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Ovidiu S. Stoican

Interest and experience in the following areas:
plasma physics, electrodynamic traps, nuclear quadrupole resonance (NQR), instrumentation and applied electronics, software development

RESEARCH ACTIVITIES

Electrodynamic traps

Study of the electrodynamic traps as a tool used in environment protection, biology, material and solid state physics
Development of new electrodynamic trap geometries
Manipulation of the stored microparticles by using acoustic waves

Microparticles cloud confined along the longitudinal axis of the linear trap

Plasma sources operating at atmospheric pressure and interaction plasma-electromagnetic field

Development of the plasma sources operating at atmospheric pressure, for various practical applications (medicine, biology, environment protection and material processing)
Interaction plasma-microwave field
Application of the plasma antenna technology for rf switches

The head of the plasma jet generator operating at atmospheric pressure during operation

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SOME RESULTS

DC cold plasma jet generator operating at atmospheric pressure

The supply electrical circuit consists of two dc sources parallel connected, operating at different voltage range:

HV1 source with an output voltage of about -7 kV, used to initiate the electrical discharge
HV2 source with an output voltage of about -600 V, used to sustain the electrical discharge

Ignition voltage switching on/off is performed automatically by an electronic circuit which compares the discharge current with a threshold value. This approach improves the circuit supply reliability, energy efficiency and diminishes electromagnetic perturbations. A single unit contains both dc sources. The whole system can be controlled remotely by means of a PC. Electronic circuits comprise only common components, commercially available, allowing to be implemented as a product by an innovative start-up.

Block diagram of the plasma jet generator power supply

Power supply unit prototype - front panel

PUBLICATIONS (selection)

A. Journals

O. S. Stoican, Electrical Supply Circuit for a Cold Plasma Source at Atmospheric Pressure Based on a Voltage Multiplier, Polymers, 13, 2132 (2021)
D. B. Dreghici, B. Butoi, D. Predoi, S. L. Iconaru , O. Stoican, A. Groza, Chitosan-Hydroxyapatite Composite Layers Generated in Radio Frequency Magnetron Sputtering Discharge: From Plasma to Structural and Morphological Analysis of Layers, Polymers, 12, 3065 (2020)
O. S. Stoican, High voltage pulses circuit for generating a plasma plume at atmospheric pressure, Romanian Reports in Physics, Vol. 71, No. 1, article no. 406 (2019)
O. S. Stoican, Voltage Reversal in Series-connected Three 1.5V AAA Alkaline Batteries, Int. J. Electrochem. Sci., vol. 14, No. 1, pp. 897 - 904 (2019)
O. S. Stoican, Study on the axial distribution of the stored microparticles in an electrodynamic trap by using software image processing, Rom. Journ. Phys, vol. 61, Nos. 3-4, pp. 536-542 (2016)
O. S. Stoican, Experimental setup aimed to study the electrical impedance variations of a plasma column in a wide frequency range, Romanian Reports in Physics, vol. 66, no. 3, 746-753 (2014)
G. Visan, O. S. Stoican, An experimental setup for the study of the particles stored in an electrodynamic trap, Rom. Journ. Phys.,Vol. 58, Nos. 1-2, pp. 171-180 (2013)
O. S. Stoican, Studies on the Interaction Between an Acoustic Wave and Levitated Microparticles in Waves in Fluids and Solids, Ruben Pico Vila (Ed.), 2011, ISBN: 978-953-307-285-2, InTech
O.S. Stoican, An atmospheric pressure plasma source driven by a train of monopolar high voltage pulses superimposed to a dc voltage, European Physical Journal-Applied Physics, 55, 30801 (2011)
O. S. Stoican, Galvanic isolated voltage source using a single photodiode, Rev. Sci. Instrum. 81, 046102 (2010)
O. S. Stoican, Study of RF Perturbations Due to a Hollow-Cathode Discharge, Rom. Journ. Phys., Vol. 55, Nos. 7-8, pp. 800-805 (2010)
O. S. Stoican, Period shift of a discharge tube relaxation oscillator due to a weak microwave field, Japanese Journal of Applied Physics, 48, 070218 (2009)
O. S. Stoican, Frequency shift of a relaxation oscillator due to an external electrode, Rom. Journ. Phys., Vol. 54, Nos. 3-4, pp. 385-390 (2009)
O. S. Stoican, L. C. Dinca, G. Visan, S. Radan, Acoustic detection of the parametrical resonance effect for a one-component microplasma consisting of the charged microparticles stored in the electrodynamic trap, Journal of Optoelectronics and Advanced Materials, Vol. 10, No. 8, August 2008, pp. 1988 -1990 (2008)
O. S. Stoican, NQR detection setup, Rom. Journ. Phys., Vol. 51, Nos. 1-2, pp. 311-315 (2006)
V. Gheorghe, L. Giurgiu, O. S. Stoican, D. Cacicovschi, R. Molnar, B. Mihalcea, Ordered structures in a variable length a. c. trap, Acta Physica Polonica A, 93, 4, pp. 625-629 (1998)
V. Florescu, S. Patrascu, O. S. Stoican, Systematic study of 1s - ns and 1s - nd two photon transitions of hydrogenlike atoms, Phys. Rev. A, 36, 5, pp. 2155-2166 (1987)

B. Patents

Combined electric-laser system for electric discharge control, RO 133688 (B1) /19-12-2018
System for electric supply of plasma generators, RO 133686 (B1) /06-12-2018
Linear segmented quadrupole trap, RO 132951 (B1) /17-05-2018
System for maintaining solid particles in suspension state, RO 133067 (B1) /07-12-2017
Circuit for automatic control of a mixed-supply plasma generator operation, RO 132739 (B1) /12-01-2017
System for detecting ionizing radiation, in real time, with electromagnetic noise protection, RO 131900 (B1) /27-11-2015
System and method for testing the effect of pulsed and synchronized beams of laser accelerated particles, RO 130134 (B1) /28-08-2013
System for maintaining micro and nano particles in levitation state in containers and capilary tubes, RO 129406 (B1) /07-09-2012
Circuit for emitting and receiving radio frequency electromagnetic waves as pulses, RO 123436 (B1) /19-10-2007

Contact:
ostoican(at)gmail.com
info(at)telmecanica.ro

2025