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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Babaeva, N.Yu. Kushner, M.J. Arakoni, R.A. |
| Copyright Year | 2006 |
| Description | Author affiliation: Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA (Babaeva, N.Yu.; Kushner, M.J.) |
| Abstract | Summary form only given. Chemical oxygen-iodine lasers (COILs) achieve oscillation on the $^{2}P_{1/2}rarr^{2}P_{3/2}$ transition of atomic iodine at 1.315 mum by a series of excitation transfers from $O_{2}(^{1}Delta).$ In conventional COILs, $O_{2}(1Delta)$ is produced by liquid phase chemistry. In electrically excited COILs, (eCOILs) the $O_{2}(^{1}Delta)$ is produced in a flowing plasma, typically $He/O_{2},$ at a few to 10s torr. One method to improve the efficiency of producing $O_{2}(^{1}Delta)$ in eCOILS is by lowering the average value of electron temperature, $T_{e},$ using spiker-sustainer (S-S) excitation. In the S-S technique a high power pulse (spiker) is followed by a lower power period (sustainer). Excess ionization produced by the spiker enables the sustainer to operate with a lower $T_{e}.$ Previous investigations have suggested that S-S techniques can significantly raise yields of O2 $}(^{1}Delta).$ In this paper, we report on results from a 2-dimensional computational investigation of radio frequency excited flowing $He/O_{2}$ plasmas with emphasis on optimization of the S-S method. The model is a 2-dimensional plasma hydrodynamics simulation encompassing a solution of Navier Stokes equations for neutral flow dynamics. We found that the efficiency of S-S excitation, as measured by the yield of $O_{2}(^{1}Delta),$ depends on a variety of parameters. These parameters include the details of the pulse shape, the carrier frequency, duty cycle (fraction of the S-S cycle for the spiker), S-S frequency (time between spiker pulses), spiker pulse shape and the ratio of spiker to sustainer voltage as well as on pressure. For a given $T_{e},$ the yield of $O_{2}(^{1}Delta)$ largely depends on the energy deposition per $O_{2}$ molecule. As a consequence, the yield depends somewhat linearly on $O_{2}$ mole fraction while the total $O_{2}(^{1}Delta)$ production is less sensitive to $O_{2}$ mole fraction |
| Sponsorship | Plasma Sci. and Applications Comm. IEEE Nuclear and Plasma Sci. Soc |
| Starting Page | 4 |
| Ending Page | 4 |
| File Size | 207404 |
| Page Count | 1 |
| File Format | |
| ISBN | 1424401259 |
| DOI | 10.1109/PLASMA.2006.1706876 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-06-04 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Chemical lasers Optical pulses Radio frequency Plasma chemistry Coils Plasma measurements Plasma simulation Pulse shaping methods Laser transitions Plasma temperature |
| Content Type | Text |
| Resource Type | Article |
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