TITLE

Simultaneous projection and detection system of four different frequencies for microwave imaging reflectometry in Large Helical Device

AUTHOR(S)
Yoshinaga, T.; Nagayama, Y.; Kuwahara, D.; Tsuchiya, H.; Yamaguchi, S.; Kogi, Y.; Tsuji-Iio, S.; Mase, A.
PUB. DATE
October 2010
SOURCE
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D915
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A simultaneous projection/detection system of four different frequencies for microwave imaging reflectometry (MIR) was developed for three-dimensional observation of electron density fluctuations in the Large Helical Device (LHD). The microwave with four frequency components at 60.410, 61.808, 63.008, and 64.610 GHz is projected in a continuous-wave mode to illuminate the target LHD plasma. A two-dimensional horn-antenna mixer array (2D HMA) receives the reflected wave from the plasma as well as the wave from the local oscillator operating at 55.800 GHz. The first intermediate frequency (IF) signals at 4.610, 6.008, 7.208, and 8.810 GHz were confirmed to be obtained by downconversion of these microwaves using the 2D HMA. Each of these first IF components is filtered from each other and downconverted again for the superheterodyne detection. It was confirmed that both the amplitudes and the phases of the detected signals reflect the fluctuations in LHD plasmas.
ACCESSION #
54858128

 

Related Articles

  • Electron Penning trap for the generation of high density non-neutral plasmas. Schauer, M.M.; Mithcell, T.B.; Holzscheiter, M.H.; Barnes, D.C. // Review of Scientific Instruments;Sep97, Vol. 68 Issue 9, p3340 

    Describes an experiment to produce high density pure electron plasmas in a cryogenic Penning trap. Description of the apparatus and its operation; Summary of data acquired to date, and its interpretation; Possible uses and future work.

  • High power microwave line with arbitrary impedance matching capability for plasma applications. Ganguli, A.; Baskaran, R.; Naidu, P. A.; Raju, G. V. R. // Review of Scientific Instruments;Feb1989, Vol. 60 Issue 2, p244 

    The details of a high power microwave transmission line developed for plasma applications are presented. The line operates at 2.45 GHz and can handle about <=1 kW of cw microwave power with about 15%–20% insertion loss. A special feature of the line is its wide range impedance matching...

  • Prominent characteristics of the decay of a photoplasma generated by radiation from an annular sliding discharge. Popov, N. A. // Technical Physics;Jul98, Vol. 43 Issue 7, p790 

    The dynamics of the absorption of diagnostic microwave radiation in a decaying nitrogen photoplasma generated by a pulsed annular sliding discharge is modeled numerically. It is shown that the microwave absorption coefficient can vary nonmonotonically with time (as observed in the majority of...

  • Recent Progress in Understanding the Physics of Plasma-Filled, High-Power Microwave Sources. Nusinovich, G. S.; Bliokh, Y. P.; Abu-Elfadl, T. M.; Shkvarunets, A. G.; Goebel, D. M.; Carmel, Y.; Antonsen, T. M.; Granatstein, V. L. // AIP Conference Proceedings;2002, Vol. 625 Issue 1, p45 

    The use of plasmas for generating high-power microwaves is studied for more than 50 years. During the 1990's Plasma-Assisted Slow-wave Oscillators (PASOTRONs) were invented and actively developed at Hughes Research Lab (HRL). These devices have a number of unique and attractive features....

  • Numerical Investigation of a Microwave Discharge Driven by the H[sub 10]-Type Wave. Kairyev, N. Zh.; Kulumbaev, �. B.; Lelevkin, V. M. // Plasma Physics Reports;May2000, Vol. 26 Issue 5, p456 

    A two-dimensional numerical model is proposed for studying a steady microwave discharge driven by the H[sub 10]-type wave. The parameters of a discharge in nitrogen at atmospheric pressure are calculated. The results obtained agree qualitatively with the experimental data. � 2000 MAIK...

  • Planar microwave discharges with active control of plasma uniformity. Yasaka, Yasuyoshi; Koga, Kazuya; Ishii, Nobuo; Yamamoto, Tetsuya; Ando, Makoto; Takahashi, Masaharu // Physics of Plasmas;Mar2002, Vol. 9 Issue 3, p1029 

    Planar microwave discharges using a multi-slotted planar antenna are investigated. The enhancement of the microwave fields near the plasma resonance is observed in accordance with the theory of the resonant absorption. By operating the antenna with the azimuthally rotating fields, highly uniform...

  • Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam... Meger, R.A.; Mathew, J.; Gregor, J.A.; Pechacek, R.E.; Fernsler, R.F.; Manheimer, W.; Robson, A.E. // Physics of Plasmas;Jun95, Vol. 2 Issue 6, p2532 

    Investigates the formation of a plasma mirror for high-frequency microwave beam steering. Far-field antenna pattern of microwaves reflected off the plasma sheet; Stationary condition of the critical surface during the current pulse; Plasma density measurements and optical emissions.

  • Plasma buildup by short-pulse high-power microwaves. Bhattacharjee, Sudeep; Amemiya, Hiroshi; Yano, Yasushige // Journal of Applied Physics;4/1/2001, Vol. 89 Issue 7 

    The buildup of a plasma produced by short-pulse (0.05-1.2 μs), high-power (60-100 kW) microwaves is studied in a pressure range of 10 mTorr-10 Torr, by measurements of the temporal variation of the current and the optical intensity. The plasma is produced in a cylindrical tube and confined by...

  • High-repetition-rate operation of the wire ion plasma source using a novel method. Urai, Hajime; Kurosawa, Tadashi; Okino, Akitoshi; Hotta, Eiki; Yasui, Hiroyuki; Tamagawa, Toru // Review of Scientific Instruments;Sep97, Vol. 68 Issue 9, p3346 

    Proposes a method for the ignition of pulsed discharges on the wire ion plasma source (WIPS). Use of WIPS as a pulsed ion source for ion-induced secondary-emission electron guns; Pulsed discharges of the WIPS; Shortness of lifetime peculiar to gas filled switching devices.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics