Claudio Pellegrini

Claudio Pellegrini (born in Rome on May 9, 1935) is an Italian/American physicist known for his pioneering work on X-ray free electron lasers and collective effects in relativistic particle beams.[1] He was educated at the Sapienza University of Rome where he received the Laurea in Fisica summa cum laude in 1958 and the Libera Docenza, in 1965. From 1958 to 1978, he worked at the Laboratori Nazionali di Frascati for high energy and nuclear physics. In the early 1960s, he was at the Nordic Institute for Theoretical Physics (NORDITA) in Copenhagen, working on an alternative formulation of the theory of general relativity using tetrad fields to obtain, among other things, a better description of the energy-momentum complex.[2] (See Teleparallelism for a summary of the theoretical context of this work.) In 1978, he moved to the United States and began work at Brookhaven National Laboratory, where he was an Associate Chairman of the National Synchrotron Light Source and co-director at the Center for Accelerator Physics. In 1989, he accepted an appointment at the University of California at Los Angeles (UCLA) as a professor of physics, and later became a Distinguished Professor.[1]

Claudio Pellegrini in 2015

At the Laboratori Nazionali di Frascati, he worked on the development of electron-positron colliders. He studied the physics of particle beams in accelerators, specifically instabilities and collective effects in high intensity particle beams resulting from the interaction of the particles with a self-generated electromagnetic field.[3] In 1968 he discovered a novel collective effect, the Head-Tail-Instability,[4] which limits the luminosity of a collider. The theory suggested a way to control the instability that has been applied to all colliders and storage rings, increasing the collider luminosity and extending their reach to explore elementary particle physics.

At Brookhaven, he studied free electron lasers (FELs) and their application to the generation of high intensity coherent X-ray pulses.[5] In 1992, based on these studies, he proposed building an X-ray FEL at SLAC National Accelerator Laboratory based on self-amplified spontaneous emission (SASE) in order to create femtosecond long, one angstrom, coherent, X-ray pulses.[6] From 1998-2001, Pellegrini and his collaborators demonstrated experimentally the validity of the SASE theory.[7][8][9] This work and the 1992 proposal led to the construction of the Linac Coherent Light Source (LCLS), the first 1-angstrom X-ray laser, which has been successfully operating at SLAC since 2009. LCLS has opened a new window for the exploration of atomic and molecular science at the one angstrom-one femtosecond length and time scale characteristic of these phenomena.[10]

In 1999, he received the International Free-Electron Laser (FEL) Prize for his work on X-ray free-electron lasers.[1] In 2001, he received the Robert R. Wilson Prize of the American Physical Society.[11] In 2014, he was awarded the Enrico Fermi Award by U.S. President Barack Obama with the citation “For pioneering research advancing understanding of relativistic electron beams and free-electron lasers, and for transformative discoveries profoundly impacting the successful development of the first hard x-ray free-electron laser, heralding a new era for science.”[12][13][14][15] In 2017 he has been elected to membership in the National Academy of Sciences.

References
  1. "Claudio Pellegrini | UCLA Physics & Astronomy" Archived 2018-11-29 at the Wayback Machine Retrieved: Dec 29, 2015.
  2. C. Pellegrini & J. Plebanski (1963). "Tetrad fields and gravitational fields". Mat. Fys. Skr. Dan. Vid. Selsk. 2 (4): 1–39.
  3. "Claudio Pellegrini: A Patriarch of the LCLS" SLAC National Laboratory feature article: Jun 13, 2011. Retrieved Dec 29, 2015
  4. Pellegrini, C., 1969, "On a New Instability in Electron-Positron Storage Rings (The Head-Tail Effect)," Nuovo Cimento, Vol. 64 A, 447.
  5. Murphy J. B. and C. Pellegrini, 1985, “Generation of High Intensity Coherent Radiation in the Soft X-Ray and VUV Region," Journal of the Optical Society of America, B2, 259.
  6. Pellegrini, C., 1992, "A 4 to 0.1 nm FEL Based on the SLAC Linac," in Proceedings of the Workshop on 4th Generation Light Sources, edited by M. Cornacchia and H. Winick, Stanford Synchrotron Radiation Laboratory, 92-02, p. 341.
  7. Hogan, M., et al, 1998, "Measurements of High Gain and Intensity Fluctuations in a Self-Amplified, Spontaneous-Emission Free-Electron Laser," Physical Review Letters, Vol. 80, 289-292.
  8. Hogan, M., et al., 1998, "Measurements of Gain Larger Than 105 at 12μm in a SASE-FEL," Physical Review Letters, Vol. 81, 4867.
  9. Murokh, A., et al., 2003 “Properties of the ultra-short gain length, self-amplified spontaneous emission free-electron laser in the linear regime and saturation”, Phys. Rev. E67, 066501.
  10. "About LCLS" Retrieved Dec 29, 2015
  11. "2001 Robert R. Wilson Prize for Achievement in the Physics of Particle Accelerators Recipient" Retrieved Dec 29, 2015
  12. "President Obama Names Scientists Pellegrini and Shank as 2014 Enrico Fermi Award Recipients" DOE Press Release: Jun 08, 2015. Retrieved Dec 29, 2015
  13. "President Obama Honors Claudio Pellegrini with Enrico Fermi Award" SLAC National Accelerator Laboratory Press Release: Jun 08, 2015. Retrieved Dec 29, 2015
  14. "Claudio Pellegrini, 2014" DOE Press Release: Aug 06, 2015. Retrieved Dec 29, 2015
  15. "Congressional Record Extensions of Remarks Articles" U.S. Congressional Record "In Recognition of Dr. Pellegrini's Receipt of Enrico Fermi Award": Oct 26, 2015. Retrieved Dec 29, 2015
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