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This paper investigates the suitability of laser thermal desorption (LTD) from titanium hydride targets for the production of short, intense hydrogen gas pulses for diagnostic applications in fusion devices. A hydrogen yield of 2.2 x 1.0 E18 H(2) molecules was achieved with a pulse energy of 11 J on a target spot diameter of 4.5 mm. The duration of the gas puff is closely coupled to the laser pulse length of 1 ms. The production of gas pulses by LTD close to the plasma creates the requirements for investigating very fast transport processes, especially at the high-field side. The hydrogen pulses were contaminated by 2 x 1.0 E-3 Ti atoms/H(2) molecule, primarily as a result of evaporation on overheated surface inhomogeneities. Conditioning the surface with giant laser pulses allowed the contamination to be reduced by a factor of 2.

Additional information

Authors: FISCHER R, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);STEUER K-H, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);NOLTE R, Physikalisch-Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 65 (1994) No. 7, pp. 2306-2309
Record Number: 199411052 / Last updated on: 1994-11-28
Original language: en
Available languages: en