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Title Analysis of Microbunching Structures in Transverse and Longitudinal Phase Spaces
Authors Cheng Tsai, Rui Li
JLAB number JLAB-ACP-16-2392
LANL number (None)
Other number DOE/OR/23177-4018
Document Type(s) (Meeting) 
Associated with EIC: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)
 

Meeting
Paper compiled for NAPAC 2016

Proceedings
NAPAC2016
Edited By
JACOW (2016)
Page(s) 1177
Publication Abstract: Microbunching instability (MBI) has been a challenging issue in high-brightness electron beam transport for modern accelerators. Our Vlasov analysis of MBI is based on single-pass configuration. For multi-pass recirculation or a long beamline, the intuitive argument of quantifying MBI, by successive multiplication of MBI gains of sub-beamline sections, was found to underestimate the effect. More thorough analyses based on concatenation of gain matrices aimed to combine both density and energy modulations for a general beamline. Yet, quantification still focuses on characterizing longitudinal phase space; microbunching structures residing in (x,z) or (x?,z) was observed in particle tracking simulation. Inclusion of such cross-plane microbunching structures in Vlasov analysis shall be a crucial step to systematically characterize MBI for a beamline complex in terms of concatenating individual beamline segments. We derived a semi-analytical formulation to include the microbunching structures in longitudinal and transverse phase spaces. Using these generalized formulas, we studied an example lattice and found the microbunching gains calculated from multiplication of concatenated gain matrices can be considered as upper limit to the start-to-end gains.
Experiment Numbers: other
Group: Ctr for Adv Stud of Accel
Document: pdf
DOI: https://doi.org/10.18429/JACoW-NAPAC2016-THPOA35
Accepted Manuscript: thpoa35.pdf
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