D. Suzuki Institut de Physique Nucléaire d’Orsay

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Presentation transcript:

ACTAR TPC: a new time projection chamber for radioactive beam experiments D. Suzuki Institut de Physique Nucléaire d’Orsay On behalf of the ACTAR TPC collaboration suzuki@ipno.in2p3.fr 10th RD51 Collaboration Meeting: October 4, 2012 Stony Brook, NY, USA

Outline Physics motivation Basic concept: “Active-target” TPC ACTAR TPC project scope Micromegas prototype test ACTAR TPC demonstrator

Physics motivation Z N Structure/ reaction dynamics of unstable nuclei Isospin dependence of nuclear mean field Weakly-bound many-body systems Nucleosynthesis N

Challenges of RI beam reactions Light ion (p, d, 3,4He…) as hadronic probe RI beams (heavy) + target (light) “Asymmetric” collision Swiftly moving CM frame Low-energy probe ion in LAB frame Energy loss in target deteriorates the resolution Idea of “Active-target” TPC Track ions “inside” the target 56Ni(d, d’)56Ni 56Ni d 56Ni CD2 solid target D2 gas target 56Ni d 56Ni http://pro.ganil-spiral2.eu/spiral2/instrumentation/actar-tpc

MAYA @GANIL Operational since 2003 Low beam energy (~ 3 MeV/u) Low transferred energy C.E. Demonchy et al., Nucl. Instrum. and Meth. A 583 (2007) 341 56Ni(d, d’) @50 MeV/u TRIUMF ISOLDE C. Monrozeau et al., Phys. Rev. Lett. 100 (2008) 042501 http://pro.ganil-spiral2.eu/laboratory/detectors/maya

Beyond MAYA Precise particle identification of stopped particles Discriminating (p, d, t) or (3He, 4He, 6He) is difficult with MAYA Using energy deposit profile MAYA is using wire technology with hexagonal pads ~ 1 cm MPGD with smaller pixels 2 x 2 mm2 6He(α, α) Taken with Micromegas 2 mm-wide strips 6He α D. Suzuki et al., Nucl. Instr. and Meth. A 691 (2012) 39.

Next Generation: ACTAR TPC Specifications Microgegas/ GEM (~ 650 cm2, pad size 2 × 2 mm2) 16,384 channel GET (General Electronics for TPC’s): Wave-digitizer using 511 analogue memory cells @ 100 MHz max Internal trigger/ zero suppression for reducing data traffic ANR Funded Project (Nov. 2009 − Oct. 2013) IRFU/CEA-Saclay, CENBG, GANIL, MSU Different physical geometries: Reaction and decay 2012 - 2013 Research and Development Tests of prototype detector (Micromegas & GEM) Building of demonstrator Physics simulations (ACTARsim) Chamber design (geometry, mechanics) GET electronics development Reactions MMs or GEMs 25.6 cm 25.6 cm Decay MMs + GEMs 12.8 cm 51.2 cm

Micromegas Prototype 5.6 cm ϕ5.6 cm, 2 × 2 mm2 576 channel prototypes Design @ IPN Orsay Bulk micromegas @ CEA Saclay (IRFU-SEDI) Amplification gaps (128 and 256 μm) 5.6 cm 72-channel connector

Detector tests inside Maya @ GANIL Determine angular and energy resolution Gases: C4H10, He:CF4 98:2, Ar:CF4 98:2 Pressures: 25 – 1100 mbar 239Pu/ 241Am/ 244Cm source T2K electronics (511 analogue circular memory cells) T. Lux for the T2K TPC groups, J. Phys: Conf. Ser. 65 (2007) 012018 Enclosure Field cage He:CF4 98:2 500 mbar Micromegas 256 μm T2K electronics Silicon

Horizontal Angular Resolution Slit position reconstruction: He:CF4 98:2 Extrapolation of 4 cm traces on pad plane Varied pressure, drift and amplification voltages Angular resolution < 1.3° (FWHM) Slit 5 α 12.5 mm (4.1°) Slit 9 1.1° FWHM Slit 13

Horizontal Angular Resolution How does resolution evolve with short traces? Important for low-energy reaction and decay products MAYA reconstruction not possible below ~ 5 cm 3.6 cm 2.4 cm 1.2 cm MAYA

Vertical Angular Resolution Vertical angles determined from the calibrated drift times Less sensitive to trace length (gas and pressure dependent) Angular resolution < 1.2° (FWHM) Equivalent to the horizontal resolution 12.5 mm (4.1°) 1.0° FWHM

Energy (Range) Resolution Range of α’s in Ar:CF4 98:2 @ 1100 mbar Range resolution > 0.8 mm (FWHM) Energy resolution > 80 keV (FWHM) 241Am 5.49 MeV 244Cm 5.81 MeV 1.2 mm FWHM 239Pu 5.16 MeV

ACTAR TPC Demonstrator Field Cage GANIL Pad Plane 1 IPNO Pad Plane 2 CENBG Electronics Si Strip Detector Moveable Source Beam Entrance 12 × 6 cm2; 2 × 2 mm2 × 2,048 pads Test high-density connection High-density connector (IPNO) Direct insertion to Micromegas Test GET electronics Assembled on Sep. 24, 2012 30 cm 24 cm 24 cm Enclosure IPNO

Summary ACTAR-TPC, a new time projection chamber for radioactive beam experiments, is under development in France. A high-granularity Micromegas was tested with C4H10, He:CF4, and Ar:CF4 Angular resolution ~ 1° FWHM Energy resolution ~ 80 keV FWHM Met or exceeded collaboration requirements ACTAR TPC Demonstrator has been assembled Test starts from October 2012 Test a complete GET system Define the final detector design Budget request for the full detector: Fall 2012 http://pro.ganil-spiral2.eu/spiral2/instrumentation/actar-tpc

ACTAR TPC Collaboration CENBG B.Blank, J.Giovinazzo, J.L.Pedroza, J.Pibernat GANIL S.Damoy, G.F.Grinyer, J.Pancin, D.Perez-Loureiro, F.Saillant, B.Raine, T.Roger, G.Wittwer IPNO V.Chambert, E.Khan, A.Lermitage, G.Noël, J.Peyre, J.Pouthas, P.Rosier, D.Suzuki, M.Vandebrouck, L.Vatrinet, T.Zerguerras IRFU Saclay F.Druillole, A.Gillibert, E.C.Pollacco K.U. Leuven R.Raabe, S.Sambi U de Santiago de Compostela H.Alvarez-Pol, J.Benlliure, M.Caamaño, D.Cortina-Gil, B.Fernandez-Dominguez Funding partners: