By Ingalis A.G. (ed.)

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High frequency power tubes — first for 200 MHz and later in the gigahertz (GHz) range — became available, and linacs for relativistic particles became feasible. At a frequency of 1 GHz the wavelength shrinks to 30 centimeters, scaling down the length of the linac by many orders of magnitude. In the 1950s, this technology was incorporated into linacs, and the betatrons of the 1940s (see Chapter IV) were superseded by much larger and higher energy electron linacs. That Ising’s brilliant idea had to wait more than two decades is sad.

There are two basic kinds of focusing depending on the fields: electrostatic and magnetic. Both were discovered, in the course of looking for other things, by Stan Livingston. In the earliest cyclotrons the open ends of the “Dees,” which were like a cake tin cut across its diameter, were closed by a grid of wires. This was put in at the risk of scattering particles out of the beam, in the belief that it would produce a much more even accelerating field in the gap between the two halves of the tin and keep the beam in resonance.

Up until that time only the west and east coasts boasted accelerators. The MURA Group was led by Donald Kerst of betatron fame, and made He was born in Zhitomir and educated at Moscow State University, receiving a Diploma in Electrical Engineering in 1931, a Candidate Degree in Physico-Mathematical Science in 1934 and Doctor of Physico-Mathematical Science in 1940. He worked at the All-Union Institute of Electrical Engineering from 1930 until 1936, the Lebedev Institute of Physics from 1936 to 1956, and then, for the rest of his career, at the Joint Institute for Nuclear Research in Dubna.

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Amateur telescope making by Ingalis A.G. (ed.)


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