Space Charge Electric-Field Calculations for Coherent Tune Shift Estimations using the Electron-cloud Modelling Algorithm ECLOUD Jim Crittenden Cornell.

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Presentation transcript:

Space Charge Electric-Field Calculations for Coherent Tune Shift Estimations using the Electron-cloud Modelling Algorithm ECLOUD Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting Wilson Lab 14 January 2009

2 Overview of Modelling Parameters and Data Sets ECLOUD Electric Field Calculations/ J.A.Crittenden CesrTA Electron Cloud Simulation wiki page: Simulation Guidance Parameters TS0407 CESR measurements in CESR-c configuration in April, GeV - Ten 0.75 mA bunches, followed by ten empty bunches, 14 ns spacing Beam RMS size 0.16 x x 12.6 mm. ECLOUD bunch time sigma: 0.29 ns Elliptical beam pipe 4.5 x 2.5 cm QE 10%, 0.23 s.r. photons per beam particle (mistake: should have been 0.53 for dipole) 25k macroparticles generated per filled bunch SEY parameters: SEY=1.8, Epk = 310 eV 150 steps per bunch length, 300 steps between bunches 11 field calculations during each of 20 bunches Transverse field grid 7x7 spanning +- 3 sigma Field calculation includes beampipe image charges, no contribution from beam Four data sets: e+ & e-(+- 5mm/grid sources), e+(+-0.5mm/grid sources),e+(+-5mm/cloud sources ) Ten runs per data set: zero beam offset, +- X and Y beam offsets, each for both drift and 715 G dipole volumes

3 14 January 2009 e+, Drift volume, Beam Y + 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Beam offset observed in cloud particle energies

4 14 January 2009 e+, Vertical Field, Drift, Beam Y +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden No pinch effect present

5 14 January 2009 e+, Vertical Field, Drift, Beam Y +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Marco found a gradient about 25% larger for this case

6 14 January 2009 e+, Vertical Field, Drift, Beam Y +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Grid Field Sources (21x21) Macroparticle Field Sources

7 14 January 2009 e+, Horizontal Field, Drift, Beam X +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Some pinch effect present

8 14 January 2009 e+, Horizontal Field, Drift, Beam X +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Gradient factor 3 smaller than vertical

9 14 January 2009 e+, Vertical Field, Drift, Beam Y mm ECLOUD Electric Field Calculations/ J.A.Crittenden Some “pinch effect” present

10 14 January 2009 e+, Vertical Field, Drift, Beam Y mm ECLOUD Electric Field Calculations/ J.A.Crittenden Gradient factor 6 larger than for offset +- 5mm (?)

11 14 January 2009 e+, Horizontal Field, Drift, Beam X mm ECLOUD Electric Field Calculations/ J.A.Crittenden Some “pinch effect” present

12 14 January 2009 e+, Horizontal Field, Drift, Beam X mm ECLOUD Electric Field Calculations/ J.A.Crittenden Gradient again factor 6 larger than for offset +- 5mm (?)

13 14 January 2009 e-, Vertical Field, Drift, Beam Y +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden No pinch effect present

14 14 January 2009 e-, Vertical Field, Drift, Beam Y +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Marco found a gradient about 25% larger for this case

15 14 January 2009 e-, Horizontal Field, Drift, Beam X +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden Some pinch effect present

16 14 January 2009 e-, Horizontal Field, Drift, Beam X +- 5 mm ECLOUD Electric Field Calculations/ J.A.Crittenden