Nature of the Decrease of the Secondary-Electron Yield by Electron Bombardment and its Energy Dependence

被引：73

作者：

Cimino, R. ^{[1
]}

Commisso, M. ^{[1
]}

Grosso, D. R. ^{[1
]}

Demma, T. ^{[2
]}

Baglin, V. ^{[3
]}

Flammini, R. ^{[1
,4
]}

Larciprete, R. ^{[1
,5
]}

机构：

[1] Ist Nazl Fis Nucl, LNF, I-00044 Frascati, Roma, Italy

[2] Univ Paris 11, CNRS, IN2P3, Lab Accelerateur Lineaire, F-91405 Orsay, France

[3] CERN, Geneva, Switzerland

[4] CNR, IMIP, I-00019 Monterotondo, RM, Italy

[5] CNR, ISC, I-00133 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 06期

关键词：

CLOUD SIMULATIONS; C1S PHOTOEMISSION; GRAPHITE; SPECTRA;

D O I：

10.1103/PhysRevLett.109.064801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed a combined secondary electron yield (SEY) and x-ray photoelectron spectroscopy study as a function of the electron dose and energy on a Cu technical surface representative of the LHC accelerator walls. The electron bombardment is accompanied by a clear chemical modification, indicating an increased graphitization as the SEY decreases. The decrease in the SEY is also found to depend significantly on the kinetic energy of the primary electrons. When low-energy primary electrons are employed (E <= 20 eV), the reduction of the SEY is slower and smaller in magnitude than when higher-energy electrons are used. Consequences of this observation are discussed mainly for their relevance on the commissioning scenario for the LHC in operation at CERN (Geneva), but are expected to be of interest for other research fields.

引用

页数：5

共 27 条

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[Anonymous], 2001, P INT WORKSH 2 STREA

[2]

[Anonymous], CERNSLNOTE2002016

[3]

[Anonymous], 2007, P INT WORKSH EL CLOU

[4]

Baglin V., 2001, 472 CERN LHC PROJ

[5] Secondary electron yield measurements of carbon covered multilayer optics [J].