ASTROGAM Calorimeter: detector and FEE
Transcript
ASTROGAM Calorimeter: detector and FEE
ASTROGAM Calorimeter: detector and FEE Martino Marisaldi – INAF IASF Bologna 1st ASTROGAM Workshop, Roma 09-10 Dec. 2013 Compton telescopes 2 interaction positions + time-of-flight COMPTEL Redundant photon interaction position (removes direction ambiguity) NCT, LXeGRIT, Most ACT concepts Electron tracking MEGA, TIGRE, GRIPS ASTROGAM Credits: Andreas Zoglauer PhD Thesis 09/12/14 M. Marisaldi - ASTROGAM WS Rome 2 Compton kinematics 1 What we need: Must measure with the highest precision direction and energy of the recoil electron and scattered g What we want: Credits: Andreas Zoglauer PhD Thesis 09/12/14 M. Marisaldi - ASTROGAM WS Rome 3 Compton kinematics 2 If I don’t know anything of the recoil electron direction: Credits: Andreas Zoglauer PhD Thesis 09/12/14 M. Marisaldi - ASTROGAM WS Rome 4 Angular resolution 2 MeV g Recoil electron only 09/12/14 Scattered gamma-ray only Credits: Andreas Zoglauer PhD Thesis Angular resolution depends on the accuracy of energy measurement for e- and g 5 Angular resolution requirements pose constraints on energy resolution M. Marisaldi - ASTROGAM WS Rome The ingredients: • • • • high-Z absorber (CsI(Tl), LaBr3…) Low-noise photodetector Low-noise front-end electronics Few mm position resolution: tradeoff pixel size vs. power consumption / complexity. 09/12/14 M. Marisaldi - ASTROGAM WS Rome 6 Need for low-noise photodetector and low-noise front-end electronics ~300 e- rms a 1/E a 1/E1/2 ~30 e- rms Fiorini et al. TNS (2006) 09/12/14 M. Marisaldi - ASTROGAM WS Rome 7 Silicon Drift Detector – Basic Principle M. Marisaldi - ASTROGAM WS Rome 8 SDD development and applications in Italy: the INFN XDXL and ReDSoX R&D projects Technology Science 06/11/2013 M. Marisaldi - ASTROMEV @APC Paris 9 Post-ALICE SDD development @ INFN & FBK ALICE (2002) INFN & Canberra ALI2 (2010-11) INFN & FBK XDXL-1 (2011-12) INFN & FBK XDXL-2 (end-2012) Proof of Concept Shift to FBK low-E improvement, low-power, humidty, .. INFN Large pitch Trieste Design 145 mm & 970 mm pitch INFN & FBK R. Campana et al. Imaging performance of a large-area Silicon- ASTROGAM Drift Detector for X-ray astronomy NIM-A 633 (2011) 22 M. Marisaldi WS Rome 10 Very Low Noise front-end electronics VEGA ASIC (design by Politecnico Mi & Uni PV, production by AMS 0.35mm MPW): Low-noise low-power mixed signal ASIC for SDD readout Optimized for high resolution X-ray spectroscopy < 15 e- RMS For each channel: •pre-amplifier: <15 e- RMS •shaping amplifier •discriminator •peak and hold •channel tuning (thr, on/off, etc) • power consumption: 418 mW/ch M. Ahangarianabhari et al., IWORID 2013, to be submitted to Journal of Instrumentations M. Marisaldi - ASTROMEV @APC Paris 11 Silicon Drift Detectors coupled to CsI(Tl) scintillators SDD array (MEGA chip) by PNSensor gmbh (ASI – funded R&D, <2009) SDD single elements and array by INFN / FBK (INFN / INAF funded R&D) 12000 X-ray spectrum 55 Fe 10000 06/11/2013 counts C. Labanti et al., SPIE Proc. 2008 F. Perotti et al., SPIE Proc. 2008 8000 6000 FWHM = 260 eV 4000 2000 FWHM = 270 eV 0 4 5 6 7 8 Energy (keV) 800 g-ray spectrum 137 Cs counts 600 400 FWHM = 6.2% 200 0 0 M. Marisaldi - ASTROMEV @APC Paris 100 200 300 400 Energy (keV) 500 600 700 12 800 Architectures for space g-ray calorimeters INTEGRAL IBIS/PICsIT @INAF IASFBO AGILE MCAL @INAF IASFBO 09/12/14 M. Marisaldi - ASTROGAM WS Rome 13 Hodoscopic architecture Light attenuation 1200 1000 ch (AU) 800 600 PD 400 200 0 -7.5 PD A x= -6 -4.5 -3 -1.5 0 cm æu ö ln çç (0,A) ÷÷ - Da L è u(0,B) ø _ 2a + 1.5 3 4.5 6 7.5 æ U B - OB ö ln ç ÷ _ U O è A Aø 2a 1 PD B _ a E= AGILE MCAL heritage 09/12/14 M. Marisaldi - ASTROGAM WS Rome e L 2 u(0,A) × u(0,B) eDa x (U A - OA )(U B - OB ) 14 Position resolution AGILE-MCAL: 39 cm Csi(Tl) bar + PIN PD 14 mm @1.3MeV – 7 mm @ ~10 MeV Labanti et al., NIM A (2009) 120 100 9 cm Csi(Tl) bar + single SDD 3.5 mm @ 0.662 MeV a. u. 80 Labanti et al., IEEE NSS Conf. Rec. (2008) 60 40 20 0 09/12/14 -80 -40 M. Marisaldi - ASTROGAM WS Rome 0 mm 40 80 15 A modular approach SDD 2x2 array Credits: F. Fuschino - UniBo Wrappaed CsI(Tl) bars 09/12/14 M. Marisaldi - ASTROGAM WS Rome 16 A modular approach Wrappaed CsI(Tl) bars Credits: F. Fuschino - UniBo 09/12/14 To back-end electronics By flex cables M. Marisaldi - ASTROGAM WS Rome 17 Summary • Bottom CAL for ASTROGAM: 2D matrix of CsI(Tl) bars with double-side SDD readout • SDD by INFN + FBK + INAF IASF Bo & IAPS Roma • Possible contribution to FEE by Poli.Mi and Uni. Pv. IDEFiX by CEA can work as well. Both need minor R&D. • Not so many degrees of freedom (to be fixed by simulations / constraints): – Size? Si tracker size: 50 - 60 cm – Thickness? 5 cm: 81 kg CsI, 4 cm: 65 kg – Pixel size? Baseline 5mm 2x14400 ch for 60cm side. <0.5mW/ch 15W FEE + buffer power 09/12/14 M. Marisaldi - ASTROGAM WS Rome 18