Alvarez's Groundbreaking Search for the First Proton Beam - A Milestone in Particle Physics

Jan 17, 2026

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On October 16, 1947, Rolf Widerøe collaborated with Luis Alvarez in their quest to achieve the first beam from the proton linear accelerator. This pivotal night saw Alvarez's calculations on the blackboard at 8:30 p.m., suggesting a necessary shift in geometry, as he deemed that the "machine would not work." Remarkably, just six hours later, by 2:40 a.m., they successfully produced the beam. This achievement laid the groundwork for advancements in RFQ velocity multipliers, synchrocyclotrons, and synchrotrons, revolutionizing particle physics.

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Alvarez's Groundbreaking Search for the First Proton Beam - A Milestone in Particle Physics

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Wideröe (Rolf)

Alvarez Search for the first beam from the proton linear accelerator (10/16/47). Alvarez's 8:30 p.m. blackboard calculation 'proving' that geometry must be changed and that the "machine would not work", with an added note that at 2:40 a.m., six hours later, they achieved the beam.