45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Preliminary Results on the Introduction of the Rediffused SEY Component.

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Presentation transcript:

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Preliminary Results on the Introduction of the Rediffused SEY Component in ECLOUD Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting 2 September 2009

23 September 2009 Preliminary Results from the Introduction of the Rediffused SEY Component in ECLOUD / J.A.Crittenden 2/6 See also slides presented on 22 April 2009 in preparation for PAC 2009 and the followup on 20 May 2009 Figure 3 of Studies of the Effects of Electron Cloud Formation at CESRTA PAC 2009 J.A.Crittenden, J.Calvey, G.Dugan, D. L.Kreinick, J. A.Livezey, M.A.Palmer, D.L.Rubin (Cornell), K.C.Harkay (ANL), R.L.Holtzapple (CalPoly), K.Ohmi (KEK), M.Furman, G.Penn, M.Venturini (LBNL), M.T.F. Pivi, L.Wang (SLAC) Problems with ECLOUD tune shift calculation for long bunch trains

23 September 2009 Preliminary Results from the Introduction of the Rediffused SEY Component in ECLOUD / J.A.Crittenden 3/6 Relative Drift and Dipole Contributions Fluctuations set in for late bunches in long trains in dipole regions. Frank suggested testing numerical approximations. Time step size, field calculation frequency – no help (see 20 May). Problem resolved by increasing number and reducing charge of macroparticles (see 2 Sep).

23 September 2009 Preliminary Results from the Introduction of the Rediffused SEY Component in ECLOUD / J.A.Crittenden 4/6 Replacement for figure 3 following resolution of the fluctuation problem Next step: Does POSINST exhibit a similar problem if the rediffused component is removed?

23 September 2009 Preliminary Results from the Introduction of the Rediffused SEY Component in ECLOUD / J.A.Crittenden 5/6 Compare ECLOUD Result to POSINST with Rediffused SEY Component Removed YES ! And very precisely. ( See D.L.Kreinick talk of 9 Sep) Physics lesson: Long bunch trains (>20) are sensitive to cloud energy spectrum/SEY curve near E peak /multipacting ECLOUDPOSINST without rediffused SEY component

23 September 2009 Preliminary Results from the Introduction of the Rediffused SEY Component in ECLOUD / J.A.Crittenden 6/6 Substantial modification of ECLOUD SEY routines finished yesterday. Removed redundant code, etc. YES ! And very precisely. ( See D.L.Kreinick talk of 9 Sep) Physics lesson: Long bunch trains (>20) are sensitive to cloud energy spectrum/SEY curve near E peak /multipacting ECLOUD Furman & Pivi LBNL d rediffused = P red * (1d0-dexp(-exparg)) * (1.d0+0.26d0*(1- costheta**2))