Abstract
The EuPRAXIA project aims at designing the world's first accelerator based on advanced plasma-wakefield techniques to deliver 5 GeV electron beams that simultaneously have high charge, low emittance and low energy spread, which are required for applications by future user communities. Meeting this challenging objective will only be possible through dedicated effort. Many injection/acceleration schemes and techniques have been explored by means of thorough simulations in more than ten European research institutes. This enables selection of the most appropriate methods for solving each particular problem. The specific challenge of generating, extracting and transporting high charge beams, while maintaining the high quality needed for user applications, are being tackled using innovative approaches. This article highlights preliminary results obtained by the EuPRAXIA collaboration, which also exhibit the required laser and plasma parameters.
Highlights
Particle acceleration using plasma wakefields have field gradients several orders of magnitude higher than conventional RF fields
The Resonant Multi-Pulse Ionization Injection (ReMPI) technique is more complex as it requires to split the laser pulse into three pulses, the first of small energy for ionizing the gas, the second containing the main part of energy itself decomposed in a series of 4 sub-pulses to excite the wakefield without ionizing the gas, and the third pulse carrying a tiny fraction of energy to symmetrize the beam in the perpendicular direction
The following three recommendations can be suggested for mitigating emittance growth effectively: 1) minimizing emittance and energy spread during acceleration, which should be done exclusively in the plasma acceleration part; 2) minimizing the Twiss parameter at the plasma exit, which should be done exclusively in the plasma down ramp, with the reservation that the latter would not itself induce significant emittance growth; 3) minimizing the total length and integrated focusing strength in the transfer line, which should be the exclusive role of the focusing elements in the transfer line
Summary
Particle acceleration using plasma wakefields have field gradients several orders of magnitude higher than conventional RF fields. The ReMPI technique is more complex as it requires to split the laser pulse into three pulses (see Fig. 4), the first of small energy for ionizing the gas, the second containing the main part of energy itself decomposed in a series of 4 sub-pulses to excite the wakefield without ionizing the gas, and the third pulse carrying a tiny fraction of energy to symmetrize the beam in the perpendicular direction. This process generates a 30 pC, 150 MeV beam with. In the case of Trojan Horse Injection, the reverse is achieved: a strong particle beam excites the wakefield and a weak laser beam delicately ionizes the gas to generate small emittance beams [20]
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