PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Tungsten ion source under double-pulse laser ablation system |
Ahmed Asaad I Khalil1, Ashraf I Hafez2, Mahmoud E Elgohary3,4, Mohamed A Morsy5 |
1 Department of Laser Sciences and Interactions, National Institute of Laser Enhanced Sciences, Cairo University, Giza 12613, Egypt;
2 Central Laboratory of Ministry of Electricity, Cairo, Egypt;
3 Atomic Research Center, Atomic Energy Authority, Cairo 13759, Egypt;
4 Department of Nuclear Engineering, Jordan University of Science and Technology Irbid, Jordan;
5 Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia |
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Abstract New tungsten ion source is produced by using single and double-pulse laser ablation system. Combined collinear Nd:YAG laser beams (266+1064 nm) are optimized to focus on the sample in air. Optimization of the experimental parameters is achieved to enhance the signal-to-noise ratio of the emission spectra. The velocity distribution of the emitted plasma cloud is carefully measured. The influences of the potential difference between the bias electrodes, laser wavelength and intensity on the current signal are also studied. The results show that the increase in the tungsten ion velocity under the double-pulse lasers causes the output current signal to increase by about three folds. The electron density and temperature are calculated by using the Stark-broadened line profile of tungsten line and Boltzmann plot method of the upper energy levels, respectively. The signal intensity dependence of the tungsten ion angular distribution is also analyzed. The results indicate that the double-pulse laser ablation configuration is more potent technique for producing more metal ion source deposition, thin film formation, and activated plasma-facing component material.
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Received: 11 April 2017
Revised: 29 May 2017
Accepted manuscript online:
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PACS:
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52.25.Os
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(Emission, absorption, and scattering of electromagnetic radiation ?)
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52.25.Jm
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(Ionization of plasmas)
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29.25.Ni
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(Ion sources: positive and negative)
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42.55.Rz
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(Doped-insulator lasers and other solid state lasers)
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Corresponding Authors:
Ahmed Asaad I Khalil
E-mail: ahmedasaad68@yahoo.com,ahmedasaad@niles.edu.eg
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Cite this article:
Ahmed Asaad I Khalil, Ashraf I Hafez, Mahmoud E Elgohary, Mohamed A Morsy Tungsten ion source under double-pulse laser ablation system 2017 Chin. Phys. B 26 095201
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