Novel techniques for the thermal management of space-based, high-power microwave tubes

Rose, M.F.; Hyder, A. K.; Askew, R. F.; Chow, L. C.; Gilmour, A. S.; Faghri, Amir

doi:10.1109/16.88507

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Also, in order to prevent already reduced temperature of the cathode from undergoing any further decrease in its temperature, due care should be taken to minimize the heat dissipation from the cathode. [1,2] For this purpose, in the proposed gun, we provide a heat shield around the cathode around the cathode. The thickness and material property of the heat shield are the key parameters in maintaining the required cathode operating temperature; our study encompasses the effects of these parameters on heat dissipation.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic and thermal analysis of a dual-anode electron gun for space traveling-wave tubes

Gahlaut

Roy

Choudhury

et al. 2014

Journal of Electromagnetic Waves and Applications

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We propose the design of a dual-anode electron gun, so named due to the presence of an additional electrode, namely, the control anode in the vicinity of the cathode in addition to the ion-barrier anode and the ground anode. We found the potential of the control anode to play an important role in enhancing the life of a space traveling-wave tube. By a telemetric command, one could control the control anode potential with a view to enhancing the cathode current that would otherwise deteriorate with the progress of time. Further, due care was taken in the thermal design by providing a heat shielding of the cathode of the proposed dual-anode gun to ensure that the cathode, which is operated at a lower temperature for a longer cathode life, does not further suffer a decrease in temperatures due to heat dissipation. Furthermore, to compensate for the deterioration of the cathode current with the progress of time, we propose the application of a nominal change in the control anode potential by a telemetric command. The electrostatic and thermal simulations of the proposed dual-anode gun were carried out by the commercial simulation codes EGUN and ANSYS, respectively. The paper presents the effect of heat shield thickness and material property on the cathode temperature as well as the effect of the structural deformation caused by the axial and radial expansion of the cathode on electron beam optics, a demountable dual-anode gun was set up for validating the cathode temperature against simulation.

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Section: Introductionmentioning

confidence: 99%

Electrostatic and thermal analysis of a dual-anode electron gun for space traveling-wave tubes

Gahlaut

Roy

Choudhury

et al. 2014

Journal of Electromagnetic Waves and Applications

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“…In general, direct heat dissipation can take place through the radiator acting as heat sink. In case the system design does not permit immediate placement of passive radiator, heat pipes are used to transfer the system heat up to the radiator [6,7,9,10,17,18,31].…”

Section: Introductionmentioning

confidence: 99%

Cooling capacity of high porosity open-cell metal foams as passive cryogenic radiators

Dixit

Ghosh

2017

Cryogenics

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“…The amount of waste heat in the collector can be reduced by (i) making the collector highly efficient [3][4][5][6][7] and (ii) using proper thermal management [8][9][10]. A multistage depressed collector for Ka-band 40W space TWT has been designed with modification in the geometry to achieve high collector efficiency of ~90% [11].…”

Section: Introductionmentioning

confidence: 99%

Thermal Impact on the Performance of Highly Efficient Multi-stage Depressed Collector for Space TWT

et al. 2014

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In a travelling wave tube, much of the waste power is dumped into the collector. If the waste heat is not properly managed, it might pose a serious problem causing even failure of tube. In this paper, the optimal choice of thermal management of a highly efficient multistage depressed collector designed for a space TWT has been made based on several criteria. The structural deformations and stresses developed due to thermal impact have been evaluated. The influence of thermal deformations on the collector electrical performance and high voltage withstanding capability has been studied during hot condition.

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Novel techniques for the thermal management of space-based, high-power microwave tubes

Cited by 5 publications

References 2 publications

Electrostatic and thermal analysis of a dual-anode electron gun for space traveling-wave tubes

Electrostatic and thermal analysis of a dual-anode electron gun for space traveling-wave tubes

Cooling capacity of high porosity open-cell metal foams as passive cryogenic radiators

Thermal Impact on the Performance of Highly Efficient Multi-stage Depressed Collector for Space TWT

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