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A new thermal neutron detector for protein crystallography

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6 Author(s)
Mahler, G.J. ; Brookhaven Nat. Lab., Upton, NY, USA ; Radeka, V. ; Schaknowski, N.A. ; Smith, G.C.
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A new position-sensitive detector is being developed for protein crystallography studies at a spallation source. Based on eight, independent, wire proportional chamber segments housed in a curved pressure vessel, the device covers a scattering angle of 120 degrees, and has a collecting area of 1.5 m by 20 cm. The position resolution will be about 1.3 mm FWHM, with a total counting rate in excess of one million per second. Timing resolution, essential for a spallation source application, is of order 1 /spl mu/s and provides neutron energy determination that is well suited for crystallography. Advanced features of this device include a digital centroid finding scheme, a seamless readout between segments, and a wire array design that minimizes anode modulation. Details of the mechanical design are given, together with digital centroid measurements that illustrate accurate, uniform response.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:46 ,  Issue: 6 )

Date of Publication:

Dec. 1999

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