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Llu í s Mart í Magro (Univ. Tokyo, ICRR) for the S uper- K amiokande collaboration.

Super-Kamiokande Gadolinium R&D Project: Status and Outlook 68 th JPS annual meeting. Kyoto. September 11 th , 2012. Llu í s Mart í Magro (Univ. Tokyo, ICRR) for the S uper- K amiokande collaboration. Supernova Relic Neutrino. Flux limit at Super-K. Phys. Rev. D 85, 052007 (2012).

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Llu í s Mart í Magro (Univ. Tokyo, ICRR) for the S uper- K amiokande collaboration.

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  1. Super-Kamiokande Gadolinium R&D Project: Status and Outlook68th JPS annual meeting. Kyoto. September 11th, 2012. Lluís Martí Magro (Univ. Tokyo, ICRR) for the Super-Kamiokande collaboration.

  2. Supernova Relic Neutrino Flux limit at Super-K Phys. Rev. D 85, 052007 (2012) → Measurement limits getting closer to predictions → Large backgrounds dominate this analysis → Expand the energy range starting from 10 MeV The goal is the discovery of SRN ! 2 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  3. GADZOOKS! GadoliniumAntineutrinoDetectorZealouslyOutperformingOldKamiokande Super! Inverse beta decay (2.2MeV) J.Beacom and M.Vagins, Phys.Rev.Lett.93 (2004) 17110 →Dissolve Gd in SK pure water (0.2%) →Neutrons captured on Gd produce a cascade of photons of ~8 MeV →The coincidence detection of e+ and those photons we can single out inverse beta decays and greatly reduce backgrounds!! ~8 MeV • ΔT~30μsec • Vertices within ~50cm 3 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  4. EGADS Evaluating Gadolinium’s Action onDetectorSystems • Our Goals: • Water purification system • Monitor the water transparency • Effects on detector components • Adding/removing Gd • Neutron background Achieve and maintain a high water quality while keeping Gd 200 ton tank (d=6.5 m, h=6.5 m) Water transparency measurement 200 ton tank 240 20' PMT 15 ton tank Water system New hall Kamioka mine 4 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  5. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 5 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  6. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 6 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  7. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 7 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  8. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 8 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  9. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 9 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  10. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 10 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  11. EGADS plan schedule - Step 1:Circulation through the 200 ton tank with pure water (no PMTs mounted) Done! - Step 2:Circulation through the 15 ton tank with Gd2(SO4)3Done! - Step 3:Circulation though the 200 ton tank with Gd2(SO4)3 loaded water - Step 4: PMT mounting (240 in total) - Step 5:Full realization of the EGADS project 11 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  12. Filtration of Gd loaded water Porous size ++ ―> (UF) (NF) (RO) Impurities size ++ ―> 12 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  13. Water system To Drain 5 m UF#1 Reject Line Ultrafilter #1 UF #1 Chiller Anion-removal resin Anion-removal resin 15 ton EGADS Test Tank UV #1 0.2 m 2nd Stage Filter Repressurization Pump (>0.6 MPa, >4 ton/hr) 5 m 1st Stage Filter Intake Pump (>4 ton/hr) Membrane Degas NF #1 0.5 ton Collection Buffer Tank UF#2 Reject Concentrated Gd NF Reject Lines UF #2 Conveying Pump (~0.35 MPa, >4 ton/hr) Recycles RO Reject Lines UV #2 0.5 ton Buffer Tank Repressurization Pump (>0.6 MPa, >3 ton/hr) RO Permeate Lines NF #2 TOC Repressur-ization Pump (>0.9 MPa, >2 ton/hr) DI #2 Repressurization Pump (>0.9 MPa, >1.5 ton/hr) DI #1 RO #2 5 m Filter 5 m Filter RO #1 M.Vagins 13 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  14. The EGADS Hall 15m3 tank for pre-treatment 200 ton tank UDEAL Anion-removal resin (AJ4400) Water system Pre-treatment system 14 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  15. The EGADS Hall New AJ4400 July 11th Gadolinium removal system Water system Flushing system 13th August 15 m3 tank and pre-treatment 15 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  16. Gadolinium sulfate concentration New run (20th July) Pump 4 off (2nd May) Pump 4 off (2nd May) NF1-R reduced from 12L → 9L (19th April) NF1-R reduced from 12L → 9L (19th April) Sampling date We can keep the Gd concentration constant ! 16 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  17. Summary • Step 1: the EGADS main water system is able to reach and maintain SK pure water quality level • Step 2: after adding Gd, the water system can obtain and maintain a high pure water quality level (see Yano-san's talk) while keeping Gd → New AJ4400 resin installed in the main water system → Membrane flushing system upgraded • Step 3: soon we will start the circulation of Gd loaded water though the 200 ton tank • Preparations for the next steps are well advanced: PMT pre-calibration and installation, DAQ system, etc (see Mori-san and Yamaguchi-san's talks!) Done! Done! Hollow cathode lamp 17 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  18. Hollow cathode lamp BACKUP

  19. Transparency (pure water, step1) The EGADS main water system reached SK level pure water 19 Lluís Martí Magro 68th JPS annual meeting 11th September, 2012

  20. Hollow cathode lamp BACKUP

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