Study of the SEY dependence on the electron beams dose and energy

Commisso, Mario (2011) Study of the SEY dependence on the electron beams dose and energy. ll nuovo cimento C, 34 (1). pp. 103-110. ISSN 1826-9885

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During operation, the internal walls of modern particle accelerators are subjected to synchrotron radiation irradiation and/or electron bombardment. Such phenomena do affect surface properties such as the secondary electron yield, (SEY). A low SEY is a key parameter to control and overcome any detrimental effect on the accelerator performance eventually induced by the build-up of an Electron Cloud (EC). In laboratory experiments SEY reduction (called scrubbing) has been studied as a function of dose but the actual kinetic energy dependence has never been considered as an important parameter. For this reason and given the peculiar behaviour observed for low-energy electrons, we decided to study this dependence accurately. Here we report results of SEY measurements performed bombarding Cu samples obtained from the Large Hadron Collider (LHC) with different doses of electron beams with energy in the range 10–500 eV. Our results demonstrate that the potentiality of an electron beam to reduce the SEY does not only depend on its dose, but also on its energy. Furthermore, since EC build-up was predicted and observed also in the DAΦNE ring, we report some preliminary measurements on the conditioning of Al samples. An overview of future experiments which we will perform in LNF is then given.

Item Type: Article
Uncontrolled Keywords: Accelerators ; Beams in particle accelerators ; Electron impact: secondary emission
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 03 Apr 2020 15:15
Last Modified: 31 Jan 2023 14:41

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