Adjustment method of vertically focused monochromator of neutron diffractometer

The article introduces the basic principle of the vertically focused monochromator used in neutron scattering spectrometer which has been installed in Institute of Nucleus Physics and Chemistry as well as the adjustment method of the monochromator. The central position and dimension of neutron beam were determined by using neutron radiography, and the available area of the beam was obtained by scanning the sample position along horizontal and vertical directions. The biggest neutron fluence was measured at the sample position. The measured neutron fluence rate data show that almost double gain was got at the sample position. (authors)