Accelerator Physics      

My intial focus concerned space-charge dominated beams: Vlasov-Poisson dynamics, symplectic mapping techniques, new methods for solving beam dynamics equations, and wake field effects. More recently I have been looking at modeling collisions in beams (both "soft" and "hard") as well as beam-beam effects and at error-control and convergence issues in N-body simulations. I am also interested in new techniques for very high gradient particle accelerators, such as laser acceleration. My work is carried out mostly in collaboration with Robert Ryne (LBNL) who I first met in graduate school and with Ji Qiang (LBNL) who was originally a LANL post-doc. Beginning in 1992-93, Rob and I began carrying out some of the very first large-scale beam dynamics simulations on parallel computers and this effort led to a DOE Grand Challenge award in 1997. The scope of our activities then expanded to include electromagnetics and the integration of beam dynamics and electromagnetics solvers (in collaboration with a group led by Kwok Ko at SLAC). In addition, we began working in earnest with framework developers and visualization experts at the Advanced Computing Laboratory (ACL) at Los Alamos. At present my work is supported by a nationwide accelerator modeling and simulation effort in collaboration with several national laboratories and universities funded by DOE's SciDAC initiative. I am trying to bring together beam dynamicists and astrophysicists to pool resources in areas such as the application of adaptive mesh methods, error controls, convergence accceleration, and code verification and validation.

Papers
  1. SciDAC Advances and Applications in Computational Beam Dynamics, R. Ryne, D. Abell, A. Adelmann, J. Amundson, C. Bohn, J. Cary, P. Colella, D. Dechow, V. Decyk, A. Dragt, R. Gerber, S. Habib, D. Higdon, T. Katsouleas, K.L. Ma, P. McCorquodale, D. Mihalcea, C. Mitchell, W. Mori, C.T. Mottershead, F. Neri, I. Pogorelov, J. Qiang, R. Samulyak, D. Serafini, J. Shalf, C. Siegerist, P. Spentzouris, P. Stoltz, B. Terzic, M. Venturini, and P. Walstrom, Proceedings of SciDAC 2005 (San Francisco, June 2005), J. Phys. Conf. Ser. 16, 210 (2005). PDF available here.
  2. The Synthesis of Accelerator Science and Advanced Computing: Developing Extraordinary Tools for Extraordinary Science, R.D. Ryne, A. Adelmann, E. Esarey, D. Grote, A. Friedman, M. Furman, W. Leemans, M. Pivi, Ji Qiang, C. Schroeder, C. Siegerist, B. Shadwick, J.L. Vay, C. Steier, D. Robin, S. Habib, LBNL Report (2002). PDF available here.
  3. Self-Consistent Langevin Simulation of Coulomb Collisions in Charged-Particle Beams, Ji Qiang, Robert D. Ryne, and Salman Habib, Technical Paper, SC2000 (Dallas, November 2000) PDF file from SC2000 website
  4. A Second-Order Stochastic Leap-Frog Algorithm for Langevin Simulation, Ji Qiang and Salman Habib, to appear in Proceedings of the XX International LINAC Conference (Monterey, August 2000) physics/0008196
  5. Computational Challenges in High Intensity Ion Beam Physics, Robert D. Ryne, Ji Qiang, and Salman Habib, Proceedings of the 2nd ICFA Advanced Accelerator Workshop on The Physics of High Brightness Beams (UCLA, November 1999)
  6. Fortran Implementation of Object-Oriented Design in Parallel Beam Dynamics Simulations, Ji Qiang, Robert D. Ryne, and Salman Habib, Comp. Phys. Comm. 133, 18 (2000)
  7. An Object-Oriented Parallel Particle-In-Cell Code for Beam Dynamics Simulation in Linear Accelerators, Ji Qiang, Robert D. Ryne, Salman Habib, and Viktor Decyk, J. Comp. Phys. 163, 434 (2000)
  8. An Object-Oriented Parallel Particle-In-Cell Code for Beam Dynamics Simulation in Linear Accelerators, Ji Qiang, Robert D. Ryne, Salman Habib, and Viktor Decyk, SC99 Technical Paper (Portland, 1999) PDF file from SC99 website
  9. Beam Halo Studies Using a 3-Dimensional Particle-Core Model, Ji Qiang, Robert Ryne, and Salman Habib, Proceedings of the 1999 Particle Accelerator Conference (New York, 1999), edited by A. Luccio and W. MacKay (IEEE, Piscataway, 1999)
  10. Parallel Object-Oriented Design in Fortran for Beam Dynamics Simulations, Ji Qiang, Robert Ryne, and Salman Habib, Proceedings of the 1999 Particle Accelerator Conference (New York, 1999), edited by A. Luccio and W. MacKay (IEEE, Piscataway, 1999)
  11. The US DOE Grand Challenge in Computational Accelerator Physics, Robert D. Ryne, Salman Habib, Ji Qiang, Kwok Ko, Zenghai Li, Brian McCandless, Wanjun Mi, Cho-Kuen Ng, Mikhail Saparov, Vinay Srinivas, Yong Sun, Xiaowei Zhan, Viktor Decyk, and Gene Golub, Proceedings LINAC98 (Chicago, IL 1998)
  12. Object-Oriented Accelerator Design with HPF, Ji Qiang, Robert D. Ryne, and Salman Habib, Proceedings ISCOPE'98 (Santa Fe, NM 1998)
  13. The DOE Grand Challenge in Computational Accelerator Physics, Robert Ryne, Salman Habib, Kwok Ko, Zenghai Li, Cho-Kuen Ng, Ji Qiang, Mikhail Saparov, Vinay Srinivas, Yong Sun, and Xiaowei Zhan, ICNSP'98 extended abstract, Santa Barbara, February 1998 postscript (.5 MB gzipped, 2 MB raw)
  14. Particle beam dynamics simulations using the POOMA Framework, W. Humphrey, R. Ryne, T. Cleland, J. Cummings, S. Habib, G. Mark, and J. Qiang, Lec. Notes Comp. Sci. 1505, 25 (1998)
  15. Modeling Particle Accelerators using C++ and the POOMA Framework, Graham A. Mark, William F. Humphrey, Julian C. Cummings, Timothy J. Cleland, Robert D. Ryne, and Salman Habib, ICNSP'98 extended abstract, Santa Barbara, February 1998 postscript (22 KB gzipped, 52 KB raw)
  16. Parallel Beam Dynamics Calculations on High Performance Computers, Robert Ryne and Salman Habib, AIP Conference Proceedings (no. 391), Williamsburg, Virginia, September 1996 (AIP, 1997) postscript (.5 MB gzipped, 2.2 MB raw)
  17. Beam Dynamics Calculations and Particle Tracking using Massively Parallel Processors, Robert Ryne and Salman Habib, Part. Accl. 55, 365 (1996) postscript (31 KB gzipped, 95 KB raw)
  18. Halos of Intense Proton Beams, Robert D. Ryne, Salman Habib, and Thomas P. Wangler, Proceedings of the 1995 Particle Accelerator Conference, Dallas, Texas, May 1995 (IEEE, New York, 1995)
  19. Recent Results in Analysis and Simulation of Beam Halo, Robert Ryne, Thomas P. Wangler, and Salman Habib, paper based on a presentation at the International Conference on Accelerator Driven Transmutation Technologies and Applications, Las Vegas, Nevada (1994) postscript (1.6 MB gzipped, 5 MB raw)
  20. High Performance Computing for Beam Physics Applications, Robert Ryne and Salman Habib, paper based on a presentation at the Energy Research Power Users Symposium, Rockville, MD (1994)postscript (.5 MB gzipped, 1.4 MB raw)
Related Links

T-Division Research Highlights for 2005: Taming and Accelerating Particle-In-Cell [PDF].
Advanced Computing for 21st Century Accelerator Science & Technology SciDAC project home page.
Computational Accelerator Physics Grand Challenge home page.
The Virtual Library of Accelerator Physics at SLAC.
The Accelerator Physics page maintained by LAACG (Los Alamos Accelerator Code Group) at LANL.

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Salman Habib / LANL / revised March 2005
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