First measurements of subpicosecond electron beam structure by autocorrelation of coherent diffraction radiation

被引：24

作者：

Lumpkin, AH

Sereno, NS

Rule, DW

机构：

[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[2] USN, Ctr Surface Warfare, Carderock Div, Bethesda, MD USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2001年 / 475卷 / 1-3期

关键词：

bunchlength; subpicosecond; coherent diffraction radiation;

D O I：

10.1016/S0168-9002(01)01639-4

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We report the initial measurements of subpicosecond electron beam structure using a nonintercepting technique based on the autocorrelation of coherent diffraction radiation (CDR). A far infrared (FIR) Michelson interferometer with a Golay detector was used to obtain the autocorrelation. The radiation was generated by a thermionic rf gun beam at 40 MeV as it passed through a 5-mm-tall slit/aperture in a metal screen whose surface was at 45 degrees to the beam direction. For the observed bunch lengths of about 450 fs (FWHM) with a shorter time spike on the leading edge, peak currents of about 100 A are indicated. Also a model was developed and used to calculate the CDR from the back of two metal strips separated by a 5-mm vertical gap. The demonstrated nonintercepting aspect of this method could allow online bunch length characterizations to be done during free-electron laser experiments. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：470 / 475

页数：6

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