Development and applications of submillimeter wave gyrotron FU series FIR FU Seminar PPPL 14 March 2005 Development and applications of submillimeter wave gyrotron FU series T. Idehara Research Center for Development of Far Infrared Region University of Fukui Contents 1. INTRODUCTION 2. DEVELOPMENT OF GYROTRON FU SERIES 3. APPLICATIONS OF GYROTRON FU SERIES 4. SUMMARY

International collaboration FIR FU International collaboration Development of submillimeter wave gyrotrons University of Sydney, School of Physics Karlsruhe Research Center Institute of Applied Physics, Russian Academy of Science Institute of Electronics, Bulgarian Academy of Science Development of quasi optical transmission system Stuttgart University, Plasma Research Institute Applications of submillimeter wave gyrotrons Princeton University, PPPL (Plasma scattering measurement) Karlsruhe Research Center (High quality ceramic sintering) Warwick University, NMR Center (High sensitive NMR by DNP)

FIR FU POWER vs. FREQUENCY (for high frequency radiation sources) Gyrotron - high power source in THz range POWER vs. FREQUENCY (for high frequency radiation sources)

High power THz source developed in FIR FU High power THz source - Gyrotron High power THz source developed in FIR FU 　GYROTRON FU SERIES

FIR FU THz Gyrotron THz Gyrotron using a pulse magnet GYROTRON FU SERIES will achieve breakthrough of 1 THz　 THz Gyrotron using a pulse magnet

Frequency, GHz 300 ± 2 High power 300 GHz Gyrotron FIR FU Maximal CW output power, kW 3.5, not less Range of CW output power, kW 0.5 - 3.5 Cavity radius, mm 　　　8.39 Cavity Q factor 　　　　6000 Type of gun 　　　　quasi-diode Material of Emitter 　　　LaB6 Maximal beam voltage, kV 　 16 ± 1 Maximal beam current, A 　1.1 ± 0.1 Beam radius, mm 　　　3.71 Pitch-factor 　　　　1.2-1.3 Output window diameter, mm 　　 80 Output window material 　　BN Output mode 　　　　wave beam Operating mode 　　 　TE22,8 Water cooling: flow rate (approximate), m3/hour 4 inlet pressure range, bar from 3.0 to 4.0 outlet pressure, bar 　　 0.5 maximal inlet temperature, 0C 　 30 Maximum field intensity, T 12

FIR FU PLASMA SCATTERING MEASUREMENTS Compact Helical System (CHS) at National Institute for Fusion Science, Toki, Japan f=352 GHz (TE161 mode), P=110 W

FIR FU SCATTERED SIGNAL FROM CHS PLASMA (time evolution and frequency spectra) Plasma production: (a) 200 kW ECH 53 GHz (b) 400kW ECH 106 GHz Plasma heating: (a) 1000 kW NBI #1 (b) 600 kW NBI #2 Magnetic field: 1.76 T Electron temperature: 600 eV Scattering region: 77 cm Scattering angle: 8.8 deg Frequency of gyrotron 352 GHz

ESR EXPERIMENTS USING A GYROTRON FIR FU ESR EXPERIMENTS USING A GYROTRON AS A RADIATION SOURCE The schematic drawing of ESR spectrometer with Gyrotron FU-IVA

24 GHz compact gyrotron ceramics sintering system FIR FU 24 GHz compact gyrotron ceramics sintering system Specification Output power　　0.1～ 2.5 kW (CW) Operating frequency 　 24.15 GHz 　　　　　　　　　　　(Second harmonic ) Mode　　 　 TE11 Magnetic field 　　 　 ～ 　0.45 T

FIR FU A NEW MEDICAL TECHNOLOGY (development of a catheter for a submillimeter wave) Frequency of gyrotron f=301 GHz, Output power P=20 W

FIR FU IRRADIATION ON LIVER OF LIVING RAT

FIR FU Summary 1.Development of high power THz source GYROTRON FU SERIES 　 High frequency:　890 GHz，　Breakthrough of 1 THz 　　High stability: frequency stability 10-10, amplitude stability 10-3 　　High harmonic operation: 5th harmonic operation by LOG 　　High purity moded operation: Mode purity 95% for several cavity modes 2. Conversion of gyrotron output to Gaussian mode Transmission with high efficiency 3. Devderlopment of high power THz technologies using a gyrotron as a radiation source 　 Submillimeter wave ESR　　 Gyrotron FU IV and FU IVA 　 Plasma scattering measurement　 Gyrotron FU II 　 High sensitive NMR by DNP 395 GHz gyrotron under development 　 Sintering of high quality ceramics　24 GHz and 300 GHz gyrotrons 　 New medical technology　 Gyrotron FU IV and 300 GHz,CW Gyrotron