Life Test Studies on Dispenser Cathode With Dual-Layer Porous Tungsten

Zhang, Mingchen; Yu, Shiji; Wang, Yu; Zhang, Honglai

doi:10.1109/ted.2014.2323258

Cited by 8 publications

(2 citation statements)

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“…TWT has the merit of high reliability, long lifetime, high gain, and large power which is one of the most extensively used vacuum electronic devices [27], thus it is widely applied in the area of aerospace. TWT mainly consists of an electronic gun, slow-wave structure, RF input and output, permanent magnet and collector [28]. The cathode is an important part of the electron gun, which determines the life of TWTs under good vacuum conditions [29], and it is called the heart of TWT.…”

Section: Case Application and Sensitivity Analysismentioning

confidence: 99%

Nonlinear Doubly Wiener Constant-Stress Accelerated Degradation Model Based on Uncertainties and Acceleration Factor Constant Principle

Wang

2021

Applied Sciences

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Although Wiener process models with the consideration of uncertainties, which are nonlinearity, random effects, and measurement errors, have been developed for lifetime prediction in the accelerated degradation test (ADT), they fail to describe the real degradation process because these models assume that the drift parameter correlates with the applied stress, while the diffusion parameter is constant. This paper put forward a nonlinear doubly Wiener constant-stress accelerated degradation model, where both diffusion and drift parameters were compatible with the applied stress according to the acceleration factor constant principle. When degradation data were available, we obtained the unknown parameters by applying a maximum likelihood estimation (MLE) algorithm in the constant-stress ADT (CSADT) model taking uncertainties into account. In addition, the proposed model’s effectiveness was validated through an illustrative example, and an application to the traveling wave tube (TWT) was carried out to demonstrate the superiority of our model in practical applications.

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Section: Case Application and Sensitivity Analysismentioning

confidence: 99%

Nonlinear Doubly Wiener Constant-Stress Accelerated Degradation Model Based on Uncertainties and Acceleration Factor Constant Principle

Wang

2021

Applied Sciences

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“…And Zhang set dual-layer porous tungsten dispenser cathode temperatures at 980 • C, 1020 • C, 1060 • C, and 1100 • C separately to test working life and obtained a cathode life of 1.9×105 h [6]. In the report [7], an accelerated lift testing is presented for M-type dispenser cathode operating over two years, however the cathode life is not obtained yet and the testing is continuing. As mentioned above, the cathode working life can be obtained within a short period by ALT at high temperatures, although the need remains for an ALT method for the cathode in storage.…”

Section: Introductionmentioning

confidence: 99%

Accelerated life method and assessment for storage vacuum electronic device

2019

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We proposed an accelerated life testing method for the storage vacuum electronic devices (SVED) based on pressurization according to the relationship between gas inflow rate and pressure. And then a storage life assessment model was presented, using the cathode current to evaluate the SVED performance. Consequently, a test platform was established to verify the ALT method by storing three SVEDs in air for 10y and at 4.5 atm within its pressure limit for 5m. The results showed that, when pressurization, the cathode current dropped faster than when stored in air. And the expected storage life of the three SVEDs decreased from 10.4y, 15.5y and 31.4y respectively when stored in air to 2.6y, 3.9y and 10.0y respectively when stored at 4.5 atm. Also, leak plays a more important role than permeation in determining the storage life of the SVED.

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