Beam Dump Design for the Rare Isotope Accelerator Fragmentation Line

Stein, W ; Ahle, L E ; Reyes, S

Lawrence Livermore National Laboratory

关键词: Aluminium;    Beam Dumps;    43 Particle Accelerators;    Water;    Heavy Ions;   

DOI  :  10.2172/891066
RP-ID  :  UCRL-TR-221121
RP-ID  :  W-7405-ENG-48
RP-ID  :  891066

美国|英语

来源: UNT Digital Library

【 摘 要 】

Beam dumps for the heavy ion beams of the fragmentation line of the Rare Isotope Accelerator have been designed. The most severe operational case involves a continuous U beam impacting the beam dump with a power of 295 kW and a nominal spot diameter size of 5 cm. The dump mechanically consists of two rotating barrels with a water cooled outer wall of 2 mm thick aluminum. The barrels are 70 cm in diameter and axially long enough to intercept a variety of other beams. The aluminum wall absorbs approximately 15% of the U beam power with the rest absorbed in the water downstream of the wall. The water acts as an absorber of the beam and as a coolant for the 2 mm aluminum wall. The barrel rotates at less than 400 RPM, maximum aluminum temperatures are less than 100 C and maximum thermal fatigue stresses are low at 3.5 x 10{sup 7} Pa (5 ksi). Rotation of the dump results in relatively low radiation damage levels with an operating lifetime of years for most beams.