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Paul, K.

Paper Title Page
TUIOC02 Simulations of the Modulator, FEL Amplifier and Kicker for Coherent Electron Cooling of 40 GeV/n Au+79  
 
  • D. L. Bruhwiler, G. I. Bell, K. Paul, I. V. Pogorelov, B. T. Schwartz
    Tech-X, Boulder, Colorado
  • Y. Hao, V. Litvinenko, G. Wang
    BNL, Upton, Long Island, New York
  • S. Reiche
    PSI, Villigen
  
  Increasing the luminosity of hadron beams in particle accelerators is critical for the advancement of nuclear and particle physics. Coherent electron cooling (CeC) promises to cool relativistic hadron beams significantly faster than alternative methods.* We present simulations of 40 GeV/n Au+79 ions for a single pass through a CeC system, which consists of a modulator, a free-electron laser (FEL) amplifier and a kicker. In the modulator, the electron beam copropagates with the ion beam, which perturbs the electron beam density and velocity via anisotropic Debye shielding. Self-amplified spontaneous emission lasing in the FEL both amplifies and imparts wavelength-scale modulation on the electron beam perturbations. The modulated electric fields appropriately accelerate or decelerate the copropagating ions in the kicker. In analogy with stochastic cooling, these field strengths are crucial for estimating the effective drag force on the hadrons and, hence, the expected cooling time. The inherently 3D particle and field dynamics is modeled with the parallel VORPAL framework (modulator and kicker) and with GENESIS (amplifier), with careful coupling between codes. Physical parameters are taken from the CeC proof-of-principle experiment that is being designed at BNL.

* Litvinenko & Derbenev, "Coherent Electron Cooling," PRL (2009).

 
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