PARIS collaboration:
WG Detectors
Report status
Olivier DORVAUX
Institut Pluridisciplinaire Hubert Curien
Université Louis Pasteur de Strasbourg
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Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Introduction
Status report and general remarks for the detector WG:
•delay
of the planning with main causes : financial support, long choice of
material and its delivery
•lack
of information in the frame of the PARIS collaboration : because of
non-dedicated financial support, there is many interactions with other
projects.
One possible issue : support from the ANR. What’s about the FP7?
Plan of the talk :
•ANR and Detector WG
•Complete description of the bench test
•Agenda-planning
•attempt of a protocol for testing detectors
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2
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
ANR :
PROVA : PROtotype for a Versatile γ-array
ANR : French National funding Agency for Research
For PARIS, a way to get a financial support :
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4 French laboratories : IPHC Strasbourg, IPN Lyon, IPN Orsay, GANIL
(+ international collaboration)
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Scientific and Technical Correspondants : M. Rousseau (IPHC - Main
coordinator of the project), O. Stezowski (IPNL), F. Azaiez (IPNO) and
J.-P. Wieleczko (GANIL)
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5 Work Packages : Detection-Scintillators (WP1), Digital electronics Pulse shape analysis (WP2), Mechanics (WP3), Simulations (WP4) and
Physics case (WP5)
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656 k€ has been requested (including material, travel expenses and
salaries for Postdoc positions)
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Issue : before summer. What to do if the request is rejected ?
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3
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
ANR and Detector WG
WP1 : Detectors
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Gaining expertise on new γ-rays scintillation materials, lanthanum halides
(LaBr3:Ce and LaCl3:Ce)
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Validation of a phoswhich concept of a LaBr3:Ce bounded with a CsI(Na)
Definition of a protocol with Saint-Gobain to control the mechanical
stability of the phoswich
WP2 : Signal and electronics
• Exploration of various solutions for the light collection (WavelengthShifter, coupling with APD or PM) and find the best option
• Finding the best solution for the neutron-gamma discrimination (fast
electronics, pulse shape analysis, digitalization)
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4
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
ANR and Detector WG : 3 main configurations
(LaBr3:Ce + APD)
+ BaF2
(LaBr3:Ce + Light guide + PM)
+ BaF2
γ
Phoswich
LaBr3 + CsI(Na)
γ
γ
Advantages:
• compact
• Good efficiency
• Good energy and
timing resolution
Advantages:
• Good efficiency
• Good timing resolution
Advantages:
• Compact
• Good efficiency
Forseen problems :
• stability with tpre
• Interface LaBr3APD
Forseen problems :
• light collection from the
LaBr3
• Mechanics
Forseen problems :
• light collection
from the LaBr3
• Timing Resolution
from the LaBr3
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5
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Bench test
Mechanics :
• cube 40x40x40 cm3 in Aluminium
• hermetically closed
• in a near future could be under primary
vaccum
• flanges with lemo, HV and LV, and light
guide
• position of the APD (S8664_1010) on a
Cu plate which could be cooled down
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6
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Bench test
Temperature control : +/- 0,1 °C
•
Cooled down by a cryogenic system
LAUDA in a range of -20°to +60°C
• remote control
• Cryogenic power ~ 0,5 kW
• estimated power to be dissipated ~50 W
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Temperature measurement
• DS600 detectors with a precision of
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+/-0.5°C, but a very good linearity in a
range of -40 to +125°C. Performances
could increase with a voltage regulation
High precision multimeter for detector
calibration in a range of -20° to 40°C
with a precision of +/- 0,017°C
remote control with a labview interface
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7
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Bench test
Detectors and Electronics :
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LaBr3 (1,5 x 1,5 inches from CSNSM)
APD S88664 10x10 mm2
Photoelectron sources for APD tests: collimated
LSO crystal (photoelectron rate ~ 20 Hz) and high
precision laser diode (PILAS)
Pre-amplifier :charge sensitive (ORTEC 142AH)
Amplifier : standard ORTEC spectroscopy amplifier
Keithsley model 237 HV = high stability
Digital electronics : TNT2 cards (10 ns sampling)
Total Cost (Mechanics, Temperature control, HV,
photoelectron source) : 24,5 k€ from AP IN2P3
and fundings from the lab
Fundings at IPHC 2008 : 14 k€ from IN2P3
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8
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Tests : Proposition of agenda
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LaBr3 will be available from end of may up to end of June.
We propose to perform some tests on the caracteristics of the APD
standing alone and coupled with a LaBr3 crystal during this period.
If enough time we will test the coupling with a light guide and a PM
tube
The next period of tests is planned from September 8th to end of
September. We would need a LaBr3 otherwise. Could it be possible
to buy some dedicated to PARIS project
What’s about other tests in York, Krakow, Milano, Ganil?
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9
Introduction
ANR Request
Bench test description
Agenda - Planning
Conclusion
Conclusion and attempt for a test protocol
Lot of work to be done, needs some common money ... deadline for the prototype?
Attempt of a measurement protocol for PARIS:
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Crystal and/or photodetector cooled down or tested at room
temperature : needs a high precise temperature control
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Charge sensitive preamplifier (Ortec 142AH type)
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Standard spectroscopic amplifier with shaping time from 1 to 8 μs
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Standard sources used : 137Cs, 60Co, AmBe for efficiency, energy
resolution and neutron-gamma discrimination
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Timing resolution : time difference with a fast detector : BaF2 Hector
or Chateau de Cristal type
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Neutron-gamma discrimination : by time measurement and/or charge
measurement. have also to investigate a pulse shape analysis.
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