3 research outputs found
Mapping the Sensitive Volume of an Ion-Counting Nanodosimeter
We present two methods of independently mapping the dimensions of the
sensitive volume in an ion-counting nanodosimeter. The first method is based on
a calculational approach simulating the extraction of ions from the sensitive
volume, and the second method on probing the sensitive volume with 250 MeV
protons. Sensitive-volume maps obtained with both methods are compared and
systematic errors inherent in both methods are quantified.Comment: 27 pages, 8 figures. Submitted to JINST, Jan. 16 200
Progress with Xenon Liquid Hole Multipliers
The bubble-assisted Liquid Hole Multiplier (LHM) is a recently-proposed
concept for the combined detection of ionization electrons and primary
scintillation photons in noble-liquid time projection chambers. The LHM
comprises a perforated micro-pattern electrode (e.g. Thick Gas Electron
Multiplier - THGEM, or Gas Electron Multiplier - GEM) immersed in the liquid,
with a bubble of the noble gas supported underneath. Ionization electrons and
scintillation-induced photoelectrons extracted from a cesium iodide
photocathode drift through the electrode's holes and induce electroluminescence
(EL) signals in the bubble; these are recorded by photon detectors located
closely below the electrode. We present recent results in the development of
LHMs, comparing the response of different electrodes to ionization and
photon-induced electrons.Comment: Presented at 2016 IEEE NSS/MIC, Strasbourg, France, 29 October - 5
November 201