INFN/LNL, Legnaro
INFN/LNS, Catania
SPES (Selective Production of Exotic Species) is an INFN project to develop a Radioactive Ion Beam (RIB) facility as an intermediate step toward EURISOL. The SPES project is part of the INFN Road Map for the Nuclear Physics development in Italy and is supported by LNL and LNS the INFN National Laboratories of Nuclear Physics in Legnaro and Catania. The Laboratori Nazionali di Legnaro (LNL) was chosen as the facility site due to the presence of the PIAVE-ALPI accelerator complex, which will be used as re-accelerator for the RIBs. The SPES project is based on the ISOL method with an UCx Direct Target and makes use of a proton driver of at least 40 MeV energy and 200 microA current. Neutron-rich radioactive beams will be produced by Uranium fission at an expected fission rate in the target in the order of 1013 fissions per second. The key feature of SPES is to provide high intensity and highquality beams of neutron rich nuclei to perform forefront research in nuclear structure, reaction dynamics and interdisciplinary fields like medical, biological and material sciences. The exotic isotopes will be re-accelerated by the ALPI superconducting linac at energies up to 10AMeV for masses in the region of A=130 amu with an expected rate on target of 109 pps.
MLL/TU, München
The Tandem accelerator of the Maier-Leibnitz-Laboratorium (MLL), the former "Beschleunigerlabor der LMU und TU München“ was running very reliable during the last years. The status of the Tandem accelerator will be presented and some technical problems of the past years of operation will be discussed. The MAFF project (Munich Accelerator for Fission Fragments) was suspended due to missing funding. MAFF was planned be the successor of the Tandem accelerator. In the next years the Tandem accelerator will be useful for experiments in the framework of the two clusters of excellence “Origin and Structure of the Universe” and MAP (Munich Centre for Advanced Photonics). The Tandem ion beams are applied for experiments in the field of nuclear astrophysics, AMS with astrophysical implication, for irradiation of cells, tissue and finally animals for cancer therapy studies.
GSI, Darmstadt
RAS/INR, Moscow
ITEP, Moscow
In spring 2008 an irradiation test of superconducting magnet components was done at GSI Darmstadt in the frame of the FAIR project. Cave HHD with the beam dump of SIS synchrotron was used for irradiation. The irradiation set-up modeled a scenario of beam loss in a FAIR accelerator: U beam with energy of 1 GeV/u was used to irradiate a thin stainless steel bar at very small angle, so that the test samples situated behind the stainless steel bar were exposed to the beam of secondary particles created in the bar. The total number of U ions dumped on the target assembly was about 2·1014. Presently, in spring 2009 some samples are still radioactive. In the paper we present the estimates of the energy deposition and secondary particle fluences in the test samples and also discuss some results of the irradiation campaign.
GANIL, Caen
For the GANIL safety revaluation and the new project of accelerator SPIRAL 2, it was decided to replace the existing access control system for radiological controlled areas. These areas are all cyclotron rooms and experimental areas. The existing system is centralized around VME cards. Updating is becoming very problematic. The new UGA (access control unit) will be composed of a pair of PLC to ensure the safety of each room. It will be supplemented by a system UGB (radiological control unit) that will assure the radiological monitoring of the area concerned. This package will forbid access to a room where the radiological conditions are not sure and, conversely, will forbid the beam if there is a possibility of presence of a person. The study of the system is finished and the record of safety in preparation. At GANIL, the ions are accelerated by cyclotrons (C01 or C02, CSS1, CSS2, CIME) and are transported through beamlines towards the rooms of experiments (D1-D6, G1-G4). A first named extension SPIRAL was brought into service in 2000. It makes it possible to produce and post-accelerate, via the cyclotron CIME, the radioactive ion beams obtained by fragmentation of stable ions resulting from CSS2 in a carbon target. The project SPIRAL2 will arrive soon and has the same need in safety. Each room must thus remain confined (without human presence) when potentially dangerous ionizing radiations are present. This protection was identified as an important function for safety and is provided by EIS (Important Equipment for Safety). The EIS of GANIL are referred and described in the RGE (General Rules of Exploitation). It was decided to replace the current systems of security management by four distinct but interconnected systems.
IPNO/IN2P3/CNRS, Orsay
GANIL, Caen
SACM/IRFU/DSM/CEA, Gif-sur-Yvette
The SPIRAL2 facility at GANIL-Caen is now in its construction phase, with a project group including the participation of many French laboratories (CNRS, CEA) and international partners. The SPIRAL2 facility will be able to produce various accelerated beams at high intensities: 40 MeV Deuterons, 33 MeV Protons with intensity until 5mA and heavy ions with q/A=1/3 up to 14.5MeV/u until 1mA current. We will present the status of the beam dynamics studies recently performed for the high energy beam transport lines of the facility. Various studies were performed on beam-dump concerning beam dynamics, safety and thermo-mechanicals aspects. New experimental areas using stable beams and the cave dedicated to radioactive ion production will be presented according the scientific program.
CIAE, Beijing
Guangxi University, Nanning
Funding: Work supported by the NSAF (National Nature Science Fundation- China Academy of Engineering Physics Fundation) No.10576040.
236U is a long-lived radioactive isotope with a half-life of 2.342(3) ×107 a, which produced principally by thermal neutron capture on 235U. 236U is potentially applied in geological research and nuclear safeguards. Accelerator mass spectrometry (AMS) is presently the most sensitive technique for the measurement of 236U. A method for AMS measurement of long-lived heavy ion 236U was developed at CIAE with the set up the AMS dedicated injector and the newly proposed 208Pb16O2- molecular ions for the simulation of 236U ion transport. A sensitivity of lower than 10-10 has been achieved for isotopic ratio 236U/238U in present work.