TUC —  Circular   (19-Jun-12   14:00—16:00)
Chair: D. Rifuggiato, INFN/LNS, Catania, Italy
Paper Title Page
TUC01 Physical Design of the SPES Facility 136
  • M. Comunian
    INFN/LNL, Legnaro (PD), Italy
  SPES (Selective Production of Exotic Species) is the Italian project for a radioactive ion beam (RIB) facility based on a cyclotron as primary accelerator and on the existing superconducting linac ALPI as post accelerator. The cyclotron, energy up to 70 MeV and total current of 0.75 mA, shared on two exits, is in construction in the industry. The production of neutron-rich radioactive nuclei, with ISOL technique, employs the proton induced fission on a direct target of UCx; the fission rate expected with a proton beam of 40 MeV and 0.2 mA, is 1013 fissions/s. The main goal of physical design of the SPES facility is to provide an accelerator system to perform forefront research in nuclear physics by studying nuclei far from stability, in particular neutron-rich radioactive nuclei with masses in the range of 80–160. The final RIB energy on the experimental target will be up to 11 MeV/A for A = 130, with an intensity in the range of 107–109 pps.  
slides icon Slides TUC01 [5.313 MB]  
TUC02 KEK Digital Accelerator and Recent Beam Commissioning Result 143
  • K. Takayama, T. Adachi, T. Arai, D.A. Arakara, E. Kadokura, T. Kawakubo, T. Kubo, H. Nakanishi, K. Okamura, H. Someya, A. Takagi, M. Wake
    KEK, Ibaraki, Japan
  • H. Asao, Y. Okada
    NETS, Fuchu-shi, Japan
  • Y. Barata, S. Harada
    Tokyo City University, Tokyo, Japan
  • T. Iwashita, K. Okazaki
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture, Japan
  • K.W. Leo
    Sokendai, Ibaraki, Japan
  • X. Liu, T. Yoshimoto
    TIT, Yokohama, Japan
  The digital accelerator (DA), which is a small-scale induction synchrotron "*" requiring no high-energy injector and capable of providing various ions, was constructed at KEK"**". Beam commissioning has been carried out. The KEK-DA consists of a 200 kV high voltage terminal, in which a permanent mag. x-band ECRIS is embedded, 15 m long LEBT, ES injection kicker, and a 10 Hz rapid cycle synchrotron equipped with the induction acceleration system. An ion pulse chopped in 5 micro-sec by the newly developed Marx generator driven Einzel lens chopper"***" was guided through the LEBT and injected by the kicker in one turn. 3 micro-sec ion pulse was successfully captured with a pair of barrier voltage-pulses of 2 kV and accelerated up to 12 MeV with another flat induction-acceleration voltage-pulse through an acceleration period of 50 msec. Beam commissioning started with a He1+ ion beam of 100 microA. Details of fully digital-controlled barrier bucket trapping and induction acceleration are described, although the acceleration/extraction is still at a preliminary stage. Some of unique applications, such as laboratory space science using virtual cosmic rays, will be introduced.
* K.Takayama and R.J.Briggs (Eds), “Induction Accelerators”, (Springer, 2010).
** T. Iwashita et al., Phys. Rev. ST-AB 14, 071301 (2011).
*** T.Adachi et al., Rev. Inst. Meth. 82, 083305 (2011).
slides icon Slides TUC02 [2.126 MB]  
TUC03 Laser Ablation of Solids into an Electron Cyclotron Resonance Ion Sources for Accelerator Mass Spectroscopy 149
  • T. Palchan, F.G. Kondev, S.A. Kondrashev, C. Nair, R.C. Pardo, R.H. Scott, R.C. Vondrasek
    ANL, Argonne, USA
  • W. Bauder, P. Collon
    University of Notre Dame, Indiana, USA
  • J.F. Berg, T. Maddock, G. Palmotti, G. Youinou
    INL, Idaho Falls, Idaho, USA
  • G. Imel
    ISU, Pocatello, Idaho, USA
  • M. Paul
    The Hebrew University of Jerusalem, The Racah Institute of Physics, Jerusalem, Israel
  • M. Salvatores
    CEA Cadarache, Saint Paul Lez Durance, France
  Funding: This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract No. DE-AC02-06CH11357.
A project using accelerator mass spectrometry (AMS) is underway at the ATLAS facility to measure the atom densities of transmutation products present in samples irradiated in the Advanced Test Reactor at INL. These atom densities will be used to infer effective actinide neutron capture cross-sections ranging from Thorium to Califorium isotopes in different neutron spectra relevant to advanced fuel cycles. This project will require the measurement of many samples with high precision and accuracy. The AMS technique at ATLAS is based on production of highly-charged positive ions in an ECRIS followed by injection into a linear accelerator. We use a picosecond laser to ablate the actinide material into the ion source. We expect that the laser ablation technique will have higher efficiency and lower chamber contamination than sputtering or oven evaporation thus reducing ‘cross talk’ between samples. In addition a multi-sample holder/changer is part of the project to allow for a quick change between multiple samples. The results of off-line ablation tests and first results of a beam generated by the laser coupled to the ECR will be discussed as well as the overall project schedule.
slides icon Slides TUC03 [1.610 MB]  
TUC04 Experiences and Lessons Learned at CARIBU with an Open 252Cf Source 155
  • S.I. Baker, J.P. Greene, A. Levand, R.C. Pardo, G. Savard, R.C. Vondrasek, L.W. Weber
    ANL, Argonne, USA
  Funding: This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract No. DE-AC02-06CH11357.
The CARIBU (the CAlifornium Rare Ion Breeder Upgrade) project at ATLAS is based on the creation of beams of neutron-rich nuclei produced as fission fragments from the 3% fission branch that occurs naturally in the decay of Cf-252. These fission fragments are thermalized in ultrapure helium gas and turned into a charged beam for use by the ATLAS accelerator or ‘stopped’ beam experiments. This requires a very thin source, electroplated on a stainless steel or platinum backing so that the fission fragments escape into the helium gas and are efficiently thermalized and collected into an ion beam. The information learned from the successive use of two sources with strengths of 2 mCi and 100 mCi has now prepared us for the installation in mid-summer of a 500 mCi source recently produced by Oak Ridge National Laboratory. This paper will describe the radiological monitoring system and our experience with the two weak “open” sources which have exercised and tested our radiological controls, emissions monitors, and procedures for the CARIBU facility and the source transfer area.
slides icon Slides TUC04 [1.605 MB]