Principle Investigators Priscilla Cushman (University of Minnesota)

1. Assay and Acquisition of Radiopure Materials Principle Investigators Priscilla Cushman (University of Minnesota) Dongming Mei (University of South Dakota) Kara Keeter (Black Hills State University) Richard Schnee (Syracuse University) Engineering Consortium CNA Consulting Engineers (Lee Petersen) Dunham Associates Miller Dunwiddie Architecture, Inc • Characterize radon, neutron, gamma, and alpha/beta backgrounds at Homestake • Develop a conceptual design for a common, dedicated facility for low background counting and other assay techniques. • Assist where appropriate in the creation of common infrastructure required to perform low background experiments. • Perform targeted R&D for ultra-sensitive screening and water shielding

2. Structure of AARM S4 Process Conventional Design of the Facility for AARM by Engineering Consortium Based on Information from the Users (YOU!) Gleaned and organized by the Co-PIs YOU are represented by the following “AARM Scientific Collaboration” who has already given feedback, but must continue to provide information as the process evolves. Scientific Collaboration Craig Aalseth Henning Back Tim Classen Jodi Cooley-Sekula Yuri Efremenko Reyco HenningJeff MartoffRobert McTaggartEsther MintzerTullis Onstott Andreas Piepke Andrew Sonnenshein John Wilkerson

3. Integrate Effort with European Labs The Synergy Workshops and Integrative Website were dropped: budget 1.3M  1.0M (linking research fields and linking multiple sites) Same thing happened in ILIAS Next process via reviewer comments ** Difficult to fund interdisciplinary projects ** But, we will still draw heavily from expertise in existing Low Background Facilities via International Scientific Advisory Panel Laura Baudis (Zurich University)Richard Ford (Queen’s University, SNOLab) Gilles Gerbier (CEA Saclay)Gerd Heusser (Max Planck Institute, Heidelberg) Andrea Giuliani (University of Insubria (Como), Coordinator of ILIAS Continuation)Mikael Hult (European Commission: JRC Inst. for Reference materials and Measurements) Vitaly Kudryavtsev (University of Sheffield)Pia Loaiza (Laboratoire Souterrain de Modane) Matthias Laubenstein (INFN, Gran Sasso Laboratory)Neil Spooner (University of Sheffield)

4. Why do we need an LBCF? Why do we need a common Low Background Facility? • Cost effective sharing of resources, close to experiments • Unified scheduling tools and infrastructure will streamline counting and match users to the sensitivity and modality needed. • Common materials database and shared experience • Electronics pool, code repository, unified analysis system • Expert Technicians and Training center • can become a center for new R&D in screening and assay develops new field of low background techniques • Large enough to include on site clean machine shop, chemical services, radon-free storage and assembly areas, common shielding and shielding elements available

5. Why do we need other sites as well? Urgency of screening:DUSEL experiments need to begin screening NOW Design parameters are determined in part by material selection Prototypes are being built now Sanford is not yet up to speed, Multiple sites can help Economy of scale only goes so far Experiments are designed and built at local institutionsLocal on-site analysis/screening inexpensive access, quick turn-around, student training Cooperative agreements with local industry, accelerators, commercial labscan generate user fees and foster synergies with other fields Some specialty users may prefer a different sitee.g. high security, different rock or bugs, different bkgds There are no resources in the S4 to unify and facilitate multiple sitesCan we identify funding source(s) to create Training Centers at existing sites (Kimballton, WIPP, Soudan, Oroville) Establish loan programs and jump start purchases of detectors the will eventually be part of the DUSEL AARM system?

6. Points of Contact, Meeting Summary We have filled out the docs contact form Spokesperson: P. Cushman AARM Engineer: L. Petersen EH&S Contact: K. Keeter E&O Coordinator: C. Keller Liaison Engineer: S. Marks Liaison Scientist: Y-D Chan Met with about 10 members of the AARM Scientific Collaboration plus Dave Plate and Steve Marks Firmed up plans for FAARM design and determined locationDiscussed interface between AARM, Facilities, and the Experiments New floor plan will be distributed in 2 weeks, need feedback in a monthRecast our “Program Infrastructure” spreadsheet into official docs form (2 weeks)

7. Facility for AARM (FAARM) Staged approach to cleanliness and shielding Class 2000 clean room & Rn mitigation throughout. Additional separate Class 100 (or 500) clean rooms (sample handling, assembly) Shielded room with easy access Additional shielding for screeners, Special water shield for sensitive applications. Veto shield for the most sensitive applications and for Prototypes (e.g. dark matter)

8. 4850 level = Facility for AARM (FAARM) g,b,a screening and support infrastructure rendered images from CNA Engineering

9. Facility for AARM (FAARM) Refinement of Design New plan will be drawn, including first pass at sensitivities for each screener Distribute to AARM Collaboration and all S4 PIwhich labeled screeners will you use and for how long? Typical use of clean room, storage needs, machining needs Protoyping? Ultra-sensitive screening type, size, sensitivity.

10. Confirmed 4850 level • 4850-ft level • deep enough for ultra sensitive screening and dark matter prototype testing • close to experiments for easy access (drive in large items) • share water purification and cryogen infrastructure • Open Questions tend to be about duplication with facilities or experiments • Location and commonality of Water Purification and Cryogen system • Nitrogen liquifier and distribution system? !st stage of water purification for shield Radon mitigation for the whole lab or just for us? Additional Cu Electroforming probably required timescale of handing over the Majorana facility

11. Confirmed 4850 levelDefine overall size and location Standard Lab Modules Yates Shaft Existing Drifts Small Lab Module FAARM Project Scope (LM) Project Scope (LC) Davis Cavern Expt New Drifts at 4850L Large Cavity 1 Staging Area New Winze New Bypass Drift and Large Cavity Utility Area at 4850L New Drift to 5040L Ross Shaft #6 Winze

12. Confirmed 4850 levelLocated at back of Module 2 Emergency Egress Shielded Clean Prototyping Assembly New Winze Expt Main Entrance

13. Water Shield Design Modular, stackable containers vs Steel frame support vs custom wall We will move ahead quickly on vendor quotes Simulation of thickness and sensitivity requirements still needs to be done properly, but General consensus that we go for the gamma reduction as well as the rock radioactivity  3 m water e.g. commercial vendor Dufrane Nucear Shieding

14. Ultra-sensitive Immersion Tank It is there because it needs to be! Goal: 10-13 – 10-14 g/g U/Th Ideas, but no existence proof yet – include only a footprint for April 2010 Identity Crisis I. A very pure water shield into which we put several high sensitivity screeners or even whole prototype experiments (e.g. high pressure Xe or …?) or II. A Sensitive Detector into which we dip large items that need whole body counting LUX water tank may be available for purpose I at the right timescale but we need to plan our requirements – let Facilities integrate Need both applications eventually Explore a double tank or concentric tank solution more real estate required…

15. Other levels are also part of AARM 800’ level Storage of Materials (overburden and radon-free) copper, lead, small components Pre-screeners and NAA gamma counters Radiochemistry labs for NAA Chemical Assay and/or Cu Electroforming Coordinate with Majorana (e.g. might be at 4850’) Define Surface Facilities NAA receiving Later additions may include ICPMS, Surface Characterization Lab (PIXE, SIMS, RBS, Auger …)

16. Milestones for the AARM Cooperative Agreement Site Characterization and Simulation Studies

17. Milestones for the AARM Cooperative Agreement Determining the parameters of the FAARM

18. Milestones for the AARM Cooperative Agreement Translating this into a Conceptual Design