posted Feb 2, 2012, 8:33 AM by Ryan Martin
updated Feb 6, 2012, 8:02 AM
Location: 425 OLC (Old LeConte Hall, UCB)
Time: 1:30pm, refreshments at 1:15pm
Speaker: Azriel Goldschmidt (LBNL)
Title: Xenon electroluminescent TPC for precise energy measurement and ionization track imaging
At LBNL we have built a high-pressure xenon electroluminescent Time Projection
Chamber (TPC). In it ionization electrons drift to a region where they each produce
O(1000) UV photons. A fraction of these photons are detected by an array of
photo-multipliers inside the high-pressure volume providing a measurement of the
total energy deposited with high statistical precision. For 662 keV gamma rays from
137Cs we have obtained a 1% FWHM energy resolution. in addition, an array of silicon
photo-multipliers (SiPMs or MPPCs) will soon be installed near the light production region
to produce signals that enable the reconstruction of the ionization tracks.
This is a prototype device towards a 100 kg enriched 136Xe NEXT experiment for the
search of neutrino-less double beta decay.