000119321 001__ 119321
000119321 005__ 20190228220114.0
000119321 0247_ $$2doi$$a10.1063/1.859825
000119321 022__ $$a0899-8221
000119321 02470 $$2ISI$$aA1991FN76500001
000119321 037__ $$aARTICLE
000119321 245__ $$aVelocity Ratio Measurement Using the Frequency of the Gyro Backward-Wave
000119321 260__ $$c1991
000119321 269__ $$a1991
000119321 336__ $$aJournal Articles
000119321 520__ $$aThe operating diagram of a low quality factor, 8 GHz TE-degrees-01 gyrotron exhibits oscillations between 6.8 and 7.3 GHz. These oscillations are identified as the backward wave component of the TE-degrees-21 traveling mode. As the resonance condition of this mode depends on the average parallel velocity <upsilon-parallel-to> of the beam electrons (omega-BW approximately-or-equal-to OMEGA-c/gamma-k parallel-to <upsilon-parallel-to>), the measurement of omega-BW for given OMEGA-c and gamma is used as a diagnostic for the beam electrons velocity ratio alpha = <upsilon-perpendicular-to>/<upsilon-parallel-to>. The values of alpha, deduced from omega-BW through the linear dispersion relation for the electron cyclotron instability in an infinite waveguide, are unrealistic. A nonlinear simulation code gives alpha values that are in very good agreement with the ones predicted by a particle trajectory code (+ 10% to + 20%). It is found numerically that the particles' velocity dispersion in upsilon-perpendicular-to and upsilon-parallel-to increases omega-BW. This effect explains part of the discrepancy between the values of alpha inferred from omega-BW without velocity dispersion and the expected values.
000119321 700__ $$aMuggli, P.
000119321 700__ $$0241171$$g106568$$aTran, M. Q.
000119321 700__ $$aTran, T. M.$$g106569$$0240103
000119321 773__ $$j3$$tPhysics of Fluids B-Plasma Physics$$k6$$q1315-1318
000119321 909CO $$pSB$$particle$$ooai:infoscience.tind.io:119321
000119321 909C0 $$pCRPP
000119321 909C0 $$0252028$$pSPC$$xU12272$$xU12268$$xU10558$$xU10635$$xU12266$$xU10636$$xU10137$$xU12270$$xU10557$$xU12273$$xU10559$$xU12271$$xU12269$$xU12267$$xU10136
000119321 937__ $$aCRPP-ARTICLE-1991-012
000119321 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000119321 980__ $$aARTICLE