ACTARSim: a simulation code for ACtive TARgets H. Alvarez-Pol GENP, Univ. de Santiago de Compostela on behalf of the ACTAR-TPC collaboration ICC/SPIRAL2 Meeting on Common Simulation & Data Analysis Framework, Orsay, 26th November 2014
Context ACTARSim: a simulation code for ACTAR TPC Topics covered: ● Active Targets. ● The ACTAR TPC program. ● ActarSim code in detail. ● Tests and status. ● Ongoing development. Work supported by Xunta de Galicia “Proxectos Plan Galego IDT”, project 2013-PG015: “Física de núcleos exóticos con Detectores Activos” for the study of 20 Mg(p,p) and 20 Mg(p,p') resonant reactions for the spectroscopy of 21 Al, exotic nuclei in the rp-process by transfer ( 57 Cu, 61 Ga, 73 Rb, 77 Y), and fission after transfer reactions. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 2
ACtive TARget introduction The concept behind ACtive TARgets In short: the detection gas is the target itself. • High geometric efficiency. • High thickness. High luminosity. • Control on the reaction energy. Very low threshold. • Full 3D tracking of participant particles. • In many cases, close to zero background. Ideal for low statistics reactions and short-lived species. Physics cases particularly suited: • Resonant reactions. • One- and multi-nucleon transfer on light nuclei reactions or fission. • Inelastic scattering to GRs (GMR, GQR, ...). • Nuclear astrophysics. • Search for exotic decays, delayed modes, ... ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 3
ACtive TARget precursors in nuclear physics ACtive TARget precursors CENBG TPC (2005): • For two-proton radioactivity. • Energies and angles between protons. • GEM's + 200 μm pitch μ-grooves. TACTIC (2007): • Astrophysical interest reactions. • Ready for high intensities (10 7 ions/s). B.Blank et al. Nucl. Instrum. Meth. Phys. Res. A 613, 65 (2010) • Target gas isolated and interaction vertex ionization not reachable. K.A.Chipps et al. Proceedings of Science (NIC XI) 261 (2010) ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 4
ACtive TARget precursors in nuclear physics MAYA Active Target MAYA main characteristics: • Box-like geometry with ancillary detectors (Si and CsI[Tl]) in the front wall. • 1024 hexagonal pads with Frisch grid and proportional wire amplification. • Versatile multipurpose design. C.E.Demonchy et al. Nucl. Instrum. Meth. Phys. Res. A 583, 341 (2007) ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 5
ACtive TARget precursors in nuclear physics MAYA Active Target: Physics highlights: • Structure for unbound isotopes: analysis of 7 H (most exotic nuclei ever). M.Caamano et al. Phys. Rev. Lett. 99, 062502 (2007) ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 6
ACtive TARget precursors in nuclear physics MAYA Active Target: Physics highlights: • Structure for unbound isotopes: analysis of 7 H (most exotic nuclei ever). • First study of 11 Li 2-neutron halo via transfer reactions at low energy. I.Tanihata et al. Phys. Rev. Lett. 100, 192502 (2008) T.Roger et al. Phys. Rev. C. 79, 031603 (2009) ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 7
ACtive TARget precursors in nuclear physics MAYA Active Target: Physics highlights: • Structure for unbound isotopes: analysis of 7 H (most exotic nuclei ever). • First study of 11 Li 2-neutron halo via transfer reactions at low energy. • Giant Resonances analysis for Ni isotopes ( 56 Ni(α,α’), 68 Ni(α, α’), 68 Ni(d,d’)). C.Monrozeau et al. Phys. Rev. Lett. 100, 042501 (2008) M. Vandebrouck et al., Accepted in Phys. Rev. Lett (2014) • ... • Future measurements: transfer induced fission (starting next week). ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 8
The ACTAR TPC project The ACTAR-TPC detector Leading a new generation of Active target devices: • Overcomes many of the limitations with present devices. • Funded via an ERC Starting grant (2014-2019). Physics cases: • One and two nucleon transfer reactions. • Rare and exotic nuclear decay (2p, β-2p, …). • Transfer-induced fission. • Inelastic scattering and giant resonances. • Resonant scattering and astrophysics. Detector Design: • Amplification = MICROMEGAS (+ GEMs). • Pad sizes of 2x2 mm 2 : 16384 channels. • ANR General Electronics for TPC’s (GET). • Improved data throughput + internal trigger. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 9
ACTARSim: simulation code for ACTAR- TPC ACTARSim (since 2005) ActarSim is a Geant4 + ROOT application for ACtive TARgets simulation. • Developed for the ACTAR TPC design and MAYA analysis comparison. • Initial development at USC, maintained and extended in GANIL since 2008. • New developments ongoing during ACTAR-TPC construction period, responsabilities back to USC (2013). GEANT4 is used for the production and tracking of primaries and secondaries above E cut = 1 keV. ROOT is used for the calculation of the drift and diffusion of the electronic clouds, the induction in the pad plane, the visualization, ... ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 10
ACTARSim in detail ACTARsim main characteristics: Detectors geometry: • Cube (MAYA or ACTAR-TPC). • Cylinder (drift on endcaps or sides). • Easy size modification for design. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 11
ACTARSim in detail ACTARsim main characteristics: Detectors geometry: • Cube (MAYA or ACTAR-TPC). • Cylinder (drift on endcaps or sides). • Easy size modification for design. Gas and pressure: • Several gas predefined. • Presure, density, … given at runtime. Required for the Geant4 initialization. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 12
ACTARSim in detail ACTARsim main characteristics: Detectors geometry: • Cube (MAYA or ACTAR-TPC). • Cylinder (drift on endcaps or sides). • Easy size modification for design. Gas and pressure: • Several gas predefined. • Presure, density, … given at runtime. Required for the Geant4 initialization. Ancillary detectors: • Configurable silicon DSSD layers. • Configurable CsI[Tl] detectors. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 13
ACTARSim in detail ACTARsim Geant4 part: Kinematics calculator integrated: • Event generator with proper vertex calculation based on kinematics. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 14
ACTARSim in detail ACTARsim Geant4 part: Kinematics calculator integrated: • Event generator with proper vertex calculation based on kinematics. Physics interaction from Geant4: • Realistic description of discrete and continuum processes. • User selectable physics packages. • Realistic beam-gas interaction with gaussian beam profile. • Beam shielding tube possible. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 15
ACTARSim in detail ACTARsim Geant4 part: Kinematics calculator integrated: • Event generator with proper vertex calculation based on kinematics. Physics interaction from Geant4: • Realistic description of discrete and continuum processes. • User selectable physics packages. • Realistic beam-gas interaction with gaussian beam profile. • Beam shielding tube possible. That's all for the Geant4 part! ● The result is a TTree (TClonesArray) of strides (groups of steps) per particle. ● Energy loss used for the calculation of the ionization in the gas. ● The TTree contains the Hits in the ancillary detectors. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 16
ACTARSim in detail ACTARsim ROOT part: Drift in electric and magnetic fields: • Constant electric field included. • Drift parameters selected by the user. • Drift and difussion is calculated using the electric maps. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 17
ACTARSim in detail ACTARsim ROOT part: Drift in electric and magnetic fields: • Constant electric field included. • Drift parameters selected by the user. • Drift and difussion is calculated using the electric maps. Amplification and pad induction: • GEM, micromegas and wires amplification schemes are included, as well as the induction in the pad plane. • Variable size, hexagonal- or square- shaped pad planes included. ACTARSim: a simulation for ACTAR TPC - H. Alvarez Pol Orsay, 26th November 2014 18
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