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Electron Cloud Phenomena: Understanding Effects on ILC Damping Rings

This presentation explores the electron cloud phenomenon and its implications for ILC damping rings. Key topics include primary photoelectron production, variable internal reflectivity, secondary electron yield (SEY), and the impact of electron clouds on performance, including multipacting and resonance effects. We discuss the predictive capabilities of 2-D ECloud simulations for cloud density and time development, as well as significant dynamics such as beam kicks, saturation points, and the influence of space-charge fields. The role of RFA detectors in evidence gathering for resonance in electronic clouds is also highlighted.

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Electron Cloud Phenomena: Understanding Effects on ILC Damping Rings

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  1. Eric Wilkinson Mentor: Jim Crittenden Cornell LEPP REU, summer 2009 RedOffice.com Presentation templates RFA Detector Data of Electron Cloud Build-up and Simulations ./go

  2. RedOffice.com Presentation templates Eric Wilkinson Electron Cloud Phenomenon • Primary Photoelectron Production • Variable Internal Reflectivity • Photoelectron Production Rate • Secondary Electron Yield (SEY) • Yield >1 Leads to Multipacting • Determine Yield and Angular Distribution • Primary Disturbance in Emittance

  3. RedOffice.com Presentation templates Eric Wilkinson 2-D ECloud Simulation Predict Cloud Density and Time Development Weak Solenoid Chamber Coating Grooves Simulation Solution Me SLAC Ben RFA Electron Cloud Limits Performance of ILC Damping Rings

  4. RedOffice.com Presentation templates Eric Wilkinson Cloud Dynamics • Beam Kicks • Saturation Point • Low Bunch Currents • High Space-Charge Field • Ex. Field Dependence • Striping • Walling • Resonance • Chicane Field [Courtesy Joe Calvey]

  5. Eric Wilkinson RedOffice.com Presentation templates Example ECloud Outputs for 8ns Spacing “Pinching” “Saturation” [No External Field]

  6. RedOffice.com Presentation templates Eric Wilkinson RFA Detector Evidence for Resonance 4ns, 2GeV Al, Collector 1 TiN, Collector 1

  7. Eric Wilkinson RedOffice.com Presentation templates Searching For Resonance in ECloud • Exponential Growth Problem • Do not see saturation, do not see significant effects of resonance [n=20] B=894 Gauss

  8. RedOffice.com Presentation templates Eric Wilkinson My Role • Run ECloud simulations to match RFA data • Identify SEY and other parameters • Aid in the search and understanding of Resonance Effects within ECloud • Have Fun

  9. Questions? Eric Wilkinson RedOffice.com Presentation templates f

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