Akkuratov, V. I.

Blagov, A. E.

Eliovich, Ya. A.

Kocharyan, Vagan Rashidovich

Kovalchuk, M. V.

Kulikov, A. G.

Mkrtchyan, Alpik Rafaelovich

Movsisyan, A. E.

Muradyan, T. R.

Pisarevsky, Yu. V.

Seregin, A. M.

Targonskiy, A. V.

English

Electronic archive of Tomsk Polytechnic University

XIII International Symposium RREPS-19, 15-20 September 2019, Belgorod, Russia 135Adaptive X-ray Optical Elements Based on Longitudinaland Transverse Acoustic Waves in the KHz and MHzFrequency RangesA.E.Blagova,b, A.R.Mkrtchyanc,d, V.R.Kocharyanc,d,A.E.Movsisyanc, T.R.Muradyanc, V.I.Akkuratova,b,Ya.A.Eliovicha,b, A.G.Kulikova,b, Yu.V.Pisarevskya,b,A.M.Seregina,b, A.V.Targonskiya,b1, M.V.Kovalchuka,ba FSRC ”Crystallography and photonics” RAS, Moscow, Russiab National Research Centre ”Kurchatov Institute”, Moscow, Russiac Institute of Applied Problems of Physics NAS of Armenia, Yerevan, Armeniad National Research Tomsk Polytechnic University, Tomsk, RussiaX-ray acoustic interactions allowing to implement the control of X-ray parameters are widelystudied. Among the numerous researches, it is possible to highlight the ability of controlling thespatial and energy spectrum of X-ray radiation [1] and the effect of redistribution of intensitybetween transmitted and diffracted beam [2]. This paper describes the implementation of acombination of these two possibilities.Fast control of X-ray parameters, including scanning diffraction conditions and controllingby times much shorter than possibilities of traditional approaches, is a very relevant scientifictask. It will be shown that overcoming of limitation of traditional approach, such as complexgoniometric systems, possible by using of non-mechanical adaptive X-ray optic elements, suchas X-ray acoustic resonators of longitudinal oscillations or bimorph piezo-actuators. It allowsfast and precise variation of X-ray diffraction parameters, varying the angular position of theX-ray beam and controlling its wavelength. Description of schemes and elements for fast tuningof beam parameters will be given.The effects of the redistribution of intensities between the diffracted and transmitted X-raybeams under the conditions of excitation of resonant acoustic thickness oscillations in quartzcrystals were investigated. It has been established that the effect of increasing the intensity ofa diffracted beam almost linearly depends on the amplitude of ultrasound (the FWHM of therocking curves does not change at the same time) and is observed for all the studied reflexes.The time characteristics of the observed effects upon excitation and relaxation of ultrasonicoscillations were investigated for the first time: the process of increasing intensity takes about250 microseconds, then its oscillation is observed for about 1 millisecond, and the process ofcomplete relaxation takes about 1.5 milliseconds. Preliminary design of elements combiningthickness and longitudinal oscillations are considered, several schemes of implementation areproposed. The effect of intensity redistribution in Potassium and Rubidium hydrogen phthalatecrystals, which are emerging materials for creating a two-frequency element, was studied forthe first time.Prospects of implementation of such methods and elements at synchrotron radiation as wellas laboratory sources will be discussed.The reported study was partially supported in the framework of the joint programs of theRussian Foundation for Basic Research (project No 18-52-05024 Arm_a and No18-32-20108mol_a_ved) and Science Committee of Ministry of Education and Science of Armenia (projectNo18RF-142) as well as the Council on Grants of the President of the Russian FederationMK-2451.2018.2.References[1] A.E.Blagov, M.V.Kovalchuk et al. JETP letters, t.128, 5 (11) (2005). P.893.[2] A.P.Mkrtchyan, M.A.Navasardyan, V.K.Mirzoyan. JTP letters, 8, 677 (1982).1 Corresponding author: Targonsky_av@nrcki.ru

Adaptive X-ray Optical Elements Based on Longitudinal and Transverse Acoustic Waves in the KHz and MHz Frequency Ranges

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Adaptive X-ray Optical Elements Based on Longitudinal and Transverse Acoustic Waves in the KHz and MHz Frequency Ranges

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