Abstract
A beam rebuncher for the RIKEN radioactive-isotope beam factory project has been constructed and is placed in a long beam line between the first two ring cyclotrons in the accelerator cascade. The rebuncher resonator, having four rf gaps in it, operates at a fixed frequency of 109.5MHz for the longitudinal focusing of heavy ion beams at 11.0MeV/u. To reduce the sparking problem in the rf gaps, a new type of H-mode resonator has been adopted, where the distribution of the gap voltage is well equalized. In fact, the ratio of the gap voltages is about 1.26, whereas those of the interdigital-H (IH)- and crossed-bar-H (CH)-mode structures are larger than 2.0. The total gap voltage, which is defined as the sum of the four gap voltages, has reached 495kV at a power consumption of 4.7kW.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
