Delay-line based 2D-multi-wire position-sensitive gaseous detectors (MW-PSGD) have been developed for neutron scattering instruments SANS-2 and ARES at FRG-1, REFSANS and MIRA at the new German high flux reactor FRM-II and the hard X-ray diffractometers HARWI and PETRA-2 at DESY in Hamburg. Within the scope of the detector development the relative resolution (R_r) of these detectors, defined as the position resolution in percentage of the detector dimension, has been improved from ~ 0.66% (ARES detector : active area: A_a = 500 mm x 500mm; wire pitch : p_w = 2mm ) to 0.4% (REFSANS detector: A_a = 500 mm x 500mm ; p_w = 2mm). These R_r-values demonstrate substantial progress in the technology of 2D-MW-PSGDs because hitherto the actual limit of resolution for such detectors has been R_r = 0.8%. The performance of these detectors (design, detection probability, spatial resolution and discrimination of gamma-radiation) is presented and the count rate capability of these modern delay-line based detectors is discussed for the case where they are linked to modern multi-hit TDC based data acquisition systems. Finally, comments on the usage and future perspectives of these detector types are made.

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