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

1 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

2 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

3 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

4 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

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

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

7 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

8 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

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

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