Effect of Wall Conditioning on Neutral Gas Transport
in the Gas-Dynamic Confinement System¹

P. A. Bagryanskii*, E. D. Bender*, A. A. Ivanov*, A. N. Karpushov*, S. V. Murakhtin*,
K. Noack**, S. Krahl**, and S. Collatz**

* Budker Institute of Nuclear Physics, Novosibirsk, 630090 Russia
** Research Center Rossendorf, P.O. Box 510119, D-01314 Dresden, Germany

Received May 27, 1997

Abstract—The effect of titanium conditioning of the chamber wall on the plasma confinement in a gas-
dynamic confinement system is studied. After depositing titanium on the inner surface of the vacuum chamber,
the charge-exchange loss of fast ions turns out to be substantially smaller than when there was no wall condi-
tioning. For typical discharge conditions, the temporal and spatial variations in the neutral gas density are mea-
sured experimentally and calculated by using the Monte Carlo transport code. A comparison of the numerical
results with the experimental data shows that the recycling coefficient of the chamber wall coated with titanium
is close to unity.

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