Progress Report on UCLC Simulations at Cornell Presenter David Sagan

							Progress Report on
 UCLC Simulations
    at Cornell

   Presenter: David Sagan


                January 7, 2004   David Sagan   -1-
                         Project

Work done as part of the UCLC R&D for a linear collider.

Reference:
     “Beam simulation: main beam transport in the
     LINACs and beam delivery systems, beam halo
     modeling and transport, and implementation as a
     diagnostic tool for commissioning and operation.”
     G. Dugan, et. al
     http://www.lns.cornell.edu/public/LC/UCLC/projects.html




                                   January 7, 2004   David Sagan   -2-
          Collaborators


Gerry Dugan                      Joe Rogers
Laura Fields                     David Rubin
Lawrence Gibbons                 David Sagan
Hanna Mahike-Krueger             Jeff Smith
Mark Palmer                      Jeremy Urban
Ritchie Patterson




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                          Bmad

The main simulation tool used at Cornell is the Bmad
subroutine library (written in Fortran90) for simulations of
relativistic charged-particle dynamics.

Bmad was developed to provide a flexible and
powerful platform for code development.

Bmad helps to:
  • Cut down on the time needed to develop programs.
  • Minimize computation times.
  • Cut down on programming errors.

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                 Bmad Features

Bmad features include:
 • MAD-like lattice file input format.
 • Full set of element types:
    Quadrupole, Sextupole, Solenoid, Sol_Quad,
    Wiggler, BeamBeam, Sbend, Kicker, Taylor, etc…
 • Routines for:
    transfer matrices, Twiss parameters, particle tracking,
    Runge-Kutta integration, radiation damping and excitation,
    symplectic integration, Taylor maps, radiation integrals, etc…

 • Easy simulation of “Control Room knobs”.

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                Recent Progress
Bmad has been extended for LINAC simulation:
 • Macroparticle tracking implemented
         - Full 6 x 6 sigma matrices
         - Ability to track through bends
 • LCavity element with wakefields implemented.
 • XSIF (Extended Standard Input Format) parser implemented.
 • I_Beam element implemented*
 • Initial comparison with LIAR shows agreement.
Other progress:
 • Bmad Documentation [http://www.lepp.cornell.edu/~dcs].
 • Fortran to C structure conversion standard (Fortran2003).

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            Future Simulations

• Explore the effects of guide field and RF errors on beam size
  and trajectory.
• Explore the current dependence of beam size and trajectory due
  to wakes.
• Simulate the measurement of trajectories, phases, and coupling.
  Develop algorithms for finding and correcting errors.
• Use the simulation to explore commissioning strategies, (using
  beam based measurements to steer beam down the length of the
  LINAC and then to eliminate errors.
• Simulate the effectiveness of feedback to compensate for
  ground motion, etc.
• Include a beambeam simulation (Guinea Pig?) for a complete
  simulation from injector to to detector.

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