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Bipolar charging of dust particles under ultraviolet radiation |
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| Authors: | A. V. Filippov V. N. Babichev V. E. Fortov A. V. Gavrikov A. F. Pal’ O. F. Petrov A. N. Starostin N. E. Sarkarov |
| Affiliation: | 1.State Research Center of the Russian Federation,Troitsk Institute for Innovation and Fusion Research,Troisk, Moscow oblast,Russia;2.Joint Institute for High Temperatures,Russian Academy of Sciences,Moscow,Russia;3.Moscow Institute of Physics and Technology (State University),Dolgoprudnyi, Moscow oblast,Russia |
| Abstract: | The photoemission charging of dust particles under ultraviolet radiation from a xenon lamp has been investigated. The velocities of yttrium dust particles with a work function of 3.3 eV and their charges have been determined experimentally; the latter are about 400–500 and about 100 elementary charges per micron of radius for the positively and negatively charged fractions, respectively. The dust particle charging and the dust cloud evolution in a photoemission cell after exposure to an ultraviolet radiation source under the applied voltage have been simulated numerically. The photoemission charging of dust particles has been calculated on the basis of nonlocal and local charging models. Only unipolar particle charging is shown to take place in a system of polydisperse dust particles with the same photoemission efficiency. It has been established that bipolar charging is possible in the case of monodisperse particles with different quantum efficiencies. Polydispersity in this case facilitates the appearance of oppositely charged particles in a photoemission plasma. |
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