Observations on background in PHOBOS and related electron cloud simulations

Rumolo, G.; Fischer, W.

doi:10.2172/1061738

Cited by 25 publications

(40 citation statements)

References 5 publications

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“…The simulation has been performed here with the PIC code; the agreement with the evolution predicted by the soft-Gaussian code is excellent, as may be deduced from the pictures in Ref. [12]. The simulations also yield the evolution of centroid or head-tail motion and the beam emittance growth as a function of time.…”

Section: Resultsmentioning

confidence: 59%

Simulation of single bunch instabilities driven by electron cloud in the SPS

Rumolo

Zimmermann²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Photoemission, or gas ionization, and secondary emission can give rise to a quasi-stationary electron cloud inside the beam pipe through a beam-induced multipacting process. We investigate single bunch instabilities driven by a quasi-stationary electron cloud by means of a computer simulation. The model that we apply makes use of two sets of macroparticles for both the bunch particles and for the electrons, which interact at one or more locations along the beam orbit. Two different schemes have been implemented for the electron cloud field calculation (PIC and soft-Gaussian), and their efficiencies are compared. The code is used to simulate possible instability mechanisms in the SPS. The options of a broad-band wake-field and space charge induced tune spread have been also introduced in order to follow the bunch evolution under the combined effect of the electron-cloud and a broad-band impedance.

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Section: Resultsmentioning

confidence: 59%

Simulation of single bunch instabilities driven by electron cloud in the SPS

Rumolo

Zimmermann²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…It is likely that the bunch shortening triggered the formation of an electron cloud. This has also been seen at another location in the ring [6]. No electron detectors are installed in the collimator region.…”

Section: Observationsmentioning

confidence: 66%

Electron Cloud Driven Vacuum Instability

Fischer¹,

Iriso²

2005

AIP Conference Proceedings

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Abstract. Electron clouds are shown to cause pressure rises in the Relativistic Heavy Ion Collider. In a number of cases beam induced vacuum instabilities were seen where the pressure grows exponentially with time. We analyze under which conditions electron clouds can lead to these vacuum instabilities. We consider as the feedback mechanism for the instability the following: rest gas ionization by electrons in the cloud and the beam, subsequent acceleration of the ions by the beam, and molecular desorption induced by the ions hitting the wall, leading to increased pressure and thus higher ionization rates.

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“…The criteria for the protection are based on the assumed safe beam limit, which is taken as 10 12 protons. Tracking studies showed that settings of 6.8σ for the TDI and TCLI systems adequately protect the LHC arc aperture against MKI flashovers [3].…”

Section: Protection Against Injection Errorsmentioning

confidence: 99%

Challenges and Plans for Injection and Beam Dump

Barnes¹,

Uythoven²,

Goddard³

et al. 2015

The High Luminosity Large Hadron Collider

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The injection and beam dumping systems of the LHC will need to be upgraded to comply with the requirements of operation with the HL-LHC beams. The elements of the injection system concerned are the fixed and movable absorbers which protect the LHC in case of an injection kicker error and the injection kickers themselves. The beam dumping system elements under study are the absorbers which protect the aperture in case of an asynchronous beam dump and the beam absorber block. The operational limits of these elements and the new developments in the context of the HL-LHC project are described.

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Observations on background in PHOBOS and related electron cloud simulations

Cited by 25 publications

References 5 publications

Simulation of single bunch instabilities driven by electron cloud in the SPS

Simulation of single bunch instabilities driven by electron cloud in the SPS

Electron Cloud Driven Vacuum Instability

Challenges and Plans for Injection and Beam Dump

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