PROGRESS REPORT OF THE INTERDIGITAL-H LINAC FOR RADIOACTIVE NUCLEI AT INS

In a radioactive-beam facility at INS, unstable nuclei with a charge-to-mass ratio (q/A) greater than 1/10 are accelerated from 170 to 1053 keV/u by an interdigital-H(IH) linac. The IH linac consists of four acceleration tanks and three sets of quadrupole triplets placed between the tanks. The output energy is continuously variable by changing rf power and phase of the operating tank. Low power and high power tests were performed on the constructed IH cavities. In the first acceleration test using a stable nuclear beam N beam, we succeeded to accelerate the beam up to the designed energy. Further beam tests will be done to obtain better transmission and beam quality.