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

  • Experimental Techniques And Instrumentation
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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.

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Authors and Affiliations

  1. Neutron Physics Section, Bhabha Atomic Research Centre, 400 085, Bombay

    A Sequeira, S N Momin, H Rajagopal, J N Soni, R Chidambaram, Dilip Kumar, A Ramana Rao & V M Gopu

  2. Computer Group, Electronics Corporation of India Limited, 500 762, Hyderabad

    Dilip Kumar, A Ramana Rao & V M Gopu

Authors
  1. A Sequeira
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  2. S N Momin
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  3. H Rajagopal
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  4. J N Soni
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  5. R Chidambaram
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  6. Dilip Kumar
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  7. A Ramana Rao
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  8. V M Gopu
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Sequeira, A., Momin, S.N., Rajagopal, H. et al. An on-line TDC-312 computer-controlled neutron diffractometer. Pramana - J. Phys. 10, 289–302 (1978). https://doi.org/10.1007/BF02872027

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  • DOI: https://doi.org/10.1007/BF02872027

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