Iran has successfully tested two advanced centrifuges (the IR2-M and the IR-4) at its Natanz enrichment plant, according to the head of the Atomic Energy Organization of Iran, Fereydoun Abbasi. Abbasi said these centrifuge models were ready for use. If these new centrifuges perform well, and if they can be deployed in sufficient numbers, Iran could produce about six times more enriched uranium per machine than is produced by the IR-1 centrifuges currently in use, according to a former head of safeguards at the International Atomic Energy Agency.