The Secondary Electron Yield Model in ECLOUD and Comparison to CLOUDLAND Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

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Presentation transcript:

The Secondary Electron Yield Model in ECLOUD and Comparison to CLOUDLAND Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting Wilson Lab 24 September 2008

2 Charge Yield vs Energy ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Two input parameters: Peak Yield and Energy of Peak Yield Parameterization for Aluminum Default is “Noel” distribution of 2001

3 24 September 2008 Charge Yield vs Energy ECLOUD vs CLOUDLAND ECLOUD Secondary Electron Yield Model/ J.A.Crittenden ECLOUD CLOUDLAND Fortran functions sey_ecloud.f and sey_cloudland.f are posted on the CesrTA Electron Cloud Simulation wiki

4 24September 2008 Charge Yield Dependence on Incident Angle Relative to Perpendicular ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Angle out of transverse plane ignored Incident angles larger than cos Θ xy <0.2 set to cos Θ xy =0.2

5 24 September 2008 Charge Yield Dependence on Incident Angle ECLOUD vs CLOUDLAND ECLOUD Secondary Electron Yield Model/ J.A.Crittenden ECLOUD CLOUDLAND Angular dependence at low energy very different !A

6 24 September 2008 Energy Distribution for Secondaries ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Elastic Fraction Determined by parametrization of incident energy Parametrization differs for E <> 300 eV Ref: LHC-Project-Report 472 Macroparticle fraction adjusted for secondary charge Kinetic energy set equal to incident energy Momentum vector determined by reflection off wall Non-elastic Fraction Input parameter SEMAX (typically 1.8 eV in simulation guidance) Energy cutoff at E < 12 x SEMAX Log normal distribution

7 24 September 2008 Momentum Vector for True Secondaries ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Hard-coded angular distribution with sin 2 Θ uniform from 0 to 1 Most probable polar angle 45 degrees Angle out of transverse plane results from azimuthal angle thrown uniformly around wall normal vector This slide and those following show results from an example L3-1 run using the ECLOUD original primary p.e. generation model

8 24 September 2008 Secondary Yield vs Incident Energy ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Peak yield 2.0 Peak energy 310 eV The lack of angular spread in yield at high energy results from: 1) all high energies all are caused by the radial beam kicks 2) the beam-pipe is circular in this example

9 24 September 2008 Energy Distribution and Elastic Fraction ECLOUD Secondary Electron Yield Model/ J.A.Crittenden

10 24 September 2008 Energy Distribution and Elastic Fraction ECLOUD Secondary Electron Yield Model/ J.A.Crittenden 100% elastic at E=0 Non-elastic Cutoff at 21.6 eV Elastics are highest energy when beam kicks are small

11 24 September 2008 Angular Distributions for Elastics and Non-elastics ECLOUD Secondary Electron Yield Model/ J.A.Crittenden Elastic angular distribution shows grazing angles resulting from ECLOUD default primary p.e. grazing angles Elastic polar angular distribution shows reflection Non-elastics show generated distribution sin Θ = sqrt(ran), φ = 2 π ran