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Sidorin, A.O.

Paper Title Page
MOPD09 IBS for Non-Gaussian Distributions 62
  • A.V. Fedotov
    BNL, Upton, Long Island, New York
  • A.O. Sidorin, A.V. Smirnov
    JINR, Dubna, Moscow Region

Standard models of the intra-beam scattering (IBS) are based on the growth of the rms beam parameters for a Gaussian beam distribution. However, in many situations distribution can significantly deviate from Gaussian which requires accurate treatment of IBS. Our original interest in this problem was motivated for the need to have accurate description of beam evolution due to IBS while distribution is strongly affected by external electron cooling force [1]. A variety of models with various degrees of approximation were implemented in BETACOOL in the past to address this topic [2]. A more complete treatment based on the friction coefficient and full 3-D diffusion tensor was introduced in BETACOOL at the end of 2007 under the name “local IBS” [3]. Such a model allowed us calculation of IBS for arbitrary beam distributions. Numerical benchmarking of this local IBS model and its comparison with other models was reported before. Here, after briefly describing the model and its limitations, we present its comparison with available experimental data.

[1] A. Fedotov et al., Proc. of PAC05 (Knoxville, TN), p. 4263.
[2] http://betacool.jinr.ru; A. Sidorin et al., NIM A 558, p. 325 (2006).
[3] BNL BETACOOL development report, December 2007.