Spectroscopic interpretation and velocimetry analysis of fluctuations in a cylindrical plasma recorded by a fast camera

Oldenbürger, S.; Brandt, C.; Brochard, F.; Lemoine, N.; Bonhomme, G.
June 2010
Review of Scientific Instruments;Jun2010, Vol. 81 Issue 6, p063505
Academic Journal
Fast visible imaging is used on a cylindrical magnetized argon plasma produced by thermionic discharge in the Mirabelle device. To link the information collected with the camera to a physical quantity, fast camera movies of plasma structures are compared to Langmuir probe measurements. High correlation is found between light fluctuations and plasma density fluctuations. Contributions from neutral argon and ionized argon to the overall light intensity are separated by using interference filters and a light intensifier. Light emitting transitions are shown to involve a metastable neutral argon state that can be excited by thermal plasma electrons, thus explaining the good correlation between light and density fluctuations. The propagation velocity of plasma structures is calculated by adapting velocimetry methods to the fast camera movies. The resulting estimates of instantaneous propagation velocity are in agreement with former experiments. The computation of mean velocities is discussed.


Related Articles

  • Langmuir probe data analysis for a magnetized inductive radio-frequency discharge. Popescu, S.; Ohtsu, Y.; Fujita, H. // Journal of Applied Physics;Nov2007, Vol. 102 Issue 9, p093302 

    The properties of an inductively coupled argon plasma in a uniform magnetic field, at pressures of the order of 0.1 Pa, in the presence of a weak current-free electric double layer, are measured with a plane Langmuir probe. The static current-voltage probe characteristics, recorded on the...

  • High-speed dual Langmuir probe. Lobbia, Robert B.; Gallimore, Alec D. // Review of Scientific Instruments;Jul2010, Vol. 81 Issue 7, p073503 

    In an effort to temporally resolve the electron density, electron temperature, and plasma potential for turbulent plasma discharges, a unique high-speed dual Langmuir probe (HDLP) has been developed. A traditional single Langmuir probe of cylindrical geometry (exposed to the plasma) is swept...

  • Time-resolved measurement of plasma parameters by means of triple probe. Qayyum, A.; Ahmad, N.; Ahmad, S.; Deeba, Farah; Ali, Rafaqat; Hussain, S. // Review of Scientific Instruments;Dec2013, Vol. 84 Issue 12, p123502 

    Triple Langmuir probe (TLP) diagnostic system with its necessary driving circuit is developed and successfully applies for time-resolved measurement of plasma parameters in the negative glow region of pulsating-dc discharge. This technique allows the instantaneous measurement of electron...

  • Construction of a versatile negative ion source and related developments. Cavenago, M.; Serianni, G.; Kulevoy, T.; Petrenko, S.; Agostinetti, P.; Antoni, V.; Bigi, M.; Conventi, D.; Fellin, F.; Minarello, A.; De Muri, M.; Pasqualotto, R.; Recchia, M.; Rigato, M.; Sattin, M.; Barbisan, M.; Rossetto, F.; Valente, M.; Veltri, P. // AIP Conference Proceedings;Feb2013, Vol. 1515 Issue 1, p157 

    The NIO1 project consisting of a 60 kV ion source (9 beamlets of 15 mA each of H-) is jointly developed by Consorzio RFX and INFN-LNL, with the purpose of providing a test ion source, capable of working in continuous mode and in condition similar to larger ion sources for Neutral Beam Injectors....

  • Measurement of effective sheath width around cutoff probe in low-pressure plasmas. Kim, D. W.; You, S. J.; Kim, J. H.; Chang, H. Y.; Oh, W. Y. // Physics of Plasmas;May2014, Vol. 21 Issue 5, p053504-1 

    Previous studies indicated that the measurement results of microwave probes can be improved by applying the adequate sheath width to their measurement models, and consequently the sheath width around the microwave probe tips has become very important information for microwave probe diagnostics....

  • Characteristics of geodesic acoustic mode zonal flow and ambient turbulence at the edge of the HL-2A tokamak plasmas. Zhao, K. J.; Dong, J. Q.; Yan, L. W.; Hong, W. Y.; Lan, T.; Liu, A. D.; Qian, J.; Cheng, J.; Yu, D. L.; Huang, Y.; He, H. D.; Liu, Yi.; Yang, Q. W.; Duan, X. R.; Song, X. M.; Ding, X. T.; Liu, Y. // Physics of Plasmas;Dec2007, Vol. 14 Issue 12, p122301 

    The three-dimensional characteristics of the geodesic acoustic mode zonal flows (GAMZFs) and the ambient turbulence (AT) at the edge of the HuanLiuqi-2A tokamak [Y. Liu et al., Nucl. Fusion 45, S203 (2005)] are investigated with Langmuir probe arrays and the results are presented in detail. The...

  • Means to remove electrode contamination effect of Langmuir probe measurement in space. Oyama, K.-I.; Lee, C. H.; Fang, H. K.; Cheng, C. Z. // Review of Scientific Instruments;May2012, Vol. 83 Issue 5, p055113 

    Precaution to remove the serious effect of electrode contamination in Langmuir probe experiments has not been taken in many space measurements because the effect is either not understood or ignored. We stress here that one should pay extra attention to the electrode contamination effect to get...

  • Experimental study of the ion current to a cylindrical Langmuir probe taking into account a finite ion temperature. Díaz-Cabrera, J. M.; Lucena-Polonio, M. V.; Fernández Palop, J. I.; Morales Crespo, R.; Hernández, M. A.; Tejero-del-Caz, A.; Ballesteros, J. // Journal of Applied Physics;Mar2012, Vol. 111 Issue 6, p063303 

    This article deals with the experimental verification of a theoretical radial model, developed by the authors, for the sheath that surrounds a cylindrical Langmuir probe immersed in a plasma in which the positive ion temperature, Ti, is not negligibly small compared to the electron temperature,...

  • Effect of helium on spatial plasma parameters in low pressure argon-helium plasma. Bang, Jin-Young; Han, Duksun; Cho, Sung-Won; Chung, Chin-Wook // Applied Physics Letters;4/16/2012, Vol. 100 Issue 16, p164107 

    Spatial distributions of the electron energy probability function were measured using a Langmuir probe in side-type argon-helium inductively coupled plasma. Collisional dominated electron heating and a concave shape of plasma density profile were observed at 10 mTorr pure argon. As the helium...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics