Vision Document (March 2013)
The Vision Document linked above was requested by Michael Salamon during the Cosmic Frontier Workshop at SLAC.
It presents the reasons we believe such a consortium or network is needed for rare event searches. It also sets out certain “Principles” which represent the consensus of members of the community who contributed to the discussion during the AARM, DURA, and Facilities Frontier targeted meetings. It does NOT explain how such a consortium will be run in practice, nor how much it would cost, nor how to organize the disparate groups. The purpose of this WIKI is to begin the hard work of creating the form of such an entity, eventually to be proposed from the community to DOE and NSF.
Include type, percent available, sensitivity, and the FTE technicians & cost for user screening of available resources.
PNNL (Eric Hoppe)
ICP-MS - Dedicated instrument and clean room facilities for low background assays
Variety of materials can be assayed such as polymers, electronic components, cables and wires, metals, etc. to sub-micro Bq
Gamma-ray assay - Above and below ground, single and multi-xtal array HPGe detectors with radon purge
Above ground include 6 commercially shielded HPGe detectors (n-type and p-type), ranging from 40-75%
Below ground systems under development in new shallow underground lab.
NAA - PNNL works with WSU, OSU, and others to perform NAA when needed.
Materials - Production and/or preparation and handling
Electroformed copper produced in clean room environment in an on-site shallow underground laboratory.
Surface preparation, cleaning, packaging, and handling of various materials for low-background detectors.
Variety of other instrument capabilities for assay purposes available through the EMSL
Soudan (Prisca Cushman)
Low threshold Gopher HPGe (managed by CDMS)
SOLO HPGe (managed by Brown/LUX)
Muon Shielded Room with time-stamped muon tracks
Neutron Multiplicity Meter and USD LS neutron detector
SURF (Jason Goon)
KURF (Reyco Henning)
2 low background commercial HPGe detectors with Rn purge installed (See Nucl. Instr. and Methods A 642 (2011) 65)
Technical support provided by TUNL and a part-time graduate student.
Samples currently screened at no cost to experiments, however increased demand may change this.
LBNL (incl Oroville) (Yuen-dat Chen)
Surface Site: HPGe (115% n-type with muon veto), HPGe (p-type), BF3, NAI and existing shielding/low background space for R&D hosting.
Oroville Site (600 mwe): HPGe (85% p-type) and large existing shielding for R&D hosting including data transfer and maintenance support.
UC Davis (Mani Tripathi)
NAA using TRIGA reactors at Davis (2MW) and Irvine (0.5MW). Davis reactor allows for quick exposures in the reactor core or longer exposures at the periphery of the water tank. At the Irvine reactor we are deploying a heavy water shielded sample-holder module. This will provide x10 improvement in the thermal/fast neutron flux ratio.
IC-PMS This facility is owned by another group on campus. We are able to use it on a recharge basis.
Radon Screening A facility is being developed for use by the LZ collaboration. Not clear at this point whether there will be time available for other users.
NAA (Alabama) (Andreas Piepke)
SNOLAB (Ian Lawson)
1 PGT coax germanium detector for gamma assaying, sensitivity to energies between 90 and 3000 keV, sensitivity down to 1 mBq for U and Th.
PGT detector usage, currently about 380 samples (note that the total may not equal 100% due to rounding), as follows:
Canadian Based Experiments:
SNO/SNO+ 27.8 %
DEAP 22.4 %
HALO 1.9 %
PICASSO 2.4 %
US Based Experiments:
SNOLAB 11.9 % (Samples which are not for any specific experiment)
Canberra well germanium detector for gamma assaying, sensitivity to energies between 10 to 600 keV, sensitivity down to 0.2 mBq for U and 0.4 mBq for Th 0.1 mBq for 210Pb.
Electrostatic Counters, 11 counters in operation, these are essentially alpha counters, which count the alphas from thorium and uranium decay chains. Sensitivity down to 10^-16 gU/g in the 226Ra chain.
Alpha-Beta counters, 8 counters available, these search for alpha-beta coincidences in the U and Th chains, sensitivity down to about 1 mBq.
The alpha-beta counters have been used mostly by SNO and now SNO+, but are available for other experiments.
Canberra coax germanium detector, this is currently being refurbished by Canberra France and should be returned to SNOLAB this Fall.
Summary: In general, the SNOLAB facilities are used by SNOLAB based experiments. Although the facilities are available for non-SNOLAB experiments, only DM-ICE has used the facilities. This is mostly due to the continuous queue of about 10 samples for the PGT detector from the SNOLAB experiments. Once the Canberra coax detector arrives and is setup, then additional samples can be counted and current samples can be counted longer as needed.
Gran Sasso (Matthias Laubenstein)
Kamioka (2700 mwe)
1 HPGe detectors under construction by the KamLAND collaboration. This detector is expected to be for exclusive use of KamLAND, but they may consider use by other experiments on a case-by-case basis.
1 HPGe detectors under construction by the CANDLES collaboration, not available to other users.
3 Germanium detectors, 2 p-type and 1 n-type, operated by XMASS and SuperK, available for others with preference to XMASS and SuperK
ICP-MS operated by XMASS and SuperK, available for others with preference to XMASS and SuperK
API-MS operated by XMASS and SuperK, available for others with preference to XMASS and SuperK
Many Rn detectors to measure emanation of Rn from materials, operated by XMASS and SuperK, available for others with preference to XMASS and SuperK
Japan (Surface)
1 HPGe detector operated by KamLAND, not available for other users.
1 HPGe detector operated by CANDLES in Osaka, not available for other users. Sensitivity is a few mBq/kg for CaF2, relative efficiency is 35%.
Jinping (Xiang Liu, Zing Zhi)
1 HPGe detector operated by PandaX, not available for other users.
1 HPGe detector operated by CDEX, not available for other users.
N type HPGe made by Canberra, relative efficiency :40%
Detector Sensitivity: 40~2700kev, integral bkg counts rate is about 0.6 cpm; MDA is about mBq/kg for common gamma peak (eg.609keV) from environment nuclides.
2 HPGe detectors to be installed by end of 2013.
LSM, Modane (Pia Loaiza)
12 HPGe detectors, details in attached file
(pdf). The detectors are 100% dedicated to use by SuperNEMO, EDELWEISS and other experiments situated in Modane. However, Mafalda and Hellaz may be able to do work at the level of 5-10% time for other in the future.
Laboratario Subterraneo de Canfranc (Iulian Bandac, Alessandro Bettini and Yolanda Labarta)
5 HPGe detectors installed and operational.
2 HPGe detectors to be installed by summer 2013.
Details of the detectors in attached file
(pdf). The detectors are currently in 100% usage by LSC experiments. However, they are interested in working with experiments outside of LSC.
All detectors are ~2kg, p-type close-end coaxial produced by Canberra. Each detector has a shield consisting of 5 cm or 10cm copper and 20 cm of very low activity lead. Nitrogen gas is flushed inside a methacrylate box to avoid airborne radion. The radon level inside the lab is ~ 80 Bq/m^3.