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Ernest Courant (born March 26, 1920)〔(''Array of Contemporary American Physicists'' )〕 is an American accelerator physicist and a fundamental contributor to modern large-scale particle accelerator concepts. His most notable discovery is his 1952 work with Milton S. Livingston and Hartland Snyder on the Strong focusing principle, a critical step in the development of modern particle accelerators like the synchrotron.〔(Distinguished Scientist Emeritus Ernest Courant Honored by University of Rochester (BNL Bulletin) )〕 Currently, Ernest Courant is a member the National Academy of Sciences, and remains active as a distinguished scientist emeritus at Brookhaven National Laboratory. He has played a part in the work of Brookhaven for sixty years and has also been mentor to several generations of students. In this kind of generative academic influence, he can be compared to his father, the mathematician Richard Courant. ==Early life== The first of their four children, he was born March 26, 1920 in Göttingen, Germany, to Richard Courant and Nerina Runge Courant, a year after their marriage.〔"Richard Courant." World of Mathematics. Online. Thomson Gale, 2006. Reproduced in Biography Resource Center. Farmington Hills, Mich.: Gale, 2008.〕 He has written that he "came by science naturally". His mother's father, Carl Runge, is credited with the Runge-Kutta method for numerical solutions of differential equations. A maternal great-grandfather (Runge's father-in-law ) was Emil DuBois-Reymond, a pioneer in electrophysiology. Affinity for science and mathematics extended further than his biological family. Ernest Courant's childhood neighbors included the mathematician David Hilbert (his father's thesis director, in whose honor Ernest received the middle name of David) and the physicists Max Born and James Franck. Further, his father's students and colleagues became friends of the family, and often visited. Ernest's early interests centered on chemistry. "I had a lab at home full of test tubes, Bunsen burners, and chemicals. Once there was a small fire (easily put out), but I got a sense of how things were put together."〔 Adolf Hitler came to power in 1933, and the neighborhood and its intellectual society were disrupted—along with the mathematics department at the University. Ernest's father had been born to a Jewish family of small businessmen, and he was now identified as a Jew, and an undesirable, by the new regime.〔"(Richard Courant )" biography at the University of St. Andrews.〕 Expelled from his position at the University of Göttingen, Richard Courant took a temporary teaching position in England, and the family abandoned Göttingen in favor of Cambridge for a few months. Forewarned by a Nazi acquaintance that the anti-Semitic storm would not settle but intensify, the family made plans to emigrate permanently. They returned only briefly to Germany before embarking to New York City, where his father had secured a post at New York University—and immigration visas to the USA. Fluent in English from both early lessons and the recent period enrolled at the Perse School in Cambridge, Ernest was accepted at the Fieldston School of the School for Ethical Culture, with a scholarship, thanks to intervention by family friend (and Fieldston alumnus), J. Robert Oppenheimer. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ernest Courant」の詳細全文を読む スポンサード リンク
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