A Bonsendash;Hart ultrasmallhyphen;angle xhyphen;ray scattering (USAXS) instrument has been designed, constructed, and tested employing a synchrotron xhyphen;ray source. The instrument permits experiments ranging from below 0thinsp;deg;C up to about 400thinsp;deg;C, as well as temperature scanning, jumping, quenching, and annealing experiments. The mechanical elements used Super Invar as the basic building material in order to minimize the thermal expansion effect. As the synchrotron beam after the beamline optics is already somewhat collimated and monochromatized, a very fine tuning of the first crystal was necessary. The highhyphen;temperature Bonsendash;Hart instrument increased the performance by a factor of about 10 when compared with our earlier roomhyphen;temperature Bonsendash;Hart instrument using the same set of channelhyphen;cut germanium crystals. The instrument was tested by using a suspension of polystyrene latex spheres and by combining the USAXS measurement, for the first time, with measurements of the same latex suspension by means of laser light scattering. thinsp;
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