Efficiency versus instability in plasma accelerators

Plasma wakefield acceleration is one of the main technologies being developed for future high-energy colliders. Potentially, it can create a cost-effective path to the highest possible energies for $e^{+}{e}^{-}$ or $\gamma -\gamma$ colliders and produce a profound effect on the developments for high-energy physics. Acceleration in a blowout regime, where all plasma electrons are swept away from the axis, is presently considered to be the primary choice for beam acceleration. In this paper, we derive a universal efficiency-instability relation, between the power efficiency and the key instability parameter of the trailing bunch for beam acceleration in the blowout regime. We also show that the suppression of instability in the trailing bunch can be achieved through Balakin-Novokhatsky-Smirnov damping by the introduction of a beam energy variation along the bunch. Unfortunately, in the high-efficiency regime, the required energy variation is quite high and is not presently compatible with collider-quality beams. We would like to stress that the development of the instability imposes a fundamental limitation on the acceleration efficiency, and it is unclear how it could be overcome for high-luminosity linear colliders. With minor modifications, the considered limitation on the power efficiency is applicable to other types of acceleration.

Figure 1

The bubble shape and particle distributions (black lines) for drive and trailing bunches, with $n_0={10}^{17}{\mathrm{cm}}^{-3}$. The red and blue lines mark the parts of the bubble occupied by the drive and trailing bunches, respectively. The dashed brown line shows the analytical continuation of the bubble shape in the absence of bunch particles inside the bubble. The accelerating and decelerating fields are constant: $E_d=50\mathrm{GV}/\mathrm{m}$ and $E_t=100\mathrm{GV}/\mathrm{m}$.

Figure 2

Dependence of the longitudinal wake on the longitudinal coordinate $\xi$ for different locations of the leading particle ${\xi }_2=-4$, $-2$, 0, 2, 4; $R_b{k}_p=5.25$, ${\xi }_b{k}_p=4.448$. The dashed line shows the function $4/[r_b(\xi )k_p{\text{]}}^2$, which is directly related to the wake function of Eq. (20).

Figure 3

The dependencies of ratios for the tail amplitude particles (top solid line) and the rms amplitude of all particles (bottom dashed line) to the initial amplitude $A_0$.