JRA 1. LBT-DUSL Low background techniques for deep underground sciences • Reminder of goals • Present status • Work in progress ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 1
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. ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 2
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. ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 3
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 new techniques 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. ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 4
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 purification techniques to improve the radio-purity of materials. ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 5
Management structure of JRA 1 Activity coordinator Deputy coordinator Julio Morales/José M. Carmona (LSC) Nicola Ferrari (LNGS) WP 1. Background measurements in the deep underground sites: Coordinator Nicola Ferrari (LNGS) Deputy coordinators Marisa Sarsa/Gloria Luzón (LSC) WP 2. Background simulations: Coordinator Gloria Luzón/Susana Cebrián (LSC) Deputy coordinator Vitaly Kudriavtsev (IUS) WP 3. Low background facilities: Coordinator Matthias Laubenstein (LNGS) Deputy coordinator Jean Louis Reyss (LSM) WP 4. Radiopurity of the materials: Coordinator: Deputy coordinator: Pia Loaiza (LSM) Lino Miramonti (LNGS) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 6
Participants WP LNGS LSM WP 1 - Background measurements and monitoring in the deep underground sites N. Ferrari A. Ianni C. Broggini C. Cattadori W. Plastino C. Vignoli G. L. Raselli A. Cesana J. Kisiel G. Gerbier D. Lalanne G. Luzon J. M. Carmona J. Morales M. L. Sarsa A. Ortiz J. Ruz V. Kudryavtsev J. Mc. Millan J. Lewin B. Camanzi E. Tziaferi WP 2 - Background simulations L. Pandola S. Parlati P. Loaiza G. Gerbier M. De Jesus F. Piquemal S. Cebrián G. Luzon J. M. Carmona M. Martinez B. Beltran V. Kudryavtsev J. Davies B. Camanzi C. Bungau WP 3 - Low background facilities M. Laubenstein N. Ferrari C. Tomei M. Balata S. Shoenert H. Simgen J. L. Reyss Ph. Hubert D. Lalanne J. A. Villar J. Amare M. L. Sarsa J. M. Carmona M. Martinez J. Ruz S. Paling R. Luscher N. Smith C. Bungau J. Mc. Millan WP 4 - Radiopurity of the materials L. Miramonti A. Ianni B. Caccianiga M. Laubenstein C. Tomei J. Kisiel P. Loaiza C. Goldbach P. Hubert R Gurriaran C. Marquet J. Puimedon M. L. Sarsa J. M. Carmona L. Torres S. Paling J. Mc. Millan J. Lewin B. Camanzi ILIAS 4 EB meeting. Paris. January 2005 LSC Boulby JRA 1 web page http: //www. unizar. es/ilias 7
First JRA 1 General Meeting Held on September 10, 2004 in Edinburgh Main conclusions: n n Set-up of Working Groups Coordinators of each WP will collect information from every laboratory about Plans of measurements (WP 1) Simulation activities of each group (WP 2) Status of low background facilities (WP 3) Data of activity of the materials (WP 4) n n This information will be used to elaborate the Mid-term report Information will be updated at http//www. unizar. es/ilias (WP 1, WP 2, WP 3) and http: //www-lsm. in 2 p 3. fr/ilias. html (WP 4) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 8
Mid-term report Already sent (see http: //www. unizar. es/ilias and the ILIAS webpage) What we have learned: n Not all contributions arrived in due time n Not all labs sent their economical information n We received information: sometimes from the lab about its activities on each WP sometimes from the coordinator of a WP about activities related to the WP in all labs ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 9
WP 1 activities (Background measurements in the deep underground sites) Tasks for 1 st semester • Collecting existing data • Planning new measurements • Gamma-ray: set-up instrumentation (start) • Neutrons: set-up instrumentation (start) Tasks for 2 nd semester • Gamma-ray: set-up instrumentation (cont. ) • Neutrons: set-up instrumentation (cont. ) • Set-up of upgraded Radon monitoring systems (start) • Full survey of background components (start) • Data analysis and interpretation (start) • Implementation of results in database (start) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 10
WP 2 activities (Background simulations) Tasks for 1 st semester • Existing codes compared and discussed Tasks for 2 nd semester • Platform, language and structure of the library fixed • First ‘test’ version of Monte-Carlo libraries ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 11
WP 3 activities (Low background facilities) Tasks for 1 st semester • Preparation of areas hosting new ULB facilities Tasks for 2 nd semester • Implementation of different facilities at each underground lab (start) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 12
WP 4 activities (Radiopurity of the materials) Tasks for 1 st semester • Collecting existing data into de database (start) • Defining new measurements (start) Tasks for 2 nd semester • Collecting existing data into de database (cont. ) • Defining new measurements (cont. ) • Measurements of radio-purity of new materials (start) • R&D on purification techniques (start) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 13
JRA 1: status of the activity The official web page of the JRA 1 activity has been setup. It contains: n n A description of the JRA 1 activity and general documents JRA 1 list of participants Information on next and previous meetings Working group pages: participants, documents, evolution of the activities… http: //www. unizar. es/ilias ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 14
ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 15
ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 16
ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 17
WP´s activities ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 18
WP 1 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 WP 1 coordinator • Prepare contents for WP 1 web page to be located on the main web page of JRA 1 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, ---) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 19
WP 1 activities (Background measurements in the deep underground sites) • 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 3 He liquid scintillator detector • The same measurements will follows for other labs (TARI) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 20
WP 2 activities (Background simulations) Completed & undergoing activities • At IDM 04 a joint meeting of N 3 BSNS and JRA 1 WP 2 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 JRA 1 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 ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 21
WP 3 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 JRA 1 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. ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 22
WP 4 activities (Radio-purity of the materials) Completed & undergoing activities • A web page (http: //www-lsm. in 2 p 3. fr/ilias. html) has been set-up to contain a data base on radio-purity of materials. It will be linked to the JRA 1 main site. Type Provider and Ref Type of detector Material Measured by • Coordinators from each lab will collect data from measured materials Radionuclide concentration in dpm/kg 238 U OFHC VA 0010563 Ge, type n, 200 cc @ LSM Cooper EDELWEISS 234 Th series 214 Pb < 0. 3 ILIAS 4 EB meeting. Paris. January 2005 214 Bi 232 Th 228 Ac <0. 12 series 212 Pb 208 Tl 235 U 210 Pb 137 Cs 40 K 60 Co <0. 3 <0. 2 57 Co 54 Mn 0. 03 ± 0. 001 0. 01 ± 0. 0009 JRA 1 web page http: //www. unizar. es/ilias 23
2 d JRA 1 General Meeting Held on January 12, 2005, hosted by LSM (Modane) Main conclusions: n n All the Working groups are operatives (and in time) Coordinators of each WP have collected information from every laboratory about Status of the measurements (WP 1) Simulation activities of each group (WP 2) Status of low background facilities (WP 3) Collection of Data of activity of the materials (WP 4) n n This information will be used to elaborate the First year report Information will be updated next week at http//www. unizar. es/ilias (WP 1, WP 2, WP 3) and http: //www-lsm. in 2 p 3. fr/ilias. html (WP 4) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 24
WP 1 activities (Background measurements in the deep underground sites) Completed & undergoing activities • Environmental gamma background in the labs & MC to estimate absolute gamma-ray fluxes, tests • (portable Ge’s, 3”x 3” Na. I, 5”x 5” BGO detectors) • Radio purity of rock & concrete in all the labs done • Radio purity of the rock in the Gran Sasso massive (TARI) • Radon monitoring in air (all the labs) and water • • • (from 5 Bq/m 3 (Bo) to <150 Bq/m 3) since various years Rn trapping facility at LSM (Sept 04) 15 m. Bq/m 3 muon fluxes in all the labs • (from 0, 2 (M) to 7, 2 (C) m-2 h-1) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 25
• neutron monitoring projects & measurements Liquid Scintillator cells at LNGS 6 Li doped Liquid Scintillator at LSM Gd loaded scintillator detector started in Nov 04 at Boulby Indirect estimates from IGEX results at LSC ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 26
ILIAS JRA 1 meeting – Modane Rate (cps/ke. V) (2) Ge portable detector Energy (ke. V) Hall B Hall C OPERA BOX 10 cm Pb shielding … Other measurements performed in Hall B and Hall A by J. Kisiel 27
WP 1. 2 New Neutron Measurements at Boulby A new detector has been built using Gd doped liquid scintillator viewed by two low background PMTs. Now installed underground in a dedicated low background lead and copper castle. Data is currently being acquired and preliminary results are expected in 1 -2 months. 29
Radon trapping facility Radon purification by adsorption in charcoal Time during which radon is trapped in the « filter » : Tr = K(T) M / Q K(T) : dynamic adsorption coeff. M : charcoal mass Q : Air rate 2 charcoal towers : T 1 = -53 C, T 2 = -45 C M = 2 x 450 kg Vol. clean air : 150 m 3/h Activity 222 Rn = 15 m. Bq/m 3 30
WP 2 activities (Background simulations) Completed & undergoing activities • A second joint meeting of N 3 BSNS and JRA 1 WP 2 activities was held, and work by every group presented and discussed • Comparison of experimental results (neutrons , muons, gamma flux. . ) has been reported • Comparison & modification of codes has been reported • The platform, language and structure of the library is under discussion • First set of MC codes for relevant background components and instrumentation (alpha, beta and gamma, muons and neutrons and other codes has been defined • 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 JRA 1 web page has been created (info: jcarmona@unizar. es) ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 31
Special Cross-links JRA 1 -WP 2 Development of a standard library of background simulation codes N 3 -BSNS Background Simulation, Neutron-Shield and Muon-Vetos JRA 2(IDEA) WP 3 -B 1 Study on Cosmogenic Induced Activity 32
WP 3 activities (Low background facilities) • A very impressive development and strengthening of the ultra low-level background facilities at LNGS is under way • Great progress has recently been made in the new ULBF laboratory at Boulby. The Ge detector set-up will be upgraded after the completion of the laboratory infrastructure • Improvement of the IRIS, 400 cc, low background Ge detector, the installation of a new planar Ge detector and the set-up of the Cryogenerators is on-going at LSM. The construction of a Radon precision • measuring facility, with a sensitivity of ~ m. Bq/m 3 (vol. 70 l) is projected. • Two new ULB Ge detectors for material testing will be installed in the LSC ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 33
Development and strengthening of the ultra low-level background facilities (LNGS) Ø Extension of the Low Level Laboratory at LNGS Ø Development of new generation of HP-Ge detectors for ultra low-level applications Ø Set-up of ultra low-level scintillation counter systems Ø Ultra low-level gas counting (GNO counting lab) GNO Ultra low-level gas counting Ultra low-level HPGe detector @ LNGS 34
Low Background Facility at Boulby 5. 6 Desk GE 1 AC unit GE 2 Storage 7. 68 m Small Proj Bay 11. 96 m GE 3 0. 8 m 0. 5 T swing crane (in place) Desk 4. 28 m GE 4 Entrance Clean-Off Storage 6. 0 m Storage Plan for JIF Low Background Lab (Stub A) 6. 0 m 35
On-going projects at the LSM • Improvement of a low background Ge detector (IRIS, 400 cc). Prospective construction materials are being measured. Monte Carlo simulations are performed to get the distinct contribution to the background from the assembly materials and to determine the maximum acceptable radioactivities in order to get an improvement of a factor 5 in the detector background. We’ve found a high Th activity (0. 13 Bq/kg @ 238 ke. V) in one of the insulators near the crystal, which need to be replaced by other material. 36
WP 4 activities (Radiopurity of the materials) • The database is stored in a dedicated server of the Centre de Calcul de Lyon. It is built using My. SQL system combined with php scripts which allow to communicate from the web page to the database. • http: //www-lsm. in 2 p 3. fr/ilias/database. html • Till now, data has been collected from LSC (ANAIS, CAST & ROSEBUD) & LSM (EDELWEISS) • At LRT 2004, SNO people proposed to make their measurements available to be included in the database. • Systematic comparison of measurements in the different labs: cross-check with one or more reference samples to compare instrumentation and possible systematic in the analysis method is under discussion ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 37
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INFN used money (Sept-04) Expected cost before Apr 2005 ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 39
LSC used money (Sept-04) Expected cost before Apr 2005 ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 40
LSM expected cost before Apr 2005 Total available CEA+CNRS : 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€ ILIAS 4 EB meeting. Paris. January 2005 JRA 1 web page http: //www. unizar. es/ilias 41
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