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Dark Matter search with EDELWEISS and beyond. Gilles Gerbier CEA Saclay – IRFU Rencontres de M oriond - VHEPU march 15 th 2013. European Underground Rare Event Calorimeter Array. Expérience pour DEtecter Les Wimps E n SIte Souterrain. The EDELWEISS collaboration. 4800 mwe.

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dark matter search with edelweiss and beyond

Dark Matter search with EDELWEISS and beyond

Gilles Gerbier

CEA Saclay – IRFU

Rencontres de Moriond- VHEPU march 15th 2013

European Underground Rare Event Calorimeter Array

ExpériencepourDEtecterLesWimpsEn SIteSouterrain

the edelweiss collaboration
The EDELWEISS collaboration

4800 mwe

Karlsruhe

J Gascon/IPNL : spokesman

  • CEA Saclay (IRFU and IRAMIS)
  • CSNSM Orsay (CNRS/IN2P3 + Univ. Paris Sud)
  • IPN Lyon(CNRS/IN2P3 + Univ. Lyon 1)
  • Institut Néel Grenoble (CNRS/INP)
  • LPN Marcoussis (CNRS)
  • Karlsruhe Institute of Technology
  • JINR Dubna
  • OxfordUniversity
  • SheffieldUniversity

Laboratoire Souterrain de Modane - LSM

(Fréjus tunnel)

LSM

the edelweiss ii infrastructure

Polyethylene shield

Pb shield

cryostat

Muon Veto

Neutron counter

The EDELWEISS-II infrastructure
  • Innovative dilution cryogenicset-up (18 mK) :
    • Can host up to 40kg of detectors
  • Shieldings :
    • Clean room + deradonizedair 10 mBq/m3
    • Active muon veto (>98% coverage)
    • 50-cm PE shield + 20-cm lead shield

3He detector

  • Otherside monitoring detectors:
    • Radon detector down to few mBq/m3
    • He3 neutron detector (thermal neutron monitoring insideshields) sensitivity ~10-9 n/cm2/s
    • Liquidscintillator neutron counter (study of muon induced neutrons)
the edelweiss ii infrastructure1

Polyethylene shield

Pb shield

cryostat

Muon Veto

Neutron counter

The EDELWEISS-II infrastructure
  • Cryogenicinstallation (18 mK) :
    • Can host up to 40kg of detectors
  • Shieldings :
    • Clean room + deradonizedair 10 mBq/m3
    • Active muon veto (>98% coverage)
    • 50-cm PE shield + 20-cm lead shield

3He detector

  • Otherside monitoring detecetors:
    • Radon detector down to few mBq/m3
    • He3 neutron detector (thermal neutron monitoring insideshields) sensitivity ~10-9 n/cm2/s
    • Liquidscintillator neutron counter (study of muon induced neutrons)
detector principles 3 parameters to isolate signal
Detector principles : 3 parameters to isolate signal

Old : GeNTD

  • Germanium bolometers @ 17 mK
  • Ionizationmeasurement @ few V/cm
  • Heatmeasurement (NTD sensor)
  • Discriminating variable between ER and NR

« Q » = ionization/recoilenergy

All

planar

electrode

Recent: ID400

Fiducial annular electrodes

VETO B

A: +4 V

B: -1.5V

electronrecoils (ER)

Guard

planar

electrode

Fiducial

volume

nuclearrecoils (NR)

C: -4 V

D: +1.5V

Neutron calibration

(S. ScorzaPhDthesis)

VETO D

  • = Ionization« VETO » = > « Surface/beta » identification : if non zero, rejectevent
  • NB : idea first presented by CDMS group at LTD
detector principles 3 parameters to isolate signal1

6x104

210Bi

6x104

210Po

6x104

210Pb

1 evt

Detector principles : 3 parameters to isolate signal

Old : GeNT

  • Germanium bolometers @ 17 mK
  • Ionizationmeasurement @ few V/cm
  • Heatmeasurement (NTD sensor)
  • Discriminating variable=

« Q » = ionization/recoilenergy

All

planar

electrode

New : ID400

Fiducial annular electrodes

A: +4 V

B: -1.5V

electronrecoils (ER)

Guard

planar

electrode

Fiducial

volume

nuclearrecoils (NR)

C: -4 V

D: +1.5V

Neutron calibration

(S. ScorzaPhDthesis)

  • Surface identification = Ionization VETO

If non zero, rejectevent

edelweiss ii limits 2011 and edelweiss cdms combined analysis
EDELWEISS II limits (2011) and EDELWEISS -CDMS combinedanalysis

made with dmtools

  • 10 ID detectors of 400 g operated during ~ 1 y
  • CDMS has same target and same sensitivity
  • Simple merger of data sets chosen prior to any analysis.
    • EDW II: 384 kg.d, [20-200keV], 5 evts
    • CDMS: ~379 kg.d, [~10-100keV], 4 evts
  • => ~50% gain at high WIMP masses.
  • NB : CDMS decides on an ID-inspired design for the electrodes of its future detectors.

Phys. Rev. D 84, 011102 (2011).

“WIMP safe” mass concept !

Check PDG “Dark Matter review” by Drees&Gerbier

recent edelweiss low mass analysis
Recent EDELWEISS low mass analysis
  • Realization that, despite being tuned for MWIMP~100 GeV, EDELWEISS-II had significant efficiency down to 5 keV recoil
  • Significant background rejection with ID electrodes down to low energywth subset of data => significant improvement down to 7 GeV WIMP mass
  • Resolutions are improving with new electronics (FWHM 900 eV -> 650 eV for ionization, 1.25 -> <1 keV for heat)
  • 500 eV achieved in tests (HEMT R&D to go down to 300 eV?)

10 GeV WIMP – ID3

EDW II LE

PRD 86 (2012) 051701R

EDELWEISS-III report to CSIN2P3

slide9

Searching for axions

  • Detection/production by Primakov effect gag
  • Solar axions
  • g->g+a ------------------>a+g->g f(E, t, a) Bragg diff

Preliminary

Single detector

Edelweiss II

Expected pattern f(E,t) for given orientation

angle of crystal vs sun direction

NB : electronrecoils

Otherconstraints on gae macurrentlystudied

PhDWork of T de Boissiere

edelweiss iii few 10 9 pb sensitivity @ 60 gev
EDELWEISS-III : few 10-9pbsensitivity @ 60 Gev
  • Detectors
    • 40 FID800 detectors 24 kg fiducial, installed2013 (factor 15 wrtbefore)
    • 2 NTD sensors/detector
    • CurrentEDW-II setup : major upgrade
    • new cabling, cold electronics
    • new cryogenics (lowermphonic noise)
    • new internal PE shielding
    • replacement of thermal shieldswithloweractivity Cu
  • => Expectlowerthresholds, lowerbackground (g and n), and redondancy
  • Program (1.6 M€) funded: upgrade finishedat 95 %, cool down on going (march 2013) with 15 detectors
  • Results by 2014
slide11

EDELWEISS III : new detectors FID800

Fiducial

mass

~640g

All annular electrodes

  • Fid mass *4 wrt to ID400
  • No NR eventin g calibration
  • Expectedto be and indeedbetterthanIDs !

FID800(410 000 )

ID400 (350 000 )

11

slide12

EDELWEISS-III : improved5-15 GeVsensitivity

  • Coverage of low-mass region with 4 FID detectors with 300 eV FWHM resolutions (1200 kgd), 3 keVEr threshold thanks to new HEMT replacing JFET
  • HEMT R&D ongoing

1 evt,

10 keVthresh

12 000 kg.j

eureca status 2013
EURECA Status2013
  • EDELWEISS+CRESST +others (19)
  • CDR written
  • Baseline : 2 phases: 150 kg then1 t
  • Choice of balance Ge / CaWO4 to beoptmised vs physicsreachat time t
  • Basic features
    • Favored site : LSM : deepest in Europe
    • Large water active shield
    • 7 mK base temp , « scalablecryogenics » see P Camus
    • Flexible design for different detectors
    • Tower design : fullyintegrated, 7mk-300k see H Kraus
  • No common official proposalsubmittedyet
  • Strongwill to makecommonprojectwith S-CDMS
lsm underground lab extension

Last status jan 2013

  • Excavation of the extension 2014 or 2015.
  • In operation in 2016/2017.
  • Detailedstudiesfunded by Savoie departement and Rhone-AlpesRegion
  • Agreement fromMinistery and CNRS for the project
  • Funding in progress (85% alreadyobtained CNRS, RegionRhone-Alpes, FEDER funds)
  • Technical discussion in progress
LSM underground lab extension

New

50 m

New

Actual

Italy

France