1202.0721 (NEXT Collaboration)
NEXT Collaboration
In this Technical Design Report (TDR) we describe the NEXT-100 detector that
will search for neutrinoless double beta decay in Xe-136. The document
formalizes the ANGEL design presented in our Conceptual Design Report (CDR).
The baseline detector is designed to hold a maximum of about 150 kg of xenon at
15 bar, or 100 kg at 10 bar. This option builds in the capability to increase
the total isotope mass by 50% while keeping the operating pressure at a
manageable level.
The ANGEL design calls for an asymmetric TPC, with photomultipliers behind a
transparent cathode and position-sensitive light pixels behind the anode. We
have chosen the low background R11410-10 PMTs for energy and timing and
Hamamatsu MPPCs (S10362-11-050P model) as tracking pixels. Each individual PMT
will be isolated from the gas by an individual, pressure resistant enclosure
and will be coupled to the sensitive volume through a sapphire window coated
with terphenyl-butadiene (TPB) . MPPCs will be arranged in Dice Boards (DB)
holding 64 sensors each in an array of 8x8 sensors. The light tube will also be
coated with TPB.
View original:
http://arxiv.org/abs/1202.0721
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