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45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of 19-20 December.

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Presentation on theme: "45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of 19-20 December."— Presentation transcript:

1 45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of 19-20 December 2009 Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Meeting 6 January 2010 10-, 20-, 45-bunch trains with 34 mA total current 4-, 8-, 12-ns bunch spacing Includes comparison to June 2009 measurements with 4-ns spacing for which POSINST calculations are available 13 Jan 2010: Added comparison to December 2009 measurements with 4-ns spacing

2 6 January 2010 ECLOUD Simulations for Measurements of 19-20 December 2009 / J.A.Crittenden 2/6 ECLOUD Simulations for Measurements of 10 June 2009 CTA_2085MEV_20090516, 32-bunch train, 4-ns spacing, 0.8 mA/bunch Black: Horizontal tune shifts e+ 1.3x10 10 /bunch, 2.1 GeV Red: nominal simulation parameters (SEY=2.0) Blue: SEY=2.2 The POSINST and ECLOUD field gradient calculations are consistent with each other. Each underestimates the horizontal tune shift. POSINST (Gerry) Electron cloud meeting 6/17/2009 ECLOUD

3 6 January 2010 ECLOUD Simulations for Measurements of 19-20 December 2009 / J.A.Crittenden 3/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_20090516, 4-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch Remarkable variety in positron tune shifts. Electron tune shifts negligible.

4 6 January 2010 ECLOUD Simulations for Measurements of 19-20 December 2009 / J.A.Crittenden 4/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_20090516, 8-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch Remarkable variety in positron tune shifts also for 8-ns spacing, including sign change.

5 6 January 2010 ECLOUD Simulations for Measurements of 19-20 December 2009 / J.A.Crittenden 5/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_20090516, 12-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch The results for 12-ns spacing give information on how the 14-ns data is likely to behave.

6 6 January 2010 ECLOUD Simulations for Measurements of 19-20 December 2009 / J.A.Crittenden 6/6 ECLOUD Simulations for Measurements of 19 December 2009 CTA_2085MEV_20090516, 4-ns spacing, 45 mA total current Compare to 45-bunch, 4-ns spacing, 0.75 mA/bunch measurements of December 2009 New record for horizontal tune shift: 25 kHz ! ECLOUD factor two underestimate for D Q x similar to that observed for the June 2009 measurements for both ECLOUD and POSINST. Apparently no vertical excitation of the beam, so no vertical tune measurement.

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