# Electron Cloud and instabilities

- Institution: CERN
- Department: CAS - CERN Accelerator School
- Speaker: Kevin Shing Bruce Li
- Year: 2022
- Level: Graduate
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3021221)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Beside the beam's own space charge, collective effects are typically triggered by the direct electromagnetic interaction of the beam with the external chamber and equipment, described through wake fields and beam-coupling impedances, and the interaction of the beam with electron or ion clouds generated in the vacuum chamber through vacuum or surface processes. They manifest themselves as macroscopic responses of the particle beams to intensity dependent excitations, resulting in observables such as coherent tune shifts, coherent instabilities or emittance growth.

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## Lectures

1. [Electron Cloud and instabilities](https://invisiblenetwork.ai/learn/cern/3021221/8175e2290827), 50 min (CERN's player)