• K. Sasa, N. Kinoshita, Y. Nagashima, K. Sueki, T. Takahashi, Y. Tosaki
  UTTAC, Tsukuba, Ibaraki
• K. Bessho, H. Matsumura
  KEK, Ibaraki
• Y. Matsushi
  University of Tokyo, Research Center for Nuclear Science and Technology, Tokyo

Accelerator Mass Spectrometry (AMS) is a highly sensitive mass spectrometric method for measuring rare isotopes. The technique is mainly applied in chronology, earth and environmental sciences to date samples using long-lived radioisotopes. With a multi-nuclide AMS system on the 12 MV Pelletron tandem accelerator at the University of Tsukuba (Tsukuba AMS system), we are able to measure environmental levels of long-lived radioisotopes of C-14, Al-26, Cl-36, Ca-41 and I-129 by employing a molecular pilot beam method. The high terminal voltage of 12 MV is an advantage for AMS to detect heavy radioisotopes. The principle of AMS and applications with the Tsukuba AMS system will be reported in this paper.

• P. Beasley, O. Heid, T.J.S. Hughes
  Siemens AG, Healthcare Technology and Concepts, Erlangen

Air insulated Cockcroft-Walton (Grienacher) cascades have been historically used to generate high voltages for accelerating particles. This paper explores how this technology can be utilised through a system level approach to develop more compact accelerator configurations with much higher voltages and gradients. One such concept is presented that realises a 20MeV, 1mA tandem accelerator that has a footprint ~2m^2

• S. Hatori, S. Fukumoto, Y. Hayashi, H. Kagawa, T. Kurita, E.J. Minehara, S. Nagasaki, Y. Nakata, T. Odagiri, M. Shimada, H. Yamada, F. Yamaguchi, H. Yamamoto, M. Yodose
  WERC, Tsuruga , Fukui

We have operated the accelerator system which consists of a tandem accelerator and a synchrotron since the completion of the construction and beam commissioning at the Wakasa-wan Energy Research Center, Tsuruga, Japan in 2000. The acceleration voltage of the tandem accelerator amounts to 5 MV and is generated by the Dynamitron-type cascade voltage doubler rectifier. The beam from the tandem accelerator is transported to the MeV-ion experimental area for the irradiation to the industrial or biological material and for the ion beam analysis. The tandem beam is also injected to the 200 MeV proton synchrotron. The synchrotron beam has been used for the high energy irradiation and the cancer therapy. The tandem accelerator is used for a lot of purposes including cancer therapy, therefore, stable operation of the system and efficient sharing of the operation duration are required. Developments of the accelerator are presented putting a stress on the stable and efficient operation of the system in this paper.

• A.V. Semenov, V.G. Cherepkov, V. Klyuev, E.S. Konstantinov, E.A. Kuper, V.R. Mamkin, A.S. Medvedko, P.I. Nemytov, V.V. Repkov, V.B. Reva, R.A. Salimov, D.V. Senkov, V.A. Vostrikov
  BINP SB RAS, Novosibirsk

An electrostatic tandem accelerator with 1.25 MV at the high voltage terminal was designed, assembled and successfully commissioned at BINP. The accelerator of ELV-type will be used as injector for cancer therapy facility by carbon ions beams. The 10 keV beam of negative carbon ions with current up to 100 mkA is injected into the tandem and charge exchange in the vacuum heat insulation magnesium vapor target. The results of commissioning tests and beam parameters measurements are presented.