Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sub-Penning gas mixtures: new possibilities for ton- to kiloton-scale
  time projection chambers   In this work, we present the concept for large low-background experiments in
which an unusual gas mixture gas serves as a seamless, high-QE,
near-100\%-coverage photodetector for scintillation or \cerenkov photons. We
fill a large time projection chamber with a VUV scintillating gas, plus an
unusually small admixture dopant gas with a low ionization threshhold (and a
high ionization yield), akin to a highly-underquenched Penning mixture.
Scintillation photons travel far from a primary ionization site before
converting into photoionization electrons. Using standard TPC methods, we can
separately count both the primary ionization electrons (which occur along a
dense track) and the scintillation-ionization electrons (which will occur over
a large spherical region) without the use of PMTs. The scheme is compatible
with very large detectors, in both two-phase and single-phase high pressure
configurations. We discuss how the drift-axis position of an event can be
reconstructed, and under what constraints we can expect stable gas gain
operations. We propose some detectors illustrating how this scheme---both in
conventional two-phase geometries, as well as in pressurized space in
solution-mined salt cavern---makes it possible to safely construct gas time
projection chambers of previously-unreachable target masses, capable of
studying dark matter, double beta decay, proton decay, and solar neutrinos;
more speculative gas mixtures might extend the technique to reactor and
geoneutrinos

37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc