Jean-Francois Ostiguy, King-Yuen Ng (Fermilab)
During the course of the last decade, there have been intensive efforts to develop accelerating structures for a future Linear Collider. Normal conducting structures typically rely on detuning of the dipole mode to suppress the long range sum wakefield. An important problem is the efficient computation of this wakefield and the ability to include small alignment and tuning errors. To that end, SLAC has developped an RF circuit model with a demonstrated ability to reproduce experimentally measured wakefields. The wakefield computation involves the repeated solution of a deterministic system of equations over a range of frequencies. By taking maximum advantage of the sparsity of the equations, we have achieved significant performance improvements. These improvements make it practical to consider simulations involving an entire linac ($\sim 10^3$ structures). One might also consider assessing, in real time, the impact of fabrication errors on the wakefield as an integral part of quality control. ,
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