Title: Efficiency versus instability in plasma accelerators

Abstract

Here, 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 γ-γ 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.

Authors:

Lebedev, Valeri; Burov, Alexey; Nagaitsev, Sergei

Publication Date:

2017-12-20

Research Org.:

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:

1414324

Alternate Identifier(s):

OSTI ID: 1346364

Report Number(s):

FERMILAB-PUB-17-003-AD; arXiv:1701.01498
Journal ID: ISSN 2469-9888; PRABCJ; 121301

Grant/Contract Number:  

AC02-07CH11359

Resource Type:

Published Article

Journal Name:

Physical Review Accelerators and Beams

Additional Journal Information:

Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 12; Journal ID: ISSN 2469-9888

Publisher:

American Physical Society

Country of Publication:

United States

Language:

English

Subject:

43 PARTICLE ACCELERATORS