• Yu.Belchenko, A.Burdakov, V.Davydenko, V.Dolgushin, A.Dranichnikov, A.Ivanov, A.Khilchenko, V.Kobets, S.Konstantinov, A.Krivenko, A.Kudryavtsev, M.A.Tiunov, V.Savkin, V.Shirokov, I.Sorokin,
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

• J.P.Farrell
  Brookhaven Technology Group, Inc., USA

Status of original 2.0 MeV, 10 mA proton tandem-accelerator with vacuum insulation is presented. The accelerator is intended to be used in facilities generating resonance gamma rays for explosives detection and epithermal neutrons for boron neutron-capture therapy of brain tumors. Steady-state sectioned rectifier from industrial ELV-type electron accelerator is used as a high voltage source for the accelerator. A dc high-current negative ion source has been developed for injection into the tandem. In the tandem accelerator there is set of nested potential electrodes with openings which form a channel for accelerated negative ion beam and subsequently for proton beam after stripping gas target. The electrodes are fixed on a high voltage feedthrough insulator though which required potentials are applied to them from the rectifier by means of resistor voltage divider. In the paper the first experimental results obtained with vacuum insulated tandem accelerator are also given. Keywords: vacuum insulation tandem accelerator, gamma resonance absorption, boron neutron capture therapy.

135

• V.M.Veremeenko, R.V.Voskoboynikov, A.D.Goncharov, Yu.A.Evtushenko, V.V.Kolmogorov, M.N.Kondaurov, G.S.Kraynov, A.M.Kryuchkov, A.S.Medvedko, V.V.Parkhomchuk, S.P.Petrov, V.B.Reva, M.A.Tiunov, B.R.Karymov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

High voltage power supplies, developed for feeding the electron coolers EC-35 and EC-300, are described in this report. Stabilized voltage power supplies with output voltages 35 kV and 300 kV with the current up to 5mA and stability up to 10-5 are used for electron cooling of heavy ion beam. Under high potential of these power supplies there are many auxiliary power supplies, feeding the gun, control electrode, suppressor and control electronics. In this report the original decisions underlying in development of power supplies are considered. The electron coolers were developed under the contract between Budker Institute of Nuclear Physics (Novosibirsk, Russia) and Institute of Modern Physics (Lanzhou, China)

97

• G.N.Ostreiko, K.N.Chernov, V.N.Korchuganov, G.V.Kuznetsov, I.G.Makarov, S.I.Ruvinsky, G.V.Serdobintsev, V.V.Tarnetsky, M.A.Tiunov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The paper presents the electron injector for the linear accelerator of TNK facility (Zelenograd). The injector has rather simple design because of realized injection scheme with no prebunching. The beam is divided into bunches directly by the accelerating RF field of the linear accelerator. The injector block diagram is presented, the process of electron beam bunching and acceleration is described.

185

• V.V.Tarnetsky, V.L.Auslender, K.N.Chernov, V.G.Cheskidov, B.L.Factorovich, V.A.Gorbunov, I.V.Gornakov, M.V.Korobejnikov, G.I.Kuznetsov, A.N.Lukin, I.G.Makarov, S.A.Maksimov, N.V.Matyash, G.N.Ostreiko, A.D.Panfilov, G.V.Serdobintsev, A.V.Sidorov, M.A.Tiunov, V.O.Tkachenko, A.A.Tuvik
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

New industrial accelerator prototype with electron energy up to 5 MeV, average beam power of 300 kW, and duty factor of 14% is under construction at Budker INP. The work is supported by ISTC (Project #2550). At present, the design work is completed, the accelerating structure is under production at INP workshop. The paper presents a general description of the accelerator, its block diagram, and experimental results obtained at recent tests of the accelerating structure and injection unit.

351