On Wednesday, March 7, the first high‐energy electrons were produced by the new electron accelerator which was designed, has been built, and will be operated in Cambridge, Mass., as a joint project of the Massachusetts Institute of Technology and Harvard University. In its trial operations, the machine produced a beam of 2.2‐Bev electrons, and at that time it was expected that the maximum design energy of about 6‐Bev would be reached within a matter of weeks. The instrument, a strong‐focusing synchrotron featuring a number of sophisticated innovations, including a “choke” for storing magnetic energy which was suggested by E. M. Purcell of Harvard, is supported by the Atomic Energy Commission and was built at a cost of $12 million. (About six years ago, when the Commission formally announced having approved the construction of the machine, it was estimated that the cost would approximate $6.5 million and that it would be completed in about three and a half years.)

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