Abstract
Synchrotron radiation (SR) offers a unique chance to study the structure of a substance in fast processes. Since SR is emitted by electron bunches in a storage ring, the SR burst corresponding to a single bunch may be very short. Should a detector capable of detecting SR from a single bunch without mixing signals from different bunches be available, it is possible to obtain information on changes in the state of the material in a sample under investigation with a very high time resolution. A detector for imaging of explosions on an SR beam—DIMEX—has been developed by the Budker Institute of Nuclear Physics (Siberian Division of the Russian Academy of Sciences, Novosibirsk). This detector is a high-pressure ion-ization chamber with a strip readout at a pitch of 0.1 mm. The electron component of primary ionization is collected within 50 ns, which is substantially shorter than the orbital period of a bunch in the VEPP-3 storage ring (250 ns). The DIMEX is filled with a Xe—CO2 mixture (3: 1) at an absolute pressure of 7 atm. The spatial resolution of the detector is ∼210 µm, and its efficiency for radiation with an energy of 20 keV is ≥50%. The dynamic range of the detector is ∼100, which allows one to measure the signal with an accuracy of ∼1%. In this case, the maximum flux of X-ray photons, at which the DIMEX operates in a linear region, is ∼1010 photons/(channel s). Today, the detector has been used in experiments aimed at studying evolution of the density in detonation waves and processes of nanoparticle production at the VEPP-3 storage ring by employing the small-angle X-ray scattering technique.
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Original Russian Text © V.M. Aulchenko, O. V. Evdokov, I.L. Zhogin, V V. Zhulanov, E.R. Pruuel, B.P. Tolochko, K.A. Ten, L.I. Shekhtman, 2010, published in Pribory i Tekhnika Eksperimenta, 2010, No. 3, pp. 20–35.
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Aulchenko, V.M., Evdokov, O.V., Zhogin, I.L. et al. A detector for imaging of explosions on a synchrotron radiation beam. Instrum Exp Tech 53, 334–349 (2010). https://doi.org/10.1134/S0020441210030036
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DOI: https://doi.org/10.1134/S0020441210030036