Coherent summation of emission from relativistic Cherenkov sources as a way of production of extremely high-intensity microwave pulses

Ginzburg, Naum S. and Cross, Adrian W. and Golovanov, Anton A. and Phelps, Alan D. R. and Romanchenko, Ilya V. and Rostov, Vladislav V. and Sharypov, Konstantin A. and Shpak, Valery G. and Shunailov, Sergey A. and Ul'masculov, Marat R. and Yalandin, Michael I. and Zotova, Irina V. (2016) Coherent summation of emission from relativistic Cherenkov sources as a way of production of extremely high-intensity microwave pulses. IEEE Transactions on Plasma Science, 44 (4). pp. 377-385. ISSN 0093-3813 (https://doi.org/10.1109/TPS.2016.2517670)

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Abstract

For relativistic Cherenkov devices, we investigate the process of high-power microwave pulse generation with its phase correlating to the sharp edge of an e-beam current pulse. Our theoretical consideration is referred to quasi-stationary and superradiative (SR) generation regimes when spontaneous emission of the e-beam edge serves as the seed for the development of further coherent oscillations. Phase correlation of the excited microwave pulses with the characteristics of the current pulse front and/or an initial external electromagnetic pulse has been additionally confirmed by particle-in-cell simulations. Pulse-to-pulse stability of the radiation phase within several percents of the oscillation period makes it possible to arrange multichannel schemes producing mutually coherent microwave pulses. In the experiments that have been carried out, the cathodes of independent generators were powered by identical accelerating pulses from strictly synchronized voltage modulators, or by splitting the pulse from a single powerful modulator. For the 2-ns regime with the power of each Ka-band backward-wave oscillator about 100 MW, we demonstrate quadratic growth of the power density in the interference maximum of the directional diagram. In a short pulse SR regime, with the peak power of 600 MW in a single channel, for a four-channel 2-D array, we attained a 16-fold radiation intensity gain.

  • Item type:Article
    ID code:56141
    Dates:
    Date
    Event
    29 January 2016
    Published
    29 January 2016
    Published Online
    4 January 2016
    Accepted
    Notes:© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:13 Apr 2016 12:56
    Last modified:08 Apr 2024 22:50
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/56141
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