Electron cloud instability studies in the Beijing Electron Positron Collider

Wang, JQ; Guo, Zhen; Liu, YD; Qin, Q.; Xing, Jian; Zhao, Zhentang

doi:10.1103/physrevstab.7.094401

Cited by 9 publications

(9 citation statements)

References 5 publications

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“…And in the case of synchrotron radiation, the instability caused by EC is analogous to the transverse mode coupling instability (TMCI) [50]. The impacts of space charge, magnetic field, the chromaticity, the amplitude detuning, and the broad-band resonator are also considered in the study of the bunch instability caused by EC [50][51][52][53].…”

Section: Single and Coupled Bunch Instabilitiesmentioning

confidence: 99%

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Wang¹,

Wang²

2020

Accelerators and Colliders

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As we all know, vacuum system is the essential part for the accelerators and colliders, which provide the vacuum environment to minimize beam-gas interactions and maintain normal operation of the beams. With the proposals of future accelerators and colliders, such as Future Circular Collider (FCC), Super Proton-Proton Collider (SPPC), and International Linear Collider (ILC), it is time to review and focus on the key technologies involved in the optimization designs of the vacuum system of various kinds of accelerators and colliders. High vacuum gradient and electron cloud are the key issues for the vacuum system design of high-energy accelerators and colliders. This chapter gives a brief overview of these two key issues of vacuum system design and operations in high-energy, highintensity, and high-luminosity accelerators and collider. Keywords: vacuum system, beam-gas interaction, electron cloud, secondary electron yield, non-evaporable gettersAccelerators and Colliders 2 the detailed information of Higgs self-coupling and the mechanism of electroweak symmetry breaking. FCC-ee [25, are the two stages of Future Circular Collider (FCC) [28]. FCC has a center-of-mass energy of 100 TeV with proton-proton collisions finally. The key parameters of CEPC, FCC-hh, FCC-ee, HE-LHC, HL-LHC, and LHC are shown in Table 1.Beam-related instabilities and electron cloud are the critical aspects for vacuum system of the high-energy, high-intensity, and high-luminosity accelerators, which could affect the machine performance and operation [33].

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Section: Single and Coupled Bunch Instabilitiesmentioning

confidence: 99%

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Wang¹,

Wang²

2020

Accelerators and Colliders

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“…Solenoids had been successfully used in other machines to suppress electron clouds, for example, in KEKB [72], PEP-II [5], and BEPC [73].…”

Section: Solenoidsmentioning

confidence: 99%

Electron cloud observations and cures in the Relativistic Heavy Ion Collider

Fischer

Blaskiewicz

Brennan

et al. 2008

Phys. Rev. ST Accel. Beams

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Since 2001, the Relativistic Heavy Ion Collider has experienced electron cloud effects, some of which have limited the beam intensity. These include dynamic pressure rises (including pressure instabilities), tune shifts, a reduction of the instability threshold for bunches crossing the transition energy, and possibly incoherent emittance growth. We summarize the main observations in operation and dedicated experiments as well as countermeasures including baking, nonevaporable getter coated warm beam pipes, solenoids, bunch patterns, antigrazing rings, prepumped cold beam pipes, scrubbing, and operation with long bunches.

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“…For several years now, a growing number of observations of the electron cloud (EC) effects have been recorded in several high-energy particle accelerators [1][2][3][4]. The term EC refers to the accumulation of electrons inside an accelerator beam pipe capable of affecting the accelerator operation by causing emittance growth, vacuum pressure increase, and possibly beam loss and degradation of the beam diagnostics.…”

Section: Introductionmentioning

confidence: 99%

“…During operation, the internal walls of the particle accelerators are exposed to synchrotron radiation and/or electron bombardment that can cause desorption of gases and production of primary electrons. These may be accelerated by the Coulomb potential of the circulating beam producing secondary electrons and leading to EC buildup [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of the surface processing on the secondary electron yield of Al alloy samples

Grosso

Commisso

Cimino

et al. 2013

Phys. Rev. ST Accel. Beams

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In this study we have investigated the relation between the secondary electron yield (SEY) and the surface chemical state for technical Al alloy samples cut from the inner walls of the Petra III storage ring. SEY curves measured after prolonged electron beam irradiation at 500 eV showed maximum values ( max ) between 1.8 and 1.5. By combining x-ray photoelectron spectroscopy with SEY measurements, we have been able to relate the surface chemical composition to the max values for the ''as-received'' surface ( max ¼ 2:7), for the electron beam conditioned sample ( max ¼ 1:8 À 1:5), and after substantially removing the surface contaminating layer by means of Ar þ ion sputtering ( max ¼ 1:3). Our detailed chemical analysis shows that the SEY strongly increases in the presence of the thin surface oxide film which unavoidably forms on the clean Al alloy sample under electron beam irradiation even in ultrahigh vacuum conditions, and suggests that the high reactivity of pure Al and Al alloys to oxygen could be the cause of the difference among the SEY values measured in different ultrahigh vacuum environments.

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Electron cloud instability studies in the Beijing Electron Positron Collider

Cited by 9 publications

References 5 publications

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Electron cloud observations and cures in the Relativistic Heavy Ion Collider

Effect of the surface processing on the secondary electron yield of Al alloy samples

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