Study of particle transport in the ergodic layer based on the Doppler-free spectroscopy

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We have developed the technique of absorption spectroscopy for a hydrogen atom line with diode laser aiming at determination of the ionization location of hydrogen atoms in fusion plasma. An ultra-high wavelength resolution that is never available with usual emission spectroscopy technique has been realized with a relatively simple measurement system. Furthermore, we have observed several interesting phenomena like unexpected large tail components and anomalous crossover signals that could be related to the momentum relaxation mechanism of particles in plasma.