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Low Level RF control studies for the SwissFEL


A. Rezaeizadeh, R. S. Smith, T. Schilcher, R. Kalt

Low Level Radio Frequency workshop, Shanghai Institute of Applied Physics, China

This poster gives an overview of the low-level RF automatic control strategies applied on a single RF station as well as multiple RF stations in a linac. The control objectives in a single station includes, but is not limited to, RF pulse shaping based on iterative learning control techniques, and klystron operating point automation (linearization). For the linac control, RF stations contribute differently to the total beam energy, as they might have different energy gains. Therefore, we studied several optimization methods to optimally distribute accelerating voltages over RF stations using beam measurements. The optimality criterion is to keep the total beam energy constant while taking the RF voltage limits into account. The linac control methods are mainly based on convex optimization problems using commercial solvers. The experimental parts of the work are conducted at the SwissFEL test facilities.

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R. S. Smith

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