PARIS and PARIS Electronics

Report
PROMETEO 2011
Valencia, 17-18 November, 2011
PARIS desing concepts:
Design and build high efficiency detector
consisting of 2 shells (or 1 phoswich shell)
for medium resolution spectroscopy
and calorimetry of g-rays in large energy range
Inner sphere, highly granular, made of new crystals (LaBr3(Ce)), to be used as
a multiplicity filter of high resolution, sum-energy detector (calorimeter), detector
for the gamma-transition up 10 MeV with medium energy resolution. It may
serve also for fast timing application.
Outer sphere, with high volume detectors, made of conventional crystals (BaF2
or NaI), to be used for high-energy photons measurement or as an active shield
for the inner shell..
2-shell or phoswich concept, in addition to being more economic, shall help to
distinguish a high-energy photon from a cascade of low energy gamma
transitions in fusion evaporation reactions
PARIS physics cases for SPIRAL2
h)
* - flagship
a) Jacobi and Poincare shape transitions (+AGATA)
*
i)
j)
k)
c) Hot GDR studies in neutron rich nuclei *
(D.R. Chakrabarty, M. Kmiecik et al.)
68Se, 80Zr, 84Mo, 96Cd, 112Ba
(M. Kicińska-Habior et al.)
e) Onset of the multifragmentation and the GDR
(+FAZIA)
120<A<140, 180<A<200
(J.P. Wieleczko, D. Santonocito et al.)
f) Reaction dynamics by means of g-ray
measurements
214-222Ra, 118-226Th, 229-234U
(Ch. Schmitt, O. Dorvaux et al.)
g) Heavy ion radiative capture *
24Mg, 28Si
Nuclear astrophysics (p,g)
e.g. 90Zr
(S. Harissopulos al.)
186-193Os, 190-197Pt
d) Isospin mixing at finite temperature
Relativistic Coulex
(after postacceleration)
(P. Bednarczyk et al.)
(A. Maj, J. Dudek, K. Mazurek et al.)
(I. Mazumdar, A. Maj et al.)
36<A<50
(P. Napiorkowski, F, Azaiez, A. Maj et al.)
40<A<90
130-142 Ba, 116-120Cd, 88-98Mo, 71Zn
b) Studies of shape phase diagrams of hot nuclei –
GDR differential methods
Multiple Coulex of SD bands
Shell structure at intermediate
energies (SISSI/LISE)
20<A<40
l)
(Z. Dombradi et al.)
Shell structure at low energies
(separator part of S3) *
30<A<150
(F. Azaiez, I. Stefan, B. Fornal et al.)
m) PDR studied with GASPARD+PARIS
D. Beaumel et al.
n)
PDR in proton-rich nuclei with
NEDA+PARIS
G. De Angelis et al.
o)
Onset of chaotic regime:
PARIS+AGATA
S. Leoni et al.
p) Evolution of nuclear structure of 78Ni
and 132Sn with ACTAR+PARIS
G.F. Grinyer et al.
PARIS has to

be transportable (between different facilities)

be modular (to be connected with other detectors:
AGATA, GASPARD, NEDA, FAZIA, ACTAR ...)

have high granulation (multiplicity measurement,
Doppler correction,...)

have very high efficiency for high-energy g-rays

have good timing resolution (<500 ps)

have energy resolution as good as possible

have some position sensitivity
Several geometries studied
‘cubic’-like
‘Ideal’ - spherical
‘radial’-like
CONCLUSION:
PARIS made of clusters:
Cluster = 9 phoswiches
This allows cubic or semispherical geometry
Basic element: a phoswich LaBr3+NaI
LaBr3
2”x2”x2”
NaI
(2”x2”x6”)
PMT
5 prototypes were ordered from Saint Gobain:
1 to Orsay, 1 to Strasbourg, 3 to Krakow
They started to arrive 2 months ago
only LaBr3
only NaI
LaBr3 + NaI
NaI
(2”x2”x6”)
PMT
Source
662 keV (137Cs)
1173 keV (60Co)
1332 keV (60Co)
Q(1080 ns)
LaBr3
2”x2”x2”
Q(120 ns)
Phoswich tests results
Constructing one cluster
Present
End 2011
First half of 2012
Simulations for one cluster made of 9 phoswiches
Full addback:
LaBr3+ LaBr3_NaI+NaI
Partial addback:
LaBr3+ LaBr3_NaI
g-Fold
Event generator for PARIS based on MC Cascade
Angular momentum
g-Fold<6
g-Fold>30
MoU
PARIS roadmap
Meeting in Orsaym 15.09.2011: Decision to go for MoU for PARIS Phase2
(2012-2015), to be signed in January 2012 (France, Poland, India, Italy,….)
Other activities:
Puls shape analysis: electronics for PARIS shall be
based on NUMEXO2 solution (synergy with
EXOGAM2 and NEDA)
Simulation software for GASPARD and PARIS
Simulation software for SHOGUN and PARIS
Common physics cases with GASPARD and
NEDA in preparation
Work started do adapt the Krakow RFD to PARIS
at SPIRAL2 beams experiments
SUMMARY
 LaBr3+NaI phoswich is a viable solution for the elements of the
eventual PARIS calorimeter, in terms of it meeting the
requirements for energy and timing resolution
 The next step is to explore the performance of a cluster of 9
phoswich detectors - this phase has already begun with 5 (4)
detectors delivered and a further 4 on order
 In-beam testing of this cluster will proceed soon
 The next phase will be a demonstrator of 4 clusters each of 9
phoswich detectors.
 At our meeting in September 2011, we have established the
framework for the next stage through discussion of the form of an
MoU, which we hope to have received sufficient signatures by
January 2012.
PARIS Management board
A. Maj - project spokesman;
D.G. Jenkins, J.P. Wieleczko, J.A. Scarpaci - deputies
PARIS Advisory Committee
F. Azaiez (F) -chairman, D. Balabanski (BG), W. Catford (UK), D. Chakrabarty (India),
Z. Dombradi (H), S. Courtin (F), J. Gerl (D), D. Jenkins (UK) - deputy chairman,
S. Leoni (I), A. Maj (PL), I. Matea (F), Ch. Schmidt (F)
Active working groups
1. Simulations (O. Stezowski et al.)
2. PARIS mechanical design scenarios (S. Courtin, D. Jenkins et al.)
3. Physics cases and theory background (Ch. Schmitt et al.)
4. Detectors (O. Dorvaux et al.)
5. Electronics (P. Bednarczyk et al.)
6. PARIS-GASPARD synergy (J.A. Scarpaci et al.)
J. Pouthas – PARIS liaison to SPIRAL2 project management
F. Azaiez, D. Balabanski, P. Bednarczyk, J. Bettane, C. Bonnin, S. Brambilla,
M. Ciemała, D.R. Chakrabarty, S. Courtin, A. Czermak, O. Dorvaux, M. Dudeło,
C. Finck, A.K. Gourishetti, G. Hull, M. Jastrząb, D. Jenkins, M. Kmiecik, S. Kumar,
D. Lebhertz, I. Matea, I. Mazumdar, K. Mazurek, P. Medina, C. Mehdi, V. Nanal,
P. Napiórkowski, J. Peyre, J. Pouthas, M. Rousseau, O. Roberts, Ch. Schmitt,
O. Stezowski, J.P. Wieleczko, T. Zerguerras and M. Ziębliński
paris.ifj.edu.pl
Piotr Bednarczyk
Basic requirements for the PARIS electronics
Serve 200-1000 detector channels (energy and time per channel)
Perform pulse shape analysis for disentanglement of overlapping
signals from a phoswitch components
Deal with fast signals of LaBr3: risetime <1ns, decaytime ~20 ns
Provide gamma time and energy relative to an external signal
Stand rates up to 100 kHz per channel
Keep time resolution better than 1 ns, for TOF purposes
Measure energies 1-50 MeV with 3% resolution.
Trigger less readout with timestamping
Be compatible with GTS based DAQ
GAMMA-TELESCOPE
E1
I
LaBr3
(2”x2”)
CsI or BaF2
(2”x6”)
PMT
PMT
t1
t2
E1
E2
APD
II
LaBr3
(2”x2”)
CsI or BaF2
(2”x6”)
PMT
t1
III
t2
E1,E2
LaBr3
(2”x2”)
CsI(NaI)
(2”x6”)
E2
PMT
T1,T2
Phoswich tests in Strabourg
O.Dorvaux, D.Lebhertz,
C.Finck, et al
CAEN V1751 1 or 2 GHz digitizer
NaI
TNT2 x4 (2.5 ns sampling)
LaBr3
Resolution vs sampling frequency
IPHC (M.Rousseau)
100 MHz
400-1000 MHz
0.7
1.1
1.3
simple ’short gate’ integration
IPHC (M.Rousseau)
Jordanov trapezoid filter
Short gate
LaBr3 DE/E: 3.2% (1.7 MeV)
100 MHz sampling should be sufficient
Algorithm must be better tested
Long gate
NaI DE/E: 5.1% (1.7 MeV)
NUMEXO MEZZANINE for PARIS
A hybrid consisted of analog (CFD) and digital electronics for time
and energy determination respectively
PSA (Jordanov ?)
-in VIRTEX6 or mezzanine (power consumption issue)
Milano solution for timing : signal pre-shaping (analog cirquit)

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