Design of a Compact Sub-Terahertz Gyrotron for Spectroscopic Applications

2010

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Coherent sources of radiation in the sub-terahertz and the terahertz frequency range are in great demand for various spectroscopic studies (e.g. electron spin resonance spectroscopy, DNP/NMR spectroscopy etc.). The required levels of the output power as well as the needed specific spectral characteristics make the gyrotrons the most promising and high-performance devices for such applications. Recently, an initial design of a versatile second harmonic gyrotron utilizing a compact cryo-free 8 T superconducting magnet has been accomplished. In this paper we present an optimized resonator for this gyrotron. Instead of a regular (cylindrical) part as in the conventional cavities it contains an uptapered section. Such configuration offers a significant increase of the efficiency and improves the overall performance of the tube. We outline briefly the underlying theory, present and discuss the results of the numerical experiments carried out during the optimization process.

Section: Analysis Of Mode Competitionmentioning

confidence: 81%

“…Its initial design that includes both the design of the electron-optical system (EOS) and the resonant cavity was presented in [1]. It is expected that the tube will operate at the second harmonic of the cyclotron frequency and will generate radiation in a CW regime with an output power of about 100 W and frequency tunable to up to 424 GHz, respectively.…”

mentioning

confidence: 99%

Design of an Optimized Resonant Cavity for a Compact Sub-Terahertz Gyrotron

Dumbrājs

2010

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“…From the other side, it is clear that when used as radiation sources in a sophisticated laboratory environment it is easier to embed them into the rest of the equipment if their dimensions are smaller. In recent years, the availability of compact cryo-free superconducting magnets has made it possible to develop much more compact gyrotrons [18][19][20]. According to the nomenclature adopted at FIR UF, these recently developed devices are marked by the letter "C", which stands for "compact".…”

Section: Figure 1: Gyrotron Fu Cw I Equipped With a Corrugated Wavegu...mentioning

confidence: 99%

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

2016

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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.

“…Bulky and heavy devices like conventional gyrotrons are not suitable for such systems. This motivated us to develop a concept of a compact gyrotron [41,42], which is based on the utilization of compact liquid He-free superconducting magnets and slim tubes with a special design allowing its insertion in the relatively small diameter bore of the solenoid. The mentioned special design envisages also development of an optimized low-voltage and low-current MIG with reduced (minimized) radial dimensions.…”

Section: Recently Developed Gyrotrons Members Of the Fu Cw C And Fu mentioning

confidence: 99%

Development and Applications of High—Frequency Gyrotrons in FIR FU Covering the sub-THz to THz Range

2012

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Powerful sources of coherent radiation in the sub-terahertz and in the terahertz frequency range of the electromagnetic spectrum are necessary for a great and continuously expanding number of applications in the physical research and in various advanced technological processes as well as in radars, communication systems, for remote sensing and inspection etc.. In recent years, a spectacular progress in the development of various gyrodevices and in particular of the powerful high frequency (sub-terahertz and terahertz) gyrotron oscillators has demonstrated a remarkable potential for bridging the so-called terahertz power gap and stimulated many novel and prospective applications. In this review paper we outline two series of such devices, namely the Gyrotron FU Series which includes pulsed gyrotrons and Gyrotron FU CW Series which consist of tubes operated in a CW (continuous wave) or long pulse mode, both developed at the FIR FU Center. We present the most remarkable achievements of these devices and illustrate their applications by some characteristic examples. An outlook for the further extension of the Gyrotron FU CW Series is also provided.