Radiation from Relativistic Electrons in Periodic Structures "RREPS-15"

Estimation of the spatial sizes of ultra relativistic electrons beam from angular distribution of their emission in thin crystals

7 Sept 2015, 15:30

15m

Oral 7. Processes with Crystalline Targets 7. Processes with Crystalline Targets

Speaker

Prof. Igor Vnukov (Belgorod National Research University 14 Studencheskaya str., 308007 Belgorod, Russia)

Description

The use of ultra relativistic electron (positron) emission in thin crystals to estimate particle beam spatial sizes for projected electron-positron colliders [1,2] is proposed. The existing position-sensitive X-ray range detectors and the average path of secondary electrons in a detector restrict the minimum value of the measured beam size to a level of approximately 10 μm, which is far greater than the planned sizes of the collider beams which are less than 100 nm [1,2]. We propose to estimate the electron (positron) beam divergence over the diffracted transition radiation in thin crystals which is predominent in a narrow cone near the Bragg direction for partcles anergy of greater 10 GeV [3] from angular distribution measurements. The spatial sizes can be obtained from the beam divergence in both planes and the calculated beam emittance or the measured one, which is obtained during the earlier stage of acceleration using optical transition radiation or optical diffraction one. The problem of crystals destruction under the influence of a high intensity electron beam is discussed. The use of surface parametric X-ray radiation [4], where the problem of crystal destruction is almost absent, to measure the electron beam parameters is proposed. This work was supported by a grant from the Russian Science Foundation (Project N 15-12-10019) References 1. ILC Technical Design Report, 2013. 2. A Multi-TeV Linear Collider Based on CLIC Technology: CLIC Conceptual Design Report, 2012. 3. Yu.A. Goponov et.al// Nucl. Instrum. Methods B 355 (2015) 150. 4. A.I. Benediktovitch, I.D. Feranchuk // J. Phys. Conf. Ser. 236 (2010) 012015.