Paper  Title  Page 

WEOCKI03  Status of the R&D Towards Electron Cooling of RHIC  1938 


Funding: Work done under the auspices of the US DOE with support from the US DOD. The physics interest in a luminosity upgrade of RHIC requires the development of a coolingfrontier facility. Detailed cooling calculations have been made to determine the efficacy of electron cooling of the stored RHIC beams. This has been followed by beam dynamics simulations to establish the feasibility of creating the necessary electron beam. Electron cooling of RHIC at collisions requires electron beam energy up to about 54 MeV at an average current of between 50 to 100 mA and a particularly bright electron beam. The accelerator chosen to generate this electron beam is a superconducting Energy Recovery Linac (ERL) with a superconducting RF gun with a laserphotocathode. An intensive experimental R&D program engages the various elements of the accelerator: Photocathodes of novel design, superconducting RF electron gun of a particularly high current and low emittance, a very highcurrent ERL cavity and a demonstration ERL using these components. 

Slides  
THPAS015  ThreeDimensional Integrated Green Functions for the Poisson Equation  3546 


Funding: Supported by US DOE Office of Science: Offices of Nuclear Physics, grant DEFG0203ER83796; High Energy Physics; and Advanced Scientific Computing Research, SciDAC Accelerator Science and Technology. The standard implementation of using FFTs to solve the Poisson equation with open boundary conditions on a Cartesian grid loses accuracy when the change in G rho (the product of the Green function and the charge density) over a mesh cell becomes nonlinear; this is commonly encountered in high aspect ratio situations and results in poor efficiency due to the need for a very large number of grid points. A modification which solves this problem, the integrated Green function (IGF), has been implemented in two dimensions using linear basis functions and in three dimensions using constant basis functions. But, until recently, it has proved to be very difficult to implement IGF in three dimensions using linear basis functions. Recently significant progress has been made. We present both the implementation and test results for the threedimensional extension. 

THPAS019  A Beam Dynamics Application Based on the Common Component Architecture  3552 


Funding: Department of Engergy, Office of Advanced Scientific Computing Research, SBIR grant: DEFG0206ER84520 A componentbased beam dynamics application for modeling collective effects in particle accelerators has been developed. The Common Component Architecture (CCA) software infrastructure was used to compose a new Pythonsteered accelerator simulation from a set of services provided by two separate beam dynamics packages (Synergia and MaryLie/Impact) and two highperformance computer science packages (PETSc and FFTW). The development of the proofofconcept application was accomplished via the following tasks:


FRPMS032  HighOrder Modeling of an ERL for Electron Cooling in the RHIC Luminosity Upgrade using MaryLie/IMPACT  4000 


Funding: Work supported by the U. S. DOE Office of Science, Office of Nuclear Physics under grant DEFG0203ER83796. Plans for the RHIC luminosity upgrade call for an electron cooling system that will place substantial demands on the energy, current, brightness, and beam quality of the electron beam. In particular, the requirements demand a new level of fidelity in beam dynamics simulations. New developments in MaryLie/IMPACT have improved the spacecharge computations for beams with large aspect ratios and the beam dynamic computations for rf cavities. We present the results of beam dynamics simulations that include the effects of space charge and nonlinearities, and aim to assess the tolerance for errors and nonlinearities on current designs for a superconducting ERL. 