Electron cloud simulations: beam instabilities and wakefields

Rumolo, G.; Zimmermann, Frank

doi:10.1103/physrevstab.5.121002

Cited by 47 publications

(53 citation statements)

References 7 publications

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“…Simulations performed with the HEADTAIL code [12] reproduce very well the observed travelling-wave pattern when a broad band impedance with characteristics (shunt impedance Z t , resonant frequency f res and quality factor Q) derived from beam-based measurements [13][14] is considered. The same simulations have shown that the threshold of the instability is consistent with the measured one for the same beam characteristics [6].…”

Section: Present Understanding Of the Instabilitymentioning

confidence: 99%

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Arduini

Bohl

Burkhardt

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Following the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. In this paper, we summarize the outcome of these studies and our understanding of the mechanisms leading to this instability. The corresponding intensity limitations were also determined. EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN -AB Department AbstractFollowing the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. In this paper, we summarize the outcome of these studies and our understanding of the mechanisms leading to this instability. The corresponding intensity limitations were also determined.

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Section: Present Understanding Of the Instabilitymentioning

confidence: 99%

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Arduini

Bohl

Burkhardt

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…The results have been benchmarked with three different simulation codes, namely HEAD-TAIL [7], QUICKPIC [9] and PEHTS [10]. The interaction between the electrons and the beam particles is expressed by the equation of motion dp p ds = − 2r e γ ∂φ e (r) ∂r dp…”

Section: Head-tail and Single-bunch Instabilitymentioning

confidence: 99%

“…Extensive studies on the possible electron cloud effect have been performed at SLAC for the GLC/NLC and the TESLA positron main DR [3,4,5] and the positron low emittance transport lines. The results are obtained by computer simulation codes HEAD-TAIL, QUICKPIC, PEHTS (single-bunch), CLOUD MAD (incoherent effects) and POSINST (coupled-bunch) [6,7,8,9,10] developed to study the electron cloud effect in particle accelerators. If the cloud is not suppressed, it will grow until it reaches an equilibrium density close to the neutralization level, ratio e/p=1, but in most cases the beam-cloud interaction sets a much lower limit on the acceptable cloud density.…”

Section: Introductionmentioning

confidence: 99%

Instability Thresholds And Generation of the Electron-Cloud in the GLC/NLC And Tesla Damping Rings

Pivi

Slac²

2005

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In the beam pipe of the Damping Ring (DR) of a linear collider, an electron cloud may be produced by ionization of residual gas or photoelectrons and develop by the secondary emission process [1]. Coupling between the electrons and the circulating beam can cause coupled-bunch instabilities, coherent single-bunch instabilities or incoherent tune spreads that may lead to increased emittance, beam blow-up and ultimately to beam losses. We present recent computer simulation results for the electron cloud instability thresholds in the GLC/NLC (X-Band) main DR and for the TESLA DR.

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“…Consequently, the transverse beam sizes are scaled as 1= p . The dependence of the ECI threshold on energy was simulated with the HEADTAIL code [8]. The action of the electron cloud on the bunch is lumped in one or more points along the ring.…”

mentioning

confidence: 99%

Dependence of the Electron-Cloud Instability on the Beam Energy

et al. 2008

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The electron cloud (EC) can be formed in the beam pipe of a circular accelerator if the secondary emission yield (SEY) of the inner surface is larger than 1, and it can detrimentally affect the circulating beam. Understanding the underlying physics and defining the scaling laws of this effect is indispensable to steer the upgrade plans of the existing machines and the design of new ones. The single bunch EC instability (ECI) is shown to be strongly affected by the transverse beam size. Transversely, smaller beams going through an electron cloud generate higher electron peak densities and lower the intensity threshold to make the beam unstable. In particular, since higher energy beams have smaller transverse sizes (for equal normalized transverse emittances), the scaling of the ECI threshold with the beam energy turns out to be surprisingly unfavorable.

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Electron cloud simulations: beam instabilities and wakefields

Cited by 47 publications

References 7 publications

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Fast vertical single-bunch instability at injection in the CERN SPS - an update

Instability Thresholds And Generation of the Electron-Cloud in the GLC/NLC And Tesla Damping Rings

Dependence of the Electron-Cloud Instability on the Beam Energy

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