FAZIA detector for isospin φsics: status of the R&D program

Transcription

1 FAZIA detector for isospin φsics: status of the R&D program

2 NEED OF (A,Z) Identification + Coupling

3 LOI 18 «Although many apparatuses are available at present, the new experimental demands require a new detector system, FAZIA, which will be indispensable in future studies at SPIRAL2» (Résumé of general recommendations of the SAC of SPIRAL2, 2006) 72 persons 19 institutions 8 countries

4 FAZIA Working Groups 1. Modeling current signals and Pulse Shape Analysis 2. Physics cases FAZIA Project Management Board: 3. Front End Electronics 4. Acquisition 5. CsI(Tl) crystals 6. Single Chip Telescope 7. Design, Detector, Integration and Calibration 8. Web site B.Borderie, R. Borcea, R.Bougault, A.Chbihi, F.Gramegna, T.Kozik/J.Lukasik, I.Martel Bravo, E.Rosato, G.Poggi and R.Roy Tech. Coordinator: P.Edelbruck Sc. Coordinators: G.Poggi. and R.Bougault

5 Beyond E-E: Z and A Identification with Pulse Shape Low threshold because PSId. is done with ONE detector Pulse Shape in Silicon is possible: Stopped particles with the same energy and different Z (and A) show charge/current signals having unlike time evolution because ranges and plasma erosion times differ ntd-si 200 mm2 80 MeV Fully digital implementation of PSA in Silicon

6 GANIL INFN-LNS INFN-LNL

7 20x20 mm 2 E1 E2 Si Si CsI(Tl) 300µm 500µm Few cm

8 E1 E2 Si Si CsI(Tl)

9 E1 E2 Si Si CsI(Tl) 300µm 500µm Few cm Reverse mounted ntd Silicon detector

10 E1 E2 Charged Si Si CsI(Tl) Particle Particles stopped in the first ntd Silicon: Z and A identification by means of Digital Pulse Shape and Time of Flight

11 E1 E2 Charged Particle Si Si Particles stopped in the second Silicon: Z and A Digital Pulse Shape (E 2 ) +redundant identification by CsI(Tl) means of E 1 -E 2

12 E1 E2 Charged Si Si CsI(Tl) Particle Particles stopped in CsI(Tl): Z and A identification by means of E 2 (+ E 1 )-ECsI and Pulse Shape in CsI(Tl)

13 No photodiode E1 E2 Charged Particle Si Si CsI(Tl) A novel and efficient read-out scheme is under study for the second Silicon detector and the CsI(Tl), fully exploiting the features offered by digital signal processing

14 Current (I) and Charge (Q) Pulse Shape: Fast PACI pre-amplifier PACI actual version PACI first box-version Charge & Current outputs

15 Experiments with single silicon-detector (Tandem-Orsay, LISE-GANIL) Experiments with single silicon-detector & strip-detector (CIME/GANIL) & LNL (channeling & uniformity) Jan Jan Prototypes (phase1) LNL-experiment Jan ntd strip-detector LNS-test Jan LNS-experiment Jan GANIL-experiment

16 FAZIA «Single silicon detector» CIME(GANIL) & LNL-Experiments BEAM IMPLANTATION

17 FAZIA PHASE-I prototype LNL-Experiment 32 S+Al 15 A.MeV

18 FAZIA PHASE-I prototype LNS-Experiment (L.Bardelli, N.Le Neindre) 84 Kr+Ni 35 A.MeV ToF I & Q sampling variety Higher dynamic range + (now!) 132 Xe+Ni 35 A.MeV

19 DOPING UNIFORMITY

20 Beyond E-E: Z and A Identification with Pulse Shape Doping uniformity: ntd-silicon detector Regular Silicon: +/- 15% uniformity ntd silicon: below +/- 5%

21 non-homogeneity in the electric field inside the detector (doping) may have a severe impact over the Pulse Shape Discrimination capabilities: ntd A typical detector: ~9% nonuniformity A very good detector: ~1% nonuniformity ntd IMPROVEMENT IN DOPING UNIFORMITY FAZIA data (INFN-Firenze)

22 Beyond E-E: Z and A Identification with Pulse Shape Doping uniformity: ntd-silicon detector DIGITAL PULSE SHAPE on 500µm and 300µm Silicons with similar field and different doping non-uniformities: 300µm: ~ 4 GeV full scale 500µm: ~ 4 GeV full scale 140V on 300µm 9.4% non-uniformity P S Cl? Si Ar? Mg Al O FNeNa Be BCN B CN Be 250V on 500µm 1% non-uniformity S Cl Ar Al SiP K Ca Mg O F Ne Na +/- 5% is not enough PSId. needs +/- 0.5% It is possible (work with manufacturer) -

23 Beyond E-E: Z and A Identification with Pulse Shape Doping uniformity: ntd-silicon detector DIGITAL PULSE SHAPE on 500µm and 300µm Silicons with similar field and different doping non-uniformities: 300µm: ~ 4 GeV full scale 500µm: ~ 4 GeV full scale 140V on 300µm 9.4% non-uniformity P S Si IONS STOPPED IN ONE DETECTOR Mg Al O FNeNa Be BCN Cl? Ar? B CN Be 250V on 500µm 1% non-uniformity S Cl Ar Al SiP K Ca Mg O F Ne Na +/- 5% is not enough PSId. needs +/- 0.5% It is possible (work with manufacturer) -

24 Beyond E-E: Z and A Identification with Pulse Shape Doping uniformity: ntd-silicon detector DIGITAL PULSE SHAPE on 500µm and 300µm Silicons with similar field and different doping non-uniformities: 300µm: ~ 4 GeV full scale 500µm: ~ 4 GeV full scale Be BCN 140V on 300µm 9.4% non-uniformity B CN Be 250V on 500µm 1% non-uniformity P S S Cl? Cl Si Ar Mg Al SiP CONSEQUENCE Ar? K Ca Mg Al ON TIMING O F Ne Na O FNeNa +/- 5% is not enough PSId. needs +/- 0.5% -

25 CHANNELING

26 Channeled Random MeV MeV Channeled Random 1000 events 1000 events ns ns IMPROVEMENT IN SIGNAL DISPERSION FAZIA data (LNL)

27 LNL-Experiment

28 LNL-Experiment

29 CHANNELING Krypton CIME(GANIL)-Experiment)

30 Selenium CHANNELING LNL-Experiment

31 Selenium CHANNELING CONSEQUENCE ON TIMING LNL-Experiment

32 LNL-Experiment

33 FAZIA Working Groups 1. Modeling current signals and Pulse Shape Analysis 2. Physics cases 3. Front End Electronics 4. Acquisition 5. CsI(Tl) crystals 6. Single Chip Telescope 7. Design, Detector, Integration and Calibration 8. Web site CsI(Tl) R&D

34 CsI(Tl): tests concerning Tl concentration pulser 60Co-γ triple α source pulser

35 FAZIA Working Groups 1. Modeling current signals and Pulse Shape Analysis 2. Physics cases 3. Front End Electronics 4. Acquisition 5. CsI(Tl) crystals 6. Single Chip Telescope 7. Design, Detector, Integration and Calibration 8. Web site SCT results

36 A B Si1 E Si2 E CsI Single Chip Telescope: no photodiode A+B Separation algorithm using E and T rise Si1/Si2+CsI A B Si1/CsI FAZIA data (LNS) Si1/Si2

37 FAZIA Working Groups 1. Modeling current signals and Pulse Shape Analysis 2. Physics cases 3. Front End Electronics 4. Acquisition 5. CsI(Tl) crystals 6. Single Chip Telescope 7. Design, Detector, Integration and Calibration 8. Web site PSA results with good detectors and dedicated electronics LNL and LNS-test experiments

38 USUAL DE/E Id. WITH OUR DETECTOR SELECTION: FAZIA data (LNS)

39 USUAL DE/E Id. WITH OUR DETECTOR SELECTION: FAZIA data (LNS)

40 USUAL DE/E Id. WITH OUR DETECTOR SELECTION: ISOTOPIC SEPARATION UP TO Z=20-25 FAZIA data (LNS)

41 USUAL DE/E Id. WITH OUR DETECTOR SELECTION: ISOTOPIC SEPARATION UP TO Z=20-25 FAZIA data (LNS)

42 CHARGE (14bits, 100MS/s) CURRENT (12bits, 125MS/s) 1.3 GeV full range IONS STOPPED IN ONE DETECTOR PS Id. Low energy limit FAZIA data (LNL)

43 CHARGE (14bits, 100MS/s) CURRENT (12bits, 125MS/s) 1.3 GeV full range IONS STOPPED IN ONE DETECTOR (channel) PS Id. Low energy limit Counts Carbon Isotopes Efpga Carbon Isotopes Imax/Efpga Factor Of Merit FAZIA data (LNL) Factor Of Merit

44 14 bits 100MS/s 6 GeV full scale IONS STOPPED IN ONE DETECTOR PS Id. Low energy limit FAZIA data (LNS)

45 Why do we need INVERSE (low field) configuration?

46 INVERSE (rear) DIRECT (front) Pulse Shape of stopped particules is different: charge-carrier mobilities of electrons and holes, different plasma-erosion times

47 INVERSE (rear) DIRECT (front) Pulse Shape of stopped particules is different: charge-carrier mobilities of electrons and holes, different plasma-erosion times Si1 Si2 FR-telescope LNS-July 2009 Si2 Si1 E E R E E R

48 INVERSE (rear) DIRECT (front) Pulse Shape of stopped particules is different: charge-carrier mobilities of electrons and holes, different plasma-erosion times Si1 Si2 FR-telescope LNS-July 2009 Si2 Si1 E E R E E R 125 MS/s 12bits

49 Z=20 Z=10 Si1 Si2 E E R Again we see the good DE/E (A,Z) identification in reverse configuration for an other telescope.

50 ZOOM INVERSE (REAR) Si1 Si2 E E R PS Id. Low energy limit DIRECT (FRONT) Si2 Si1 E E R ZOOM

51 DIRECT versus INVERSE INJECTION Z=20 Z=22 About 110µm DATA FAZIA/LNS

52 DIRECT versus INVERSE INJECTION Z=20 Z=22 About 110µm DATA FAZIA/LNS

53 INVERSE (REAR) Si1 E Si2 E R Z=10 ZOOM Z=20 PS Id. Low energy limit Imax/Energy versus Energy

54 INVERSE (rear) DIRECT (front) Pulse Shape of stopped particules is different: charge-carrier mobilities of electrons and holes, different plasma-erosion times Threshold for Z=20 identification corresponds to Si-depth of About 50µm About 110µm

55 PUBLICATIONS: 1) L. Bardelli, M.Bini, G.Casini, G.Pasquali, G.Poggi, S.Barlini, A.Becla, R.Berjillo, B. Borderie, R.Bougault, M.Bruno, M.Cinausero, M.D Agostino, J.DeSanctis, J.A.Duenas, P.Edelbruck, E.Geraci, F.Gramegna, A.Kordyasz, T.Kozik, V.L.Kravchuk, L.Lavergne, P.Marini, A.Nannini, F.Negoita, A.Olmi, A.Ordine, S.Piantelli, E.Rauly, M.F.Rivet, E. Rosato, C.Scian, A.A.Stefanini, G.Vannini, S.Velica, M.Vigilante (for the ). Influence of crystal-orientation effects on pulse-shape-based identification of heavy-ions stopped in silicon detectors, NIM A, accepted 2) L.Bardelli, G.Poggi, G.Pasquali, M.Bini (for the FAZIA Collaboration). A method for non-destructive resistivity mapping in silicon detectors NIM A 602 (2009) ) S.Barlini, R.Bougault, Ph.Laborie, O.Lopez, D.Mercier, M.Parlog, B.Tamain, E.Vient, E.Chevallier, A.Chbihi, B.Jacquot, V.L.Kravchuk (for the FAZIA Collaboration). New digital techniques applied to A and Z identification using pulse shape discrimination of silicon detector current signals NIM A 600 (2009) ) M.Pârlog, H.Hamrita and B.Borderie (for the Fazia Collaboration). Description of current pulses induced by heavy ions in Silicon detectors NIM A, to be submitted 5) L.Bardelli, G.Poggi, M.Bini, G.Pasquali (Nucl-ex and FAZIA Collaboration). An efficient method for timing synchronization between many digital sampling channels NIM A 572 (2007) ) P.Napolitani, M.Colonna, F.Gulminelli, E.Galichet, S.Piantelli, G.Verde, E.Vient (for the FAZIA collaboration). Probing the nuclear equation of state in heavy-ion collisions at Fermi energy in isospin-sensitive exclusive experiments Physical Review C, to be submitted.

56 Within 2/3 years a demonstrator will be running. Coupling with existing multidetectors: CHIMERA GARFIELD INDRA in GANIL/LNS/LNL

57 Grazie to FAZIA team, Figures from L.Bardelli, N.Le Neindre, M.Parlog, G.Pasquali, P.Edelbruck, S.Barlini. Merci to SPIRAL2 Preparatory Phase FP7- Infrastructure (EU)

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