neutron detection
DESCRIPTION
Neutron detection. DEMON. present time : DEMON, TONNERRE, EDEN, HENDES, LAND, ORION, … neutron wall. good neutron detection arrays but. - often compromise (intrinsic efficiency, energy range, angular resolution,...). - become old. - incompatible with safety rules. - PowerPoint PPT PresentationTRANSCRIPT
present time : DEMON, TONNERRE, EDEN, HENDES, LAND, ORION, … neutron wall
Neutron detection
good neutron detection arrays but
- often compromise (intrinsic efficiency, energy range, angular resolution,...)- become old
- incompatible with safety rules
DEMON
+ 13 years old 1st experiment: 1994
organic liquid component (NE213): dangerous
VXI electronics: expensive and obsolete
very good performances
Détecteur Modulaire de Neutrons(modular neutron detector)
Détecteur Modulaire de Neutrons
~100 cells: liquid scintillators NE213
L=20cm, =16 cm
n- discrimination :
- pulse shape analysis : Qtot-Qlent
- separation with time of flight
E t (t~1.2 ns)
, scintillator position
cross-talk < 1%
very high intrinsic efficiency
modular detector
SYREP: proton rejection system 45 thin scintillators (3 mm)
n < 0.5%
- electronics: VXI standard - independent acquisition system
n- discrimination :
- pulse shape analysis: Qtot-Qlent
- separation with time of flight
Détecteur Modulaire de Neutrons
Détecteur Modulaire de Neutrons
Détecteur Modulaire de Neutrons
… and very resistant !
+ 10 years old 1st experiment: 1994
organic liquid component (NE213): dangerous
VXI electronics: expensive and obsolete
very good performances
CYCLONE, Louvain-la-neuve
GANIL, Caen
SARA, Grenoble
VIVITRON, Strasbourg
U400, JINR, Dubna
TANDEM, Catane
K500, Texas A&M, College Station
SATURNE, Saclay
TSL, Uppsala
KVI, Groningen
JYFL, Jyväskylä… and widely used ! Dynamics of dissipative reactions at intermediate energies
many domains investigated in physics:
Capture dynamics at low energy in the heavy and superheavy mass region
Structure of light neutron rich nuclei
Transmutation of nuclear waste
….
- existing material used for the neutron detection:
- liquids: NE213 dangerous
cannot be used under vacuum
- cristals: anthracen - stilben very expensive
response = function of incident angle
difficult to manufacture big volumes- polymers: plastics no n- discrimination
- no new development since 1970’s !
projects …?
- origin of the discrimination (fluorescence) not well understood
from DEMON
2 steps:
answer: end 2007 …
2- construction a new detector(s)
- solid or liquid
- digitised electronics (~ ok)
SATAN ….?
ANR "Neutromania" (French Ministry of Research)
start of project: 05.12.05
duration 24 months
collaboration: IPHC-ISMRA-CEA
physicists + chemists
1- development of a new component - solid
- performances ≥ DEMON (n- discrimination, …)
Neutromania
to SATAN
S.. A.. T.. A.. Neutrons
Who is interested ?
- AZ4 collaboration: SATAN (> 1000 cells)
neutrons
E of LCP
- DEMON collaboration
- … ?
J. Pluta, F. Hanappe et al, GANIL, 1998
Interferometry (n,n), (p,p), (n,p)40Ar + 58Ni, 78 A.MeV
DEMON = belgian-french detector
collaboration: - ULB Brussels
- UCL Louvain-la-neuve
- LPC Caen
- IPHC Strasbourg
begin, 1994: many people
2007: very few people…
Neutromania (NT05-2_43664 /ANR-05-BLAN-0190-01)
- title: Neutron detection for science, industry, security and space
- grant: 190 k€
- duration: 24 months (dec. 2005-dec. 2007)
- partners: - IPHC-Strasbourg: - L.Stuttgé, O.Dorvaux, J.Devin (IPHC: nucl. phys.)
- J.M.Jung, R.Barillon (IPHC: nucl. chem.)
- L.Douce (IPCMS: chem.)
- E.Bouajila (PD: chem.)
- ISMRA-Caen: - M.Marqués, B.Tamain (LPC: nucl. phys.)
- T.N.Pham, P.J.Madec (LCMT: chem.)
- T. Dalet (PD: chem.)
- CEA-Saclay: - S.Normand, P.Delacour, B.Bazin (Dép. des Techn. du Capt. et du Signal: phys.)
- V.Simic, P.Raimond (Laboratoire Cellules et Composants: chem.)
- M.Hamel (PD: chem.)
- consulting persons: - F.Hanappe (nucl. phys. + chem.) (ULB, Brussels)
- F.Tondeur (appl. of detection) (ISIB, Brussels)
Neutromania (NT05-2_43664 /ANR-05-BLAN-0190-01)
- job description: develop a new scintillating material
1) - solid
- discriminating n-
- fast (fast component ~ 1 ns)
- good quantum efficiency
- transparent to its own emitting light
2) - usable under vacuum
- easy to polish
- cheep
synthesis of polymers presenting numerous multiple delocated bonds
able to excite triplet states which allow the n- discrimination
chemical characterisation composition, nature, length of the chain, molecular weight, boiling point,
emission and absorption spectra , … physical characterisation (Cf source, 4MV acc., …) discrimination, resolution, efficiency,…
new component
thickness: ~5 mm
new component
thickness: ~5 mm
First results
NE213
thickness: 5 cm
we need ~1 year more to finalize
thickness: 5 cm
NE213
AmBe source
Qslow
Qtot
thickness: 20 cm
NE213
DEMON
AmBe source
Qslow
Qtot
thickness: 20 cm
NE213
DEMON
What about electronics ?
future detector(s) digitised electronics
What do we need to measure ?
pulse shape discrimination n- total and slow/fast charge energy time of flight
electronics group of Strasbourg
TNT and TNT2 cards dedicated to spectroscopy
development dedicated to neutrons
n- discrimination: has been tested in Caen and in Strasbourg
no major problem
time of flight: some development necessary
electronics group of Caen
development of digitised electronics