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Jarvis J, Lebedev V, Romanov A, Broemmelsiek D, Carlson K, Chattopadhyay S, Dick A, Edstrom D, Lobach I, Nagaitsev S, Piekarz H, Piot P, Ruan J, Santucci J, Stancari G, Valishev A. Experimental demonstration of optical stochastic cooling. Nature 2022; 608:287-292. [PMID: 35948709 PMCID: PMC9365692 DOI: 10.1038/s41586-022-04969-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/13/2022] [Indexed: 12/02/2022]
Abstract
Particle accelerators and storage rings have been transformative instruments of discovery, and, for many applications, innovations in particle-beam cooling have been a principal driver of that success1. Stochastic cooling (SC), one of the most important conceptual and technological advances in this area2–6, cools a beam through granular sampling and correction of its phase-space structure, thus bearing resemblance to a ‘Maxwell’s demon’. The extension of SC from the microwave regime up to optical frequencies and bandwidths has long been pursued, as it could increase the achievable cooling rates by three to four orders of magnitude and provide a powerful tool for future accelerators. First proposed nearly 30 years ago, optical stochastic cooling (OSC) replaces the conventional microwave elements of SC with optical-frequency analogues and is, in principle, compatible with any species of charged-particle beam7,8. Here we describe a demonstration of OSC in a proof-of-principle experiment at the Fermi National Accelerator Laboratory’s Integrable Optics Test Accelerator9,10. The experiment used 100-MeV electrons and a non-amplified configuration of OSC with a radiation wavelength of 950 nm, and achieved strong, simultaneous cooling of the beam in all degrees of freedom. This realization of SC at optical frequencies serves as a foundation for more advanced experiments with high-gain optical amplification, and advances opportunities for future operational OSC systems with potential benefit to a broad user community in the accelerator-based sciences. Stochastic cooling at optical frequencies is demonstrated in an experiment at the Fermi National Accelerator Laboratory’s Integrable Optics Test Accelerator, substantially increasing the bandwidth of stochastic cooling compared with conventional systems.
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Affiliation(s)
- J Jarvis
- Fermi National Accelerator Laboratory, Batavia, IL, USA.
| | - V Lebedev
- Fermi National Accelerator Laboratory, Batavia, IL, USA.
| | - A Romanov
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | | | - K Carlson
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - S Chattopadhyay
- Fermi National Accelerator Laboratory, Batavia, IL, USA.,Department of Physics, Northern Illinois University, DeKalb, IL, USA.,SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - A Dick
- Department of Physics, Northern Illinois University, DeKalb, IL, USA
| | - D Edstrom
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - I Lobach
- Department of Physics, The University of Chicago, Chicago, IL, USA
| | - S Nagaitsev
- Fermi National Accelerator Laboratory, Batavia, IL, USA.,Department of Physics, The University of Chicago, Chicago, IL, USA
| | - H Piekarz
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - P Piot
- Department of Physics, Northern Illinois University, DeKalb, IL, USA.,Argonne National Laboratory, Argonne, IL, USA
| | - J Ruan
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - J Santucci
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - G Stancari
- Fermi National Accelerator Laboratory, Batavia, IL, USA
| | - A Valishev
- Fermi National Accelerator Laboratory, Batavia, IL, USA
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Shiltsev V, Alexahin Y, Burov A, Valishev A. Landau Damping of Beam Instabilities by Electron Lenses. Phys Rev Lett 2017; 119:134802. [PMID: 29341724 DOI: 10.1103/physrevlett.119.134802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Indexed: 06/07/2023]
Abstract
Modern and future particle accelerators employ increasingly higher intensity and brighter beams of charged particles and become operationally limited by coherent beam instabilities. Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers, and use of chromatic effects, become less effective and insufficient. We show that, in contrast, Lorentz forces of a low-energy, magnetically stabilized electron beam, or "electron lens," easily introduce transverse nonlinear focusing sufficient for Landau damping of transverse beam instabilities in accelerators. It is also important to note that, unlike other nonlinear elements, the electron lens provides the frequency spread mainly at the beam core, thus allowing much higher frequency spread without lifetime degradation. For the parameters of the Future Circular Collider, a single conventional electron lens a few meters long would provide stabilization superior to tens of thousands of superconducting octupole magnets.
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Affiliation(s)
- V Shiltsev
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA
| | - Y Alexahin
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA
| | - A Burov
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA
| | - A Valishev
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA
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Stancari G, Valishev A, Annala G, Kuznetsov G, Shiltsev V, Still DA, Vorobiev LG. Collimation with hollow electron beams. Phys Rev Lett 2011; 107:084802. [PMID: 21929171 DOI: 10.1103/physrevlett.107.084802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Indexed: 05/31/2023]
Abstract
A novel concept of controlled halo removal for intense high-energy beams in storage rings and colliders is presented. It is based on the interaction of the circulating beam with a 5-keV, magnetically confined, pulsed hollow electron beam in a 2-m-long section of the ring. The electrons enclose the circulating beam, kicking halo particles transversely and leaving the beam core unperturbed. By acting as a tunable diffusion enhancer and not as a hard aperture limitation, the hollow electron beam collimator extends conventional collimation systems beyond the intensity limits imposed by tolerable losses. The concept was tested experimentally at the Fermilab Tevatron proton-antiproton collider. The first results on the collimation of 980-GeV antiprotons are presented.
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Affiliation(s)
- G Stancari
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA.
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