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Report of the SC working group

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  1. Report of the SC working group 19.02.2014 SC working group

  2. Miscellaneous • Elena and Hannes are replacing Frank during his absence for chairing the SC meeting and writing the minutes • Series of “Educational talks” • Tunes modulation in a space charge dominated beam: the particles behavior in the "necktie” (Vincenzo) • Phase advance and tunes in 5D&6D (Frank) • Symplectic integrators (Adrian) • Computational resources • original idea of Bernd to integrate special machines with 48 cores into the LSF cluster for the SC simulations is not feasible • Instead we need to request a doubling of our computer resources with a lead time of 2-3 weeks before the peak load of simulations will be needed • Preparation of SC collaboration meeting in May 2014 well on track • draft program is finished; many collaborators already confirmed their participation

  3. Share Point site (Elena)

  4. Recent highlights of ongoing studies • bug in PTC-ORBIT causing the spikes in PSB simulations • resolved by the PSB team with the help of Harry • related to the longitudinal phase space treatment of PTC (stable phase) and the 2.5D space charge module of ORBIT. • A fix of the problem was prepared and the changes to the code have been agreed by the ORBIT developers  new version of ORBIT-PTC compiled and ready for use • Continuation of tune evolution studies for particles under the SC force (Vincenzo) • Started to discuss the latest results in the last SC meeting • Comparison of the phase advance per turn (‘instantaneous tune’) with the average phase advance along a full synchrotron period

  5. MADX frozen space charge (Frank) • Scalar speed optimized  - HR • Lost particles were not taken care of - KwangminBNL • Non-reproducible results found at CERN - FS & HR; Problem has been a critical sum. Remedies: • Take summing out of OPENMP (cost to speed-up remains small) - KwangminBNL • Optimize summation à la Kahan summation algorithm – FS • Critical failure due to subroutine call within OPENMP loop • solved by  taking out the OPENMP - FS & Kwangmin • loss in speed-up small. • Speed-up of TWISS checked but not efficient – Kwangmin • Introducing error function from SixTrack - GA Erskine, E. Mcintosh & FS • Speed-up about 25%. • Final checking of speed-up and code consistency at CERN - HR, E. Mcintosh & FS • New revision of manual; writing up the OPENMP experience • Integration into main MAD-X release - FS & Laurent Deniau

  6. Work programs and list of MDs for the PSB, PS and SPS as can be found on the SC website …

  7. PSB

  8. PSB

  9. PS • Present focus • studies of 4th order resonance (Raymond) • Simulations with MADX frozen space charge (Frank and Raymond) • Detailed list of MDs planned for 2014 in preparation

  10. SPS

  11. SPS