Remote Maintenance Techniques Proposed for the 200-GeV Accelerator

Remote maintenance is one of the prime considerations in determining the size of the mainring enclosure for the 200-GeV accelerator. The maximum residual radiation level 7 h after beam turn-off is expected to be ~50 mR/h in the socalled "quiet" areas of the main ring and approximately 200 R/h at the most intense point in the enclosure. We have assumed a maximum permissible radiation dose per man of one-half the permissible dose allowed by AEC regulations. Therefore, an unshielded man can work for a few hours per week in the quiet areas, but only a, few seconds per week in the "red" radiation areas. He must work rather quickly. For these red radiation areas, we propose using a self-propelled, manned, shielded vehicle on which are mounted two master-slave manipulators to be used as a backup for extension tools pene-trating the vehicle walls.