TITLE

Development of two-grating spectrometer for the charge exchange spectroscopy system on KSTAR

AUTHOR(S)
Lee, Hyungho; Song, Eun-ji; Park, Young-dong; Oh, Soo-ghee; Ko, Won-Ha
PUB. DATE
June 2011
SOURCE
Review of Scientific Instruments;Jun2011, Vol. 82 Issue 6, p063510
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The charge exchange spectroscopy (CES) system on Korea Superconducting Tokamak Advanced Research (KSTAR) was installed last year and had been applied to measure the C VI ion temperature and rotation velocity profiles. The ion temperature and rotation velocity profiles had been estimated from the C VI 5290.5 Ã… (n = 8-7) charge-exchange spectrum signal measured by a Czerny-Turner type spectrometer and a thinned back-illuminated charge coupled device (CCD) camera. However, the Czerny-Turner type spectrometer used for the KSTAR CES system showed so low signal to noise ratio for KSTAR plasmas in the 2010 experimental campaign that the time resolution of the CES system had been limited to 100 ms due to the increased exposure time of the attached CCD camera. Then, new two-grating spectrometer had been developed in order to improve the time resolution of the CES system. The spectrometer consists of two gratings (1200 g/mm and 1800 g/mm each) with additive configuration, concave mirrors (f = 50 cm), and a cylindrical lens (f = 50 cm). The time resolution of the CES system increases by a factor of 2-4 with the two-grating spectrometer. The C VI ion temperature and rotation velocity profiles obtained by the two-grating spectrometer are compared to those by Czerny-Turner type spectrometer in this paper.
ACCESSION #
62010811

 

Related Articles

  • Masking a CCD camera allows multichord charge exchange spectroscopy measurements at high speed on the DIII-D tokamak. Meyer, O.; Burrell, K. H.; Chavez, J. A.; Kaplan, D. H.; Chrystal, C.; Pablant, N. A.; Solomon, W. M. // Review of Scientific Instruments;Feb2011, Vol. 82 Issue 2, p023114 

    Charge exchange spectroscopy is one of the standard plasma diagnostic techniques used in tokamak research to determine ion temperature, rotation speed, particle density, and radial electric field. Configuring a charge coupled device (CCD) camera to serve as a detector in such a system requires a...

  • Vacuum ultraviolet impurity spectroscopy on the Alcator C-Mod tokamak. Reinke, M. L.; Beiersdorfer, P.; Howard, N. T.; Magee, E. W.; Podpaly, Y.; Rice, J. E.; Terry, J. L. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D736 

    Vacuum ultraviolet spectroscopy is used on the Alcator C-Mod tokamak to study the physics of impurity transport and provide feedback on impurity levels to assist experimental operations. Sputtering from C-Mod's all metal (Mo+W) plasma facing components and ion cyclotron range of frequency...

  • Pulsed Regime of Hollow‐Cathode Lamps for Spectral Analytical Measurements. Kureichik, K.P.; Mavlyutov, M.M.; Kharitonchik, V.I.; Ibragim, A.Z. // Journal of Applied Spectroscopy;Jul/Aug2004, Vol. 71 Issue 4, p600 

    We have developed methods of investigation of gas‐discharge sources for spectral measurements, in particular, hollow‐cathode lamps (HCL) operating in a pulsed regime of excitation. The operating conditions of the HCL have been analyzed and the parameters of the pulsed regime have...

  • Finding SDSS BALQSOs Using Non-Negative Matrix Factorisation. Allen, James T.; Hewett, Paul C.; Belokurov, Vasily; Wild, Vivienne // AIP Conference Proceedings;12/15/2008, Vol. 1082 Issue 1, p85 

    Modern spectroscopic databases provide a wealth of information about the physical processes and environments associated with astrophysical populations. Techniques such as blind source separation (BSS), in which sets of spectra are decomposed into a number of components, offer the prospect of...

  • An Approach for Characterizing and Comparing Hyperspectral Microscopy Systems. Annamdevula, Naga S.; Sweat, Brenner; Favreau, Peter; Lindsey, Ashley S.; Alvarez, Diego F.; Rich, Thomas C.; Leavesley, Silas J. // Sensors (14248220);Jul2013, Vol. 13 Issue 7, p9267 

    Hyperspectral imaging and analysis approaches offer accurate detection and quantification of fluorescently-labeled proteins and cells in highly autofluorescent tissues. However, selecting optimum acquisition settings for hyperspectral imaging is often a daunting task. In this study, we compared...

  • Signal-to-noise ratio. Hallas, Tony // Astronomy;Oct2010, Vol. 38 Issue 10, p68 

    The article discusses astronomical photography and the signal-to-noise ratio in image processing, which is the ratio between wanted and unwanted data in an image. An overview of two places where noise is generated, including an individual's charge-coupled device (CCD) camera and the computer, is...

  • Application of beam emission spectroscopy to NBI plasmas of Heliotron J. Kobayashi, S.; Kado, S.; Oishi, T.; Kagawa, T.; Ohshima, S.; Mizuuchi, T.; Nagasaki, K.; Yamamoto, S.; Okada, H.; Minami, T.; Murakami, S.; Lee, H. Y.; Nakamura, Y.; Hanatani, K.; Konoshima, S.; Takeuchi, M.; Toushi, K.; Sano, F. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D726 

    This paper describes the application of the beam emission spectroscopy (BES) to Heliotron J, having the nonsymmetrical helical-magnetic-axis configuration. The spectral and spatial profile of the beam emission has been estimated by the numerical calculation taking the collisional excitation...

  • Experimental Comparison of the High-Speed Imaging Performance of an EM-CCD and sCMOS Camera in a Dynamic Live-Cell Imaging Test Case. Beier, Hope T.; Ibey, Bennett L. // PLoS ONE;Jan2014, Vol. 9 Issue 1, p1 

    The study of living cells may require advanced imaging techniques to track weak and rapidly changing signals. Fundamental to this need is the recent advancement in camera technology. Two camera types, specifically sCMOS and EM-CCD, promise both high signal-to-noise and high speed (>100 fps),...

  • Versatile spectrally shapeable multi-mode terahertz system. Scheller, M.; Stecher, M.; Gerhard, M.; Koch, M. // Applied Physics B: Lasers & Optics;Jan2012, Vol. 106 Issue 1, p81 

    We present a multimode continuous wave terahertz spectrometer driven by a compact laser diode with a tunable spectrum. An external feedback based on two optical gratings into the diode allows us to shape the laser emission spectrum, and hence the temporal shape of the terahertz signals. In...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics