SLAC, Menlo Park, California, USA
Track3P is the particle tracking module of ACE3P, a 3D parallel finite element electromagnetic code suite developed at SLAC which has been implemented on the US DOE supercomputers at NERSC to simulate large-scale complex accelerator designs. Using the higher-order cavity fields generated by ACE3P codes, Track3P has been used for analyzing multipacting (MP) in accelerator cavities. The prediction of the MP barriers in the ICHIRO cavity at KEK was the first Track3P benchmark against measurements. Using a large number of processors, Track3P can scan through the field gradient and cavity surface efficiently, and its comprehensive postprocessing tool allows the identifications of both the hard and soft MP barriers and the locations of MP activities. Results from applications of this high performance simulation capability to accelerators such as the Quarter Wave Resonator for FRIB, the 704 MHz SRF gun cavity for BNL ERL and the Muon cooling cavity for Muon Collider will be presented.
MOSDC3
SLAC, Menlo Park, California, USA
Spurious oscillations remain one of the challenges in the development of high-power klystrons which prevent the tube from reaching the design performance. ACE3P is a parallel electromagnetic code suite comprising Omega3P which computes the eigenmodes of open cavities and Track3P which calculates the particle trajectory in the cavity fields. The oscillation condition is determined by the total Q of the mode which is the sum of the external Q from Omega3P and the beam loaded Q due to energy gain or loss computed with Track3P. With massively parallel computing it is possible to perform an exhaustive search of unstable modes in a given klystron from the gun to the collector on a time scale much shorter than existing tools. Application to the XC8 and LBSK klystrons at SLAC will be presented.
THP01
SLAC, Menlo Park, California, USA
Based on the conformal higher finite-element method implemented on parallel computing platforms, ACE3P is extending its capabilities to meet the computational needs for the design of SRF cavities and cryomodules. These requirements include accurate electromagnetic field computations to obtain the optimal cavity shape for maximum accelerating gradient and to find the high order modes (HOMs) excited by the bunch train in a cavity chain. In addition, multipacting simulation is important to the SRF cavity and coupler development as well as electro-mechanical calculations to model the Lorentz force detuning. Results from ACE3P efforts that address these effects for the design of SRF cavity and cryomodule will be presented.