3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

Refurbishment of KamLAND outer detector

Aug 8, 2016, 6:30 PM
2h
Riverwalk A/B

Riverwalk A/B

Poster Detector: R&D and Performance Poster Session

Speaker

Mr Hideyoshi Ozaki (Tohoku university)

Description

The Kamioka Liquid-scintillator Anti-Neutrino Detector (KamLAND) at Kamioka-mine in Japan, witch has been taking data since Jan 2002, has detected reactor neutrinos and geo-neutrinos using 1,000ton ultra-pure liquid scintillator. The Outer Detector (OD) is a 3,200ton water Cherenkov detector with 225 20-inch photomultiplier tubes (PMTs). The OD is a cosmic ray-muon veto counter and suppresses muon-induced neutrons to enter the liquid scintillator inner detector (ID). The muon tagging efficiency of the OD had gradually decreased since 2010, which was caused by gradual failure of 20-inch PMTs. To prevent increasing neutron backgrounds, we launched on OD refurbishment in Jan 2016. The 225 20-inch PMTs that were reuse of the Kamiokande-PMTs were replaced with 140 new 20-inch PMTs. At the relatively low sensitive region, the photo-coverage was enhanced and high reflective tyvek sheets were added. We present a report of OD refurbishment work and the latest data of the new OD.

Primary author

Mr Hideyoshi Ozaki (Tohoku university)

Co-author

Prof. junpei Shirai (RCNS, Tohoku University)

Presentation materials