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Dr Matt Dimmock |
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Contact Details:
Department of Physics |
AGATA: The first complete 4pi HPGe Detector Array |
Recent Work:
Quick Links : CV | Thesis | Presentations | Posters | Reports | Publications | Software | Pictures | NUCAM
CV |
My accademic CV
Thesis |
Characterisation of AGATA symmetric prototype detectors
:: April 2008
PhD thesis, University of Liverpool.
Presentations |
PPT files are password protected - For use by collaborators only.
AGATA: Detector characterisation and Pulse Shape Analysis (PSA)
:: Feb 2008 - Invited seminar at the University of Tennessee.
A seminar given at the University of Tennessee. This presentation summarises the progress of the the AGATA collaboration, with emphasis on the detector characterisation performed at the University of Liverpool.
Results from the characterisation of the 3 symmetric AGATA Prototype detectors
:: Feb 2007 - Nuclear Physics Group Meeting, Liverpool :: Mar 2007 - IoP Conference, Surrey.
A presentation given to the Liverpool Nuclear Physics Group in February 2007. This summarises all the work that has been undertaken for all 3 AGATA Prototype symmetric detectors.
Summary of the AGATA digitizer tests
:: Jan 2007 - AGATA Week, Orsay
A presentation given at AGATA Week 2007. This summarises the performance of the AGATA digitizer when connected to the S003 detector. Analogue and digital measurements were collected and compared.
Summary of the characterisation measurements from the S001, S002 and S003 AGATA symmetric prototype detectors
:: Jan 2007 - AGATA Week, Orsay
A presentation given at AGATA Week 2007. This presentation details the measurements taken with the S002 and S003 detectors. It also gives a contrast of the quality of the data from these detectors relative to that of the S001 detector.
A comparison of the performance of the S001 and S002 AGATA symmetric prototype detectors
:: June 2006 - AGATA Week, Liverpool. :: November 2006 - GRETINA Working Group, ORNL, Tennessee.
A presentation given at AGATA Week 2006. This analysis details the performance of the S002 detector and compares the quality of pulse shapes obtained with this detector, with those collected with the S001 detector.
Summary of the characterisation measurements tken with the AGATA S002 symmetric prototype detector.
:: May 2006 - AGATA Collaboration Meeting, Orsay
A presentation given to the AGATA Collaboration detailing measurements taken with the S002 crystal, both in Cologne and Liverpool. The data shown includes resolution measurements from digital and analogue acquisition systems
Results from the detailed analysis of AGATA S001 characterisation data.
:: February 2006 - Nuclear Physics Group Meeting
An overview presentation describing work achieved thus far on analysis of coincidence data collected from the scanning of the first symmetric AGATA detector. Information on the risetime analysis of averaged pulse shapes generated as a function of radius in the detector are presented.
Preliminary characterisation results from the from the First AGATA symmetric prototype detector.
:: November 2005 - AGATA Week, Strasbourg, France
A presentation describing the detailed analysis of coincidence data collected from the scanning of the first symmetric AGATA detector. Information on the risetime analysis of averaged pulse shapes generated as a function of radius in the detector are presented. This coincidence data has been filtered with tight rise-time gates. The results of this analysis are qualitatively compared to average risetime data from the singles scan of the detecor.
Analysis of coincidence line-scan data collected from the first AGATA symmetric prototype detector (S001).
:: June 2005 - Meeting with Dave Radford, ORNL, Tennessee
A presentation given firstly to the Medical Imagin Group (MIG) in May 2005, and then to Dave Radford at Oak Ridge in June 2005. This overview gives an insight into the quality of the coincidence data collected from the S001 AGATA detector. An initial attempt at generating average pulse shapes as a function of interaction position inside the detector is presented. The risetime results calculated from these pulses are then quantitatively compared to those generated from an early version of the electric field simulation code MGS.
Singles Polar Plots and Spectra from Initial AGATA Measurements
:: February 2005 - Medical Imaging Group Meeting
An initial overview of some of the problems encountered with the first singles scan of the first AGATA symmetric detector (S001).
Posters |
AGATA Prototype Detectors: Characterisation and Validation of the Electric Field Simulation Code, MGS
:: November 2006 - IEEE Conference, San Diego
Overview of the of the singles and coincidence measurements performed on the University of Liverpool scanning table. The coincidence measurements have been used for the partial validation of the E-field simulation code MGS (Multi Geometry Simulation), developed at IRES Strasbourg.
AGATA: The concept and initial characterisation measurements
:: April 2005 - IOP Conference, Manchester
Overview of the AGATA project highlighting the major concepts that will enable the array to function. This overview is then followed by results from some initial measurements taken from the first symmetric detector.
AGATA: PSA and Gamma-ray tracking with relevance to a Compton camera
:: March 2005 - IPEM Conference
This work outlines the concepts of Pulse Shape Analysis (PSA) and Gamma-Ray Tracking (GRT), and shows how a highly segmented germanium detector can be utilised as a Compton camera.
Reports |
AGATA detector characterisation : Preliminary report
:: February 2005
Brief report detailing the scan of the first symmetric AGATA detector.
Publications |
Gamma-ray tracking: Characterisation of the AGATA symmetric prototype detectors.
:: NIM B Ref 54708, in press (2007).
A.J. Boston, H.C. Boston, J.R. Cresswell, M.R. Dimmock, L. Nelson, P.J. Nolan, S. Rigby, I. Lazarus, J. Simpson, P. Medina, et al.
TRIUMF-ISAC Gamma-ray escape-suppressed spectrometer (TIGRESS): a versatile tool for radioactive ion beams.
:: Nuclear Physics A, 787, 118-125 (2007)
G.C. Ball, A. Andreyev, R.A. Austin, M.R. Dimmock et al.
The TRIUMF nuclear structure program and TIGRESS.
:: NIM B Ref 54668, in press (2007)
P.E. Garrett, A. Andreyev, R.A.E. Austin, G.C. Ball, D. Bandyopadhyay, J.A. Becker, A.J. Boston, H.C. Boston, R.S. Chakrawarthy, R. Churchman, D. Cline, R.J. Cooper, D. Cross, D. Dashdorj, G.A. Demand, M.R. Dimmock et al.
Characterisation of an AGATA symmetric prototype detector.
::NIM A573 (1-2): 153-156 (Apr 2007).
L. Nelson, M.R. Dimmock, A.J. Boston, H.C. Boston, J.R. Cresswell, P.J. Nolan, I. Lazarus, J. Simpson, P. Medinac C. Santos, C. Parisel.
Nuclear structure research at TRIUMF
:: Acta Phys. Polonica B, 38, 4, 1169-1178 (2007).
P.E. Garretta, A. Andreyev, R.A.E. Austin, G.C. Ball, D. Bandyopadhyay, J.A. Becker, A.J. Boston, M.R. Dimmock et al
In-beam test of the AGATA prototype triple cluster.
:: Acta Phys. Polonica B, 38, 4, 1297-1301 (Nov 2006).
F. Recchia, D. Bazzacco, E. Farnea, R. Venturelli, T. Beck, P. Bednarczyk, A. Burger, A. Dewald, M.R. Dimmock, et al.
Probing the maximally deformed light rare-earth region around the drip-line nucleus 130Sm.
:: Physica Scripta T125: 214-215 (July 2006)
M. Petri, E.S. Paul, P.J. Nolan, A.J. Boston, R.J. Cooper, M.R. Dimmock et al.
Gamma-Spectroscopy and radioactive beams: How to perform channel selection.
:: AIP Conference Proceedings, 831,541-543 (April 2006)
B. Rosse, N. Redon, O. Stezowski, Ch. Schmitt, D. Guinet, M. Meyer, Ph. Lautesse, P. J. Nolan ..... , M.R. Dimmock, et al.
Software |
Some MATLAB codes for processing experimental and simulated scan data.
Codes are password protected - For use by collaborators only.
Azimuthal mgs pulse shape correction (main routine)
:: Source Code
Main routine that produces charge pulses for azimuthal (r,theta,z) mgs output data. A correction for both the response of the preamplifier (Michael Schlarb) and the nyquist GRT high frequency filter (Matthew Dimmock) is also performed. The risetime and asymmetry parameters are attached to the end of the pulse train array.
Radial mgs pulse shape correction (main routine)
:: Source Code
Main routine that produces charge pulses for radial (x,y,z) mgs output data. A correction for both the response of the preamplifier (Michael Schlarb) and the nyquist GRT high frequency filter (Matthew Dimmock) is also performed. The risetime and asymmetry parameters are attached to the end of the pulse train array.
Load mgs azimuthal scan parameters (function)
:: Source Code
Function that loads mgs interaction position details into the main azimuthal routine
Load mgs radial scan parameters (function)
:: Source Code
Functionn that loads mgs interaction details into the main radial routine
Calculate image charge channels (function)
:: Source Code
Functionn that locates the nearest neighbour image charge channels. To be used with both azimuthal and radial routines.
Find enpoint of mgs pulse (function)
:: Source Code
Functionn that calculates the height and sample number at which the segment and outer contact charge pulses meet. To be used with both azimuthal and radial routines.
Interpolate mgs pulses (function)
:: Source Code
Functionn that interpolates the simulated pulse shapes from 1ns/sample to 0.5ns/sample. To be used with both azimuthal and radial routines.
Calculate mgs image charge asymmetry (function)
:: Source Code
Functionn that calculates the image charge asymmetry for (utilising the areas) for simulated pulse shapes. To be used with both azimuthal and radial routines.
Calculate mgs risetimes (function)
:: Source Code
Functionn that calculates the T5, T10, T30, T50, T90 and T95 for each charge pulse. To be used with both azimuthal and radial routines.
Calculate response of nyquist filter (function)
:: Source Code
Functionn that reconstructs pulse shapes after filtering out frequencies >40MHz. To be used with both azimuthal and radial routines.
Calculate the preamplifier risetime (function)
:: Source Code
Functionn that calculates the risetime of the AGATA preamplifiers. To be used with both azimuthal and radial routines.
Remap simulation channel numbers (function)
:: Source Code
Functionn that remaps the MGS channel numbers to equal those from the experimental data set. To be used with both azimuthal and radial routines.
Test for strange mgs pulse shapes (function)
:: Source Code
Functionn that determines if the mgs pulse shapes make physical sense.
Calculate hitsegment from azimuthal mgs coordinates (function)
:: Source Code
Functionn that determines the mgs interaction segment based on the (r,theta,z) coordinates.
Calculate hitsegment from radial mgs coordinates (function)
:: Source Code
Functionn that determines the mgs interaction segment based on the (x,y,z) coordinates.
Calculate expeimetal average pulse shape for azimuthal coordinates (main routine)
:: Source Code
Main routine that produces charge pulses for azimuthal (r,theta,z) experimental data. The data is gain matched, interpolated, decay corrected and resized. A Chi2 test is performed to reject the worst pulse shapes and then an average pulse train is calculated. The risetime and asymmetry parameters are attached to the end of the pulse train array.
Calculate expeimetal average pulse shape for radial coordinates (main routine)
:: Source Code
Main routine that produces charge pulses for radial (x,y,z) experimental data. The data is gain matched, interpolated, decay corrected and resized. A Chi2 test is performed to reject the worst pulse shapes and then an average pulse train is calculated. The risetime and asymmetry parameters are attached to the end of the pulse train array.
Load experimental azimuthal scan parameters (function)
:: Source Code
Functionn that loads experimental interaction details into the main azimuthal routine
Load experimental radial scan parameters (function)
:: Source Code
Functionn that loads experimental interaction details into the main radial routine
Determine experimental azimuthal interaction segment (function)
:: Source Code
Functionn that calculates the interaction segment from the experimental r-theta position coordinates.
Determine experimental radial interaction segment (function)
:: Source Code
Functionn that calculates the interaction segment from the experimental x-y position coordinates.
Gain match eperimental data (function)
:: Source Code
Functionn that gain matches the experimental data using the baseline difference coefficients for the S002 detector .
Interpolate experimental pulse (function)
:: Source Code
Functionn that performs moving 5 point interpolation and 3 point smoothing. The resulting pulses have 1 sample / 2.5ns, as apposed to 1 sample / 12.5ns.
Correct for the decay of the preamplifier (function)
:: Source Code
Functionn that corrects for the 45us decay constant of the preamplifier circuit. Thus giving pulses with increased magnitude and a flat top.
Rescale experimental charge pulses (function)
:: Source Code
Functionn that calculates the height of the outer and centre contact.
Rescale experimental non-charge pulses (function)
:: Source Code
Functionn that rescales all image charge magnitudes relative to the centre contact magnitude.
Calculate experimental rise times (function)
:: Source Code
Functionn that the risetime parameters for experimental charge pulses. The output array contains the T5, T10, T30, T50, T90 and T95 sample points.
Time align experimental pulses (function)
:: Source Code
Functionn that aligns the T5 value of consecutive pulse shaped to a fixed array point..
Reject outlying experimental pulses (function)
:: Source Code
Functionn that calculates the Chi2 and standard deviation distributions for experimental pulse shapes and rejects those that lie outside of a user specified threshold.
Calculate experimental image charge asymmetry (function)
:: Source Code
Functionn that calculates the image charge asymmetry for experimental data.
AGATA Pictures |
