron injection gun. The design optimization of the beam tunnel has been done with the help of 3-D simulation software CST-Microwave Studio. In the simulation, the absorption, the reflection and the transmission of RF power by the beam tunnel have been analyzed. Three different lossy ceramics, Al 2O 3-SiC, AlN-SiC and BeO-SiC have been investigated during the simulation. The simulation results obtained with CST-Microwave Studio have been validated with another 3-D simulation software HFSS. The Q value of the beam tunnel for different ceramic material has also been analyzed to investigate the parasitic mode excitation in the beam tunnel. © 2010 Springer Science+Business Media, LLC. Source


Different Schiffbases derived by nucleophilic addition of (i) 4-amino-3-ethyl-5-mercapto-s-triazole and 4-amino-5-mercapto-3-n-propyl-s-triazole to p-chlorobenzaldehyde, 2-acetyl pyridine, 4-methyl acetophenone, 2,5-dinitroacetophenone (ii) 4-amino-5-mercapto-3-trifluoromethyl-s-triazole to p-chlorobenzaldehyde and 4-methylacetophenone and their metal complexes of Ni(ii), Cu(ii), have been synthesized and characterized by elemental analysis, IR, PMR, Electronic magnetic and conductance measurement. Source


Schiffbases 5-phenylazo salicylidene-3-Hydrazino-5,6-Diphenyl-1,2, 4-Triazine was prepared by the dissolving of 3-Hydrazino-5,6-diphenyl-1,2,4-triazine dropwise to the ethanolic solution of 5-phenylazo salicylaldehyde (PAS). The ligand and Cu(II), Co(II), Zn(II), Cd(II), Hg(II) metal complexes were screened against selected fungi and bacteria to examine their antimicrobial properties. gram positive bacteria (Bacillus substilis and Staphylococcus aureus) and gram negative bacteria (Escherichia coli, Klebsiella pneumonia, Pseudomonos aerogens, Salmonella paratyphi B and Proteus vulgaris). Source


Kumar N.,Indian Central Electronics Engineering Research Institute | Kumar N.,JV College | Singh U.,Indian Central Electronics Engineering Research Institute | Kumar A.,Indian Central Electronics Engineering Research Institute | And 3 more authors.
Journal of Fusion Energy | Year: 2010

This paper presents the design of 127.5 GHz ITER start-up gyrotron interaction cavity. Particle-in-Cell electromagnetic simulation approach has been used for the cold cavity and beam-wave interaction analysis. In-house developed code GCOMS has been used for the mode selection. TE24,8 mode has been chosen as the operating mode. The simulation results show the output power more than 1.5 MW at the operating frequency of 127.8 GHz and the cavity centre magnetic field of 5.1 T. The study of the parametric dependency of the output power and the efficiency on the electron beam and the cavity geometry parameters has also been carried out. © 2010 Springer Science+Business Media, LLC. Source


Kumar N.,Indian Central Electronics Engineering Research Institute | Kumar N.,JV College | Kumar A.,Indian Central Electronics Engineering Research Institute | Singh U.,Indian Central Electronics Engineering Research Institute | And 3 more authors.
International Journal of Thermophysics | Year: 2011

Thermal and structural analysis for a 120 GHz, 1 MW gyrotron interaction cavity and the effect of structural deformation on the operational mode excitation is presented. Finite element analysis codes ANSYS and COSMOS have been used for the thermal and structural simulation. The values of the water flow rate and the hydraulic diameter of the outer jacket have been optimized. The effect of the maximum radial expansion of the interaction cavity on eigenfrequency and mode excitation has also been analyzed. The change in eigenfrequency for the operating mode due to thermal expansion is 0.606GHz. This value is very near the theoretically calculated value and under the tolerance limit of the maximum frequency deviation for the gyrotron operating mode. © Springer Science+Business Media, LLC 2011. Source

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