TUB —  Electrostatic   (19-Jun-12   10:30—12:30)
Chair: R. Repnow, MPI-K, Heidelberg, Germany
Paper Title Page
TUB01 Development of NRA System for a 1.7MV Tandem Accelerator-Human Resource Development Program for Nuclear Engineering, The University of Tokyo 115
  • S. Ito, H. Matsuzaki, A. Morita
    The University of Tokyo, Tokyo, Japan
  The 1.7MV tandem accelerator (RAPID) at the University of Tokyo has been used for various research projects and educational studies since its installation in 1994. Recently RAPID has contributed to educational program for study by utilizing high sensitive ion beam analysis methods of the accelerator. In the fall of 2011, we newly developed a NRA (Nuclear Reaction Analysis) system with BGO scintillator. Detecting the resonant reaction 19F (p, αγ) 16O, a special student experimental class was successfully performed as a “Human resource development program for nuclear engineering”. The feature of this experiment is very few in advanced case study, which has performed with combine multiple ion beam correspond to a purpose for experiment. In this program students make their own samples for NRA analysis by ion implantation. Later in the year, RAPID will be relocated to the University of Tokyo (HIT facility) in Ibaraki prefecture to replace the 1MV tandem accelerator which was damaged by the Great East Japan Earthquake on March of 2011.  
slides icon Slides TUB01 [1.426 MB]  
TUB02 New Developments at the Tandem Accelerators Laboratory at IFIN-HH 118
  • D.G. Ghita, I.C. Calinescu, S. Dobrescu, N.M. Marginean, I.O. Mitu, T.B. Sava, B. Savu
    IFIN, Magurele- Bucuresti, Romania
  • Gh. Cata-Danil, M.S. Dogaru, M. Enachescu, M.M. Gugiu, P. Ionescu, D.V. Mosu, A. Pantelica, D. Pantelica, A. Petre, I. Popescu, C.A. Simion, C. Stan-Sion, M. Statescu, N.V. Zamfir
    Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest, Romania
  The upgrade of the 9 MV Tandem accelerator at IFIN-HH started in 2007. Remarkable improvements were done in the last 5 years that can be seen in the improved performance and reliability of the machine. Using original preparation techniques, some new beam species were tested for the first time in our laboratory. This opened the door to new experiments. A major improvement for the laboratory is the installation of 1 MV Tandetron accelerator dedicated to ultra-sensitive AMS measurements of C-14, Be-10, Al-26 and I-129, and 3 MV Tandetron accelerator dedicated to ion beam analysis. The main directions of the research activity in the laboratory will be shortly presented.  
slides icon Slides TUB02 [3.686 MB]  
TUB03 Terminal Voltage Stabilization of Pelletron Tandem Accelerator 124
  • N.R. Lobanov, M.C. Blacksell, P. Linardakis, D. Tsifakis
    Research School of Physics and Engineering, Australian National University, Canberra, Australia
  Funding: Heavy Ion Accelerators Education Investment Fund (EIF)
A conventional corona control terminal voltage stabiliser has been investigated on the ANU 14UD tandem accelerator. The fluctuations in the charge transport of electrostatic pelletron generator and their correlation with mechanical oscillations of the chains and terminal voltage ripple have been analysed. Emphasis is placed on the performance of the two-loop feedback system and on the tuning of this system to production of high energy-resolution beams. The transfer function for the corona regulation loop has been determined and examined. The system produces the beam position at the image slit of the 90 energy-analysing magnet with long-term stability equivalent to a few hundred volts rms fluctuation of the terminal voltage. The concept of novel fast control loop utilizing the high-frequency component from the image slits to control the voltage of the last gap of high-energy acceleration tube is discussed.
slides icon Slides TUB03 [4.693 MB]  
TUB04 LINAC Experience In The First Two Years of Operation @ CNAO (Centro Nazionale Adroterapia Oncologica) 129
  • S. Vitulli, E. Vacchieri
    CNAO Foundation, Milan, Italy
  • A. Reiter, B. Schlitt
    GSI, Darmstadt, Germany
  CNAO is the first medical accelerator facility for deep hadrontherapy with C6+ and H3+ in Italy. The LINAC device at CNAO include a RFQ structure accelerating up to 400 keV/u and an IH structure works up to 7 MeV/u. Such LINAC works as injector in a 78 m circumference synchrotron where the beam reaches up to 400 MeV/u. The LINAC commissioning was performed during 2009 and from beginning of 2011, it entered into routine and continuous operation. First patient was treated in September 2011. The principal LINAC parameters are daily monitored, like output energy (by means of online not destructive ToF measurements), cavities voltage, cavities RF forward power, beam current transmission. No major faults were observed in the first two years of operation. LINAC beam is stable within an error of ±0.02 MeV/u. The relation between LINAC extraction and synchrotron injection is under investigation. This paper summarizes the monitoring issues (i.e. reproducibility of settings and beam parameters as well as long term stability measures) on the CNAO LINAC during daily patient treatments and outlines the measurements performed in the initial commissioning compared within actual status.