Chin. Phys. Lett.  2013, Vol. 30 Issue (1): 015202    DOI: 10.1088/0256-307X/30/1/015202
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
Influence of Discharge Voltage on Charged Particles in a Multi-Dipole Device in the Presence of an Ion Collecting Surface
M. K. Mishra1*, A. Phukan2, M. Chakraborty3
1Department of Physics, Baosi Banikanta Kakati College, Nagaon, Barpeta, Assam-781311, India
2Department of Physics, Madhabdev College, Narayanpur, Lakhimpur, Assam-784164, India
3Centre of Plasma Physics-Institute for Plasma Research, Tepesia, Sonapur, Assam-782402, India
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M. K. Mishra, A. Phukan, M. Chakraborty 2013 Chin. Phys. Lett. 30 015202
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Abstract The influence of discharge voltage on ion collecting surfaces in the form of a metal plate and a mesh grid is investigated in a multi-dipole device. In the experiment, a solid metal plate and a mesh grid are placed alternately at one end of the multi-dipole device. It is seen that except for high negative bias, the ion space charge layer in front of the grid gets depleted with the increase in discharge voltage whereas it gets thickened in front of the plate. It is also observed that the electron loss at the cusp (anode current) changes accordingly in both the cases. The increase in discharge voltage can enhance the Bohm speed of ions towards the ion collecting surfaces. Further, the negative potential applied to the ion collecting surfaces lowers the bulk plasma potential, which in turn affects the anode current.
Received: 11 September 2012      Published: 04 March 2013
PACS:  52.25.Jm (Ionization of plasmas)  
  52.80.-s (Electric discharges)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/1/015202       OR      https://cpl.iphy.ac.cn/Y2013/V30/I1/015202
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M. K. Mishra
A. Phukan
M. Chakraborty
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