low background counting facility at henderson dusel lots of resources already exist, e.g. 1....
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Low Background Counting Facility at Henderson DUSEL
Lots of resources already exist, e.g.
1. Homestake NUSL Reference Design Report WBS 6.1 (Low-level counting facility)2. NUSL White Paper (Nico, Piepke, Shutt)
Lots of experience with ultra-sensitive low-level experiments, e.g.
Borexino and the Counting Test Facility (Gran Sasso)
SNO experiment
BUT not much experience in low background user facilities
Funding agencies and Historical Precedent lead to each experiment providing its own screening and purity methods
Europe is ahead in organization (ILIAS)
And in sites/experiments which are lending out their “old” facilities
A Suite of Devices with varying degrees of cleanliness + sensitivity
Ultra-low bkgd: Emphasize sensitivity
At least one state-of-the-art “whole body” facility 10-13-10-15 g/g 238U/232Thmultiple ports and flexible staging
Leaching/emanation lab 10-12 g/g Space for the next generation 10-16 – 10-17 g/gNovel techniques e.g. HPGe in LN (a la GERDA) 10-12 g/g ?
Traditional low-bkgd counting techniques Emphasize throughput.
HPGe with low bkgd shielding and cryostats 10-9 g/gextending to 10-12 g/g with NAA
Tracking MWPCs for surface beta, alpha Proportional counters for single atom counting of gas samples
Pre-screeners
NaI, less sensitive HPGe, Radon monitors,
Any DUSEL installation of a full-fledged LBC Facility consists of
PLUS
Plus the infra-structure to support them
Dedicated staff + offices for analysis
Sample preparationUnderground prep and storageSurface prep and chem lab (including radiochem for NAA)
Clean rooms & Radon mitigation & Clean Machining & Washing Station
Underground fabrication & utilitiesElectroformed copper for cryostats and shieldingDetector assemblyProvide Radon-free air, N2, and LNUltra-pure water, ultra-pure liquid scintillator
Optional Extensions include
Secure Lab for sensitive (of a different sort!) applications
Shielded Prototyping space
Any DUSEL installation of a full-fledged LBC Facility consists of
Figure E-16 from the Homestake Reference Design
Secure lab
Emanation and leachinglaboratory
(TBA) Pool 2Gd-loaded liq. Scint
for neutron sensitivity or
Mini-Borexino for U/Th down to 10-16 g/g
Pool 112 m cube – ultra-pure water
NAA Laboratory + general environmental sample handling
Built-in liq. Scint acrylic thimble ports read out by PMT’s
for U/Th down to 10-14 g/g
Matthias Laubenstein (Borexino)Talk at Synergies Workshop
CTF can lead the way to the next generation ultra-sensitive whole body assay technique
Nonetheless, Henderson needs to make some choices
Actual Layout:
SnoLab model or Nested clean areas or Simple TreeMultiple screening depths? Or staged downward trend?
Accessibility
Outreach and TouristsNational SecurityQuality of Life for shift-takers
Degree of Centralization
Model 1: Complementarity with existing sites Exploit Deep Site characteristics
Model 2: Include all possible facilitiesExploit economy of scale
Degree of Availability
Provide screening and assay to the general public?Only to DUSEL participants?Only to the experiment that “owns” the equipment?
DUSEL LBCF does not have to re-invent the wheelExisting counting facilities in the US
Best technique may not be “counting” ICPMS, AMS ($$)RBS, PIXE, Auger, SIMS
Analysis centers at most Universities User fees – cheaper for University faculty
Commercial LabsLonger turn around, more expensive, more standardized
“Use for Others” at most national labs (Oak Ridge, LANL, BNL)
A few shallow middle depth sites open for usersLBL Bldg72 and Oroville Dam – nowLOMO at PNNL - soon
Underground screening sites in development stage, with some capacity nowWIPP: SEGA running, MEGA/EXO installing
Infrastructure thru LANL.
Soudan: MINOS/CDMS running -screening capability in SOLO Protyping facility with active muon veto shield
Kimballton: LENS experiment slated for hereTies to NRL. Possible Nat’l Security niche
• Screening for existing experiments (and security-related appl.)
• Underground testing of prototypes for DUSEL technology choices
• Screening for the proposed experiments
• Development of new, high purity materials
• R&D now for a future DUSEL LBCF
What needs to be done NOW? The DUSEL sites have a vested interest in this
so… How does HUSEP become involved?
Open for use:40’ x 30’ x 100’ surrounded by active muon veto shield.
Office space and infrastructure exists
Existing Underground Infrastructure should be Utilized in an Organized Way
WIPPSoudan
Solution
Propose NOW a multi-site LBCF with proper integration and enough throughput to deal with mounting screening and purity issues
Part of this is just building the community and consensus
It has already started with
Meetings
Collaboration
DUSEL Solicitation 1
LRT 1st Topical Workshop: Sudbury, Canada. December 2004 2nd Topical Workshop: September 30 - October 3, 2006 - Aussois, FRANCE
Synergies Workshop: Minneapolis, MN. July 2005
European: ILIAS already exists.
North American: Integration Website (input from Synergies Workshop)
Integrative WebsiteWorking toward a cooperative approach to sensitive radiation techniques and low background counting
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PURPOSE
1. Institutions with at least some capacity to serve users will be featured, along with the detectors, sensitivities and support facilities available. This should bring some order to the diverse array of solutions and provide users with means to schedule their research needs.
2. Diverse research fields will be able to learn from each other and create collaborations based on low radioactivity techniques they may have in common by exploring this site. Links to the workshop talks will be a first step since the talks will be given by representatives of the various disciplines, surveying the ways in which they currently use these techniques and how they might benefit from improved sensitivity in the future.
To participate in the creation of this community, first register as a member (see bottom left sidebar). You will be sent a member id number which you can use to add resource links, edit your contact information and add functionality to this website. Once you have your id, login by clicking on the "Add to Website" link on the sidebar to the left.
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Underground Sites
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Schedule a Sample•To schedule a sample, check the available detectors and click here to submit your request.
What's Available?•HPGe •Alpha counting •Beta counting
Waste Isolation Pilot Plant(WIPP)
WIPP offers its mine operations infrastructure and space in the underground to researchers requiring a deep underground setting with dry conditions and very low levels of naturally occurring radioactive materials.
Soudan Underground Mine
Soudan Low Background Counting Facility has an active muon veto shield covering an area of 35ft x 40th x 100ft.
Kimballton The Kimballton site is located less than 30 minutes from Virginia Tech
Sudbury Neutrino Observatory
SNO provides 6010 Meters Water Equivalent(MWE) of shielding from cosmic rays and offers a uniquely low background environment for the next generation of experiments exploring the frontiers of particle physics and astrophysics.
LBL Berkeley Lab: Shielded surface facility and Oroville Dam
PNNLPacific Northwest National Lab: Shielded surface and Lower Monumental Dam
North American Research Facilities
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FirstName = Priscilla LastName = Cushman
email = [email protected] Title = Professor of Physics
Affiliation = University of Minnesota Webpage = www.hep.umn.edu/~prisca
Address = School of Physics and Astronomy Address2 = 116 Church St SE
City = Minneapolis Province/State = MN
Country = USA Phone = 612-626-8917
Fax = 612-624-4578 ResearchField = HEP
ResearchTechniques = HPGe, beta screening, surface techniques ResearchProjects = CDMS (Cryogenic Dark Matter Search)
Member Profile for [email protected]
Current Contact Information for Professor of Physics Priscilla Cushman: