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First Attempt to Simulate the Shielded Button Measurements with ECLOUD

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Presentation on theme: "First Attempt to Simulate the Shielded Button Measurements with ECLOUD"— Presentation transcript:

1 First Attempt to Simulate the Shielded Button Measurements with ECLOUD
All material for this talk, including full sets of the analysis plots, may be obtained at Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Meeting 7 April 2010

2 The time scales are absolute, synchronized to the bunch passage.
Measurements of 16 March 2010 5.3 GeV, two bunches, 8 mA, 15E (TiN) Positrons Electrons The time scales are absolute, synchronized to the bunch passage. The time resolution is subnanosecond, both rising and trailing edge. The electron beam shows a remarkably sharper time structure.

3 Synchrotron Radiation Analysis of Pretzel-off CHESS optics
Positrons Electrons The direct synchrotron radiation photon rate is an order of magnitude smaller for electrons.

4 ECLOUD input parameters
1.28e11 (8 mA) 2 n.a. 4.2 (14 ns) e+: e-: 18.8 e+: e-: 0.205 e+: e-: 0.1 ( g / m / e ) e+: e-: 0.118 n.a. 20% 1.0 (0.9 t.s. & 0.1 rediff) 400 SEY estimated for processed TiN. Numerical parameters large: 1000 steps, 101 kicks, 250k m.p. per bunch.

5 Beampipe-averaged Cloud Density
Positrons Electrons The direct synchrotron radiation photon rate is an order of magnitude smaller for electrons and the decay time between bunches is much greater. But the beampipe-averaged density is only weakly related to the shielded button signal.

6 Comparison of Simulated Signal to Measurement -- Positrons --
Measurement (Central Button) ECLOUD Simulation Simulation counts cloud charges in three adjacent 1-cm wide stripes centered on the top of the beampipe. The angle of incidence is required to be less than 45 degrees (cosq > 0.7, probably not strict enough). Any macroparticle contributing to the shielded button signal is removed from the cloud.

7 Comparison of Simulated Signal to Measurement -- Electrons --
Measurement (Central Button) ECLOUD Simulation Many types of discrepancy for the case of the electron beam. Particularly notable are the relative magnitudes of the two signals and the sharper time structure in the simulation.

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