An on-line TDC-312 computer-controlled neutron diffractometer |
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Authors: | A Sequeira S N Momin H Rajagopal J N Soni R Chidambaram Dilip Kumar A Ramana Rao V M Gopu |
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Institution: | (1) Neutron Physics Section, Bhabha Atomic Research Centre, 400 085 Bombay;(2) Computer Group, Electronics Corporation of India Limited, 500 762 Hyderabad |
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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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Keywords: | Computer controlled diffractometer four-circle neutron diffractometer diffractometer control software |
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