Speaker
Dr
Steven Moon
(University of Liverpool)
Description
The Advanced Gamma Tracking Array (AGATA) project is a pan-European collaboration whose aim is the construction of a next-generation gamma-ray spectrometer for use in nuclear structure studies. The final array will consist of 180 (coaxial) HPGe crystals arranged in a spherical honeycomb geometry. Utilising the technique of gamma-ray tracking, the array will significantly improve upon the performance of large, Compton-suppressed HPGe arrays currently in use in laboratories around the world (e.g. Gammasphere).
A fundamental requirement of gamma-ray tracking is accurate Pulse Shape Analysis (PSA). This technique allows identification of the spatial locations of gamma-ray interactions within each detector volume, which itself is divided into 36 segments. The 36 segment output signals (along with the coaxial core output signal) require precise analysis in order to accurately assess the aforementioned gamma-ray interaction position, and computations must be performed rapidly for the technique to be of use in real-time experimental scenarios.
The most practicable method here is to pre-simulate a database of signal bases for each detector, which maps the detector response for interactions at all spatial coordinates within its volume. This is then compared, in real-time, with signals received from the detector in order to isolate the gamma-ray interaction position. It is thus imperative that confidence in the accuracy of such simulations is assured.
In addition to the standard ‘coincidence scan’ method used at Liverpool, other experimental techniques via which simulated detector bases may be validated are desirable. One example under development involves assessing the experimental and simulated responses of the detector whilst set below its recommended operating voltage, allowing study of depletion region evolution as a function of applied voltage. Another focuses on the implementation of a novel pulse shape analysis technique to determine gamma-ray interaction position within the detector volume. Current work will be presented.
Preferred medium (Oral/poster)
Oral
Author
Dr
Steven Moon
(University of Liverpool)
Co-authors
Dr
Andy Boston
(University of Liverpool)
Mr
Carl Unsworth
(University of Liverpool)
Dr
Dan Judson
(University of Liverpool)
Dr
Helen Boston
(University of Liverpool)
Dr
John Cresswell
(University of Liverpool)
Prof.
Paul Nolan
(University of Liverpool)
Ms
Samantha Colosimo
(University of Liverpool)
