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Pramana

, Volume 10, Issue 3, pp 289–302 | Cite as

An on-line TDC-312 computer-controlled neutron diffractometer

  • A Sequeira
  • S N Momin
  • H Rajagopal
  • J N Soni
  • R Chidambaram
  • Dilip Kumar
  • A Ramana Rao
  • V M Gopu
Experimental Techniques And Instrumentation
  • 23 Downloads

Abstract

The design and fabrication of an indigenous on-line computer controlled four-circle neutron diffractometer at the CIRUS reactor in Trombay are described. The diffractometer has an 18 in dia full-circle crystal-orienter which is sturdy enough to carry a cryostat. Three crystal orientation angles χ, φ and ω and the detector angle 2θ can be set to an accuracy of 0·01°. The four angle shafts are driven through precision worm-gears by SCR-controlled DC motors and their instantaneous positions sensed by optical digitizers. The diffractometer is interfaced to an ECIL TDC-312 computer system consisting of the CPU with 4K-memory, ASR-35 teletype, X-Y plotter and the digital input/output system (DIOS). The DIOS which operates under program control is a real-time peripheral device used to exchange information in digital form between the computer and the diffractometer. A software package consisting of over 40 useroriented teletype commands has been developed for on-line control and automatic data-acquisition.

Keywords

Computer controlled diffractometer four-circle neutron diffractometer diffractometer control software 

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References

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Copyright information

© the Indian Academy of Sciences 1977

Authors and Affiliations

  • A Sequeira
    • 1
  • S N Momin
    • 1
  • H Rajagopal
    • 1
  • J N Soni
    • 1
  • R Chidambaram
    • 1
  • Dilip Kumar
    • 1
    • 2
  • A Ramana Rao
    • 1
    • 2
  • V M Gopu
    • 1
    • 2
  1. 1.Neutron Physics SectionBhabha Atomic Research CentreBombay
  2. 2.Computer GroupElectronics Corporation of India LimitedHyderabad

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