Abstract
Higher order modes (HOMs) can severely limit the operation of superconducting cavities in a linear accelerator with high beam current, high duty factor, and complex pulse structure. The full HOM spectrum has to be analyzed in order to identify potentially dangerous modes already during the design phase and to define their damping requirements. For this purpose a dedicated beam simulation code simulation of higher order mode dynamics (SMD) focused on beam-HOM interaction was developed, taking into account important effects like the HOM frequency spread, beam input jitter, different chopping patterns, as well as klystron and alignment errors. Here, SMD is used to investigate the influence of HOMs in detail in the superconducting proton linac at CERN and their potential to drive beam instabilities in the longitudinal and transverse plane.
Highlights
The superconducting proton linac (SPL) [1,2,3] is conceived as a 4 MW high power superconducting linac in pulsed operation, as driver for a neutrino or a radioactive ion beam facility
The transverse focusing is done in the SPL by one quadrupole doublet per focusing period
In [8] the implementation of the beam-Higher order modes (HOMs) interaction used in simulation of higher order mode dynamics (SMD) is described in detail
Summary
The superconducting proton linac (SPL) [1,2,3] is conceived as a 4 MW high power superconducting linac in pulsed operation, as driver for a neutrino or a radioactive ion beam facility It accelerates HÀ from 160 MeV up to 5 GeV using two families ( g 1⁄4 0:65 and g 1⁄4 1:0) of five cell superconducting elliptical -mode cavities, operating at 704.4 MHz. A pulse length of 1 ms is foreseen with an average pulse current up to 40 mA and a repetition rate of 50 Hz. All basic design parameters of the linac and the cavities used in this study are listed in Tables I and II. In this paper the code simulation of higher order mode dynamics (SMD) [15] is introduced, which is developed to simulate the HOM-beam interaction in the longitudinal. Based on the simulation results, HOM damping requirements for different operation modes will be defined
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