1 / 26

Summary of the workshop on Future Low-Energy Neutrino Experiments

Summary of the workshop on Future Low-Energy Neutrino Experiments TUM, Munich, October 9-11, 2003. Thierry Lasserre CEA/Saclay, CERN, 20/11/2003.  e.  e,,. One nuclear plant & two detectors. D 1 = 0.1-1 km. D 2 = 1-3 km. Nuclear reactor 1,2 core(s)  ON/OFF : ok

nili
Télécharger la présentation

Summary of the workshop on Future Low-Energy Neutrino Experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Summary of the workshop on Future Low-Energy Neutrino Experiments TUM, Munich, October 9-11, 2003 Thierry Lasserre CEA/Saclay, CERN, 20/11/2003

  2. e e,, One nuclear plant & two detectors D1 = 0.1-1 km D2 = 1-3 km Nuclear reactor 1,2 core(s)  ON/OFF : ok  4 cores  ON/OFF : no ! Near detector 5-50 tons > 50 mwe Far detector 5-50 tons > 300 mwe • Isotrope e flux (uranium & plutonium fission fragments) • Detection tag : e + p  e+ + n, <E>~ 4 MeV, Threshold ~1.8 MeV • Disappearance experiment: suppression+shape distortion between the 2 detectors • 2 IDENTICAL detectors (CHOOZ, KamLAND, BOREXINO/CTF type) • Minimise the uncertainties on reactor flux & spectrum (2 % in CHOOZ) • Cancel cross section uncertainties • Challenge: relative normalisation between the two detectors < 1% !

  3. Groups involved in discussions • US : • Columbia University • Argonne National Laboratory • Berkeley Laboratory • The University of Chicago • The University of Alabama • Caltech • Stanford University • etc … • France : • PCC, Collège de France & APC • (Chooz, LENS, Borexino) • CEA/Saclay • (LENS) • Germany : • MPI fuer Kernphysik, Heidelberg • (Borexino, LENS  Gd scintillator) • TUM, Munich • (Borexino) • Tubingen University • (Borexino) • Italy : • INFN Bologna • Japan : • Tokyo Metropolitan University • Tohoku University • Russia : • Kurchatov Institute sorry for the groups I have omitted …

  4. X 2 Double CHOOZ 10-15 t ! Detector size scale Reactor/13 Example ~20 t ( 5  50 t) CHOOZ 5 t Borexino 300 t KamLAND 1000 t

  5. 90% C.L. sensitivity if sin2(213)=0 @m2=2.0 10-3 eV2 σbkg σbkg σbkg JHF 1% Huber, Lindner, Schwetz & Winter: hep-ph/0303232 G. Men tion & T. L. 0.1% reactor 1 (2 RNU) reactor 2 (40 RNU) RNU = Reactor Neutrino Unit : 1 RNU = 1031 free H GWth year • Reactor1 (0.5 km, 2.3 km): ~13 tonsPXE x 10 GW x 3 years  sin2(213)<~0.02, 90% C.L • Reactor2 (0.5 km, 2.3 km): ~270 tonsPXE x 10 GW x 3 years  sin2(213)<~0.01, 90% C.L

  6. Forthcoming  LBL & sin2(213) CHOOZ-I 90% C.L Huber, Lindner, Schwetz & Winter (Theory group, TUM)

  7. Next generation  LBL & sin2(213) CHOOZ-I 90% C.L Huber, Lindner, Schwetz & Winter, (Theory Group, TUM)

  8. Which site for the experiment ? Penly Chooz Cruas Byron Kashiwasaki Krasnoyarsk Diablo Canyon Taiwan Angra One reactor complex Two underground cavities @0.1-1 km & ~1-2 km

  9. Which site for the experiment … CHOOZ Kashiwasaki Diablo Canyon

  10. The Diablo Canyon site (US) 600-800 mwe • Close to San Francisco (500 km), California. Leader Group: LBNL • Two cores (2 x 3.1 GWth) • 3 detectors : D1~300m , D2 ~ 0.8 – 1 km , D3 ~ 2 – 3 km • Horizontal tunnel >1.5 km with 300  800 mwe overburden • Status: negotiation with the power plant underway (permit, safety , ecology …) Partial approval from PG&E to proceed with geological studies • Tunnel + labs + 2 movable detectors (50-100 tons) to be constructed simultaneously • Data taking  end 2007 ? Cost ~ 50 M$ • sin2(213)<0.01-0.02 @90% C.L

  11. The Kashiwasaki site (Japan) Kashiwasaki power plant: 24.3 GWth 7 cores  2 near detectors needed ! Leading group: Tohoku Univ. (Suekane_san & Inoue_san)

  12. Scheme of one shaft The Kashiwasaki site (Japan) • Kashiwasaki power plant : 24.3 GWth • 7 cores  2 near detectors needed ! • D1~300-400 m , D2 = 1.3 km • 3 identical detector of ~8 tons  3 shafts (12 M$, 15 months) • Near detectors @100 mwe • Far detectors @500 mwe • Data taking ~2007-2008 – Cost <20 M$ Sensitivity (3 years): sin2(213)<0.026 @90% C.L

  13. The Chooz site, Ardennes, France … Double-CH1313Z …

  14. The Chooz site Near site: D~100-200 m, overburden 50-80 mwe Far site: D~1.1 km, overburden 300 mwe [former experimental hall] 2x11.5 tons, D1=100-200m, D2=1050m. Sensitivity: 3 years  sin2(213) < ~0.03

  15. CHOOZ-Far… ready to be used again!

  16. CHOOZ-Far detector (12.7m3 fiducial, preliminary) 3.5 m CHOOZ-I pit 7 m

  17. CHOOZ-Near 250 m 125 m A few locations under study, but enough space in any case

  18. CHOOZ-Near new Laboratory ~10-15 m Dense material ~5- 15 m Other possibility: bloc of concrete (d~2.4) piled up !

  19. Status of the discussions with EDF • CHOOZ site has been secured. -Strong support for the CHOOZ nuclear plant • Far site: 1.1 km & 300 mwe -Existing laboratory -Available (7x7 m tank of CHOOZ-I) • Near site: 100-200 m -Underground detector + man-made overburden -Feasibility confirmed by the power plant staff -50 to 80 mwe required -Civil engineering study will start soon (done & financed by EDF )

  20. The experimental challenge Relative error between Near/Far detector < 0.8% seems possible [still under study]

  21. Sensitivity to sin2(213) sin2(213) @90% C.L σbkg: [near] = 1% [far] = 0.5% σbkg: [near] = 1% [far] = 1% σbkg: [near] = 2% [far] = 1% @m2atm=2.0 10-3 eV2 years 1 0.75 2 1.5 3 2.25 4 (pure PXE) 3.0 (PXE/PC + mineral oil) 1 #DNear 0.1 km #NumberOfFreeProtonsNear 1.8944e+29 (11.5 tons PXE) #DFar 1.05 km #NumberOfFreeProtonsFar 3.7888e+29 (11.5 tons PXE) #Global normalisation Fit is [ON ] with an error of 2% #Relative normalisation Fit of Near/Far Detector is [ON ] with an error of 0.06% #Shape Error Fit is [ON ] with an error of 2%

  22. Summary & outlook @Double-CHOOZ • Support for the EDF power company to do a 2nd experiment @CHOOZ Reactor potential @CHOOZ: sin2(213)<~0.03, 90% C.L. (m2 = 2.0 10-3 eV2) Current limint: CHOOZ : sin2(213)<0.2 discovery potential ! • Technology / design well known (Chooz-I, Borexino, KamLAND, …)  few R&D needed : Gd loading (stability) + material compatibility  R&D in Saclay : material compatibility + mechanical constraint + scint. test • Case under study: French  target vessels & German scintillator (MPIK) • Experiment cost, Double-CHOOZ case: 2 x ~15 tons, cost detectors <~10 Meuros. (+ Civil engineering) • Our Goal @CHOOZ: Construction starts in 2005 (+ civil engineering ) Start data taking in 2007-2008 year 2004 2005 2006 2007 2008 2009 2003 Site Prop. design Construction ? Construction ? Data taking < sin2(213) < 0.025-003 < sin2(213) < ~0.04

More Related