A novel diagnostic for time-resolved spectroscopic argon and lithium density measurements
نویسندگان
چکیده
A new diagnostic technique for determining neutral gas and metal vapor densities over a wide pressure range with high time resolution is described. A compact, current-stabilized hollow cathode/anode discharge is use to ionize the gas and/or trace impurity to be analyzed. We report proof-of-principle operation of the diagnostic in a well characterized argon discharge in the pressure range 6.7–265Pa. The intensity ratio of neutral and singly ionized argon lines (IAr I/IAr II) is shown to increase monotonically with the neutral argon density. In a second experiment, absolute neutral lithium vapor densities have been measured using this diagnostic. 2004 Elsevier B.V. All rights reserved. PACS: 52.50.D; 07.60.R; 52.70; 52.25.Y
منابع مشابه
Spectroscopic Measurements of Argon Plasma Formation by a High-Intensity Lithium Ion Beam
J. E. Bailey,1 H. K. Chung,2 A. L. Carlson,1 D. Cohen,2 D. J. Johnson,1 P. Lake,4 J. J. MacFarlane,2 P. Wang,2 and D. R. Welch3 1Sandia National Laboratories, Albuquerque, New Mexico 87185 2Fusion Technology Institute, University of Wisconsin, Madison, Wisconsin 53706 3Mission Research Corporation, Albuquerque, New Mexico 87106 4K-Tech Corporation, Albuquerque, New Mexico 87110 (Received 3 Augu...
متن کاملContinuous wave cavity ring down spectroscopy measurements of velocity distribution functions of argon ions in a helicon plasma.
We report continuous wave cavity ring down spectroscopy (CW-CRDS) measurements of ion velocity distribution functions (VDFs) in low pressure argon helicon plasma (magnetic field strength of 600 G, T(e) ≈ 4 eV and n ≈ 5 × 10(11) cm(-3)). Laser induced fluorescence (LIF) is routinely used to measure VDFs of argon ions, argon neutrals, helium neutrals, and xenon ions in helicon sources. Here, we d...
متن کاملMicrowave Diagnostic Results from the Gaseous Electronics Conference RF Reference Cell
Electron density measurements with even the simplest microwave interferometry techniques can range over three to four orders of magnitude, can be responsive on time scales as fast as 50 ns, and are simple to obtain and interpret. Three groups have published electron density data taken in the Gaseous Electronics Conference (GEC) reference reactor using microwave interferometry. The agreement in ...
متن کاملContinuous wave cavity ring-down spectroscopy for velocity distribution measurements in plasma.
We report the development of a continuous wave cavity ring-down spectroscopic (CW-CRDS) diagnostic for real-time, in situ measurement of velocity distribution functions of ions and neutral atoms in plasma. This apparatus is less complex than conventional CW-CRDS systems. We provide a detailed description of the CW-CRDS apparatus as well as measurements of argon ions and neutrals in a high-densi...
متن کاملExperimental investigation of ultraviolet laser induced plasma density and temperature evolution in air
We present measurements and analysis of laser induced plasma neutral densities and temperatures in dry air by focusing 200 mJ, 10 MW high power, 193 nm ultraviolet ArF argon fluoride laser radiation to a 30 m radius spot size. We examine these properties that result from multiphoton and collisional cascade processes for pressures ranging from 40 Torr to 5 atm. A laser shadowgraphy diagnostic te...
متن کامل