Speaker
Prof.
Igor Vnukov
(Belgorod sate university, Belgorod, Russia)
Description
Projected International Linear Collider [1] and Compact Linear Collider [2] need new measurement methods of parameters of relativistic electron beam with size of some nm and divergence about 10-40 $\mu$rad. Using of fast electrons diffracted transition radiation (DTR) in thin crystals for beam divergence measurements [3] is really impossible because of the crystals destroying [4]. Using of diffracted diffraction radiation (DDR) of electrons in crystals [5] is practically unrealized also because of small wavelength $\lambda$ and necessity of $b<0.1\gamma\lambda$ condition fulfilment, where $\gamma$ and $b$ are relativistic factor and the distance between the crystal and the electron beam, respectively.
Decision of the problem may be the wavelength increasing by means of using of multilayer X-ray mirror providing a rather high selectivity $\Delta\lambda/\lambda\sim$ 0.04 and reflectivity up to 30-40\% [6]. Analysis of known methods of X-ray mirrors parameters calculation such as reflectivity and angular resolution and their dependence from the mirrors composition and observation angle are performed. Calculation of the DDR angular distributions was made for the selected method and measurement condition. The proof-of-principle experiment may be performed on already existing electron accelerators. Desirable X-ray mirror parameters and needful experimental equipment for the experiment at Mainz microtron and KEK-ATF accelerator are discussed.
References
[1] ILC Technical Design Report, 12 June 2013 www.linearcollider.org/ILC/TDR
[2] A Multi-TeV Linear Collider Based on CLIC Technology: CLIC Conceptual Design Report, 2012. http://clic-study.web.cern.ch/content/conceptual-design-report
[3] Goponov Yu.A. et al. NIM, 2016, A808, P. 71
[4] Babaev A.A., Gogolev A.S. J. Phys. Conf. Ser. 732 (2016) 012030.
[5] Goponov Yu.A. et al. NIM, 2018, A885, P. 134
[6] Barysheva M.M. et al. Physics-Uspekhi. 2012. V. 55. P. 681.
Primary author
Prof.
Igor Vnukov
(Belgorod sate university, Belgorod, Russia)
