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Comparison of Primary Photoelectron Generation in ECLOUD, CLOUDLAND and POSINST Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

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Presentation on theme: "Comparison of Primary Photoelectron Generation in ECLOUD, CLOUDLAND and POSINST Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education."— Presentation transcript:

1 Comparison of Primary Photoelectron Generation in ECLOUD, CLOUDLAND and POSINST Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting Wilson Lab 23 August 2008

2 2 Angle Relative to Perpendicular of Cloud Electrons on Beampipe Wall Primary Photoelectron Generation/ J.A.Crittenden ECLOUD CLOUDLAND POSINST Why do the lost cloud macroparticles hit the beampipe wall at grazing incidence in ECLOUD?

3 3 23 August 2008 Primary Photoelectron Production Angles Primary Photoelectron Generation/ J.A.Crittenden CLOUDLANDPOSINSTECLOUD dN/d  Z dN/d  ➢ ECLOUD generates at grazing angles, in part due to a large longitudinal component. It also has an apparent bug which results in indeterminate kinetic energy. ➢ CLOUDLAND generates predominantly near perpendicular, with the narrowest longitudinal component. ➢ POSINST prefers production angles at 45 degrees relative to perpendicular.

4 4 23 August 2008 Angle Relative to Perpendicular of Cloud Electrons on Beampipe Wall Primary Photoelectron Generation/ J.A.Crittenden dN/d  (sin    dN/d  dN/d(cos  dN/d  CLOUDLAND (rescaled) POSINST (rescaled) POSINST Primary PE ECLOUD Primary PE CLOUDLAND Primary PE ECLOUD with various primary PE distributions ➢ Much improved comparison, but work remains ➢ Need convention for comparison quantities ➢ How to choose which generation algorithm?

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