Longitudinal profile diagnostic scheme with subfemtosecond resolution for high-brightness electron beams

被引：16

作者：

Andonian, G. ^{[1
,2
]}

Hemsing, E. ^{[1
]}

Xiang, D. ^{[3
]}

Musumeci, P. ^{[1
]}

Murokh, A. ^{[2
]}

Tochitsky, S. ^{[4
]}

Rosenzweig, J. B. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] RadiaBeam Technol, Santa Monica, CA 90404 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2011年 / 14卷 / 07期

关键词：

D O I：

10.1103/PhysRevSTAB.14.072802

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

High-resolution measurement of the longitudinal profile of a relativistic electron beam is of utmost importance for linac based free-electron lasers and other advanced accelerator facilities that employ ultrashort bunches. In this paper, we investigate a novel scheme to measure ultrashort bunches (subpico-second) with exceptional temporal resolution (hundreds of attoseconds) and dynamic range. The scheme employs two orthogonally oriented deflecting sections. The first imparts a short-wavelength (fast temporal resolution) horizontal angular modulation on the beam, while the second imparts a long-wavelength (slow) angular kick in the vertical dimension. Both modulations are observable on a standard downstream screen in the form of a streaked sinusoidal beam structure. We demonstrate, using scaled variables in a quasi-1D approximation, an expression for the temporal resolution of the scheme and apply it to a proof-of-concept experiment at the UCLA Neptune high-brightness injector facility. The scheme is also investigated for application at the SLAC NLCTA facility, where we show that the subfemtosecond resolution is sufficient to resolve the temporal structure of the beam used in the echo-enabled free-electron laser. We employ beam simulations to verify the effect for typical Neptune and NLCTA parameter sets and demonstrate the feasibility of the concept.

引用

页数：8

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