Kenneth Ross MacKenzie (June 15, 1912 – July 4, 2002) together with Dale R. Corson and

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

, synthesized the element

astatine Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. All of astatine's isotopes are short-live ...

, in 1940. MacKenzie received his PhD under

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

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory (LLNL) is a federal research facility in Livermore, California, United States. The lab was originally established as the University of California Radiation Laboratory, Livermore Branch in 1952 in response ...

. Lawrence, MacKenzie, and their colleagues devised the first

cyclotron A cyclotron is a type of particle accelerator invented by Ernest O. 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: Jan ...

. He was a professor of physics at

UCLA The University of California, Los Angeles (UCLA) is a public land-grant research university in Los Angeles, California. UCLA's academic roots were established in 1881 as a teachers college then known as the southern branch of the California ...

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

bevatron The Bevatron was a particle accelerator — specifically, a weak-focusing proton synchrotron — at Lawrence Berkeley National Laboratory, U.S., which began operating in 1954. The antiproton was discovered there in 1955, resulting 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.

Help with the Manhattan Project

Dr. K. R. Mackenzie’s family moved to Victoria, British Columbia when he was age 10. He received his bachelors and masters degree from the University of British Columbia, and began further study at the University of California, Berkeley in 1937. As a graduate student, Kenneth Ross Mackenzie was involved in the

Manhattan Project The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946, the project w ...

to help solve how to separate the rare uranium-235 isotope from the identical dominant uranium-238 isotope at Oak Ridge, Tennessee. As an interesting side note, 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 Hollywood film star in the 1940s and 1950s, made several recordings, and later ...

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

Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...

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 {{US-physicist-stub