GASPARD Collaboration: recent activities at BARC, Mumbai

Transcription

1 GASPARD Collaboration: recent activities at BARC, Mumbai K. Mahata, A. Shrivastava, J. Gore, S. K. Pandit, V. V. Parkar, P. Patle Nuclear Physics Division Bhabha Atomic Research Centre, Mumbai

2 Plan of the talk Introduction BARC participation R&D with si strip detectors Test experiment at PLF, Mumbai Summary & Outlook

3 AIM : Optimal study of reactions with beams from SPIRAL2, FAIR(LowE), HIE-Isolde, SPES From SISSI/SPIRAL to Light ions (A 40) Heavier ions (Fission fragments) Optimized for PA GA coincidences E* resolution gain>10 w/r particles only High efficiency for w/r MUST2/TIARA/EXOGAM Gamma spectroscopy of populated states : A 4 particle array fully integrable in major gamma arrays (PARIS, AGATA, EXOGAM2)

4 Other features of Excellent PID for light particles PSA technique for particle ID Integration of special targets Pure and windowless H or D Cooled 4He or 3He gas Triton targets for e.g. (t,p) 0+2 states, pairing, etc Any solid target e.g. 6Li, 7Li for p, a, transfer Polarized targets (require high intensities) Capability to handle high intensity beams Large dynamical range Easy coupling with spectrometers

5 13 LoI s related to SHELL EVOLUTION How Magic is Ni? 78 W.Catford, O.Sorlin Spectroscopic studies around 78 Ni and beyond N=50 via transfer and coulex G.De France, A.Gadea, X.Valiente, R.Orlandi Neutron shell evolution in weakly bound 134,135 Sn via (d,p) reactions V.Lapoux, O.Sorlin PAIRING Probing the pairing interaction through two-neutron transfer reactions D.Beaumel Study of pair transfer in O.Sorlin, K.Wimmer Sn via 134 Sn(t,p) 132 2p capture on 15O and proton correlation in 2p emission from excited states of 17Ne M.Assié, F. De Oliveira CLUSTERS Exploration of cluster breakup in light nuclei J.A.Scarpaci, M.Assié + NEAR BARRIER REACTIONS, PDR, ASTROPHYSICS,

6 How Magic is 78Ni? Catford Sorlin N=48,50 Zn,Ge(d,p) (d,t) Spectroscopic studies around 78 Ni and beyond N=50 via transfer & coulex De France, Gadea, Valiente- Dobon, Orlandi 73,75,77 74,76,78,80 Neutron shell evolution in weakly bound 134,135Sn via (d,p) reactions Lapoux, Sorlin Probing the pairing interaction through two-neutron transfer Beaumel 132 Sn (p,t) Study of pair transfer in 134Sn 132 via Sn(t,p) Sorlin, Wimmer 132 Sn(t,p) 2p capture on O and proton Assié, de correlation in 2p emission from Oliveira excited 17Ne 15 Transfer to bound and unbound Shrivastava, states and its influence on Chatterjee reaction dynamic Exploration of cluster breakup in light nuclei Scarpaci, Assié Gamma transition probability in unbound nuclei Stefan, de Oliveira 79 Cu,81Ga, Zn, 86,88 Zn, Se,84Ge (d,p),(t, ), Coulex 15 Sn(d,p) 13 MeV/u O(3He,n) 10 MeV/u Tit2 target EXOGAM/AGAT A DIAMAN/SPIDER CD2, ACTAR CHyMENE CHyMENE Tit2 target NEDA 2 GASPARD O Elastic, Transfer, Breakup, Fusion EXOGAM/AGATA Pb target No spectrometer 14,15,16 O, 20 MeV/u Breakup PARIS O(p, ) 5.3, 5.6 MeV/u PARIS? 14 14

7 design GAmma SPectroscopy and PArticle Detection GASPHYDE design adopted as the working solution Beam Trapezoidal shapes for endcaps Option: Annular detectors Layers of Silicon : 300(500) m DSSD pitch < 1mm (to be developed by BARC) 2x [1.5 mm DSSD pitch~3mm] (FWD) 1x [1.5 mm DSSD pitch~3mm] (BWD) ELECTRONICS: ~ channels (Digital) Preamps to be in vacuum Integration of special targets (cryogenic, )

8 Si detectors developments at BARC Mumbai BARC, Mumbai joined the GASPARD collaboration French-Indian LIA Meeting, Oct 2010 A. Shrivastava is a member of the GASPARD Management board. Prototype DSSDs to be built by BHARAT Electronics BEL supplied ~ 2000 Si detectors to LHC/CERN 32 channel pre-shower detectors Other production: Microstrip detectors (470 m pitch) Various PIN diodes Si-PIN diodes Workplan: Develop standard DSSD (delivery : end of 2011) Process final-geometry GASPARD detectors of mid-thickness (300 m) with ntd wafers (BEL/ MICRON) Tests to be done at the BARC-TIFR heavy-ion facility

9 Working group meeting on at BARC, Nov 21st, 2011 Attendees : A.Shrivastava, A. Topkar, K. Mahata, V. Jha, K. Ramachandran, P. Patle, S. Pandit, BARC Mumbai (C. Bhattacharya, VECC Kolkata) D. Beaumel, IPN Orsay Purpose : Establish PID capabilities using PSA with small-pitch Silicon DSSD Schematic Workplan: (On line with previously agreed WP) Orsay/Huelva : Develop ntd DSSD (MICRON SC & Barcelona) Test under beam with digital bench BARC: Develop standard & ntd DSSD with BEL, non- rectangular from MIcron Test under beam with digital bench

10 R&D for the Si array PULSE SHAPE ANALYSIS 1) The use of strips 2) Energy limits 3) Homogeneity of the silicon wafers 4) Channeling effects 5) Charge/current input 6) Sampling rate/resolution 7) Detector thickness dependence 8) PSA and radiation damage Within the program is lead by the Huelva group IPNO in charge of simulations of detector s response Collaboration with the FAZIA group

11 Preliminary spectra E (MeV) ntd monocell detectors from CANBERRA (FAZIA) 2x2 cm2, thickness: 500 m reverse and normal mouting 6mm collimator Preamps : PACI with boosted Q gain ~ 32 mv / MeV Digitizers: TNT-2 cards MHz Imax (a.u.) E (MeV) Imax (a.u.) Imax : maximum of the current signal J.Duenas, V. Parkar, Huelva U. Imax (a.u.) Imax (a.u.)

12 7 Li (35MeV) + 12C France Low statistics (4 hrs beamtime) will be repeated soon For low energies, E vs. Imax show better identification of Z and A than E vs. Risetime

13 Test at Orsay & Padova

14 Experimental Setup for digital pulse shape analysis E: 30 E: 300 E-E 500 ntd Si pad 2cm x 2cm provided by Orsay Rear side injection Collimator: 6 mm 500 ntd Beam Time: October 14-15, 2012 Beam: 7Li, 20, 30, 35 MeV Target: 89Y, 197Au, 12C Signal processing: Digital as well as analog

15 Analog Processing 1. MSI-8: Mesytec preamplifier, shaper, timing filter, sum timing 2. PACI with Ortec amplifier 13 bit ADC Digital Processing PACI (Orsay) charge out put was digitized using indigenously developed FPGA based High speed Data acquisition board

16 Card Details Form factor: 6U. FPGA:VIRTEX-5 XC5VFX100T cpci interface: 32 bit, 33MHz master interface with DMA transfer capability using PCI 9054 from PLX Technology. Clock: MHz clock oscillator for SFP; 40 MHz clock oscillator for PCI; 32 MHz system clock; Clock distribution for ADC and DAC; can accept external clock also. Rocket IO interface: Two SFP connectors are provided for SFP module. Memory: 2GB DDR2 SDRAM; 256Mb flash Memory Analog Input: Two channels using 12 bit, 1.0 GSPS ADC: ADC12D1000 from National Semiconductor Configuration: JTAG Mode; Using On-board Configuration PROM.

17 The card Single channel, only charge signal recorded 8 channel card expected soon

18 Typical pulses Li + 197Au ns pre-trigger (adjustable) 2.5 s recording interval (adjustable Li + 89Y 7 Time (ns) Time (ns)

19 Trapezoidal Filter T T TG 7 Li + 197Au Counts = 100 kev Analysis using ROOT Pulse Height

20 Risetime 90% 10% TR = 1.4 ns Li + 197Au Counts 7 Rise time (ns)

21 Energy vs Rise time (7Li +197Au) Rise time (ns) 225V Energy

22 Energy vs Rise time (7Li +12C) Rise time (ns) 225V Energy

23 Energy vs Rise time: (7Li +89Y) Rise time 225V Li 7 Z=1 Energy Li 6

24 Energy vs rise time: effect of depletion voltage Rise time 300V 250V 225V 200V Energy

25 Energy vs Rise time and DE-E (mass separation) Rise time 225V 7 6 Li Li Z=1 7 Energy Li E 6 Z=1 E Li

26 Summary and outlook A test experiment to study digital pulse shape analysis has been carried out Only charge signal have been digitized using indigenously developed high speed FPGA based card Effect of depletion voltage has been studied Charge as well as mass separation have been achieved BARC in collaboration with BEL is developing 300m DSSD 1st prototype 64x 64 strip DSSD has been received Test DSSD with source and beam Thank you

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28 Collaboration GAmma SPectroscopy and PArticle Detection M.Assié, D. Beaumel, N. De Séréville, S.Franchoo, F.Hammache, J.A. Scarpaci, I.Stefan (IPN Orsay, France) W.N. Catford (Univ. of Surrey, UK) M. Labiche (STFC Daresbury, UK) A.Chatterjee, K. Mahata, A. Shrivastava, (BARC Mumbai, India) L. Acosta, R.Berjillos, J.Duenas, I.Martel, V. Parkar, A.Sanchez-Benitez (Univ. of Huelva, Spain) A.Corsi, F.Druillole, A.Gillibert, L.Nalpas, E. Pollacco (SphN/IRFU, Saclay, France) A. Chbihi, F. De Oliveira, O.Sorlin (GANIL, France)

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30 PSA test experiment at Orsay tandem J.Duenas, V.Parkar, R. Berjillos, Univ of Huelva M.Assie, D.Beaumel, B.Genolini, T.Faul, V. Le Ven, IPNO D. Mengoni, INFN Padova GASPARD-HYDE-TRACE May 2011 DETECTORS 1) 70 m SSD, 5x5 cm2 2) 500 m ntd, 2x2 cm2 (one reverse mounted) from FAZIA (canberra) 3) 300 m PAD detectors TRACE prototype (FBK Trento) beam Preamplifiers: PACI (IPNO) PARC-05 (IPNO) BW ~ 400 MHz BW ~ 600 MHz MEASURED: Elastic scattering on Au 1.5, 2, 4, 10 MeV 1.5, 2, 2.5, 10 MeV 7 12, 18, 34 MeV Reaction : 7 Li + 12C at 34 MeV (9 UT of beam in total)

31 Next step: test with new detectors from MICRON SC Made of ntd wafers from TOPSIL Small pitch (500 m) High density connectors Special packaging with narrow frames Delivered Oct 2011

32 Forthcoming test experiment at IPNO tandem (Feb 2012) 3-stages telescopes being prepared : PACI preamplifiers (IPNO) GANIL DAQ with ~ 20 digital channels (MATACQ boards) Monoenergetic beams + reaction

33 Worplan for 2012 ORSAY/HUELVA Test experiment at IPNO tandem (February) 3 telescopes with new ntd protos 1 telescope monocell (Fazia) 1 telescope of TRACE (pads) Data analysis conclusion start detailed design of final detectors MUMBAI Develop numerical bench get preamplifiers (PACI) test cards choose/purchase digitizer MATACQ (CAEN) integrate in DAQ Delivery of standard DSSDs from BEL (June) Test with -source and beam BEL standard DSSD MICRON sc ntd detectors

34 PSA test experiment at GANIL with DSSD (FAZIA & GASPARD/HYDE collab.) 500 m ntd, 5x5 cm2, 16X+16Y (3mm pitch) 3+4 unmasked (MICRON SC, Topsil wafers) rear mounted Placed between 300 m Fazia as E and CsI as ER PACI Preamps, 3.6mV/MeV & 3000V/A 125 Msamples/s, 12 bits PSA with DSSD works PSA on one-side only: OK From A. Chbihi Rise time vs Energy

35 Preliminary spectra ntd monocell detectors from CANBERRA (FAZIA) 2x2 cm2, thickness: 500 m reverse and normal mouting 6mm collimator Preamps : PACI with boosted Q gain ~ 32 mv / MeV Digitizers: TNT-2 cards MHz Imax : maximum of the current signal J.Duenas, V. Parkar, Huelva U.

36 Forthcoming test experiment at IPNO tandem Detectors from MICRON SC ntd wafers from TOPSIL ntd