Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Khutoryan, Eduard; Idehara, T.; Кулешов, А. Н.; Tatematsu, Y.; Yamaguchi, Yuusuke; Matsuki, Yoh; Fujiwara, Toshimichi

doi:10.1007/s10762-015-0212-2

Cited by 25 publications

(4 citation statements)

References 11 publications

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“…In paper [83], the authors report the frequency stability of the free-running gyrotron ≈ 10 MHz. After applying PID stabilization, 10 hours of operation revealed a frequency deviation of 0.6 MHz.…”

Section: Cathode Voltage Control -Frequency Stabilizationmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Nowak

2022

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This paper outlines the principle of the DNP-NMR technique. The gyrotron, as a very promising microwave source for NMR spectroscopy, is evaluated. Four factors: power stability, power tuning, frequency stability, and frequency tuning determine the usability of the gyrotron device. The causes of instabilities, as well as the methods of overcoming limitations and extending usability are explained with reference to the theory, the numerical and experimental results reported by gyrotron groups.

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Section: Cathode Voltage Control -Frequency Stabilizationmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Nowak

2022

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“…In the subsequent studies, the technique of the output parameters stabilization based on PID control has been mastered, and now it is routinely used in the gyrotrons for DNP-NMR spectroscopy [45,46]. It allows stabilizing the output power and frequency separately [47] as well as simultaneously [48], although in the latter case, the levels of the stabilizations are lower. Nevertheless, however, such a trade-off provides sufficiently stable radiation for the mentioned spectroscopic experiments.…”

Section: Characteristic Features Of the Gyrotrons And Their Radiationmentioning

confidence: 99%

“…Nevertheless, however, such a trade-off provides sufficiently stable radiation for the mentioned spectroscopic experiments. Generally, what is nowadays typical for the DNP-NMR gyrotrons is a long-term frequency stabilization with 0.2-0.4 MHz frequency spectrum width (stabilization is better than 10 −6 ) [47].…”

Section: Characteristic Features Of the Gyrotrons And Their Radiationmentioning

confidence: 99%

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

et al. 2020

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The gyrotrons are powerful sources of coherent radiation that can operate in both pulsed and CW (continuous wave) regimes. Their recent advancement toward higher frequencies reached the terahertz (THz) region and opened the road to many new applications in the broad fields of high-power terahertz science and technologies. Among them are advanced spectroscopic techniques, most notably NMR-DNP (nuclear magnetic resonance with signal enhancement through dynamic nuclear polarization, ESR (electron spin resonance) spectroscopy, precise spectroscopy for measuring the HFS (hyperfine splitting) of positronium, etc. Other prominent applications include materials processing (e.g., thermal treatment as well as the sintering of advanced ceramics), remote detection of concealed radioactive materials, radars, and biological and medical research, just to name a few. Among prospective and emerging applications that utilize the gyrotrons as radiation sources are imaging and sensing for inspection and control in various technological processes (for example, food production, security, etc). In this paper, we overview the current status of the research in this field and show that the gyrotrons are promising radiation sources for THz sensing and imaging based on both the existent and anticipated novel techniques and methods.

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“…A proportional-integral-derivative (PID) feedback control system has been developed, which decreases the beam current fluctuations from 17 % to 0.5% and these of the output power from 15 % to 5 % by controlling the current of the heating filament of the cathode. More effective stabilization of the output power (up to 2%) has been realized by a feedback control that adjusts the voltage of the heater [37][38][39].…”

Section: Dnp-nmr Spectroscopymentioning

confidence: 99%

Gyrotrons for High-Power Terahertz Science and Technology at FIR UF

Idehara

Sabchevski

2016

J Infrared Milli Terahz Waves

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Correspondence should be addressed to idehara@fir.u-fukui.ac.jpIn this paper, we present the recent progress in the development of a series of gyrotrons at FIR UF that have opened the road to many novel applications in the high-power Terahertz science and technology. The current status of the research in this actively developing field is illustrated by the most representative examples in which the developed gyrotrons are used as powerful and frequency tunable sources of coherent radiation operating in a CW regime. Among them are high-precision spectroscopic techniques (most notably DNP-NMR, ESR, XDMR, and studies of the hyperfine splitting of the energy levels of positronium), treatment and characterization of advanced materials, new medical technologies.

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Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Cited by 25 publications

References 11 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

Gyrotrons for High-Power Terahertz Science and Technology at FIR UF

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