Journal Article

PUBDB-2016-00036

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Linearization of the Longitudinal Phase Space without Higher Harmonic Field

Zeitler, B. (Corresponding author)>Extern* ; Floettmann, K.DESY* ; Grüner, F.>Extern*

2015
Soc. [S.l.]

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Please use a persistent id in citations: doi:10.1103/PhysRevSTAB.18.120102

Abstract: Accelerator applications like free-electron lasers, time-resolved electron diffraction, and advanced accelerator concepts like plasma acceleration desire bunches of ever shorter longitudinal extent. However, apart from space charge repulsion, the internal bunch structure and its development along the beam line can limit the achievable compression due to nonlinear phase space correlations. In order to improve such a limited longitudinal focus, a correction by properly linearizing the phase space is required. At large scale facilities like Flash at DESY or the European XFEL, a higher harmonic cavity is installed for this purpose. In this paper, another method is described and evaluated: Expanding the beam after the electron source enables a higher order correction of the longitudinal focus by a subsequent accelerating cavity which is operated at the same frequency as the electron gun. The elaboration of this idea presented here is based on a ballistic bunching scheme, but can be extended to bunch compression based on magnetic chicanes. The core of this article is an analytic model describing this approach, which is verified by simulations, predicting possible bunch length below 1 fs at low bunch charge. Minimizing the energy spread down to σE/E<10−5 while keeping the bunch long is another interesting possibility, which finds applications, e.g., in time resolved transmission electron microscopy concepts.

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)
2. Uni Hamburg / Experimentalphysik (UNI/EXP)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)

Experiment(s):

1. Relativistic Electron Gun for Atomic Exploration
2. No specific instrument

Appears in the scientific report 2015

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Database coverage:
; ; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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