Design and optimization of the kicker magnets for PERLE (Powerful Energy Recovery LINAC for Experiments)

The Powerful Energy Recovery LINAC for Experiment (PERLE) is a multi turn ERL under construction in Orsay (France). Its main parameters shall correspond to the LHeC design of 802 MHz frequency and 20 mA electron current for 250 MeV energy. and to host nuclear and particle physics experiments. PERLE is an intentional collaboration between CNRS (France), ESS Bilbao (Spain), University of Liverpool and STFC (UK), An-Najah National University (Palestine), Cornell University and the Jefferson lab (USA). It is planned on a phased approach basis enabling early operation and minimally invasive upgrades targeting single turn operation at electron energy of 89 MeV for phase I and three turns at electron energy of 250 MeV for phase II. PERLE is configured as a race track, with one accelerating cryo-module and a drift line completed with a vertical stack of three recirculating arcs separated vertically by 45 cm on each side and connected through the spreader/combiner region to separate/recombine the beams of different energies to the corresponding arcs. The electron beam is accelerated over 3 turns reaching the required energy and being used for a given application at the points of interaction. It is then decelerated over 3 turns in the same structure through 180 RF phase shift in the cryo-module(s) until it attains the injection energy before being dumped. The injector provides 500 pC bunches at a repetition rate of 40.1 MHz, accelerates them to the injection energy of 7 MeV. It is followed by merger line composed of one rectangular dipole, 4 quadrupoles and 2 kickers. The electron beam will then be transported through a diagnostic line. Among the diagnostic elements is a dipole spectrometer used for energy spread measurements. Early generated beam prior to the whole machine construction will be transported through the so called temporary line composed (in addition to other components) of the magnetic elements of the merger and the dipole spectrometer. The work of this internship is to carry out the design of the kicker magnets of the temporary line dedicated for steering the beam. The kickers should provide a magnetic field needed to deviate the beam, based on its energy, along a trajectory defined by the beam dynamics. The choice has been made to adapt electromagnetic technology. The pole material of all magnetic elements should be carefully selected. The coil geometry and material will be studied based on the excitation current and the saturation curve. The student will use FEMM and OPERA softwares with secured access on the servers of the Center of Excellence of High Energy Physics in Palestine (CEHEP2).