ElectronsdFud Simulation Work at Cornell Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

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Presentation transcript:

ElectronsdFud Simulation Work at Cornell Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education

2 13 May 2008 CesrTA Collaboration WebEx / J.A.Crittenden ECLOUD program V3.2 (2D, developed at CERN ) –Adapted to CesrTA machine studies experiments –CESR-c tune shift measurements 2007 –CesrTA North Area Triple-RFA arrangement –Continued development (output info, graphics, field calculations) Standalone RFA modeling (Previously MatLab, now F90) –Compute expected RFA currents incl. tracking & secondary generation Vector Fields OPERA model for RFA detectors –Includes electrostatics calculation with B field superposed –Calculates electron trajectories (no energy loss, no secondaries) –Electric field map provided to local standalone development POSINST and CLOUDLAND ramping up –Visit to SLAC this week Overview

3 13 May 2008 CesrTA Collaboration WebEx / J.A.Crittenden CESR-c Tune Measurements Train of ten 1.9 GeV, 0.75 mA positron bunches generates the electron cloud Measure tune shift and beamsize for witness bunches at various spacings Beam-pipe shape 4.5 x 2.5 cm elliptical B-field Field-free rather than 800 G % reflected s.r. photons Less than 20-30% 3000 V/m 2 for 840 kHz ECLOUD points to parameters critical for determining tune shifts: Successfully predicts magnitude of vertical tune shift, but predicted horizontal tune shift is too high. Further investigation of E-field calculation underway.

4 13 May 2008 CesrTA Collaboration WebEx / J.A.Crittenden North Area RFA's Two APS-type RFA's One CESR-design thin RFA Now using electron beam owing to occlusion of e + sr photons North Area RFA Setup 3.5-inch round beampipe 5.3 GeV electron beam Flexible bunch pattern Now investigating energy spectrum and azimuthal dependence Presently no way to calculate optics distortions in CESR lattice Collaboration welcome

5 13 May 2008 CesrTA Collaboration WebEx / J.A.Crittenden OPERA 3D RFA Model RFA Wiggler Vacuum Chamber CesrTA will measure electron cloud charge buildup in both dipole and wiggler magnets The Vector Fields OPERA package used to design the CESR- c superconducting wigglers (c.f. PAC2003/2005) now serving as baseline for the ILC DR wigglers has been used to model the field shaping in the RFA detectors. Tracking in the RFA electric field with an arbitrary superposed magnetic field is possible. Secondary emission in the RFA cannot be modeled in this approach. Focusing effect of the RFA grid holes The transmission for electrons is greater than the optical transmission, and depends on the energy spectrum. Detailed modeling of the grid holes The sophisticated 3D finite-element mesh algorithm allows calculation of subtle effects in the RFA geometry. An exaggerated example of the effect of etching the grid holes is shown here.