Compact IH-APF type linac for heavy ion implantation

An IHQ type linac for heavy ion implantation of TIT succeeded in accelerati on of proton in end of March 1998. The IHQ cavity has short length (1 m), b ut has large diameter (2 m). The IHQ structure has necessarily long cell le ngth for quadrupole fingertips. Therefore, acceleration frequency is low. T hen, we contrived a new compact IH-linac with alternative-phase-focusing (A PF) system which focuses beam by combination of focus-defocus sections alte rnately. APF structure is suitable to shorten cell length, and diameter of acceleration cavity can be reduced by high frequency. This linac can accele rate particles up to 100 keV/u for charge to mass ratio 1/16, with operatio n frequency of 70 MHz. A cold model in real scale was designed and manufact ured for measurement of its RF characteristics. We studied tuning of gap-vo ltage by using cold model. (C) 2000 Elsevier Science B.V. All rights reserv ed.