Oscillation Characteristics of CW 300 GHz Gyrotron FU CWI

Saito, T.; Idehara, T.; Mitsudo, S.; Ogawa, I.; Hoshizuki, H.; Murase, H.; Sakai, Kiyomi; Zapevalov, V. E.; Malygin, O. V.; Khizhnjak, V.I.; Karpov, V. P.; Tai, Eugene M.

doi:10.1109/icimw.2006.368233

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…A series of gyrotrons operating at submillimeter wavelengths have been developed successfully and some relevant studies have been reported [4][5][6][7][8][9] . The series of THz gyrotrons have been developed at Research Center for Development of Far Infrared Region University of Fukui [10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…Besides that, gyrotrons are used in the experiments for plasma diagnostics and spectroscopy. One such newly emerging field is the Nuclear Magnetic Resonance (NMR) spectroscopy with signal enhancement through the Dynamic Nuclear Polarization (DNP) [4][5][6][7][8][9] , which is promising for research in protein studies, structural biology, solid-state physics, and other scientific areas One of the major obstacles to the use of high frequency millimeter and sub millimeter waves for scientific and technological applications is the fact that suitable, inexpensive, easy to use sources are not readily available.…”

Section: Introductionmentioning

confidence: 99%

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Design of a 0.25 THz second harmonic gyrotron oscillator

Huang

2008

Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology

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A design process for a second harmonic operation of a low ohm lossy TE03 mode 0.25 THz gyrotron has been presented. Mode competition and mode selection are carefully studied through the linear theory of CRM. The cavity are designed and optimized by using a time domain open cavity calculation code, and validated by using the famous FEM code HFSS. Interaction numerical investigations are carried out by using a self-consistent nonlinear theory cod. The influences of the magnetic field, current, voltage and the velocity ratio of the electron beam under the interaction between the electron beam and RF field are analyzed. The 14-kW 0.25 THz gyrotron with a predicted device efficiency of 39% is driven by a 25-kV 1.5-A (v /v // = 1.5, v z / v z = 6%) electron beam from a magnetron injection gun. A tapered magnetic field is adopted in the large signal simulation to prompt the electron efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a 0.25 THz second harmonic gyrotron oscillator

Huang

2008

Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology

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“…It operates in CW at 300 GHz and delivers output power of 1.8 kW [16]. The next one, the Gyrotron FU CW II, is being developed as a source of CW radiation with frequency 395 GHz and output power 100 W [17].…”

mentioning

confidence: 99%

Design of a CW 1 THz Gyrotron (Gyrotron Fu Cw III) Using a 20 T Superconducting Magnet

Agusu

Idehara

Mori

et al. 2007

Int J Infrared Milli Waves

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Design of a CW 1 THz gyrotron at second harmonic operation using a 20 T superconducting magnet has been described. The mode competition analysis is employed to investigate operation conditions of second harmonic mode, which is being excited at the frequency ranging from 920 GHz to 1014 GHz. The output power up to 250 watt corresponding to the efficiency of 4.16 percent could be achieved by using an electron beam with accelerating voltage 30 kV and current 200 mA. The important advantage of this gyrotron is that the single mode excitation at second harmonic, and extremely high frequency of the radiation, could be maintained even at high currents. It opens possibility to realize a high power radiation source at 1 THz. Such gyrotron is under construction at FIR Center, University of Fukui.

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Development of 394.6 GHz CW Gyrotron (Gyrotron FU CW II) for DNP/Proton-NMR at 600 MHz

Idehara

Ogawa

Agusu

et al. 2007

Int J Infrared Milli Waves

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Gyrotron FU CW II with an 8 T liquid He free superconducting magnet, the second gyrotron of the THz Gyrotron FU CW Series, has been constructed and the operation test was successfully carried out. It will be used for enhancing the sensitivity of 600 MHz proton-NMR by use of Dynamic Nuclear Polarization (DNP). The designed operation mode of the gyrotron is TE2,6 at the second harmonic. The corresponding frequency is 394.6 GHz. The real operation frequency is 394.3 GHz at TE06 mode, because of fabrication error of the diameter of the cavity. The operation is in complete CW at the output power of around 30 W or higher at the TE06 cavity mode. There are many other operation modes at the fundamental and the second harmonic. Typical output power of the fundamental and the second harmonic are higher than 100 W and 20 W, respectively. The highest frequency observed up to the present is 443.5 GHz at the second harmonic operation of TE6,5 mode. The measured results are compared with the theoretical consideration

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Oscillation Characteristics of CW 300 GHz Gyrotron FU CWI

Cited by 9 publications

References 2 publications

Design of a 0.25 THz second harmonic gyrotron oscillator

Design of a 0.25 THz second harmonic gyrotron oscillator

Design of a CW 1 THz Gyrotron (Gyrotron Fu Cw III) Using a 20 T Superconducting Magnet

Development of 394.6 GHz CW Gyrotron (Gyrotron FU CW II) for DNP/Proton-NMR at 600 MHz

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