Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Michael Borland Project Name: ApsRenewalLattice Division: ASD Project title: Lattice Development and Beam Dynamics for APS Upgrade Associated funding: Department of Energy,Office of Science, Office of Basic Energy Sciences Other Systems: ASD "weed" cluster, operated by ASD/AOP group. weed has 56 Nehelem processors with a lustre filesystem and infiniband network. I typically have access to about 50% of the cluster full time. Science: As part of the APS Renewal, the accelerator lattice (the location and powering of the magnets) will be modified to incorporate a number of long straight sections for insertion devices and other purposes, such as Short-Pulse X-rays (SPX). This involves breaking the symmetry of the ring, which has serious implications for particle stability. Using simulation-based techniques developed at APS, we can tune the nonlinear elements to improve the dynamic and momentum aperture. Rapid turn-around is essential in order to respond to requests from the APS user community for evaluation of new options. In addition, simulations related to SPX beam dynamics will be performed, since this complex, unique system has the potential to affect the beam in undesirable ways. Project 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 fusion, intrepid, and a small APS cluster to development and evaluation of lattices for the APS Upgrade. In the coming year, we will perform detailed evaluation of configurations leading up to the CD2 review. This will primarily consist of detailed multiparticle tracking simulations for the short-pulse x-ray (SPX) system. These simulations will confirm expected performance and tolerances. Beyond that, we will refine the configurations and respond to requests for changes. For example, we will look at the possibility of reoptimizing SPX to use a lower rf frequency. Another configuration that may be explored is the possibility of beta-function manipulation to enhance the performance of SPX. The codes being used 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. Project URL: Current FY Hours Used: undetermined amount New FY Requested allocation: 450000 Q1: 150000 Q2: 100000 Q3: 100000 Q4: 100000 Justification: These codes have been used in past years on fusion, intrepid, and the APS weed cluster and show excellent scaling. The basic simulations involve single particle beam dynamics, which is close to embarrassingly parallel. In addition, the genetic algorithm script does little more than manage jobs in the batch queue. Thank You, The LCRC Accounts System