The 300 MeV electron linear accelerator had been constructed in 1967. In the Great East Japan Earthquake (March 11, 2011), serious damages was inflicted on this linac and a low energy part of the linac was reconstructed as a high intensity electron linac. The linac consists of 90 keV thermionic cathode gun, a buncher section and eight 1m-long s-band accelerating structures. Maximum energy of the linac is 70 MeV without beam loading. The linac is operated with 300 Hz repetition rate and a peak current in macropulse is approximately 100 mA with 3 micro-sec pulse duration. The average beam current is about 100 micro-Ampere. This high current electron beam is used for radio isotope production by photonuclear reactions.
| Linac Energy | Modulator Repetition | Macropulse Peak Current | Macropulse Duration | Average Current |
|---|---|---|---|---|
| 50 MeV | 300 Hz | 〜130 mA | 3.0 µs | 120 µA |
| 30 MeV | 300 Hz | 〜100 mA | 3.0 µs | 90 µA |
