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Charge amplification concepts for direction-sensitive dark matter detectors
Charge amplification concepts for
direction-sensitive dark matter detectors
D. Dujmic c,d,? P. Fisher c,d,e G. Sciolla c S. Ahlen a V. Dutta c
S. Henderson c A. Kaboth c G. Kohse f R. Lanza g J. Monroe c
A. Roccaro a N. Skvorodnev b H. Tomita a R. Vanderspek c
H. Wellenstein b R. Yamamoto c
aPhysics Department, Boston University, Boston, MA 02215
bPhysics Department, Brandeis University, Waltham, MA 02454
cDepartment of Physics, MIT, Cambridge, MA 02139
dLaboratory for Nuclear Science, MIT, Cambridge, MA 02139
eMIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA 02139
fNuclear Reactor Laboratory, MIT, Cambridge, MA 02139
gDepartment of Nuclear Science and Engineering, MIT, Cambridge, MA 02139
Abstract
Direction measurement of weakly interacting massive particles in time-projection
chambers can provide definite evidence of their existence and help to determine their
properties. This article demonstrates several concepts for charge amplification in
time-projection chambers that can be used in direction-sensitive dark matter search
experiments. We demonstrate reconstruction of the “head-tail”effect for nuclear
recoils above 100 keV, and discuss the detector performance in the context of dark
matter detection and scaling to large detector volumes.
Key words: Dark Matter, Directional Detector, Nuclear Scattering, Optical
Readout, TPC, WIMP
PACS: 29.40.Cs, 29.40.Gx, 95.35.+d
? Corresponding author.
Email address: ddujmic@ (D. Dujmic).
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1 Introduction
Weakly interacting massive particles (WIMPs) are good candidates for con-
stituents of a dark-matter halo around our galaxy, and a target of several
experimental searches (see e.g. [1] for review). An annual oscillation in the
signal at the level of 1-2% was recently confirmed by DAMA collaboration [2].
If the asymmetry is due to Earth’s motion around Sun then much larger diur-
nal asymmetry in the WIMP direction is expected [5].
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