Abstract
Results of the beam dynamics simulation in a linear accelerator at full energy 1.5 – 2.0 GeV for an international project – CERN Future Circular Collider (FCCee) are presented. FCC is developing designs for a higher performance particle collider to extend the research currently being conducted at the Large Hadron Collider, once the latter reaches the end of its lifespan. Beam dynamics simulations done using BEAMDULAC-BL code developed in NRNU MEPhI. This code allows taking into account both the quasistatic and high-frequency self-field components.
Highlights
The Future Circullar Collider (FCC) is the one of the most prospective and ambitious projects of future [Abada, 2019 EPJ C; Abada, 2019 EPJ ST 228(2); Abada, 2019 EPJ ST 228(4); Abada, 2019 EPJ ST 228(5)]
The beam dynamics simulations were done at NRNU MEPhI [Bondarenko et al, 2016; Bondarenko et al, 2017] using BEAMDULAC-BL code developed at MEPhI [Masunov et al, 2006; Masunov et al, 2008; Masunov et al, 2010; Bondarenko et al, 2013; Polozov, 2018]
The main remarks can be done after simulations: (1) Beam dynamics, including capturing, Coulomb repulsion, head-tail effects, energy spread are defined by the bunch charge and by the initial phase-energy distribution; (2) as it can be seen in Figures 3-5, KapchinskyVladimirsky (KV) initial phase distribution give better results compared to normal one; (3) the field distribution in the first accelerating cells play the key role in bunch formation and, further, to capturing coefficient and energy spread; (4) it should be noted that 1000 kV/cm give no preferences for beam dynamics compared to 800 kV/cm; 3 Photogun Beam Dynamics
Summary
The Future Circullar Collider (FCC) is the one of the most prospective and ambitious projects of future [Abada, 2019 EPJ C; Abada, 2019 EPJ ST 228(2); Abada, 2019 EPJ ST 228(4); Abada, 2019 EPJ ST 228(5)]. The current transmission coefficient is close to 100 % and RF field amplitude of 600 kV/cm is quite enough to have 10.5 MeV after photogun Such energy is necessary for effective recapturing by the second section, as it was presented at FCC Meeting 2016. Head-tail difference of RF field amplitude due to high bunch phase size and beam loading effect leads to energy spectrum growth. IV) One interesting effect was observed for high intensity bunches: beam spectrum and capturing coefficient are sufficiently dependent on initial bunch phase distribution. Here we should note, that energy spectrum for thermionic guns is defined by Coulomb repulsion but by phase velocities and RF field amplitudes in first 2-4 cells where electron velocities are sufficiently less than 1. The optimal injection energy for RF-gun with thermocathode is 100 keV
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