PARIS detectorAdam Maj

for the PARIS collaboration

PROMETEO 2011Valencia, 17-18 November, 2011

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 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

h) Multiple Coulex of SD bands 36<A<50 (P. Napiorkowski, F, Azaiez, A. Maj et al.)

i) Relativistic Coulex (after postacceleration)40<A<90 (P. Bednarczyk et al.)

j) Nuclear astrophysics (p,g)e.g. 90Zr (S. Harissopulos al.)

k) Shell structure at intermediate energies (SISSI/LISE)20<A<40(Z. Dombradi et al.)

l) 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+PARISD. Beaumel et al.

n) PDR in proton-rich nuclei with NEDA+PARISG. De Angelis et al.

o) Onset of chaotic regime: PARIS+AGATAS. Leoni et al.

p) Evolution of nuclear structure of 78Ni and 132Sn with ACTAR+PARISG.F. Grinyer et al.

PARIS physics cases for SPIRAL2

a) Jacobi and Poincare shape transitions (+AGATA) *130-142 Ba, 116-120Cd, 88-98Mo, 71Zn (A. Maj, J. Dudek, K. Mazurek et al.)

b) Studies of shape phase diagrams of hot nuclei – GDR differential methods186-193Os, 190-197Pt (I. Mazumdar, A. Maj et al.)

c) Hot GDR studies in neutron rich nuclei *(D.R. Chakrabarty, M. Kmiecik et al.)

d) Isospin mixing at finite temperature68Se, 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 (S. Courtin, D.G. Jenkins et al.)

* - flagship

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

‘Ideal’ - spherical

‘cubic’-like

‘radial’-like

CONCLUSION:PARIS made of clusters:Cluster = 9 phoswichesThis allows cubic or semi-spherical geometry

NaI(2”x2”x6”) PMT

LaBr32”x2”x2”

Basic element: a phoswich LaBr3+NaI

5 prototypes were ordered from Saint Gobain:1 to Orsay, 1 to Strasbourg, 3 to KrakowThey started to arrive 2 months ago

only LaBr3only NaI

LaBr3 + NaI

NaI(2”x2”x6”) PMT

LaBr32”x2”x2”

Source662 keV (137Cs)1173 keV (60Co)1332 keV (60Co)

Q(10

80 n

s)Q(120 ns)

Phoswich tests results

Present

End 2011

First half of 2012

Constructing one cluster

Simulations for one cluster made of 9 phoswiches

Full addback:LaBr3+ LaBr3_NaI+NaI

Partial addback:LaBr3+ LaBr3_NaI

Event generator for PARIS based on MC Cascadeg-

Fold

Angular momentumg-Fold<6 g-Fold>30

PARIS roadmapM

oU

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 PARISSimulation software for SHOGUN and PARIS Common physics cases with GASPARD and

NEDA in preparationWork started do adapt the Krakow RFD to

PARIS at SPIRAL2 beams experiments

SUMMARYLaBr3+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 soonThe 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.

Active working groups1. 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.)

PARIS Management boardA. Maj - project spokesman; D.G. Jenkins, J.P. Wieleczko, J.A. Scarpaci - deputies

PARIS Advisory CommitteeF. 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)

J. Pouthas – PARIS liaison to SPIRAL2 project management

paris.ifj.edu.pl

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

Electronics for PARIS

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 componentsDeal with fast signals of LaBr3: risetime <1ns, decaytime ~20 nsProvide 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 purposesMeasure energies 1-50 MeV with 3% resolution.Trigger less readout with timestampingBe compatible with GTS based DAQ

GAMMA-TELESCOPELaBr3(2”x2”)

CsI or BaF2(2”x6”)PMT PMT

E1

t1 t2

E2

CsI or BaF2(2”x6”)A

PD PMT

E1

t1 t2

E2

CsI(NaI)(2”x6”) PMT

E1,E2

LaBr3(2”x2”)

LaBr3(2”x2”)

I

II

IIIT1,T2

CAEN V1751 1 or 2 GHz digitizerTNT2 x4 (2.5 ns sampling)

Phoswich tests in Strabourg

O.Dorvaux, D.Lebhertz, C.Finck, et al

LaBr3

NaI

Resolution vs sampling frequency

IPHC (M.Rousseau)

0.7 1.1 1.3

100 MHz

400-1000 MHz

simple ’short gate’ integration

Jordanov trapezoid filter

IPHC

(M.R

ouss

eau)

Short gate Long gate

100 MHz sampling should be sufficientAlgorithm must be better tested

LaBr3 DE/E: 3.2% (1.7 MeV) 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)