[Doc Ewen looks into the horn antenna, 1950]
Image courtesy of Doc Ewen


Harvard Cyclotron: 1948-1951

Detection of HI Line: 1951

Harvard 24ft and 60ft and NRAO founding: 1952-1956

1950s and 1960s: Two Roads that Crossed

Microwave & Millimeter Wave Applications in the 1970s and 1980s

Mm Wave Radiometry in the 1990s

May 2001 visit to NRAO Green Bank



[Doc Ewen and horn antenna, 2001]
Image courtesy of Doc Ewen

Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

by Doc Ewen, © 2003

Slide 2: Detecting the Interstellar Hydrogen Line, 1951

[external beam machine installed in cyclotron]

The external beam machine installed in the Cyclotron, which consists of a beam scatterer, and the magnetic channel that accepts the scattered particles and directs them out of the cyclotron. The scatterer is shown in greater detail in the next slide.

Slide 3
Modified on Tuesday, 07-Sep-2004 09:10:07 EDT by Ellen Bouton