RedOffice.com Presentation templates Slide No. 1 RFA Detector Data of Electron Cloud Build-up and Simulations Eric Wilkinson Mentor: Jim Crittenden Cornell.

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Presentation transcript:

RedOffice.com Presentation templates Slide No. 1 RFA Detector Data of Electron Cloud Build-up and Simulations Eric Wilkinson Mentor: Jim Crittenden Cornell LEPP REU, summer 2009./go

RedOffice.com Presentation templates Slide No. 2 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 Eric Wilkinson

RedOffice.com Presentation templates Slide No. 3 2-D ECloud Simulation Predict Cloud Density and Time Development Simulation Weak Solenoid Chamber Coating Grooves Solution RFA Ben Me SLAC Eric Wilkinson Electron Cloud Limits Performance of ILC Damping Rings

RedOffice.com Presentation templates Slide No. 4 Cloud Dynamics Beam Kicks Saturation Point Low Bunch Currents High Space-Charge Field Ex. Field Dependence Striping Walling Resonance Chicane Field [Courtesy Joe Calvey] Eric Wilkinson

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

RedOffice.com Presentation templates Slide No. 6 RFA Detector Evidence for Resonance 4ns, 2GeV TiN, Collector 1 Al, Collector 1 Eric Wilkinson

RedOffice.com Presentation templates Slide No. 7 Searching For Resonance in ECloud Exponential Growth Problem Do not see saturation, do not see significant effects of resonance Eric Wilkinson [n=20] B=894 Gauss

RedOffice.com Presentation templates Slide No. 8 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 Eric Wilkinson

RedOffice.com Presentation templates Slide No. 9 f Questions? Eric Wilkinson