小型ECRイオン源におけるマイクロ波２重加熱試験

A prototype compact electron cyclotron resonance ion source, named Kei3, based on Kei series has been developed to correspond to produce these various ions at National Institute of Radiological Sciences. The magnetic field is formed by the same permanent magnet as Kei2. We investigated basic performance of the Kei3 source at previous experiment. Maximum beam intensity of C4+, N5+, O6+ and Ne7+ were 565 eA, 185 eA, 99 eA and 50.5 eA, respectively. In order to increase a beam intensity of heavy ion such as argon, we tested two frequency heating method. Two Traveling-Wave-Tube (TWT) amplifiers were used for this experiment. Microwave frequency of TWT1 and TWT2 are 8-10 and 10-18 GHz, respectively. As a result, beam current of Ar8+ was increased by using two TWT amplifiers