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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.33: Poster

Dienstag, 31. August 2021, 14:00–16:00, P

TALIF on H₂ Plasmas in Preparation of its Usage for Negative Ion Sources — •Frederik Merk, Christian Wimmer, Stefan Briefi, and Ursel Fantz — Max-Planck-Institut für Plasmaphysik, Garching, Germany

Two-photon absorption laser induced fluorescence (TALIF) offers the possibility to measure both the velocity distribution function and the density of ground state H atoms in H₂ plasmas. Here, the atoms are excited via the simultaneous absorption of two photons followed by the emission of fluorescence which is used for diagnostic purposes. In order to generate the necessary 205.08 nm photons, a pulsed, frequency tripled dye laser is employed. In addition to the complexity of such an instrument, the diagnostic as a whole needs to be characterized thoroughly and calibration is necessary. This was done at a planar ICP where a 600 W, 13.56 MHz RF generator is used to drive H₂ plasmas. Here, TALIF is supplemented by optical emission spectroscopy on the Balmer lines and the molecular Fulcher-α transition in order to determine basic plasma parameters. The measurement results of scanning gas pressure and RF power coupled to the plasma are presented in this contribution. They are used to gain insight into the particle reactions taking place in the plasma. In addition, the implementation of TALIF at the H⁻/D⁻ ion source BATMAN Upgrade is prepared from the knowledge that was gained at the ICP.