Experimental Observations of Beam Fluctuations in Space-Charge Dominated Beams

Journal Article · Mon Nov 27 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2409170· OSTI ID:20898709

Tian, K; Zou, Y; Cui, Y; Haber, I; Kishek, R A; Reiser, M; O'Shea, P G ^[1]

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1. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland, 20742 (United States)

With more research and applications demanding high current, high quality electron beams, understanding of longitudinal dynamics of space-charge dominated beams becomes very important. For example, heavy ion beams for High-Energy Density Physics studies need be longitudinally compressed by orders of magnitude to deliver the needed energy on the target, requiring careful control of energy spread. In high-brightness electron injectors for free electron laser applications, fluctuations in the beam waveform must be minimized so as to minimize the effects of coherent synchrotron radiation. At the University of Maryland, we perform experiments on a scaled set-up with low-energy electrons to assess the impact of fluctuations that we deliberately introduce. In this paper, we report experimental observation of the conversion of density modulations into energy modulations. The initial density modulations are generated in the electron gun by varying the operation conditions. Energy perturbation waveforms are measured with a high-resolution energy analyzer. The experimental results are compared with both the linear theory and particle-in-cell code simulations. We discuss the experimental results and the experimental challenges.

• OSTI ID: 20898709
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 877; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRON BEAMS
ELECTRON GUNS
ENERGY DENSITY
FREE ELECTRON LASERS
MODULATION
SIMULATION
SPACE CHARGE
SYNCHROTRON RADIATION
WAVE FORMS