Tunable and precise two-bunch generation at FLASHForward
S. Schr\"oder, K. Ludwig, A. Aschikhin, R. D'Arcy, M. Dinter, P., Gonzalez, S. Karstensen, A. Knetsch, V. Libov, C. A. Lindstr{\o}m, F., Marutzky, P. Niknejadi, A. Rahali, L. Schaper, A. Schleiermacher, B. Schmidt,, S. Thiele, A. de Zubiaurre Wagner, S. Wesch, J. Osterhoff
TL;DR
This paper presents a method for generating tunable, precise two-bunch electron beams at FLASHForward, enabling better control over beam parameters crucial for plasma-wakefield acceleration efficiency.
Contribution
It introduces a collimator-based apparatus for adjustable, femtosecond-level control of bunch length and separation in a plasma acceleration facility.
Findings
Successful generation of adjustable bunch pairs with fs-level control
Enhanced stability and quality of the acceleration process
Potential for improved energy transfer efficiency
Abstract
Beam-driven plasma-wakefield acceleration based on external injection has the potential to significantly reduce the size of future accelerators. Stability and quality of the acceleration process substantially depends on the incoming bunch parameters. Precise control of the current profile is essential for optimising energy-transfer efficiency and preserving energy spread. At the FLASHForward facility, driver--witness bunch pairs of adjustable bunch length and separation are generated by a set of collimators in a dispersive section, which enables fs-level control of the longitudinal bunch profile. The design of the collimator apparatus and its commissioning is presented.
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