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Book Ion Heating in ATC Tokamak in the Ion Cyclotron Range of Frequencies

Download or read book Ion Heating in ATC Tokamak in the Ion Cyclotron Range of Frequencies written by Hironori Takahashi and published by . This book was released on 1977 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Ion Cyclotron Range of Frequencies Mode Conversion Electron Heating in Deuterium hydrogen Plasmas in the Alcator C Mod Tokamak

Download or read book Ion Cyclotron Range of Frequencies Mode Conversion Electron Heating in Deuterium hydrogen Plasmas in the Alcator C Mod Tokamak written by Yijun Lin and published by . This book was released on 2003 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Localized direct electron heating by mode-converted ion cyclotron range of frequencies (ICRF) waves in D(H) tokamak plasmas has been clearly observed for the first time in Alcator C-Mod. Both on- and off-axis (high field side) mode conversion electron heating (MCEH) have been observed. The MCEH profile was obtained from a break in slope analysis of electron temperature signals in the presence of rf (radio frequency) shut-off. The temperature was measured by a 32-channel high spatial resolution (7 mm) 2nd harmonic heterodyne electron cyclotron emission (ECE) system. The experimental profiles were compared with the predictions from a toroidal full-wave ICRF code TORIC. Using the hydrogen concentration measured by a high-resolution optical spectrometer, TORIC predictions were shown qualitatively in agreement with the experimental results for both on- and off-axis MC cases. From the simulations, the electron heating from mode converted ion cyclotron wave (ICW) and ion Bernstein wave (IBW) is examined.

Book Development and Experimental Evaluation of Theoretical Models for Ion Cyclotron Resonance Frequency Heating of Tokamak Plasmas

Download or read book Development and Experimental Evaluation of Theoretical Models for Ion Cyclotron Resonance Frequency Heating of Tokamak Plasmas written by Mervi Mantsinen and published by . This book was released on 1999 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Finite geometry analysis of the coupling of fast waves in the ion cyclotron range of frequency to the tokamak de varennes plasma

Download or read book Finite geometry analysis of the coupling of fast waves in the ion cyclotron range of frequency to the tokamak de varennes plasma written by M. Shoucri and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zircaloy-4 fuel sheath specimens 15.2 mm diameter by 0.42 mm wall thickness with beryllium-brazed appendages have been laboratory tested at high temperature with internal gas pressurization and inert gas shielding of the outer surfaces. with sufficient hoop stress at temperatures less than 1073 k cracks, which were due to a beryllium assisted crack penetration mechanism, were found to occur at the appendages. formulae to predict the beryllium penetration and rupture have been derived by westinghouse canada ltd. based on data from direct resistance-heated specimens. the formulae are thought to be able to predict the phenomenon in fuel sheaths with changing temperature/pressure histories. a series of tests was done by canadian general electric to determine the formulae ability to predict the occurrence of beryllium assisted crack penetration in specimens heated indirectly with internal heaters. the tests showed: 1) there is an incubation period before any beryllium assisted crack penetration occurs. 2) at sheath temperatures below approximately equal to 1073 k sheath rupture by excessive mechanical strain will preclude rupture by beryllium assisted crack penetration. 3) the formulae predicted rupture times above and below the braze alloy melting temperature within the previously determined confidence limits. 4) predictions of beryllium assisted crack penetration rupture for specimens with changing temperature/pressure histories were of similar accuracy to predictions of isothermal tests. 5) specimens with an appendage plane of one bearing pad and three spacer pads behaved similarly to the specimens with four spacer pads on which the formulae were based.

Book Ion Cyclotron Frequency Range Coupling and Heating in Large Tokamaks

Download or read book Ion Cyclotron Frequency Range Coupling and Heating in Large Tokamaks written by H. Romero and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Wave Generation and Heating Near Ion Cyclotron Frequency in the ST Tokamak

Download or read book Wave Generation and Heating Near Ion Cyclotron Frequency in the ST Tokamak written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of the recent, high power ICRH experiments performed on the ST Tokamak are reported. It was demonstrated that both the fast and slow waves could be generated in toroidal geometry, and heating of the plasma ions at power levels up to 1 MW was observed both at the ion cyclotron frequency ($omega$/sub ci/) and its second harmonic (2$omega$/sub ci/). Measurements by a charge exchange neutral detector directed tangentially to the plasma torus revealed that at 2$omega$/sub ci/ the ion energy within the bulk of the ion distribution function (''parallel body temperature'') could be increased from about 100 eV up to 200 eV with efficiencies ranging from 8 to 45 percent. Efficiency at $omega$/ sub ci/ in raising the parallel temperature was less than at 2$omega$/sub ci/. Charge exchange neutral detection perpendicular to the plasma column showed that both at $omega$/sub ci/ and 2$omega$/sub ci/ the ''perpendicular body temperature'' was enhanced very rapidly by a factor of up to 3. Also, buildup of a high energy ''tail'' in the ion energy distribution was observed. Power transfer to the ions seemed extremely efficient. (auth).

Book Majority Ion Heating Near the Ion ion Hybrid Layer in Tokamaks

Download or read book Majority Ion Heating Near the Ion ion Hybrid Layer in Tokamaks written by C. K. Phillips and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book ICRF Heating in Large Tokamaks

Download or read book ICRF Heating in Large Tokamaks written by J. Hosea and published by . This book was released on 1976 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: