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: The software and methods used in this project are an evolution of those used in prior years on fusion, intrepid, and small clusters at APS. The software is highly scalable as the core genetic algorithm is embarrassingly parallel. Recently, an improved approach to using genetic optimization to optimize accelerator lattices was developed, which involves a sub-optimization to tune several 10's of linear optics parameters, in addition to the main optimization of sextupole strengths. This produced a breakthrough for the difficult Reduced Horizontal Beamsize (RHB) insertion, while simultaneously improving its deliverable (from 100 microns to less than 80). We now need to apply this technique to optimization of the RHB with the other APS-U lattice components. This will require about 250k core hours. In addition, it was recently discovered that the SPX system has unexpected effects on beam lifetime. Thus, we need to reoptimize sextupoles for this system in order to simultaneously tune out the vertical emittance increase while obtaining good lifetime and dynamic aperture. This is somewhat new territory and core hour requirements are difficult to estimate. We've simply doubled the time we would usually expect, giving 300k core hours. Other SPX-related beam dynamics tasks, such as multi-particle tracking to investigate instability limits, will be undertaken as time permits. Project URL: Current FY Hours Used: undetermined amount New FY Requested allocation: 650 Q1: 300 Q2: 200 Q3: 100 Q4: 50 Justification: The genetic algorithm used in this work is highly scalable, as it is embarrassingly parallel. N 8-core jobs run independently, coordinated by a script running on a login node. We recently used ~40k core-hours/week, limited only by allocation and availability of nodes. Thank You, The LCRC Accounts System