06 Beam Instrumentation and Feedback
T18 Radiation Monitoring and Safety
Paper Title Page
WEPC163 A New Embedded Radiation Monitor System for Dosimetry at the European XFEL 2364
 
  • F. Schmidt-Föhre, D. Nölle, R. Susen, K. Wittenburg
    DESY, Hamburg, Germany
  • L. Fröhlich
    ELETTRA, Basovizza, Italy
 
  The upcoming European XFEL will be built at a length of approx. 3.4 km between the campus of the Deutsches Elektronen-Synchrotron DESY at Hamburg and Schenefeld at Schleswig-Holstein for commissioning in 2015. The XFEL utilizes various electronic systems for machine control, diagnostics and safety. To achieve a cheap and compact accelerator construction, the beam pipe and its nearby electronic supply systems are located inside the same tunnel, charged by an evident amount of radiation in certain sections of the XFEL. To insure the lifecycle and function of electronics and magnetic structures like undulators in these XFEL radiation fields, all electronic systems located inside the tunnel will be sufficiently shielded according to pre-estimated radiation levels. In addition, these electronics and the undulator parts will be monitored for the impact of Gamma- and Neutron-radiation by a new versatile and compact radiation monitor system. It measures the accumulated dose in the electronic cabinets along the XFEL to ensure an exchange of radiated parts before significant radiation damage occurs. First prototype measurements at different radiation sources will be presented.  
 
WEPC164 First Operation of a Fiber Beam Loss Monitor at the SACLA FEL 2367
 
  • X.-M. Maréchal, T. Itoga
    JASRI/SPring-8, Sayo-gun, Japan
  • Y. Asano
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
 
  A fiber-based Cerenkov beam loss monitor (CBLM) has been developed as a quick and long-range detection tool for radiation safety at the X-ray FEL SACLA (SPring-8 angstrom compact free electron laser) to minimize electron beam losses. Based on tests carried out at the 250 MeV SPring-8 Compact SASE Source facility, large core (400 μm), long (>120 m) multimode fibers were selected and installed in the undulator section of SACLA. We report on the first few months of operation of the CBLM. During the commissioning of the X-FEL, the CBLM has performed effectively, with a detection limit below 10 pC per pulse across the 110 meters of the in-vacuum undulators, and with a position accuracy of less than 2 m. Experimental results are presented along with detailed numerical studies including the geometry of in-vacuum insertion devices, and discussed.  
 
WEPC165 Monte Carlo Simulation of the Total Dose Distribution around the 12 MeV UPC Race-track Microtron and Radiation Shielding Calculations 2370
 
  • C. de la Fuente, M.A. Duch, Yu.A. Kubyshin
    UPC, Barcelona, Spain
  • V.I. Shvedunov
    MSU, Moscow, Russia
 
  The Technical University of Catalonia is building a miniature 12 MeV electron race-track microtron for medical applications. In the paper we study the leakage radiation caused by beam losses inside the accelerator head, as well as the bremstrahlung radiation produced by the primary beam in the commissioning setting. Results of Monte Carlo simulations using the PENELOPE code are presented and two shielding schemes, global and local, are studied. The obtained shielding parameters are compared with estimates based on international recommendations of the radiation safety standards.  
 
WEPC166 Licensing and Safety Issues of the ESS Accelerator 2373
 
  • P.E.T. Jacobsson, M. Brandin, D. Ene, T. Hansson
    ESS, Lund, Sweden
 
  The licensing process for the European Spallation Source (ESS) has started up. The process includes both an application to the Environmental Court in Sweden as well as the application towards the Swedish Radiation Protection Authority (SSM). The applications will be based on an Environmental Impact Assessment EIA) and a Safety Analysis Report (SAR). One important step has been to define which regulations that apply for ESS. ESS has also set up General Safety Objectives (GSO). Based on the GSO and the legal requirements, the process design of the whole ESS facility is ongoing. This paper will focus upon the radiation safety issues related to the accelerator. This includes items as radiation shielding, personal protection system and operation emissions. Analyses and calculations, based on a preliminary design and layout of the ESS accelerator, will be presented. Discussion is made on issues like shielding material, shielding design and analysis models.