Raj Rajaratnam, the hedge fund manager sentenced to 11 years in prison for insider trading, was assigned to a federal prison medical center in Massachusetts, according to a person familiar with the matter.  Devens houses male inmates who need specialized or long- term medical or mental health care, according to the Bureau of Prisons website.  Rajaratnam, who says he has health problems including diabetes and will likely need dialysis and an eventual kidney transplant, in Ayer, Massachusetts, 39 miles (63 kilometers) west of Boston. Devens is also designated as an administrative facility, which means it has inmates from different security classifications - from white collar criminals like Rajaratnam to mobsters and sex offenders. Rajaratnam, 54, was ordered by U.S. District Judge Richard Holwell to report to prison on Dec. 5. At Rajaratanam’s request, Holwell, who handed down the sentence on Oct. 13 in Manhattan federal court, recommended the Galleon Group LLC co-founder do his time at the Federal Correctional Complex in Butner, North Carolina, where convicted Ponzi schemer Bernard Madoff is serving a 150-year sentence. John Dowd, Rajaratnam’s lawyer, declined to comment on the prison assignment.  [bloomberg 11/3/11]