Implementation of High Power Microwave Pulse Compressor

Karslı, Özlem; Doğan, Mustafa; Ahiska, Fatih; Surel, O. Orkun

doi:10.1109/tps.2019.2916050

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…The non-linear saturation developed at this stage is the origin of the induced electrostatic field which is responsible for the redistribution of particles along with the help of non-linearities, e.g. relativistic mass variation and ponderomotive force (Ghizzo 2013;Karsli et al 2019;Farina & Bulanov 2005).…”

Section: Early Stages Of the Instabilitymentioning

confidence: 99%

“…Such that the growth of the Buneman instability is assisted by the selfexcitation for sufficiently small time cycles(Galeev et al 1981) and likewise plasma triggering is observed in microwave pulse compressors built to obtain narrow high peak pulses(Karsli et al 2019). The following plasma behaviour such as new matched oscillations can result in higher amplitude pulse formation.…”

mentioning

confidence: 99%

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Stimulated emission–based model of fast radio bursts

Doğan

Ekşi

2020

Monthly Notices of the Royal Astronomical Society

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Fast radio bursts (FRBs) are bright, short-duration radio transients with very high brightness temperatures implying highly coherent emission. We suggest that the FRBs are caused by the self-focusing of an electron beam interacting with an ambient plasma right beyond the light cylinder radius of a neutron star. The magnetic field at the light cylinder radius is relatively high which can accommodate both young Crab-like systems and old millisecond pulsars addressing the diverse environments of FRBs. At the first stage, the intense pulsed-beam passing through the background plasma causes instabilities such that the trapped particles in local Buneman-type cavitons saturate the local field. The beam is then radially self-focused due to the circular electric field developed by the two-stream instability which leads to Weibel instability in the transverse direction. Finally, the non-linear saturation of the Weibel instability results in the self-modulational formation of solitons due to plasmoid instability. The resonant solitary waves are the breather-type solitons hosting relativistic particles with self-excited oscillations. The analytical solutions obtained for non-linear dispersion and solitons suggest that, near the current sheets, the relativistic bunches are accelerated/amplified by klystron-like structures due to self-excited oscillations by the induced local electric field. Boosted coherent radio emission propagates through a narrow cone with strong focusing due to radial electric field and magnetic pinching. The non-linear evolution of solitons and the stimulated emission are associated with the Buneman instability and the possibility of the presence of nanosecond shots in FRBs are investigated.

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Section: Early Stages Of the Instabilitymentioning

confidence: 99%

mentioning

confidence: 99%

Stimulated emission–based model of fast radio bursts

Doğan

Ekşi

2020

Monthly Notices of the Royal Astronomical Society

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“…Plasma sources are able to operate both in continuous and repetitive or pulsed operating conditions, allowing narrow or wide charge particle beams to be formed. Due to fast response times, a plasma switch can be used in microwave pulse compression (MPC) systems to reflect radio frequency (RF) waves, enabling high-power discharge [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of RF–Plasma Interaction Using a Low-Pressure DC Glow Discharge Tube for MPC

2023

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This paper aims to perform experimental validation of RF–plasma interaction behaviors for the purposes of wave transmission and reflection. Wave reflection from plasma is of interest as it finds applications in pulse compression and RF polarizer-based systems. Simulations are performed using a combination of Magic3D and COMSOL multiphysics to characterize the plasma–wave interaction and discharge tube properties. The goal is to generate plasma with characteristics that wholly reflect the incident electromagnetic wave. A glass tube of inner diameter 22 mm and length 100 mm, with 12 mm brass electrodes, is fabricated for plasma generation. Argon-based DC glow discharge is sustained at 500 volts at a pressure of 3.8 Torr. Plasma density is calculated to be 2.529×1019 m−3, with a corresponding plasma frequency of 7.18 GHz. Due to this higher frequency, a 3 GHz incident RF wave is reflected, as measured through S-parameter measurements using a network analyzer. Off and on states of the tube correspond to S11=−40 dB and S11=−13 dB, which show wave transmission and reflection, respectively. When the plasma column is ignited, the reflected wave has a phase difference of 180∘.

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