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BNL trip

Goal of the BNL-FERMILAB-CERN collaboration The codes BB tune foot-prints DA studies. BNL trip. Goal of the BNL-FERMILAB-CERN Collaboration. Benchmaking of the codes Lifetrac SixTrack SimTrack DA and Tune foot-prints in view of BB. The Codes I. Lifetrac (Fermilab)

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BNL trip

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  1. Goal of the BNL-FERMILAB-CERN collaboration • The codes • BB tune foot-prints • DA studies BNL trip

  2. Goal of the BNL-FERMILAB-CERN Collaboration Benchmaking of the codes Lifetrac SixTrack SimTrack DA and Tune foot-prints in view of BB

  3. The Codes I Lifetrac (Fermilab) Weak-strong BB code (e-p colliders 1995) Non-equilibrium distributions (2003-2004)conventional macro particle tracking code Machine lattice 6D map + thin multipoles Beta-functions from MAD-X TWISS Thin multipoles from MAD-X RF sinusoidal kick First and second order chromaticity via additional deltap phase advance and “chromatic drifts” before and after IP. 6D Hirata of sliced head-on, parasitic are thin Introduction of noise once per kick 10’000 particles 1e6-1e7 turns  better beam emittance and lifetime: Averaging density distribution over simulation step (10’000 turns) Weighted distribution with more particles in the tails MPI with non-interacting nodes

  4. The Codes II Sixtrack Traditional single particle element-by element code Extended Hamiltonian (bad for extremely large deltap) Symplectic treatment of thin and thick (second order) elements  full Ripken theory 6D extended Hirata BB formalism (Ripken) Full differential algebra and NormalForm implementation a pre-PTC approach Optimized for speed Elaborate run environment for massive tracking runs

  5. The Codes III SimTrack (BNL) C++ library 4th order symplectic integrator 4d and 6d BB Benchmark Tracy II and BBSIM Many elements Parameter change on the fly RHIC Au run and BB head-on compensation Particle loss emittance growth & lifetime Linked to Mathematica: SVD, polynominal fitting etc.

  6. The Codes IV (issues) Lifetrac How well can the lattice approximation work compared to the real thing? No tune foot-print available (work in progress) Sixtrack The thick lens part is presently not fully operational but can be easily replaced by going to thin mode No plans for emittance growth nor lifetime SimTrack Thinlens lattice not fully readable No BB crossing angle implemented  Compare Lifetrac and SixTrack for LHC case Tune foor-prints for RHIC

  7. Conclusions The approximations of Lifetrac are not that bad Tune foot-prints from Lifetrac are highly desirable and will come Lattice and NL are reasonably well represented to trust lifetime and emittance growth (of course has to be tested separately) SimTrack agrees well concerning tune foot-print but longterm tracking needed to check reliabilty Experiments sorely missed!

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