Author:
Higashino Satoshi,Ikeda Tomonori,Nakayama Ayaka,Ofuji Mizuno,Miuchi Kentaro
Abstract
Abstract
NEWAGE is the experiment of direction-sensitive dark matter search using low pressure
gaseous TPC with micro pattern strip readout (μ-PIC). It allows to measure the distribution
of angles of WIMP-nuclear recoil by track reconstruction, and it allows a positive signature of
dark matter. In recent years, large size (∼1 m3) TPC filled with SF6 gas, which is
so called “negative-ion gas”, is under development. A TPC with negative ions is a novel technology
for the measurement of absolute position of drift direction coordinates in a self-triggering
system. The determination of the absolute track position allows to discriminate nuclear recoils
in the target gas volume from alpha-rays from the detector surface, which is one of the background
sources. Furthermore, diffusion of drifting negative ions is expected to be lower than that of
nominal electron drift, which allows to improve angular resolution. This presentation reports the
status of the development of negative-ion gaseous TPC with a prototype small chamber. In
addition, we started to develop O(100) μm pitch gaseous TPC detector with pixel type readout
system to achieve reconstruction of short track nuclear recoils with good angular resolution. It
enables to explore lower mass region of direction-sensitive dark matter searches. We also report
about the status of the pixel detector development.
Subject
Mathematical Physics,Instrumentation