Abstract Submittal Form
نویسندگان
چکیده
Local Alfvén wave (LAW) resonances are excited in tokamak plasmas by an externally driven electromagnetic field, with low frequency ωA =cAk|| <<ωci, where cA is the Alfvén velocity. Recently, wave driven density fluctuations at the LAW resonance m=± 1, N=±2 with few kW power deposition and 4 MHz frequency were detected in TCABR (Bt =1.1T, q0 =1.1, n0=1.4-2.0⋅10 m) using a fixed frequency (32.4GHz) O-mode reflectometer. Here, we show that combination of small power deposition in LAW resonances, swept by plasma density variation or scanned with generator frequencies, in combination with detection of the density fluctuations in the LAW resonances by reflectometry can serve as diagnostic tool for identification of the effective ion mass number Aef and q-profile in tokamaks. The idea is based on the simultaneous detection of the position of m=± 1 local AW resonances, which are excited by M/N=±1/±2 antenna modes, and m=0 generated by poloidal mode coupling effect in tokamaks. According to LAW dispersion, the m=0 resonance depends only on the effective ion mass number and does not depend on the q-profile. Then, using these data we can define qvalue at the position of m=± 1 L AW resonances. Using TAE coils with even toroidal modes (N=2, 4,..) and AW generator in the frequency band 0.6-1 MHz, an application of this method to Joint European Torus (Bt=2.3T, q0 =1-1.3, n0=5-7⋅10 m) is demonstrated. The idea of strong resonant absorption of RF fields, which are excited at the local Alfvén wave (LAW) resonance in magnetically confined inhomogeneous plasmas, was based on a series of the theoretical works carried out at 70-80th (for example, [1-3]). LAW resonance excitation is defined by mode conversion of an externally driven RF field below the ioncyclotron frequency, ωci , into the kinetic or electrostatic Alfvén wave (shear AW) at the Alfvén resonance layer where the resonance density can be defined by the equation,
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تاریخ انتشار 2004