Ultrarelativistic electron beam spatial size estimation from angular distribution emission in thin crystals

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• 作者：Yu.A. Goponov^a ; M.A. Sidnin^a ; K. Sumitani^b ; Y. Takabayashi^b ; I.E. Vnukov^a ; ^{vnukov@bsu.edu.ru" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Collider ; Electron beam divergence ; Beam size ; Crystal ; Diffracted transition radiation ; Crystal structure destruction
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：808
• 期：Complete
• 页码：71-76
• 全文大小：480 K

文摘

The use of ultrarelativistic electron (positron) emission in thin crystals to estimate particle beam spatial sizes for projected electron–positron colliders is proposed. The existing position-sensitive X-ray range detectors 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 collider beams. We propose to estimate the electron (positron) beam divergence over the diffracted transition radiation from angular distribution measurements. The spatial size can be obtained from the calculated beam emittance or the experimental emittance, which is measured during the earlier stage of acceleration using optical transition or optical diffraction radiation. The problem of crystal destruction under the influence of a high-intensity electron beam is discussed. The use of surface parametric X-ray radiation, where the problem of crystal destruction is almost absent, to measure the electron beam parameters is also discussed.