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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 1
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 2
Radiation Safety. Amplified.
Recent developments in HPGe detectors
AT CANBERRA (MIRION TECHNOLOGIES)
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 3
Presentation Summary
Presentation of CANBERRA (Mirion Technologies)
Key expertise and technologies
Recent HPGe detector developments
Recent HPGe developments in HPGe detectors
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 4
Radiation Safety. Amplified.
CANBERRA Presentation of the company
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 5
Radiation Safety. Amplified.
Key elements of the merger
CANBERRA is part of Mirion Technologies since July 1 st, 2016
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 6
Radiation Safety. Amplified.
TechnologiesExpertise and know-how overview
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 7
Radiation Safety. Amplified.
Project Management
► Long background in both developingadvanced technologies (specialtydetectors) and large-scale products(standard detectors)
► Technology Readiness Level (TRL) typically from 3 to 9
Key expertise and technologies
Project Management
(and QA)
Technology Readiness
Levels as originally
developed by NASA in
the 1980s
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 8
Radiation Safety. Amplified.
Project Management
Semiconductor Process
► Large know-how and proprietaryprocesses (segmentation, passivation)
► Full and redundant set of processequipment for Si, Si(Li) and Ge: shaping, PVD, CVD, implantation, diffusion, outgassing / annealing capabilities
► Thin layer characterization capability(thickness, stress, reliability, charge carrier life time)
► Management of clean / radiopureenvironments
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 9
Radiation Safety. Amplified.
Project Management
Semiconductor Process
Mechanics, vacuum and cryogenics
► Development of low-vibration and long-life cryocoolers for HPGe
► Improved thermal balance (necessary for electrical cooling)
► Proprietary technologies to hold and encapsulated HPGe detectors.
► Long experience with UHV process
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
Mechanics
Vacuum Cryogenics
CP5+ CP5
controller
CL5
(new)
Classical
LN2
dewar
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 10
Radiation Safety. Amplified.
Project Management
Semiconductor Process
Mechanics, vacuum and cryogenics
Ultra-low background
► Systematic characterization, traceability and underground storage of radiopure materials
► Collaboration with international low-background laboratories and experiments (double B decay, Dark Matter, neutrino scattering)
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
Mechanics
Vacuum Cryogenics
Ultra-lowbackground
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 11
Radiation Safety. Amplified.
Project Management
Semiconductor Process
Mechanics, vacuum and cryogenics
Ultra-low background
Electronics
► Strong expertise in analog electronics
► Continuous challenge for low-noise, high count rate, low power, multi-channel and more integrated electronics
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
Mechanics
Vacuum Cryogenics
Ultra-lowbackground
Electronics
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 12
Radiation Safety. Amplified.
Project Management
Semiconductor Process
Mechanics, vacuum and cryogenics
Ultra-low background
Electronics
Signal Processing
► Pulse shape analysis techniques transferred fromphysics to industrial applications
► Growing know-how with digital acquisition to characterize multichannel detectors
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
Mechanics
Vacuum Cryogenics
Signal Processing
Ultra-lowbackground
Electronics
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 13
Radiation Safety. Amplified.
Project Management
Semiconductor Process
Mechanics, vacuum and cryogenics
Ultra-low background
Electronics
Signal Processing
Nuclear Measurement (spectroscopy)
► Alpha, beta, gamma and x-ray spectroscopy isrecognised as core competency of CANBERRA
► For Lingolsheim, particularly large experience with lowbackground, low noise and multichannel spectroscopy
► In-depth modelling of detectors during design and characterization phases
Key expertise and technologies
Semiconductorprocess
Project Management
(and QA)
Mechanics
Vacuum Cryogenics
Nuclearmeasurement
Signal Processing
Ultra-lowbackground
Electronics
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 14
Radiation Safety. Amplified.
Recent developmentsOverview of some specialty products
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 15
Radiation Safety. Amplified.
Airborne HPGe spectrometer (2013)
Rel. efficiency up to 1100% in addback mode
Electrically cooled (with UPS)
Turn-key system for real time mapping of radionuclides
Large efficiency spectrometer
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 16
Radiation Safety. Amplified.
Ongoing development of ultimate low-noise x-ray spectrometer
► Novel ultra low capacitance detector
► New generation analog front-ends
► Low noise and miniaturized contacting methods
Targetted performance:
To be combined with advanced DAQ chains and signal processing techniques
Low-noise x-ray detector
Parameter Unit Value
FWHM @ 6 keV 0.1µs [eV] 160
FWHM @ 6 keV 12µs [eV] 120
FWHM @ 14 keV 0.1µs [eV] 200
FWHM @ 60 keV 12µs [eV] 330
FWHM @ 122 keV 12µs [eV] 450
Max. ICR [cps] 2-3Mcps
195eV@6keV 0.1µs Shaping
Newgeneration
Former generation
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 17
Radiation Safety. Amplified.
Main applications: Dark Matter search and neutrino scattering experiments
Continuous records in PC detectors volume
► Current target: 2.4 kg
Continuous improvement in electronic noise
► Current target: FWHM < 50 eV @ pulser
Low noise - low background point contact detector
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 18
Radiation Safety. Amplified.
Combination of
► excellent energy resolution at low and highenergies (simillar to Point Contact / BeGeconfigurations)
► maximum efficiency (similar to well detectors)
Also offers lower depletion voltage with respect to point contact (SAGe) configuration of the same volume
SAGe™ Well detectors
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 19
Radiation Safety. Amplified.
Inverted Coaxial detector
► Long drift time on purpose for improved position resolution
► See R.J. Cooper et al., NIM A 665 (2012) 25
1st segmented prototype (2012)
► For ORNL currently tested in Berkeley
► N-type crystal
2st segmented prototype (in indevelopment)
► For Univervisity of Liverpool (SIGMA)
► P-type crystal
→ Talk of Laura Harkness in this workshop for details
Inverted (point contact) coaxial detector
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 20
Radiation Safety. Amplified.
Developments of HPGe wafers with micrometric pixelsWafers are coupled to user ASICS (e.g. Medipix 3)
Application: imaging or very high count rates
Down to 55µm; arrays of chips possible
Advantage of Germanium
► High efficiency and stopping power► High quality & large diameter wafers available
Fine pixel imagers
Flat field with much
less flaws than other
high Z materials
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 21
Radiation Safety. Amplified.
Mid-term industrial challenge: developmentof 3rd generation radiation imagers, combining high detection efficiency and hig-resolution spectroscopy
Spectro-imagers (Compton cameras)
Setup of the imaging experiment
137Cs
134Cs134Cs
image of 137Csimage of 134Cs
1.4 m
Example of industrial application: waste drum imaging in Fukushima
Single electricaly-cooled DSSD
for Compton imaging (Si(Li) or
HPGe)
Courtesy of Dr. Motomura (Riken Kobe)
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B. PIRARD, Recent HPGe developments at CANBERRA 1st PSeGe Workshop, Orsay, 4 October 2016 p. 22
Radiation Safety. Amplified.
Already good inputs (challenges) collected from previous talks in this workshop
Energy resolution
► Still room for noise improvement at low energy (from 100 eV down to a few tens eV):
− Small detectors with high count rates, mostly for x-ray spectroscopy
− large PCGe detectors have for Dark Matter experiments
Count rate
► For x-ray spectroscopy, detectors, electronics and signal processing suited for more than 1Mcps withoutresolution degradation
Position sensitivity
► Relevance of count rate requirements and sensitivity to trapping ?
► Need for increased segmentation ?
Detection efficiency
► Better match of application needs ?
Operation
► Increasing need for electrically cooled detectors, even for scientific applications
Recent HPGe developements: trends