open30openDe Luca, S.; Acosta, L.; Auditore, L.; Boiano, C.; Cardella, G.; Castoldi, A.; D'Andrea, M.; De Filippo, E.; Dell'Aquila, D.; Fichera, F.; Gnoffo, B.; Guazzoni, C.; Lanzalone, G.; Lombardo, I.; Martorana, N. S.; Minniti, T.; Norella, S.; Pagano, A.; Pagano, E. V.; Papa, M.; Pirrone, S.; Politi, G.; Quattrocchi, L.; Rizzo, F.; Russotto, P.; Sacca', G.; Trifiro', A.; Trimarchi, M.; Verde, G.; Vigilante, M.De Luca, S.; Acosta, L.; Auditore, L.; Boiano, C.; Cardella, GIUSEPPE MICHELE OSVALDO; Castoldi, Andrea; D'Andrea, M.; De Filippo, E.; Dell'Aquila, D.; Fichera, F.; Gnoffo, B.; Guazzoni, Chiara; Lanzalone, G.; Lombardo, I.; Martorana, N. S.; Minniti, T.; Norella, S.; Pagano, A.; Pagano, E. V.; Papa, M.; Pirrone, S.; Politi, G.; Quattrocchi, L.; Rizzo, F.; Russotto, P.; Sacca', G.; Trifiro', A.; Trimarchi, M.; Verde, G.; Vigilante, M

Acosta, L.

Auditore, L.

Boiano, C.

Cardella, G.

Castoldi, A.

D'Andrea, M.

De Filippo, E.

De Luca, S.

Dell'Aquila, D.

Fichera, F.

Gnoffo, B.

Guazzoni, C.

Lanzalone, G.

Lombardo, I.

Martorana, N. S.

Minniti, T.

Norella, S.

Pagano, A.

Pagano, E. V.

Papa, M.

Pirrone, S.

Politi, G.

Quattrocchi, L.

Rizzo, F.

Russotto, P.

Saccà, G.

Trifirò, A.

Trimarchi, M.

Verde, G.

Vigilante, M.

International audienceIn this paper we present the results of the tests on the new digital electronics GET (General Electronics for Tpc), which will be used for the readout of the CsI(Tl) detectors of CHIMERA (Charged Heavy Ion Mass and Energy Resolving Array) and for the new correlator FARCOS (Femtoscope ARray for COrrelations and Spectroscopy). The new electronics allows us to digitize the full waveform of the signals produced by the detector. Among its features it is worth noticing the compactness and low power consumption (5W for 256 channels). Tests have been performed with pulsers, radioactive sources and ion beams. With such electronics very good results in energy resolution and isotope separation of the detected fragments were obtained, by using both hardware and software filters

de Luca, S.

d'Andrea, M.

de Filippo, E.

Martorana, N.S.

Pagano, E.V.

HAL-IN2P3

Test of GET Electronics for the CHIMERA and FARCOS multi-detectors

Saccà, G.

Trifirò, A.

Archivio della ricerca - Università degli studi di Napoli Federico II

CINECA IRIS Institutial research information system UNISS

HAL Descartes

HAL: Hyper Article en Ligne

Sacca', G.

Trifiro', A.

CARDELLA, GIUSEPPE MICHELE OSVALDO

CASTOLDI, ANDREA

GUAZZONI, CHIARA

Archivio istituzionale della ricerca - Politecnico di Milano

DOI 10.1393/ncc/i2016-16411-xColloquia: IWM-EC 2016IL NUOVO CIMENTO 39 C (2016) 411Test of GET Electronics for the CHIMERA and FARCOSmulti-detectorsS. De Luca(1), L. Acosta(2)(3), L. Auditore(1), C. Boiano(4), G. Cardella(3),A. Castoldi(4)(5), M. D’Andrea(3), E. De Filippo(3), D. Dell’Aquila(6),F. Fichera(3), B. Gnoffo(3)(7), C. Guazzoni(4)(5), G. Lanzalone(8)(9),I. Lombardo(6), N. S. Martorana(8)(10), T. Minniti(11), S. Norella(1),A. Pagano(3), E. V. Pagano(8)(10), M. Papa(3), S. Pirrone(3), G. Politi(3)(10),L. Quattrocchi(3)(10), F. Rizzo(8)(10), P. Russotto(3), G. Sacca`(3),A. Trifiro`(1), M. Trimarchi(1), G. Verde(3)(12) and M. Vigilante(6)(1) INFN, Gruppo Collegato di Messina and Dip. di Scienze Matematiche ed Informatiche,Scienze Fisiche e Scienze della Terra, Universita` di Messina - Messina, Italy(2) Instituto de F´ısica, Universidad Nacional Autonoma de Mexico - Mexico City, Mexico(3) INFN, Sezione di Catania - Catania, Italy(4) INFN, Sezione di Milano - Milano, Italy(5) Dip. di Elettronica, Informazione e Bioingegneria, Politecnico di Milano - Milano, Italy(6) INFN, Sezione di Napoli and Dip. Fisica, Universita` di Napoli - Napoli, Italy(7) CSFNSM-Centro Siciliano Fisica Nucleare e Strutura della Materia - Catania, Italy(8) INFN, Laboratori Nazionali del Sud - Catania, Italy(9) Universita` Kore - Enna, Italy(10) Dipartimento di Fisica e Astronomia, Universita` di Catania - Catania, Italy(11) CNR-IPCF - Messina, Italy(12) Institut de Physique Nucle´aire, CNRS/IN2P3, Universite´ Paris-Sud 11 - F-91406 OrsayCedex, Francereceived 10 January 2017Summary. — In this paper we present the results of the tests on the new digitalelectronics GET (General Electronics for Tpc), which will be used for the readout ofthe CsI(Tl) detectors of CHIMERA (Charged Heavy Ion Mass and Energy ResolvingArray) and for the new correlator FARCOS (Femtoscope ARray for COrrelationsand Spectroscopy). The new electronics allows us to digitize the full waveform ofthe signals produced by the detector. Among its features it is worth noticing thecompactness and low power consumption (5W for 256 channels). Tests have beenperformed with pulsers, radioactive sources and ion beams. With such electron-ics very good results in energy resolution and isotope separation of the detectedfragments were obtained, by using both hardware and software ﬁlters.Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0) 12 S. DE LUCA et al.1. – IntroductionAt the intermediated energies, i.e., starting from Fermi ones (∼ 30MeV/nucleon) upto few GeV/nucleons, the studies of reaction dynamics and nuclear structure betweenHeavy Ions collisions (HI) are faced with the detection of a large number of particles(both charged and neutral) produced in the ﬁnal states. Many eﬀorts have been done inrecent years to cover the complex problems arising in such studies [1]. In recent years,the equation of state (EoS) of the asymmetric nuclear matter and in-medium nucleareﬀective interactions have attracted much interest in the nuclear and the astrophysicalcommunity [2, 3]. Motivated by this physics background and experimental complexity,with the beginning of the new millennium at the LNS (Laboratori Nazionali del Sud) ofINFN in Catania the construction of a second-generation device, the 4π multi-detectorCHIMERA (Charged Heavy Ion Mass and Energy Resolving Array) was accomplished [4].The CHIMERA detector is equipped with electronics in discrete components that allowedto identify fragments and light charged particles in charge and-or mass in a wide dynamicrange [5]. Evidently, a wide number of investigations performed in heavy-ion collisionresearches the required multi-particle correlation measurements of high both angular andenergy resolution. In fact, light particles and fragments are abundantly produced duringthe overall dynamical evolution of the reactions from the most peripheral to centralcollisions covering an impressive time scale from fast (few tens of fm/c) to sequentialdecay (hundreds of fm/c). The stringent requirements pencilled above triggered alsothe design of a new ancillary FARCOS detection array [6]. This work is devoted tostudy and characterization of the compact GET electronics; in fact the ﬁnal FARCOSarray constituted by 5 modules (20 telescopes, in the ﬁnal project) needs to managemore than 2500 channels. Moreover the 4π CHIMERA CsI(Tl) front-end electronics(1192 detectors) is now obsolete. Our choice was to develop a ﬁrst stage front-endcircuit for FARCOS (including new ASIC pre-ampliﬁers) and new dual-gain modulescoupled to a compact hardware architecture covering digitalization and signal readout,syncrhonization and trigger functions. These last aspects are covered by the GET project.By using the compact GET electronics we have several relevant advantages; for examplefew racks will be enough for all FARCOS and CHIMERA (CsI detectors) electronicsand we will use only 5W for 256 channels, so the total power consumption will bemuch lower than the present (for CHIMERA we need now about 60 kW of power on10 racks).2. – GET Electronics descriptionGET electronics is based on the AGET [7] (Asic for General Electronics for Tpc)circuit. Each ASAD (Asic Support and Analog-Digital conversion) card houses 4 AGETASICs and 4 12-bit ADCs. Each AGET handles up to 64 channels and therefore eachASAD card accepts up to 256 channels. The digital outputs of the 4 ADCs are transmit-ted with a maximum speed of 1.2Gbit/s to the CoBo board. The CoBo (ConcentrationBoard) manages up to 4 ASAD, therefore 4 CoBo manage more than 4000 electronicchannels. The CoBo is responsible of applying a time stamp, zero suppression and com-pression algorithms to measured data. It will also serve as a communication intermediarybetween the ASAD and the outside world with a maximum speed of 1Gbit/s per CoBo.The MUTANT (MUltiplicity Trigger ANd Time) card manages the multiplicity condi-tions for the trigger and distribution of the clock on the whole system. The MUTANT ca-pability of accepting external triggers or providing trigger outputs allows communicationTEST OF GET ELECTRONICS FOR THE CHIMERA AND FARCOS MULTI-DETECTORS 3Fig. 1. – Digitized waveforms (red lines in both panels) of a Silicon detector (left panel) and of aCSI(Tl) scintillator (right panel), digitally ﬁltered signals used to determine the signal amplitude(green lines in both panels) and ﬁltered signals used to determinate the rise-time (blue lines inboth panels).with diﬀerent acquisition systems. The global data are transmitted through the networkswitch to the computer farm with a maximum speed of 10Gbit/s for the storage andonline analysis. The AGET chip includes 64 channels handling each one detector unit.The architecture is based on the AFTER chip [8] with signiﬁcant new features and mod-iﬁcations to match very diﬀerent detector needs. The main characteristics are ﬂexibilityand programmability of the system. One can easily change the gain, adjust the requiredtiming of single read out and adapt the trigger system to a given experiment not onlyusing the information on channel multiplicity but also on the position of ﬁred channel.A read-out channel integrates mainly: a charge sensitive preampliﬁer, an analogue ﬁlter(shaper), a discriminator for trigger building and a 512-sample analogue memory. Animportant feature of GET electronics is that you can choose, for each AGET, at whichstage of the channel chain to apply the input signal, i.e. charge preampliﬁer input, ana-logue ﬁlter input, analogue memory input. To identify fragments in charge and in massduring our test we chose the hardware ﬁlter input (16 values in the range of 70 ns to 1μs)and we used numerical triangular ﬁlters on the digitized signals to determine the signalamplitude and the rise-time of the signals (ﬁg. 1).3. – Experimental qualiﬁcationPreliminary tests with internal pulser and external pulser and radioactive sourceshave been performed in order to probe the integral nonlinearity of GET electronics andthe reliability of the internal trigger even at low multiplicity values. We probed theperformance of the GET electronics coupled with a single CHIMERA telescope (bothSilicon detector and CsI(Tl) scintillator) with proton beam at 62MeV on various tar-gets. The elastic scattering peaks observed in the reactions were used for the particleenergy calibration. As expected, energy calibration is practically linear in the investi-gated range of dynamics (∼ 100); however a small quadratic term must be added tomatch calibration at low energy for the CsI channels. During the CLIR experiment [9], afragmentation beam on hydrogenated plastic was used. Using the GET electronics we gotthe ΔE-E identiﬁcation matrix reported in ﬁg. 2. The comparison between this matrixand the one obtained with classical electronics during the UNSTABLE experiment high-lights the better isotopic separation achievable with the GET electronics at least up toCarbon ions.4 S. DE LUCA et al.Fig. 2. – Two ΔE-E identiﬁcation matrixes obtained from the same telescope with GET Elec-tronics (left panel) and the standard CHIMERA acquisition (right panel). We used fragmenta-tion beams at 50AMeV on a plastic target in both experiments.4. – ConclusionsWe characterized the performance of the GET electronics and evaluated the feasibil-ity of its use for the readout of the CHIMERA and FARCOS telescopes. The possibil-ity of using adjustable numerical ﬁlters allows improvements on the CsI(Tl) resolution.Regarding the silicon channel we observe that a very good energy resolution can be at-tained allowing to satisfy isotopic identiﬁcation also at very low released energy (theenergy loss of 62MeV proton in silicon is only 500 keV). The dynamic range is limited,therefore two GET readout channels per detector readout channel are needed. Moreoverone of the advantages of digital acquisition is the fact that the pedestal is measured eventby event (by measuring the baseline of the preampliﬁer signal) and, consequently, sub-tracted. Therefore the ﬁt calibration line must intercept the zero and small nonlinearitiescharacterizing CsI(Tl) can be easily measured. In addition, the signal is completely dig-itized and saved, allowing a more accurate oﬄine analysis thus improving the resolution.The reduction of power dissipation and the decrease in size of the GET electronics (anASAD card as large as a VME card) make the system transportability easier.REFERENCES[1] Cardella G. et al., these Proceedings and references therein.[2] Li B.-A., Ramos A. Verde G. and Vidana I. (Editors), Nuclear Symmetry Energy,Topical Issue, Eur. Phys. J. A, 50 (2014).[3] De Filippo E. and Pagano A., Eur. Phys. J. A, 50 (2014) 32; Russotto P. et al., Phys.Rev. C, 91 (2015) 014610; Russotto P. et al., Phys. Rev. C, 94 (2016) 034608; De FilippoE. et al., Acta. Phys. Pol. B, 40 (2009) 06011; Cardella G. et al., Phys. Rev. C, 85 (2012)064609.[4] Pagano A. et al., Nucl. Phys. A, 734 (2004) 504; Pagano A., Nucl. Phys. News, (2012)22.[5] Alderighi M. et al., Nucl. Instrum. Methods A, 489 (2002) 257; Leneindre N. et al.,Nucl. Instrum. Methods A, 490 (2002) 251; Alderighi M. et al., IEEE Trans. Nucl. Sci.,52 (2005) 1624.TEST OF GET ELECTRONICS FOR THE CHIMERA AND FARCOS MULTI-DETECTORS 5[6] Pagano E. V. et al., EPJ Web of Conferences, 117 (2016) 10008; Verde G. et al., J.Phys. Conf. Ser., 420 (2013) 0112158; TDR FARCOS, https://192.84.151.50/joomla/;Acosta L. et al., J. Phys.: Conf. Ser., 730 (2016) 012001, p. 1.[7] Pollacco E. et al., Phys. Procedia, 37 (2012) 1799.[8] Baron P. et al., IEEE Trans. Nucl. Sci., 55 (2008) 1744.[9] Dell’Aquila D. et al., EPJ Web of Conferences, 117 (2016) 06011.

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Test of GET Electronics for the CHIMERA and FARCOS multi-detectors

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