Hello, A change in allocation has been requested: Requester: borland (Michael Borland) Project: ApsRenewalLattice Title: Lattice Development and Beam Dynamics for APS Upgrade Description: APS has developed a method of using multi-objective genetic algorithms (MOGA) for optimization of accelerator lattices. In past years, this method has been applied successfully using blues, fusion, intrepid, and a small APS cluster to development and evaluation of lattices for the APS Upgrade. In the coming year, we will contniue working on a multi-bend achromat (MBA) lattice design that promises to push APS x-ray brightness to world-leading levels. Significant progress has already been made developing a design that is consistent with engineering constraints. The design has been presented at external reviews related to the on-going upgrade project. Our approach is to create a series of lattices that gradually push performance up while simultaneously incorporating on-going constraints derived from on-going interactions with magnet and vacuum system designers. As such, the process is naturally iterative, and we have completed a series of iterations to date to conform to engineering limits. Further iterations are on-going, with interest in reducing cost also being relevant. In addition to MOGA, we must perform ensemble evaluation to assess the robustness of solutions, understand magnet quality requirements, and evaluate effects of insertion devices on the newly-developed solutions. Finalization of the lattice design and preparation of the preliminary design report is anticipated in FY16. The codes being used for MOGA and ensemble evaluation have all been used in past years on fusion. These include Pelegant, a parallel accelerator simulation code used primarily for particle tracking and acceptance determination, as well as a Tcl script used for genetic optimization. The simulations are close to embarrassingly parallel and thus scale very well. In addition to lattice development, we model the effects of the higher harmonic cavity (HHC), which plays a vital role in increasing the beam lifetime and reducing emittance blow-up. The simulations involve tracking beams consisting of 48 or more bunches of 100,000 or more particles each, and computing the collective electromagnetic interaction of these particles with the vacuum chamber and rf cavities. The methods are well advanced and will be employed with new lattices as they are generated. Beam loss analysis began in FY15 and will continue in FY16. This involves detailed and time-intensive simulation of the injection process and the Touschek scattering process. It also involves evaluation of beam loss collimation schemes, which are needed in order to protect accelerator components and reduce radiation outside the shielding wall. Current: undetermined amount Justification: The primary code being used, ELEGANT, has run successfully on fusion, blues, intrepid, mira, and other systems. Most simulations are close to embarrassingly parallel, since they are of single-particle dynamics only. Simulations with collective effects show greater than 70% efficiency for 256 or more cores, depending on problem details. Requested: 2000000 A specific reason has been given: Have used the previous allocation for high-demand APS-upgrade work. Continue to need significant resources due to schedule demands of the APS upgrade. Collective effects modeling in particular is proving very demanding. This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System