Since initial operation of the Minnesota MP tandem Van de Graaff accelerator began in 1966 a number of changes have been made to prevent recurring faults and to improve machine performance. A description of these modifications to the mechanical and electrical structure of the machine and the resulting improvements in performance are summarized. A preliminary report on the operation of accelerator tubes of a modified design is included.
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* This work was supported in part by the U.S. Atomic Energy Commission under contract AT(1 I-1)-1265.