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Bragg spectroscopy is one of the best established experimental methods forhigh energy resolution X-ray measurements; however, this technique is limitedto the measurement of photons producedfrom well collimated (tens of microns) orpoint-like sources and becomes quite inefficient for photonscoming fromextended and diffused sources. The possibility to perform simultaneousmeasurementsof several energies is strongly demanded when low rate signals areexpected and single angular scansrequire long exposure times. A prototype of ahigh resolution and high precision X-ray spectrometerworking also with extendedisotropic sources, has been developed by the VOXES collaboration atINFNLaboratories of Frascati, using Highly Annealed Pyrolitic Graphite (HAPG)crystals in a semi- Von Hamos configuration, in which the position detector isrotated with respect to thestandard Von Hamos one, to increase the dynamicenergy range. The aim is to deliver a cost effectivesystem having an energyresolution at the level of eV for X-ray energies from about 2 keV up to tensofkeV, able to perform sub-eV precision measurements with non point-like sources.The proposedspectrometer has possible applications in several fields, goingfrom fundamental physics to quantummechanics tests, synchrotron radiation andX-FEL applications, astronomy, medicine and industry.In particular, thistechnique is fundamental for a series of nuclear physics measurements like,forexample, the energies of the exotic atoms radiative transitions which allowto extract fundamentalparameters in the low energy QCD in the strangenesssector. In this work, the working principleof the spectrometer is presented,together with the tests and the results, in terms of resolution andsource, sizeobtained for Fe(K\alpha1,2), Cu(K\alpha1,2), Ni(K\beta), Zn(K\alpha1,2),Mo(K\alpha1,2) and Nb(K\beta)lines.

Development of a compact HAPG crystal Von Hamos X-ray spectrometer forextended and diffused sources