DocumentCode :
2437738
Title :
Development of THz gyrotrons in FIR FU for application to high power THz technologies
Author :
Idehara, T. ; Ogawa, I. ; Mori, H. ; Kobayashi, S. ; Agusu, La ; Tatematsu, Y. ; Mitsudo, S. ; Saito, T.
Author_Institution :
Res. Center for Dev. of Far Infrared Region, Univ. of Fukui, Fukui
fYear :
2008
fDate :
15-19 June 2008
Firstpage :
1
Lastpage :
1
Abstract :
Recently, a gyrotron in FIR FU with a 21 T pulse magnet achieved the breakthrough of 1 THz. In the gyrotron, a demountable gyrotron tube is installed on the center axis of 21 T pulse magnet. In the operation test, a high voltage pulse is applied to electron gun installed in the region of the additional coils for controlling the injection point of electron beam in the cavity region. When B in the cavity region is changed, many cavity modes are excited at the fundamentals and second harmonics of electron cyclotron frequency. The second harmonic radiation is separated from the fundamental by using a high pass filter. Observed frequencies range from 395 GHz to 1,016 GHz. The maximum frequency 1,016 GHz is achieved by the second harmonic operation of TE4.12 cavity mode. Corresponding field intensity B is 19.1 T. Now we are trying to increase the frequency by increasing B. For the convenience of the application, CW gyrotrons (Gyrotron FU CW Series) are being developed. Gyrotron FU CW I has been developed and succeeded in the CW operation at 300 GHz under high power of 2.2 kW. The next gyrotrons, Gyrotron FU CW II and III have also been developed. The parameters are as follows: around 400 GHz, 100 W for Gyrotron FU CW II and 1 THz, 100 W for Gyrotron FU CW III under CW operation. These gyrotrons will be used for development of high power THz technologies, for example, Plasma diagnostics, DNP-NMR for protein research, etc.
Keywords :
cyclotron resonance; electron beams; gyrotrons; infrared sources; microwave generation; submillimetre wave generation; CW gyrotrons; FIR FU; Far Infrared Region; Fukui University; Gyrotron FU CW III; TE4.12 cavity mode; THz gyrotron development; cavity region magnetic field; demountable gyrotron tube; electron beam injection point control; electron cyclotron frequency fundamental harmonic; electron cyclotron frequency second harmonic; electron gun; excited cavity modes; frequency 300 GHz; frequency 395 GHz to 1016 GHz; high power THz technologies; high voltage pulses; magnetic flux density 19.1 T; magnetic flux density 21 T; power 100 W; power 2.2 kW; pulse magnet; Coils; Cyclotrons; Electron beams; Finite impulse response filter; Frequency; Gyrotrons; Magnetic separation; Power harmonic filters; Testing; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 2008. ICOPS 2008. IEEE 35th International Conference on
Conference_Location :
Karlsruhe
ISSN :
0730-9244
Print_ISBN :
978-1-4244-1929-6
Electronic_ISBN :
0730-9244
Type :
conf
DOI :
10.1109/PLASMA.2008.4590801
Filename :
4590801
Link To Document :
بازگشت