wave tube
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2021 ◽  
pp. 110-117
A. Tsudik ◽  
A. Glushkov ◽  
V. Ternovsky ◽  
P. Zaichko

The advanced results of computing the dynamical and topological invariants (correlation dimensions values, embedding, Kaplan-York dimensions, Lyapunov’s exponents, Kolmogorov entropy etc) of the dynamics time series of the  relativistic backward-wave tube with accounting for  dissipation and space charge field and other effects are presented for chaotic and hyperchaotic regimes. It is solved a system of equations for unidimensional relativistic electron phase and field unidimensional complex amplitude.  The data obtained make more exact earlier presented preliminary data for  dynamical and topological invariants of the relativistic backward-wave tube dynamics in  chaotic regimes and allow to describe a scenario of transition to chaos in temporal dynamics.   

Isabelle P. Maiditsch ◽  
Friedrich Ladich ◽  
Martin Heß ◽  
Christian M. Schlepütz ◽  
Tanja Schulz-Mirbach

Modern bony fishes possess a high morphological diversity in the auditory structures and their auditory capabilities. Yet, our knowledge of how the auditory structures such as the otoliths in the inner ears and the swim bladder work together remains elusive. Gathering experimental evidence on the in-situ motion of fish auditory structures while avoiding artifacts caused by surgical exposure of the structures has been challenging for decades. Synchrotron radiation-based tomography with high spatio-temporal resolution allows to study morphofunctional issues non-invasively in an unprecedented way. We therefore aimed to develop an approach that characterizes the moving structures in 4D (= three spatial dimensions+time). We designed a miniature standing wave tube-like setup to meet both the requirements of tomography and those of tank acoustics. With this new setup, we successfully visualized the motion of isolated otoliths and the auditory structures in zebrafish (Danio rerio) and the glass catfish (Kryptopterus vitreolus).

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 3018
Jinjing Luo ◽  
Jin Xu ◽  
Pengcheng Yin ◽  
Ruichao Yang ◽  
Lingna Yue ◽  

A phase shift that is caused by the machining errors of independent circuits would greatly affect the efficiency of the power combination in traditional multi-beam structures. In this paper, to reduce the influence of the phase shift and improve the output power, a multi-beam shunted coupling sine waveguide slow wave structure (MBSC-SWG-SWS) has been proposed, and a multi-beam overmoded flat-roofed SWG traveling wave tube (TWT) based on the MBSC-SWG-SWS was designed and analyzed. A TE10-TE30 mode convertor was designed as the input/output coupler in this TWT. The results of the 3D particle-in-cell (PIC) simulation with CST software show that more than a 50 W output power can be produced at 342 GHz, and the 3 dB bandwidth is about 13 GHz. Furthermore, the comparison between the single-beam sine waveguide (SWG) TWT and the multi-beam overmoded SWG TWT indicates that the saturated output power of the multi-beam overmoded SWG TWT is three times more than that of the single beam SWG TWT.

AIP Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 125214
Zhang Luqi ◽  
Yi Jiang ◽  
Wenqiang Lei ◽  
Rui Song ◽  
Peng Hu ◽  

Minxing Wang ◽  
Zewei Wu ◽  
Xiaoyi Liao ◽  
Ran Zhang ◽  
Yong Luo

2021 ◽  
Vol 49 (11) ◽  
pp. 3519-3523
Yanyan Tian ◽  
Hexin Wang ◽  
Guoxiang Shu ◽  
Yubin Gong ◽  
Wenlong He

2021 ◽  
Aaron Jensen ◽  
John Petillo ◽  
Serguei Ovtchinnikov ◽  
Igor Chernyavskiy ◽  
Alexander Vlasov

Xinyi Li ◽  
Hongxia Cheng ◽  
Guang Yang ◽  
Ying Li ◽  
Pengchao Huang ◽  

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