A year‐long, half‐million‐dollar program of improvement and reconstruction has renewed and enlarged the capabilities of the cyclotron at the Massachusetts Institute of Technology. When it was designed in 1940, the cyclotron was one of the most powerful and advanced accelerators in the world. The passage of time had rendered it less and less useful, however, and four basic improvements were included in the renewal project: larger target areas, better focusing of the beam, the addition of a modern radiochemistry laboratory, and expanded general research laboratories. To provide the needed space, the entire building, except for the one‐story vault around the cyclotron itself, was torn down and a new building, almost five times as large, was erected.

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