Transcript Low Background Counting, Materials Purity, Radon issue Prisca Cushman University of Minnesota Not LBC… New Name? AALRMS Assay and Acquisition of Low Radiation Materials and.

Low Background Counting, Materials Purity, Radon issue
Prisca Cushman
University of Minnesota
Not LBC… New Name?
AALRMS
Assay and Acquisition of Low Radiation Materials and Space
N.B. NOT yet approved by the Working Group
Cross-cutting Group of about 20 drawn from
Dark Matter
Neutrinoless Double Beta Decay
Solar Neutrinos
Energetic Particles
Also met with 1-km vertical space NNBAR (neutron monitoring, NAA)
Nuclear Astrophysics (neutron backgrounds)
Contacted (future integration) with
E&O, Geomicrobiology, PODDS, radiometric analysis,
Induced Flow-Transport-Activity, Cosmic ray imaging
S4 Vision for the Low Background and Materials Purity Group
http://zzz.physics.umn.edu/lowrad
DUSEL must have world class facilities
capable of providing assay and ultra-clean materials support for ISE
local staff with the requisite expertise.
lead and direct future R&D efforts to develop enhanced sensitivities
Implementation plan
early, well-equipped LBCF at DUSEL
ramping up fast enough to keep up as experiments come online.
support for distributed sites which are already serving the community
E&O component (training physics students, HS projects on screeners)
Gamma screening - HPGe at both 300’ and 4850’ level.
Alpha, Beta, and Rn counting - Commercial pre-screeners, new technology that is
currently being developed. Radon emanation chambers and systems.
ICP-MS enabling technology - reach sub-uBq/kg level. clean reagents and wet-lab
NAA and RNAA - radiochemistry (NAA),wet lab (RNAA), dedicated HPGe’s
Underground storage of ultra-pure materials - cryogens, water, noble liquids and
gases, copper, lead and germanium.
Underground ultra-pure material production facilities - electroformed copper, Kr
removal, crystal growth, clean machine shop, EDM machines, and laser welders.
Large Whole Body Counter - longer term, ultra-sensitive, large samples, deep
In Nov ’07 Town Meeting, the community agreed to submit a single S4 proposal
articulate an integrated program
define the necessary technologies and capabilities
specify R&D program needed to develop screening and materials purity
integration of physics experiment needs
identification of the larger user community (bio, geo, environ, security)
integrate with ILIAS (e.g. JRA-1)
participate in worldwide underground site characterization
open database
material radiopurities
assay capabilities
existing and new facilities – enable effective scheduling
simulation packages (Cosmo n, fission/a,n )
R&D activities (Identified by Town Meeting, Removed by S4 process definition)
enhanced beta screening
DUSEL R&D
measure the rate/spectrum of the ambient neutron background S5
development of low radiation photodetectors Experiments, DUSEL R&D
production of ultra-pure electroformed Cu S5
enhanced ICP-MS sensitivity,
SBIR, DUSEL R&D
39Ar removal, and Kr removal.
Experiments, DUSEL R&D
We organized ourselves via the wiki tool
Assigned names for the major tasks in the ISE
Job for each person
• Identify major questions and subsystems
• Identify the type and amount of engineering required
• Provide extensive references to projects and people who have
already done similar work (Define the expertise )
• Integrate with the other Physics groups around that task
Next Meeting May 9
Teleconferences every 2 weeks
Identified Major Worry #1:
S4 is designed to prepare for the DUSEL MREFC
But LBC must occur very early
THUS
Early Implementation at SUSEL should include some LBC functionality
We (S4) are not the group to do this
But we may be the people to do this
* Alerted SUSEL management to this need (discussions with Jose)
* Work to understand this in parallel
* Seek other funding: State? EPSCoR? DUSEL R&D ?
* Need something AT SUSEL, but also consider funding screening devices
in other sites that will be moved to DUSEL later.
Training of students
Test elements and assembly issues for Detectors going to DUSEL
Local expertise, cost effective.
Major Worry #2
Defining the overlap will be tricky: We do not want 3 Integrative
“common” proposals that duplicate work and interfere destructively.
What is the scope of the AALRMS S4 now that R&D is gone?
Is it just a loose collection of the other Physics Groups?
DM
Groups
Dbl Beta
Groups
Solar
Nu’s
AALRMS
Facilities
PLAN: Common Proposals could simply identify representatives that
work with the AALRMS project engineers…
or the OTHER WAY AROUND?
Facilities could clearly spell out their responsibilities and lend
resources to AALRMS…. Or simply take over those aspects.
Consider seriously whether there shouldn’t be
ONE INTEGRATIVE PROPOSAL
(rather than multiple “common proposals” )
This S4 then becomes a proposal which
* Connects Facilities to Experiments
Managed by the Lab itself, since it is not an EXPERIMENT
* Contains working groups within it that are organized by experiment
LBC is then defined by experiments,
but shared via identified commonalities
as well as other common infrastructure
* Explores the common infrastructure
within Physics Groups (via their working groups in THIS S4)
between Physics Groups (via another working group in this SAME S4)
* Identifies Synergies to geo/bio
* Creates Integrative tools and common databases