• 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.

• M.O.A. El Ghazaly, A.A. Almukhem, A.M. Mandil
  KACST, Riyadh
• A.I. Papash
  JINR, Dubna, Moscow Region
• C.P. Welsch
  Cockcroft Institute, Warrington, Cheshire

At the National Centre for Mathematics and Physics (NCMP), at the King Abdulaziz City for Science and Technology (KACST), Saudi Arabia, a versatile low energy ion injector has been developed in collaboration with the QUASAR group. This project will allow for a broad experimental program with most different kinds of ions both in single pass setups, but also with ions stored in a fixed-energy electrostatic storage ring. In this contribution, the design of the injector is presented. It was designed for beams with energies of up to 30 kV/q and will allow for switching between different ion sources from e.g. duoplasmatron to electrospray ion sources and to thus provide the users with a wide range of different beams. The mechanical construction of the injector is summarized and the status of its assembly at KACST presented.

• G.A. Karamysheva, A.I. Papash
  JINR, Dubna, Moscow Region
• C.P. Welsch
  Cockcroft Institute, Warrington, Cheshire

The Ultra-Low energy Storage Ring (USR) within the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will decelerate antiproton beams from 300 keV to energies of only 20 keV. Cooled beams will then be extracted and provided to external experiments. The large variety of planned experiments requires a highly flexible longitudinal time structure of the extracted bunches, ranging from ultra-short pulses in the nanosecond regime to quasi DC beams. This requires fast as well as slow extraction in order to cover whole range of envisaged beam parameters. A particular challenge was to combine elements for fast and slow extraction in one straight section of this electrostatic ring. In this contribution we present the results of beam dynamic simulations and describe the overall extraction scheme in detail.