The Purdue University Physics Department operated a cyclotron during the early part of the war, conducting important nuclear research. Many of the scientists working on the project were transferred to Los Alamos to continue work on the Manhattan Project.
For more information, see A History of Physics at Purdue: The War Period (1941-1945).
Bob Carter discusses his Manhattan Project work at Purdue. The full interview transcript can be found on "Voices of the Manhattan Project."