RF Modeling Plans for the European Spallation Source

Stephen Molloy, Mats Lindroos, Steve Peggs, Rob Ainsworth, R.J.M.Y Ruber

Research output: Contribution to conferencePaper


The European Spallation Source (ESS) will be the world's most powerful next generation neutron source. The ESS linac is designed to accelerate highly charged bunches of protons to a final energy of 2.5 GeV, with a design beam power of 5 MW, for collision with a target used to produce the high neutron flux. In order to achieve this several stages of RF acceleration are required, each using a different technology. The high beam current and power require a high degree of control of the accelerating RF, and the specification that no more than 1 W/m of losses will be experienced means that the excitation and decay of the HOMs must be very well understood. Experience at other high power machines also implies that an understanding of the generation and subsequent trajectories of any field-emitted electrons should be understood. Thermal detuning of the HOM couplers due to multipacting is a serious concern here. This paper will outline the RF modeling plans - including the construction of mathematical models, simulations of HOMs, and multipacting - during the current Accelerator Design Update phase, and will discuss several of the more important issues for ESS.
Original languageEnglish
Publication statusPublished - 2011
EventIPAC11 - San Sebastian, Spain
Duration: 4 Sept 2011 → …


CitySan Sebastian
Period4/09/11 → …

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