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Automation of variable low energy positron beam experiments using LabVIEW based program

  • J. ParimalaEmail author
  • S. Abhaya
  • Renjith Ramachandran
  • R. Rajaraman
  • G. Amarendra
Article
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Abstract

Implementation of a state of the art data acquisition and analysis program for variable low energy positron beam using LabVIEW based automation software is described. The program does the following functions: (a) controlling the remote programmable high voltage–power supply to bias the sample negatively (i.e., to vary the positron beam energy), (b) control of Windows based PCI MCA card, (c) calculating the S, W, R and ortho-positronium self-annihilation fraction (fPs) parameters, errors, and other relevant parameters, (d) saving the raw spectra, results and log data file and (e) dynamic display of raw spectrum and S, W, fPs versus energy for easy visualization of progress of the experiment. The USB based interfacing standard of this design provides easy connectivity to the personal computers.

Keywords

Positron beams LabVIEW automation Programmable system on chip (PSoC) Multi channel analyzer (MCA) 

Notes

References

  1. 1.
    Schultz PJ, Lynn KG (1988) Interaction of positron beams with surfaces, thin films, and interfaces. Rev. Mod. Phys. 60:701CrossRefGoogle Scholar
  2. 2.
    Krause-Rehberg R, Leipner HS (1998) Positron annihilation in semiconductors. Springer, BerlinGoogle Scholar
  3. 3.
    Amarendra G, Viswanathan B, Venugopal Rao G, Parimala J, Purniah B (1997) Depth resolved positron beams for depth resolved defect spectroscopy in thin film structures. Curr Sci 73:409–417Google Scholar
  4. 4.
  5. 5.
  6. 6.
    Petkov Mihail P, Weber Marc H, Lynn Kelvin G, Rodbell Kenneth P (2001) Porosity characterization by beam-based three-photon positron annihilation spectroscopy. Appl Phys Lett 79:3884–3886CrossRefGoogle Scholar
  7. 7.
    Mills Allen P Jr. (1978) Positronium formation at surfaces. Phys Rev Lett 41:1828–1831CrossRefGoogle Scholar
  8. 8.
    Application Note: Digital-to-Analog Conversion Using PWM in Z8 Encore! XP® Microcontrollers AN015004-1207Google Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • J. Parimala
    • 1
    Email author
  • S. Abhaya
    • 1
    • 2
  • Renjith Ramachandran
    • 1
    • 2
  • R. Rajaraman
    • 1
    • 2
  • G. Amarendra
    • 1
    • 2
  1. 1.Materials Science GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia
  2. 2.HBNIKalpakkamIndia

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