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2/25/2008 ILIAS 1 Network on Direct Dark Matter Search – ILIAS – N3 N3 – Dark Matter
2/25/2008 ILIAS 1
Network on Direct Dark Matter Search – ILIAS – N3
N3 – Dark Matter
2/25/2008 ILIAS 2
ILIAS-N3 Dark Matter Network– Participating Institutions –
ILIAS-N3 Dark Matter Network– Participating Institutions –
EDELWEISSlow background
cryogenic detectors
ZEPLIN, DRIFTlow backgroundliquid Xenon, gas
CRESSTlow background
cryogenicdetectors
CAST AXION Search
High Purity MaterialsLow Background and Shielding
Ge DetectorsDark Matter
Italy: INFNDipartimento di Fisica G. Occhialini
dell'Universit diMilano-BicoccaLaboratori Nazionale del Gran Sasso
Switzerland:University Bern . Laboratory of High Energy Physics
Greece: Uni ThessalonikiThessaloniki UniversityUniversity of Patras
Tuerkey: Uni IstanbulBogazici University, Istanbul
Serbia:University of Novi Sad
France: CNRS/CEACNRS/SPM/CRTBT GrenobleCNRS/IN2P3/IPN LyonCNRS/IN2P3/CSNSM OrsayICNRS/IAS OrsayCNRS/INSU/IAP ParisCEA/DSM/DAPNIA SaclayCEA/DSM/DRECAM SaclayModane Underground Laboratory
Germany: TU Munich, Uni TübingenMax-Planck-Inst. Nucl. Phys., HeidelbergTechnical University Munich Eberhard Karls University TuebingenMax-Planck-Institute for Physics, MunichInstitut Physik.Hochtechnologie IPHT, JenaForschungszentrum Karlsruhe Institut für Kernphysik University Karlsruhe –Institut für exp. KernphysikMax-Planck-Institute for Extraterrestrial Physics, GarchingTechnical University DarmstadtFrankfurt University
United Kingdom: Uni SheffieldLondon Imperial CollegeOxford University - Department of PhysicsRutherford-Appleton Laboratory - High Energy PhysicsSheffield University- High Energy Physics, SheffieldBoulby Underground Laboratory, Boulby
Spain : Uni ZaragozaUniversity of Zaragoza - Laboratory of
Nuclear and High Energy Physics
2/25/2008 ILIAS 3
Network Structure
WG1-CDC: J.C.Lanfranchi TUM Munich
WG2-LX : N.Spooner Sheffield/
A.Rubbia - ETH Zürich (ArDM) and L.Baudis –Zürich (XENON)
WG3-GeNaI: M.Sarsa Zaragoza
WG4-AD: E.Daw Sheffield
WG5-BSNS: V.Kudryavtsev Sheffield
WG6-HPMP: R.Lemrani CEA
WG7-AXION: K.Zioutas Patras
WG8-COMM: J.Jochum and G.Chardin Tübingen / CEA
2/25/2008 ILIAS 4
Dark Matter and Dark Energy
• Ordinary (baryonic) matter onlyrepresents only ≈ 4% of theUniverse energy content
Outstanding question : What is the Universe made of ?
2/25/2008 ILIAS 5
DarkMatter
search for physics beyondthe Standard Model
new elementary particles
Supersymmetry ???AXION ???
2/25/2008 ILIAS 6
Natural WIMP : SUSY Lightest particle
Stable if SUSY exists and R-parity is conserved• Direct detection:
– WIMP scattering off nuclei
˜ χ 10 = N11
˜ B + N12˜ W 3 + N13
˜ H 10 + N14
˜ H 20
Zg = N112
+ N122gaugino fraction:
PMTsPMTs
PEEK SupportsPEEK Supports
CathodeCathode
GridsGrids
Waveshifter/ReflectorWaveshifter/Reflector
2/25/2008 ILIAS 7
Dark Matter Search – in ILIAS
directional
2/25/2008 ILIAS 8
Nuclear recoil discrimination down to 20
keV threshold : γ-ray rejection > 99.99 %
Charge + Heat Measurement
Neutron + gamma calibration
Edelweiss: event-by-event discrimination
2/25/2008 ILIAS 9
EDELWEISS
• promising results with active rejection of surface eventsNbSi thin films or interdigitized electrodes
2/25/2008 ILIAS 10
90% of nuclear recoils with quenching factor 7.4 below this line
90% of nuclear recoils with quenching factor 40 (tungsten) below this line
10.72 kg days
CRESST background rejectionby light vs. phonons
2004: no neutron shield
2/25/2008 ILIAS 11
PE- shielding and muon veto
50 cm PE – shielding (12 tons)Plastic scintillator muon veto
2/25/2008 ILIAS 12
2007 datatwo 300gr detector modules
CRESST – with neutron shield
2/25/2008 ILIAS 13
Liquid Noble Gases (Xenon / Argon)background rejection by light vs. charge
2/25/2008 ILIAS 14
Nuclear recoil AmBe calibration
Charge + Light Measurement
Gamma calibration
XENON neutron and gamma calibrations
J. Angle et al., astro-ph:0706.0039
QuickTime™ et undécompresseur TIFF (non compressé)sont requis pour visionner cette image.
QuickTime™ et undécompresseur TIFF (non compressé)sont requis pour visionner cette image.
2/25/2008 ILIAS 15
“Dirty” argon WARP 2.3 lt at LNGS
Impressive > 107 background rejection factorProcurement of 39Ar depleted argon in future
2/25/2008 ILIAS 16
ZEPLIN II – WIMP Search Data
2/25/2008 ILIAS 17
XENON10 WIMP Search Data
2/25/2008 ILIAS 18
Experimental status and strategy
• Goal ≈ 20xx10-10 pbarn
• Factor ≈ 300 progress in sensitivity still requiredcompared to best presentsensitivities
• cooperation towards large scale experimentscryogenic=> EURECAliquid gases => XENON,
ZEPLIN, WARP
• 10-8 soon !
• Most experiments (below, XENON) are recording background events, andtesting strategies to remove them
XENON-10
CDMS
CRESST
2/25/2008 ILIAS 19
ILIAS-N3 Dark Matter Network– Structure – Working-Groups –
ILIAS-N3 Dark Matter Network– Structure – Working-Groups –
1th 2th 3th 4th Year
Convergence
on the optimum
strategy for
large
scale detector
based on eachof
the alternatives
Convergenceon the
strategyfor futurelarge scaleEuropean
Dark Matter experiments
Det
ectio
nC
once
pts Cryogenic Detectors and Cryostat
Non cryogenic Detectors and liquid Xenon
Germanium and NaI Detectors
Advanced Detectors including directional Concepts
Background Simulation, Neutron-Shield and Muon-Vetos
High Radiopurity Materials and Materials Purification
Axion Searches
Common Activities
Com
mon
Act
iviti
es
last year
Convergence
=>
cooperation between
working groups
many combinedmeetings and
activities
2/25/2008 ILIAS 20
WG 1-4 (Detector Technologies)
to do Year 4
• identify combined needs (e.g. purity, shielding.) with other working groups• strategy on integration of the cryogenic system /liquid xenon into external shield• integration of detector, read out and cooling techniques• assessment on comparison with other techniques
Meetings:
June – Grenoble: BSNS, CDC, LX, HPMPJune - CERN: COMMON Strategy, all European DM groups (except WARP)July – Sheffield: ADSeptember – Zaragoza:; BSNS, ADOctober – Garching: CDC BSNSNovember – Tübingen: CDCNovember – Sheffield, LXDecember – Modane: CDC, BSNS
2/25/2008 ILIAS 21
WG 1-4 (Detector Technologies)
Integration of Read Out Electronic
2/25/2008 ILIAS 22
WG 1-4 (Detector Technologies)
Integration Cryogenics into Sheilding
2/25/2008 ILIAS 23
WG 1-4 (Detector Technologies)
Large Cryostat Concepts
2/25/2008 ILIAS 24
WG 1-4 (Detector Technologies)
Vibration Insulationof Cryogenic Systems
2/25/2008 ILIAS 25
Collaborations
Design Study Proposals for 1 ton scale projects
EURECA , ELIXIR
in Design Study: Integration of EURECA into ULYSSES
December Meeting at Modane
2/25/2008 ILIAS 26
estimates on neutronyields from radioactivity
in rockin the Cu / Pbin the PE shields
e.g.
some 10 neutrons / yearin 12 tons of CRESST PE shield
~ 4000 neutrons / year per ppb Uin 10 t Pb shield
WG 5 – BSNS : many groups involved in simulations on shielding strategy, purity requirements
2/25/2008 ILIAS 27
WG 6 - HPMP
in cooperation with JRA 1
• collection of existing data on material purity• organization knowledge base• identify purity demands of different detector concepts• include results on purity into Monte Carlo Codes of different detector concepts
=> New database on material purification techniques=> With keyword search, display of details and links => Can be filled by external users through a form
2/25/2008 ILIAS 28
Different groups work on purification of liquids and surfaces :We propose a database gathering this information :
http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/tecpur/
2/25/2008 ILIAS 29
WG 7 - AXION
> 50 participants
reports on AXION experiments(PVLAS, shining through the wall)
reports on WIMP experiments
exchange WIMP – AXION community
theory: huge discovery potential for fundamental physics
2/25/2008 ILIAS 30
WG 8 - COMMON- co-ordinating cooperation between working groups
- thesis funded by N3: Vito Tomasello, thesis at Sheffield1st year at Sheffield2nd year at Tübingensimulation of neutron induced recoil events
- participation to the Dark Matter roadmap in the US, DUSEL process, publication of the DMSAG report
-definition of the ASPERA Eranet European roadmap for Dark Matter Phase II=> ILIAS N3 is leading effort for the
DM part of the ASPERA/APPEC roadmap
- Training Session on WIMP data analysis
- Data Tool Webpage by Rachid Lemrani
2/25/2008 ILIAS 31
WG 8 - COMMON
30 participants
maximum likelihood and methods that approximate it (chisquare, projection correlation analysis, etc.)
model-less methods (neutral nets and boosted decision trees).
calibration/correction for position dependence/reconstruction
calculation of confidence intervals.
Training Session - ‘ From Data to WIMP Limits’January 11 – 14 , Aussois
thanks to Richard SchneeSyracuse UniversityCDMS collaboration
talks by: EDELWEIS, ZEPLIN, CRESST, DMTools
2/25/2008 ILIAS 32
2/25/2008 ILIAS 33
2/25/2008 ILIAS 34
