Kenneth Ross MacKenzie (June 15, 1912 – July 3, 2002) was an American nuclear physicist. Together with Dale R. Corson and

Emilio Segrè Emilio Gino Segrè ( ; ; 1 February 1905 – 22 April 1989) was an Italian-American nuclear physicist and radiochemist who discovered the elements technetium and astatine, and the antiproton, a subatomic antiparticle, for which he was award ...

, he synthesized the element

astatine Astatine is a chemical element; it has Symbol (chemistry), symbol At and atomic number 85. It is the abundance of elements in Earth's crust, rarest naturally occurring element in the Earth's crust, occurring only as the Decay chain, decay product ...

, in 1940. MacKenzie received his PhD under

Ernest Lawrence Ernest Orlando Lawrence (August 8, 1901 – August 27, 1958) was an American accelerator physicist who received the Nobel Prize in Physics in 1939 for his invention of the cyclotron. He is known for his work on uranium-isotope separation for ...

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory (LLNL) is a Federally funded research and development centers, federally funded research and development center in Livermore, California, United States. Originally established in 1952, the laboratory now i ...

. Lawrence, MacKenzie, and their colleagues devised the first

cyclotron A cyclotron is a type of particle accelerator invented by Ernest Lawrence in 1929–1930 at the University of California, Berkeley, and patented in 1932. Lawrence, Ernest O. ''Method and apparatus for the acceleration of ions'', filed: Januar ...

. MacKenzie was a professor of physics at the

University of California, Los Angeles The University of California, Los Angeles (UCLA) is a public university, public Land-grant university, land-grant research university in Los Angeles, California, United States. Its academic roots were established in 1881 as a normal school the ...

(UCLA), where he and Reg Richardson built UCLA's first cyclotron and later a

bevatron The Bevatron was a particle accelerator — specifically, a Weak focusing, weak-focusing proton synchrotron — located at Lawrence Berkeley National Laboratory, U.S., which began operations in 1954. The antiproton was discovered there in ...

. MacKenzie devised MacKenzie buckets which are plasma sources created by lining vacuum chamber walls with permanent magnets of alternating polarity to suppress plasma electron losses, that are widely used to this day. He later traveled around the world, helping to troubleshoot various country's cyclotron problems. Later in life, he studied plasma physics and dark matter.

Early life and career

Mackenzie’s family moved to Victoria, British Columbia when he was age 10. He received his Bachelor's degree and Master's degree from the

University of British Columbia The University of British Columbia (UBC) is a Public university, public research university with campuses near University of British Columbia Vancouver, Vancouver and University of British Columbia Okanagan, Kelowna, in British Columbia, Canada ...

, and began further study at the

University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California), is a Public university, public Land-grant university, land-grant research university in Berkeley, California, United States. Founded in 1868 and named after t ...

, in 1937. As a graduate student, Kenneth Ross Mackenzie was involved in the

Manhattan Project The Manhattan Project was a research and development program undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom and Canada. From 1942 to 1946, the ...

to help solve how to separate the rare uranium-235 isotope from the identical dominant uranium-238 isotope at Oak Ridge, Tennessee. While working on the Manhattan project, MacKenzie and colleagues borrowed 14,700 tons of silver from the US Treasury and melted it into strands to replace old copper in their magnetic coils. After the war, the silver was melted and returned to the treasury.

Other roles

As an actor, he played minor roles with

Yvonne De Carlo Margaret Yvonne Middleton (September 1, 1922January 8, 2007), known professionally as Yvonne De Carlo, was a Canadian-American actress, dancer and singer. She became a Cinema of the United States, Hollywood film star and sex symbol in the 1940s a ...

in '' Ride the Pink Horse'' (1947), '' River Lady'' (1948) and '' Black Bart'' (1948). He died in

Los Angeles Los Angeles, often referred to by its initials L.A., is the List of municipalities in California, most populous city in the U.S. state of California, and the commercial, Financial District, Los Angeles, financial, and Culture of Los Angeles, ...

on 4 July 2002 at aged 90.

References

External links

* 1912 births 2002 deaths 20th-century American physicists American nuclear physicists Discoverers of chemical elements Scientists from Portland, Oregon Manhattan Project people University of British Columbia alumni {{US-physicist-stub