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Multistage depressed collector (MDC) plays an important role in enhancing overall efficiency of a space TWT. A high efficiency four-stage depressed collector has been designed for Ka band 40W high efficiency helix TWT using EGUN code coupled with In-house developed pre-processor, and post processor modules. The spent beam data has been used from In-house developed SUNRAY 2.5-D code, a large signal...
In this paper, a low perveance (0.14 mup) convergent electron gun with dual anodes has been designed using codes EGUN (2D), TRAK (2D), OPERA (3D) and OMNITRAK (3D) for Ka-band helix (TWT) for space applications. Pierce type electron gun with an electrically isolated beam forming electrode (BFE), control anode (A1) and an ion barrier anode (A2) has been opted. An M-type dispenser cathode with low cathode...
Helical slow wave structure (SWS) for Ku-band 140 W short length space TWT has been designed in a single section to achieve the desired saturated RF output power 140 W, gain 25 dB and electronic efficiency more than 28% over the frequency band of 10.9 to 11.7 GHz. This short-length TWT has been designed for a microwave power module (MPM). In-house developed one-dimensional large signal model (SUNRAY-1D)...
Travelling wave tubes (TWTs) are power amplifier for communication satellite. As the electron gun plays a significant role in determining the life and reliability of the space TWT, the same has been subjected for 3-dimensional thermal and structural analysis using FEA code COSMOS and ANSYS. Expansion in different electrodes like cathode, beam focus electrode (BFE) and anode in axial and radial direction...
A dual anode convergent electron gun of perveance 0.14 mup has been designed for Ka-Band helix Traveling Wave Tube (TWT) which would ultimately have application in satellite communications. Gun has been designed using codes EGUN, TRAK & OMNITRAK. Pierce type electron gun with isolated beam forming electrode (BFE) & M-Type dispenser cathode with 3.1 mm button diameter has been opted. It consists...
Efficiency of Space-TWT is of prime concern along with the long life and high reliability. The collector efficiency plays a major role in determining the desired overall tube efficiency. Various collector efficiency enhancement techniques are employed. This paper describes the use and development of technology of carbon coated OFHC copper electrodes in multi-stage depressed collector for the enhancement...
A Ku-band 140 W space TWT of gain (>55 dB), electronic efficiency (>24%), collector efficiency (>75%), overall efficiency (>55%), I/M components (<-12 dBc) for frequency 10.9-11.7 GHz has been designed and developed for satellite communication system. This paper presents critical design issues and approach related to different assemblies like electron gun, PPM focusing, helix SWS, input...
The electron gun and PPM focusing system have been designed and developed for above VPB-TWT. M-type dispenser cathode and electrically isolated BFE has been used. The gun adapter and the anode have been made of Cu-Ni and molybdenum respectively to get desired magnetic flux at the cathode. Compact electron gun assembly has been designed. High voltage analysis, theoretical as well as experimental, is...
A low perveance (0.22 muP) electron gun for Ku-band 140W space traveling wave tube (TWT) has been designed, using E-GUN and TRAK codes. Pierce type electron gun with an electrically isolated beam forming electrode (BFE) and an ion barrier anode (A0) has been opted. An M-type dispenser cathode with low cathode
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