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JRA1. LBT-DUSL Low background techniques for deep underground sciences. Present status Work in progress. Key objectives. WP 1.

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  1. JRA1. LBT-DUSL Low background techniques for deep underground sciences • Present status • Work in progress

  2. Key objectives WP 1. To measure the environmental background components (neutrons, gammas, muons, Rn contamination in the air and in the water ...) in the four underground sites in a coherent and coordinated way. The joint research effort should optimise the know-how of the different participants. This is extremely important for the interpretation of data and for planning future experiments.

  3. Key objectives WP 2. To produce a reliable Monte Carlo library of simulation codes to identify and quantify the backgrounds in the EU underground sites in a variety of experimental conditions for the interpretation of data and for planning future experiments. The joint research effort should optimise the know-how of the different participants. Experimental results from Task 1 will be useful as the input of the simulations.

  4. Key objectives WP 3. • Construction and upgrading of ultra low background facilities (ULBF) in the four underground labs forming an EU-coordinated service for applications in rare event physics and other fields of world-wide value. • Implementation of newtechniques to deal with the background: active and passive shielding, veto systems, particle discrimination techniques, fragmentation of calorimeter detectors, control and suppression of radon levels... • Study of the feasibility of fabrication of detectors and materials underground.

  5. Key objectives WP 4. • Collect new (and old) data on radioactive contamination and cosmogenic activation of materials used in rare-event physics experiments and ultra-low background instrumentation, using the new capabilities offered by the R&D and facilities of WP 3. • Development and test of purificationtechniques to improve the radio-purity of materials.

  6. Activity coordinator Julio Morales/José M. Carmona (LSC) Deputy coordinatorNicola Ferrari (LNGS) WP1. Background measurements in the deep underground sites: Coordinator Nicola Ferrari (LNGS) Deputy coordinators Marisa Sarsa/Gloria Luzón (LSC) WP2. Background simulations: Coordinator Gloria Luzón/Susana Cebrián (LSC) Deputy coordinator Vitaly Kudriavtsev (IUS) WP3. Low background facilities: Coordinator Matthias Laubenstein (LNGS) Deputy coordinator Jean Louis Reyss (LSM) WP4 . Radiopurity of the materials: Coordinator: Pia Loaiza (LSM) Deputy coordinator:Lino Miramonti (LNGS) Management structure of JRA1

  7. Participants

  8. Held in September 10, in Edinburgh Participants: LNGS Nicola Ferrari, Claudia Tomei, Lino Miramonti, Matthias Laubenstein IUS Neil Spooner, Vitaly Kudryavtsev, Alex Murphy LSM Gilles Gerbier, Pia Loaiza LSC Julio Morales, José Manuel Carmona, Gloria Luzón, Susana Cebrián, María Martínez, Lidia Torres, Igor G. Irastorza Review of JRA1 goals WP presentations by coordinators of the activities Set-up of the working groups Review of present status of the JRA1 activities Review of the goals for each WP Proposed actions First JRA1 General Meeting

  9. The official web page of the JRA1 activity has been set-up. It contains: A description of the JRA1 activity and general documents JRA1 list of participants Information on next and previous meetings Working group pages: participants, documents, evolution of the activities… JRA1: status of the activity http://www.unizar.es/ilias

  10. WP´s activities

  11. WP1 activities(Background measurements in the deep underground sites) •  Completed & undergoing activities • Collecting existing data from each laboratory on • neutron background, environmental gammas, radio purity of rock, concrete, etc…, radon monitoring (in air, water, …), muon fluxes • Reports on these measurements are being collected by WP1 coordinator • Prepare contents for WP1 web page to be located on the main web page of JRA1 at LSC • Survey of environmental gamma-ray background (all labs; undergoing at LNGS, and Boulby with TARI project) • Measurement of radiopurity of rock, concrete, etc... (all labs; undergoing at LNGS, LSC, ---)

  12. WP1 activities(Background measurements in the deep underground sites) • Collecting existing data from each laboratory on • neutron background, environmental gammas, radio purity of rock, concrete, etc…, radon monitoring (in air, water, …), muon fluxes • Rn monitoring in the air and water (ongoing since a few years at LNGS; soon at LSM, LSC, IUS) • Neutron monitoring at the underground laboratories • At LNGS a new measurement will be started by a Pavia INFN group in the next months • A group from Baksan is interested to start a collaboration with ILIAS for the measurement of neutron backgrounds with 3He liquid scintillator detector • The same measurements will follows for other labs (TARI)

  13. WP2 activities(Background simulations) • Completed & undergoing activities • At IDM04 a joint meeting of N3 BSNS and JRA1 WP2 activities was held, and work by every group presented and discussed • A mailing distribution list has been created to optimize exchange of ideas (info: http://webmail.unizar.es/mailman/listinfo/montecarlo) • An FTP repository for codes with (restricted) access through main JRA1 web page has been created (info: jcarmona@unizar.es) • Groups have been asked by WP coordinators to elaborate a report on the simulation codes they are using (comments, …) • Next projects • Comparison of codes; problems, bug and open questions detected • Preparation of a first set of Monte Carlo libraries for background simulations • Design of strategies to compare results with experimental data

  14. WP3 activities(Low background facilities) • Completed & undergoing activities • LNGS operates very low background Ge detectors developed by a collaboration between MPI and Canberra • A facility for electroforming copper at LSC is under development • Reports on low background facilities at each underground laboratory are in preparation • The laboratory for low-level radioactivity measurements at LNGS was presented by M. Laubenstein (see JRA1 web page) • Next projects • To initiate the development of ultra-low background detectors, with the establishment of a prototype for the growth of detector crystals • A program of cross calibration of the Ge detectors in the different labs is under consideration through an exchange of reference materials. The consistency of data on radioactive contamination obtained by the different labs will then be checked.

  15. Material Type Provider and Ref Radionuclide concentration in dpm/kg Type of detector Measured by 238U series 232Th series 234Th 214Pb 214Bi 228Ac 212Pb 208Tl 235U 210Pb 137Cs 40K 60Co 57Co 54Mn Ge, type n, 200 cc @ LSM Cooper OFHC VA 0010563 < 0.3 <0.12 <0.3 <0.2 0.03 ± 0.01 0.001 ± 0.0009 EDELWEISS WP4 activities(Radio-purity of the materials) • Completed & undergoing activities • A web page (http://www-lsm.in2p3.fr/ilias/ilias.html) has been set-up to contain a data base on radio-purity of materials. It will be linked to the JRA1 main site. • Coordinators from each lab will collect data from measured materials

  16. INFN used money (Sept-04) Expected cost before Apr 2005

  17. LSC used money (Sept-04) Expected cost before Apr 2005

  18. LSM expected cost before Apr 2005 • Total available CEA+CNRS : 129 k€ • Projected expenses : 129 k€ • post doc 30 k€ • support for one tech 11 k€ • equipment to buy : • anti-radon system (can be done asap if OK) 42 k€ • planar Germanium 24 k€ • consumables (electronics, acquisition...) 16 k€ • T&S (about 15 travels of .4 k€ in France and out) 6 k€

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