M. Pivi PAC09 Vancouver, Canada 4-8 May 2009

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Presentation transcript:

M. Pivi PAC09 Vancouver, Canada 4-8 May 2009 (Extracted from recent talk presented at PAC09: “Detailed Electron Cloud Modeling Using CMAD”) M. Pivi PAC09 Vancouver, Canada 4-8 May 2009 4-8 May, 2009 PAC Vancouver, Canada, 2009

CMAD Simulation code Tracking the beam (x,x’,y,y’,z,d) in a MAD lattice by 1st order and 2nd (2nd order switch on/off) transport maps MAD8 or X “sectormap” and “optics” files as input Apply beam-cloud interaction point (IP) at each ring element Parallel bunch-slices based decomposition to achieve perfect load balance Beam and cloud represented by macroparticles Particle in cell PIC code 9-point charge deposition scheme

Simulation code 3D electron cloud dynamics Leap-Frog with Boris-rotation including magnetic fields 2D Beam-Cloud forces – FFT O(N log(N)) open space and conducting boundary Define at input a cloud density level [0<r<1] for each magnetic element type

Major Parameter A. Wolski, M. Korostelev

ILC DR Structure and layout A. Wolski, M. Korostelev

Magnet counts and Parameters A. Wolski, M. Korostelev

ILC DR flat beams [1] Y. Cai etal PRSTAB 4, 011001 (2001). To minimize the truncation errors in our simulation with flat beams [1], we select >> more mesh points in the horizontal direction compared to the vertical one so that at least grid size Hx ~ 10 Hy. Example in case of sx/sy = 150:1, we use a transv. grid 300x20. [1] Y. Cai etal PRSTAB 4, 011001 (2001).

DR Simulations Tracking the beam and applying beam-cloud kicks everywhere except magnetic-free: assume e-cloud in field free Drift regions is mitigated. Note high synchrotron tune 0.038. Horizontal emittance small increase In the case 8e11, also beam losses of 40%

DR Simulations Incoherent emittance blow-up below threshold: Next: include radiation damping and quantum excitations …

Summary Benchmarking (not shown here) for single-bunch instability codes looks from good to excellent. Confirmation of incoherent emittance blow-up below threshold Setting up for longer simulations at lower cloud density Include radiation damping and quantum excitation Instability threshold for ILC DR new lattice is at cloud density about ~4-8e11 m-3. Next: benchmarking CesrTA Next: compare e- cloud instability in the three DR options 72/90/100 degree phase advance