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James Roger Prior Angel (born February 7, 1941) is a British-American astrophysicist known for his contributions to astronomy and the design and fabrication of large optics for telescopes, solar power and other applications. He developed the spin casting and stressed lap polishing techniques used at the University of Arizona Richard F. Caris Mirror Lab to produce mirrors for some of the largest optical telescopes in the world. He is a Regents' Professor of Astronomy and Optical Sciences at the University of Arizona.

Education

Angel graduated from St Peter's College, Oxford, with a BA, in 1963, from California Institute of Technology, with an MS, in 1966, and from the University of Oxford, with a D Phil, in 1967. While at Oxford's Clarendon Laboratory he built an early computer to allow for the first direct measurement an atom's quadrupole moment.

Career and research

He has taught at Columbia University. He is a Fellow of the Royal Society. He was elected a Fellow of the American Academy of Arts and Sciences in 1990.

In 1979, he proposed the lobster-eye optics principle for X-rays.

In 2006, Angel proposed assembling a space sunshade to mitigate global warming by placing trillions of 0.6-meter, 1-gram disks of refractive material into stable orbit between the Earth and the Sun (Lagrange point 1, or L₁). The disks would be launched in stacks of 800,000 by electromagnetic acceleration and transported to L₁ (1.5 Gm from Earth) via ion propulsion. After separation the individual disks would remain in place by autonomously modulating solar radiation pressure. Together the cloud of disks would deflect 2% of solar radiation onto the Earth, enough to counteract the warming effect of a 100% increase in atmospheric carbon dioxide from pre-industrial levels. He concluded that such a sunshield "could be developed and deployed in ≈25 years at a cost of a few trillion dollars, <0.5% of world gross domestic product (GDP) over that time."

On August 23, 2012, Angel and his inventions were the subject of a story on NPR's Morning Edition.

Awards

• 1976 Newton Lacy Pierce Prize in Astronomy
• 1996 MacArthur Fellows Program
• 2007 Joseph Fraunhofer Award/Robert M. Burley Prize
• 2010 Kavli Prize for Astrophysics
• 2016 National Inventors Hall of Fame

References

1. ^ "Roger Angel | American astronomer | Britannica".
2. Gibbs, Wayt (December 1, 2005). "Breaking the Mold". Scientific American.
3. ^ "J. Roger Angel | Professor of Astronomy". Wyant College of Optical Sciences. The University of Arizona. Retrieved April 2, 2024.
4. Angel, Roger (1967-08-15). "Direct Measurement of an Atomic Quadrupole Moment". The Journal of Chemical Physics. 47 (4): 1552–1553. Bibcode:1967JChPh..47.1552A. doi:10.1063/1.1712116.
5. "Book of Members, 1780-2010: Chapter A" (PDF). American Academy of Arts and Sciences. Retrieved April 18, 2011.
6. Hartline, Beverly Karplus (4 January 1980). "Lobster-Eye X-ray Telescope Envisioned". Science. 207 (4426): 47. Bibcode:1980Sci...207...47K. doi:10.1126/science.207.4426.47. ISSN 0036-8075. Retrieved 29 December 2023.
7. Angel, Roger (2006-11-14). "Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1)". Proceedings of the National Academy of Sciences. 103 (46): 17184–17189. Bibcode:2006PNAS..10317184A. doi:10.1073/pnas.0608163103. ISSN 0027-8424. PMC 1859907. PMID 17085589.
8. Palca, Joe (2012-08-23). "Telescope Innovator Shines His Genius On New Fields". NPR.
9. "Fellowships Reward Bright Stars", Associated Press, The Free Lance-Star, Terri Likens, June 19, 1996
10. "Optical Society of America Confers 17 General and Specialty Awards for 2007 | Optica". www.optica.org. Retrieved 2024-06-11.
11. "J. Roger P. Angel - Lightweight Mirrors for Astronomical Telescopes". National Inventors Hall of Fame. Retrieved June 4, 2016.

• 1941 births
• Living people
• American astronomers
• Alumni of St Peter's College, Oxford
• California Institute of Technology alumni
• Columbia University faculty
• University of Arizona faculty
• MacArthur Fellows
• Honorary Fellows of St Peter's College, Oxford
• Fellows of the Royal Society
• Fellows of the American Academy of Arts and Sciences
• Kavli Prize laureates in Astrophysics
• Recipients of the Newton Lacy Pierce Prize in Astronomy