Abstract
Consideration of laser-driven plasma-based electron/positron accelerators with a 2 TeV center-of-mass energy is presented, employing a multistaging scheme consisting of successive multi-GeV laser wakefield accelerators operated at the plasma density range of ${10}^{15}--{10}^{18}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}3}$ in the quasilinear regime. A total accelerator length is determined by an operating plasma density and a coupling distance allowed for both laser and beam focusing systems. We investigate beam dynamics and synchrotron radiation due to the betatron oscillation of the beam in laser-plasma acceleration, characterizing the beam qualities such as energy spread and transverse emittance. According to the criteria on the beam qualities for applications and available laser sources, the operating plasma density will be optimized. We note that in the low density operation the required wall-plug power for the laser driver will be much reduced in comparison with the high-density options.
Highlights
In the past decades, thanks to vital experimental and theoretical research, the development of laser-driven plasma-based accelerators (LPAs) has evolved from a groundbreaking concept [1] into the reality of the generation accelerator technologies
A present technique guiding a drive laser pulse relies on a plasma channel produced with a discharge capillary, which has demonstrated GeV-class acceleration in a few cm capillary operated at the plasma density of the order of ne $ 1018 cmÀ3 [8,10,11]
We have considered the design issues for laser-plasma accelerators based on the quasilinear laser wakefield regime and the design examples of a LPA-based electron/positron linac for 1 TeV beam energy, operated at the plasma density of 1015, 1016, 2:3 Â 1016, 1017, and 1018 cmÀ3, where the accelerating field is obtained as 1.5, 4.7, 7.2, 15, and 47 GV=m, respectively, for the fixed laser intensity a0 ’ 1:4 and the beam loading efficiency l $ 50%
Summary
Thanks to vital experimental and theoretical research, the development of laser-driven plasma-based accelerators (LPAs) has evolved from a groundbreaking concept [1] into the reality of the generation accelerator technologies. Applications of the multistaged LPA for the high-energy physics experiments require extreme high-quality beams with small energy spread and transverse emittance as well as sufficient charge These requirements reduce the optimum operating plasma density toward the order of ne ’ 1015–1016 cmÀ3 rather than 1017 cmÀ3, at which the operation of the LPA linear collider has been previously conceived [21,22]. Since the degradation of energy spread and transverse emittance is inevitably induced by dephasing and betatron oscillation of accelerated beam particles that undergo strong accelerating and focusing wakefields in the multistaged LPA [23,24], compromising between the linac length and the beam-quality requirements allows us to find the proper operating plasma density.
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