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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/010/03/0289-0302

    • Keywords

       

      Computer controlled diffractometer; four-circle neutron diffractometer; diffractometer control software

    • 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.

    • Author Affiliations

       

      A Sequeira1 S N Momin1 H Rajagopal1 J N Soni1 R Chidambaram1 Dilip Kumar1 2 A Ramana Rao1 2 V M Gopu1 2

      1. Neutron Physics Section, Bhabha Atomic Research Centre, Bombay - 400 085
      2. Computer Group, Electronics Corporation of India Limited, Hyderabad - 500 762
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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