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

Plan of the talk

Introduction

BARC participation

R&D with si strip detectors

Test experiment at PLF, Mumbai

Summary & Outlook

: A 4 particle array fully integrable in major gamma arrays (PARIS, AGATA, EXOGAM2)

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 …

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)

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

SHELL EVOLUTION How Magic is 78Ni ? W.Catford, O.Sorlin Spectroscopic studies around 78Ni and beyond N=50 via transfer and coulex G.De France, A.Gadea, X.Valiente, R.Orlandi Neutron shell evolution in weakly bound 134,135Sn 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 134Sn via 132Sn(t,p) O.Sorlin, K.Wimmer 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,…

13 LoI’s related to

How Magic is 78Ni ? CatfordSorlin

N=48,50 Zn,Ge(d,p)(d,t)

Spectroscopic studies around 78Ni and beyond N=50 via transfer & coulex

De France, Gadea, Valiente- Dobon, Orlandi

73,75,77Cu,81Ga,79Zn,74,76,78,80Zn,86,88Se,84Ge (d,p),(t,), Coulex

Tit2 targetEXOGAM/AGATADIAMAN/SPIDER

Neutron shell evolution in weakly bound 134,135Sn via (d,p) reactions

Lapoux, Sorlin 132-134Sn(d,p) CD2, ACTARCHyMENE

Probing the pairing interactionthrough two-neutron transfer

Beaumel 132Sn (p,t) 13 MeV/u CHyMENE

Study of pair transfer in 134Sn via 132Sn(t,p)

Sorlin, Wimmer 132Sn(t,p) Tit2 target

2p capture on 15O and proton correlation in 2p emission from excited 17Ne

Assié, de Oliveira

15O(3He,n) 10 MeV/uNEDA 2 GASPARD

Transfer to bound and unbound states and its influence on reaction dynamic

Shrivastava, Chatterjee

14OElastic, Transfer, Breakup, Fusion

EXOGAM/AGATAPb targetNo spectrometer

Exploration of cluster breakup in light nuclei

Scarpaci, Assié 14,15,16O, 20 MeV/uBreakup

PARIS

Gamma transition probability in unbound nuclei

Stefan, de Oliveira

14O(p,) 5.3, 5.6 MeV/u PARIS ?

Microscopic structure of Pydmy Dipole Resonance

Beaumel, Maj 131Sn(d,p)(d,t) 10 MeV/u

PARIS

GAmma SPectroscopy and PArticle Detectiondesign

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)

Integration of special targets (cryogenic,…)

ELECTRONICS:~ 15000 channels (Digital)Preamps to be in vacuum

Option: Annular detectors

Trapezoidal shapes for endcaps

Beam

“GASPHYDE” design adopted as the working solution

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

Si detectors developments at BARC Mumbai

Working group meeting on

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

at BARC, Nov 21st, 2011

PULSE SHAPE ANALYSIS

1) The use of strips 2) Energy limits 3) Homogeneity of the silicon wafers4) Channeling effects5) Charge/current input 6) Sampling rate/resolution7) Detector thickness dependence8) 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

R&D for the Si array

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 / MeVDigitizers: TNT-2 cards - 100 MHz

Preliminary spectra

Imax : maximum of the current signal

E (

MeV

)E

(M

eV)

Imax (a.u.)

Imax (a.u.)

Imax (a.u.)

Imax (a.u.)J.Duenas, V. Parkar, Huelva U.

7Li (35MeV) + 12C reaction @IPN-ORSAY, 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

Test at Orsay & Padova

Experimental Setup for digital pulse shape analysis

nTD

E-E

Beam Time: October 14-15, 2012Beam: 7Li, 20, 30, 35 MeVTarget: 89Y, 197Au, 12CSignal processing: Digital as well as analog

500

500

E: 30 E: 300

nTD Si pad 2cm x 2cmprovided by OrsayRear side injectionCollimator: 6 mm

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 developedFPGA based High speed Data acquisition board

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: 156.25 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.

The card

Single channel, only charge signal recorded

8 channel card expected soon

Typical pulses

7Li + 89Y

500 ns pre-trigger (adjustable)

2.5 s recording interval (adjustable)

7Li + 197Au

Time (ns)

Time (ns)

Trapezoidal Filter

TT

G

T

Analysis using ROOT

Pulse Height

Cou

nts

= 100 keV

7Li + 197Au

Cou

nts

Rise time (ns)

= 1.4 ns

10% 90%

TR

Risetime

7Li + 197Au

Energy vs Rise time (7Li +197Au)

225V

Ris

e tim

e (n

s)

Energy

Energy vs Rise time (7Li +12C)

225V

Ris

e tim

e (n

s)

Energy

Energy vs Rise time: (7Li +89Y)

7Li

6Li

Z=1

Ris

e t i

me

Energy

225V

Energy vs rise time: effect of depletion voltage

Energy

Ris

e tim

e

300V 250V

225V 200V

Energy vs Rise time and DE-E (mass separation)

7Li

6Li

Z=1

Ris

e tim

e

Energy

Z=1

6Li

7Li

E

E

225V

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 DSSD1st prototype 64x 64 strip DSSD has been received

Test DSSD with source and beam

Thank you

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)

GAmma SPectroscopy and PArticle DetectionCollaboration

J.Duenas, V.Parkar, R. Berjillos, Univ of Huelva M.Assie, D.Beaumel, B.Genolini, T.Faul, V. Le Ven, IPNOD. Mengoni, INFN PadovaGASPARD-HYDE-TRACE

May 2011

DETECTORS1) 70 m SSD, 5x5 cm22) 500 m nTD, 2x2 cm2 (one reverse mounted) from FAZIA (canberra)3) 300 m PAD detectors TRACE prototype (FBK Trento)

MEASURED:• Elastic scattering on Au H @ 1.5, 2, 4, 10 MeV D @ 1.5, 2, 2.5, 10 MeV 7Li @ 12, 18, 34 MeV• Reaction : 7Li + 12C at 34 MeV

(9 UT of beam in total)

beam

Preamplifiers:PACI (IPNO) BW ~ 400 MHzPARC-05 (IPNO) BW ~ 600 MHz

PSA test experiment at Orsay tandem

Next step: test with new detectors from MICRON SC

Delivered Oct 2011 Made of nTD wafers from TOPSIL Small pitch (500 m) High density connectors Special packaging with narrow frames

3-stages telescopes being prepared :

PACI preamplifiers (IPNO) GANIL DAQ with ~ 20 digital channels (MATACQ boards) Monoenergetic beams + reaction

Forthcoming test experiment at IPNO tandem (Feb 2012)

Worplan for 2012

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

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

ORSAY/HUELVA MUMBAI

PSA test experiment at GANIL with DSSD(FAZIA & GASPARD/HYDE collab.)

Rise time vs Energy

From A. Chbihi

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

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 / MeVDigitizers: TNT-2 cards - 100 MHz

Preliminary spectra

Imax : maximum of the current signal

J.Duenas, V. Parkar, Huelva U.

Detectors from MICRON SCnTD wafers from TOPSIL

nTD

Forthcoming test experiment at IPNO tandem