The Lawrence 37-Inch Cyclotron

The Lawrence 37-Inch Cyclotron (HM1Q70)

Location: Berkeley, CA 94720 Alameda County
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Country: United States of America
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N 37° 52.762', W 122° 14.758'

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This is the electromagnet for the world's first major cyclotron. With it, professor Ernest O. Lawrence and others perfected the difficult cyclotron technology. Originally a 27-inch cyclotron, it was converted to a 37-inch instrument in 1937. Weighing 85 tons, this cyclotron was a leviathan of science in its time. It lead the world in atomic particle energies from 1932 until 1939, opening new frontiers in nuclear research.

Discoveries with this cyclotron were numerous, including radioisotopes, such as iodine-131, as well as the first man-made element, technetium. Modified, the magnet first showed in 1941-42 that uranium-235 could be separated magnetically on a large scale.

In 1945, it became the pioneer synchrocyclotron, confirming for the first time the theory of phase stability: the principle governing the operation of the great accelerators built since. This cyclotron stands as a major stepping-stone in the history of science.
May 20, 1968
HM NumberHM1Q70
Year Placed1968
Marker ConditionNo reports yet
Date Added Thursday, December 24th, 2015 at 1:01am PST -08:00
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Locationbig map
UTM (WGS84 Datum)10S E 566310 N 4192698
Decimal Degrees37.87936667, -122.24596667
Degrees and Decimal MinutesN 37° 52.762', W 122° 14.758'
Degrees, Minutes and Seconds37° 52' 45.72" N, 122° 14' 45.48" W
Driving DirectionsGoogle Maps
Area Code(s)510
Which side of the road?Marker is on the right when traveling North
Closest Postal AddressAt or near 1 Centennial Dr, Berkeley CA 94720, US
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