Dependence of the Electron-Cloud Instability on the Beam Energy

Rumolo, G.; Arduini, G.; Métral, E.; Shaposhnikova, E.; Benedetto, Elena; Calaga, R.; Papotti, Giulia; Salvant, Benoît

doi:10.1103/physrevlett.100.144801

Cited by 15 publications

(12 citation statements)

References 6 publications

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“…These can finally contribute to the EC formation. Many parameters can affect the EC formation, such as beam energy [35], bunch spacing [36], bunch size, bunch intensity, vacuum pressure, the geometry of the vacuum pipes [37], the properties of inner surface of vacuum chamber [38], the secondary electron energy spectrum [34], etc. Table 1.…”

Section: Numerical Simulations Of Electron Cloudmentioning

confidence: 99%

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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: Numerical Simulations Of Electron Cloudmentioning

confidence: 99%

“…Various single bunch instability codes such as MICROMAP (developed at GSI) [55,56], PEHTS (developed at KEK) [35,[57][58][59][60], CMAD [61,62], and HEADTAIL (developed at CERN) [52,63] were developed to study the related effects.…”

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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“…One approach is to directly sense any induced motion of the high-energy beam and use active feedback to damp the instabilities created by the electron cloud [5]. Another approach is to directly reduce the growth of the electron clouds by reducing the secondary electron yield of the beam pipe.…”

Section: Introductionmentioning

confidence: 99%

Characterization of electron clouds in the Cornell Electron Storage Ring Test Accelerator usingTE-wave transmission

Santis

Byrd

Billing

et al. 2010

Phys. Rev. ST Accel. Beams

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A relatively new technique for measuring the electron cloud density in storage rings has been developed and successfully demonstrated [S. De Santis, J. M. Byrd, F. Caspers, A. Krasnykh, T. Kroyer, M. T. F. Pivi, and K. G. Sonnad, Phys. Rev. Lett. 100, 094801 (2008).]. We present the experimental results of a systematic application of this technique at the Cornell Electron Storage Ring Test Accelerator. The technique is based on the phase modulation of the TE mode transmitted in a synchrotron beam pipe caused by the periodic variation of the density of electron plasma. Because of the relatively simple hardware requirements, this method has become increasingly popular and has been since successfully implemented in several machines. While the principles of this technique are straightforward, quantitative derivation of the electron cloud density from the measurement requires consideration of several effects, which we address in detail.

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“…For applications requiring high brilliance [1,2] or high luminosity [3] beams, accelerators are being pushed to operate with an ever increasing number of particles. Collective effects resulting from space charge [4], wakefields [5] and electron cloud [6][7][8][9] may lead to beam instabilities that cause emittance dilution and beam loss. An exhaustive review of beam instability mechanisms and their possible mitigations are presented in [10].…”

Section: Introductionmentioning

confidence: 99%

Automatic detection of transverse beam instabilities in the Large Hadron Collider

Levens

Lasocha

Lefèvre

et al. 2019

Phys. Rev. Accel. Beams

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Transverse beam instabilities are a major cause of emittance dilution and beam losses in high intensity hadron accelerators. This paper presents an overview of the system that has been developed for automatic detection of transverse beam instabilities in the Large Hadron Collider at CERN. It relies on the detection of very small transverse beam oscillations using a high sensitivity tune measurement system. These oscillations are then processed online in a field programmable gate array to monitor the growth of any instabilities. When an instability is detected, the acquisition of intrabunch beam position data with a multigigahertz bandwidth is triggered. This data allows identification of unstable bunches within bunch trains and provides information on the temporal signature of the instability. The design of these systems and the different algorithms for instability detection that have been tested with beam will be presented along with a detailed description of their performance.

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Dependence of the Electron-Cloud Instability on the Beam Energy

Cited by 15 publications

References 6 publications

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Some Key Issues of Vacuum System Design in Accelerators and Colliders

Characterization of electron clouds in the Cornell Electron Storage Ring Test Accelerator usingTE-wave transmission

Automatic detection of transverse beam instabilities in the Large Hadron Collider

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