BIOMAT Database Logo BIOMAT Database Logo

Registration of Alfvén resonances in TCABR tokamak by the scanning reflectometer at sideband frequencies. 2011

L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Instituto de Física, Universidade de São Paulo, São Paulo, Brazil. lruchko@if.usp.br

A frequency scanning O-mode reflectometer was used for studies of plasma density oscillations during local Alfvén wave (LAW) excitation in the Tokamak Chauffage Alfvén Brésilien (TCABR) at the frequency f(A) = 5 MHz. It was found that the spectrum of the reflectometer output signal, which consists mainly of the "beat" frequency f(B), is modified by the LAW excitation, and two additional frequency peaks appear, which are symmetrical in relation to the LAW excitation frequency f = f(A) ± f(B). This result opens the possibility to improve the efficiency of studying the LAW induced density oscillations. The symmetry of these frequency peaks yields the possibility of finding the microwave frequency at which the reflectometer cutoff layer coincides with radial position of the LAW resonance zone in the TCABR tokamak.

UI MeSH Term Description Entries

Related Publications

L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Development of frequency modulation reflectometer for Korea Superconducting Tokamak Advanced Research tokamak.
August 2013, The Review of scientific instruments,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Monitoring Alfvén cascades with interferometry on the JET Tokamak.
October 2004, Physical review letters,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
β-induced Alfvén eigenmodes destabilized by energetic electrons in a Tokamak plasma.
October 2010, Physical review letters,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Microwave Doppler reflectometer system in the Experimental Advanced Superconducting Tokamak.
October 2013, The Review of scientific instruments,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Observation of beta-induced Alfvén eigenmodes in the DIII-D tokamak.
August 1993, Physical review letters,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Mitigation of Alfvén activity in a tokamak by externally applied static 3D fields.
June 2013, Physical review letters,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Vibrational resonances in biological systems at microwave frequencies.
March 2002, Biophysical journal,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Measurements of the tokamak-safety-factor profile by means of driven resonant Alfvén waves.
January 1989, Physical review letters,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
V-band nanosecond-scale pulse reflectometer diagnostic in the TCV tokamak.
December 2019, The Review of scientific instruments,
L F Ruchko, and A G Elfimov, and C M Teixeira, and J I Elizondo, and E Sanada, and R M O Galvão, and M E Manso, and A Silva
Coupling of Neutral-Beam-Driven Compressional Alfvén Eigenmodes to Kinetic Alfvén Waves in NSTX Tokamak and Energy Channeling.
July 2015, Physical review letters,
Copied contents to your clipboard!