Plasma frequency measurements for absolute plasma density by means of wave cutoff method

Jung-Hyung Kim; Dae-Jin Seong, Karl H.; Jong-Yeon Lim, Karl H.; Kwang-Hwa Chung, Karl H.
December 2003
Applied Physics Letters;12/8/2003, Vol. 83 Issue 23, p4725
Academic Journal
A method for precise measurements of absolute electron density in the plasma using plasma frequency is developed. A microwave perturbation of a frequency is introduced to plasma from a network analyzer and transmits in the plasma. The transmitting wave at a distance from a radiating antenna is monitored using a spectrum analyzer to scan the perturbing frequency. The transmitting wave rapidly decays by a cutoff at the plasma frequency, which gives the absolute electron density. The transmitting waves of some frequency including plasma frequency are characterized. The measured plasma frequency by this method is coincident with that obtained by the plasma oscillation method. © 2003 American Institute of Physics.


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