  One-dimensional single-wire chamber was developed to provide high position
resolution for powder diffraction experiments with synchrotron radiation. A
diffraction test using the sample of SiO2 has been accomplished at 1W2B
laboratory of Beijing Synchrotron Radiation Source. The data of beam test were
analyzed and some diffraction angles were obtained. The experimental results
were in good agreement with standard data from ICDD powder diffraction file.
The precision of diffraction angles was 1% to 4.7%. Most of relative errors
between measured values of diffraction angles and existing data were less than
1%. As for the detector, the best position resolution in the test was 138 um
(sigma value) with an X-ray tube. Finally, discussions of the results were
given. The major factor that affected the precision of measurement was
deviation from the flat structure of detector. The effect was analyzed and it
came to a conclusion that it would be the optimal measurement scheme when the
distance between the powder sample and detector was from 400 mm to 600 mm.
