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| WEOAKI01 |
Optical Stochastic Cooling Proof-of-Principle Experiment
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Cooling of charged particle beams plays a key role in achieving peak luminosity in high-energy colliders. The presently undemonstrated technique of optical stochastic cooling (OSC)* holds promise for fast cooling of high energy protons and heavy ions. A proof-of-principle experiment with electrons is proposed at relatively modest cost using the MIT-Bates South Hall Ring, which is well suited for such a test due to its energy range, layout, and RF system, as well as its present availability. An overview of the experiment will be presented. The design of key systems for the achievement of OSC will be disucussed along with beam requirements and cooling projections.
*M. Zolotorev and A. Zholents, Phys Rev. E 50 (1994) 3087.
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Slides
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| WEOAKI02 |
Observations of Underdense Plasma Lens Focusing of Relativistic Electron Beams
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1907 |
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- M. C. Thompson, H. Badakov, J. B. Rosenzweig, M. C. Thompson, R. Tikhoplav, G. Travish
UCLA, Los Angeles, California
- R. P. Fliller, G. M. Kazakevich, J. K. Santucci
Fermilab, Batavia, Illinois
- J. L. Li
Rochester University, Rochester, New York
- P. Piot
Northern Illinois University, DeKalb, Illinois
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Funding: This work was performed under the auspices of the US Department of Energy under Contract No. DE-FG03-92ER40693 and W-7405-ENG-48.
Focusing of a 15 MeV, 19 nC electron bunch by an underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated in experiments at the Fermilab NICADD Photoinjector Laboratory (FNPL). The strong 1.9 cm focal-length plasma-lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam-envelope evolution observed near the beam waist shows that the spherical aberrations of this underdense lens are lower than those of an overdense plasma lens, as predicted by theory. Correlations between the beam charge and the properties of the beam focus corroborate this conclusion. Time resolved measurements of the focused electron bunch are also reported and all results are compared to simulations.
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