The superconducting microcalorimeters array for the X IFU instrument on board of Athena Luciano Gottardi
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1 The superconducting microcalorimeters array for the X IFU instrument on board of Athena Luciano Gottardi 13th Pisa meeting on advanced detectors Isola d'elba, Italy, May 24 30, 2015
2 Advance Telescope for High ENergy Astrophysics Selected by ESA as the next large mission (L2) to study The Hot and Energetic Universe How do black holes grow and influence the Universe? How does ordinary matter assemble into the large scale structures we see today? Nandra et al. 2013, 2014
3 The Athena X ray Observatory launch ~2028 Willingale et al, 2013 arxiv L2 orbit Ariane V Mass < 5100 kg Power 2500 W 5 year mission Silicon Pore Optics: 2 m2 at 1 kev 5 arcsec HEW Focal length: 12 m Sensitivity: erg cm 2 s 1 X ray Integral Field Unit: de: 2.5 ev Field of View: 5 arcmin Operating temp: 50 mk Barret et al., 2013 arxiv: L.Ravera et al. SPIE 2014 Wide Field Imager: de: 125 ev Field of View: 40 arcmin High countrate capability Rau et al arxiv
4 Science with the X ray Integral Field Unit spatially resolved high resolution X ray spectroscopy the X IFU must provide breakthrough capabilities for: Mapping in 3D the hot cosmic gas to measure motions and turbulence: e.g. to study the process of matter assembly in clusters, the AGN feedback on galaxy and cluster scales, Detecting weak lines to characterize metals in clusters, the missing baryons in the Warm Hot Intergalactic Medium, L. Ravera et al., SPIE
5 The X IFU instrument on ATHENA spatially resolved high resolution X ray spectroscopy Energy range: keV Energy resolution: 2.5eV (E<7keV) Field of view: 5 arcmin Pixel size: < 5x5 arcsec2 Non X ray backgrnd: < 5x10 3 cts/cm2/kev These requirements can be met by R. den Hartog et al., SPIE (2014) a large array of 3840 Transition Edge Sensors with absorbers of 250 μm x 250 μm actively shielded Multiplexing factor: ~40 pixels/channel SQUID based Frequency Domain Multiplexing TES based anti coincidence detector Bath temperature: 50mK 5
6 Superconducting Transition Edge Sensors Electrical circuit Thin film superconducting bilayer: Ti/Au Mo/Au Mo/Cu Thermal circuit Electro thermal feedback Heat input from photons: TES temperature and resistance up Joule power down fast recovery self biasing in the transition K. D. Irwin, Appl. Phys. Lett. 66, 1945 (1995) 6
7 TES micro calorimeters Single photon detector C G Energy resolution: Low temperature detector Tc~100mK Sharp transition ~ Small pixels, low C absorbers Limited dynamic range: Elin C/ 7
8 TES micro calorimeters SiN membrane Nb leads TES 150 μm Bismuth absorber 4um Au absorber Thin film absorber: Au, Bi,... TES 8
9 TES physics on recently understood R(T,I,B) Nb JJ=Jo sin ϕ LJ=LJ o cos 1 ϕ TiAu Nb TES resistance in transition depends on T, I, and B TES behaves as a weak link (Josephson junction) due to proximity effect induced by the superconducting Nb leads
10 Superconducting weak link effects in TESs Weak link effects observed at NASA GSFC with TES microcalorimeters under dc bias TES bolometers at SRON under ac bias: Direct measurement of the Josephson current and of the TES non linear inductance J.Sadleir et al. PRL 104, (2010) S.Smith et al. JAP,114, (2013) 2.4MHz Josephson current L. Gottardi et al. APL, 105, (2014) Modelling of the resistive transition in a TES using Josephson junction theory
11 TESs are very sensitive detectors FWHM=1.81 6keV defwhm=0.03% 1.3x10 19 W/Hz½ Due to publication right issues this picture has been removed intentionally. Please contact the author for more info. courtesy S.Bandler NASA GSFC Due to publication right issues this picture has been removed intentionally. Please contact the author for more info. T.Suzuki SRON 2015 Current state of the art of TES microcalorimeters Current state of the art of TES bolometers NASA Goddard SRON (SAFARI)
12 TES bolometers array developed at SRON for infrared missions SiN Legs: 200nm thick 200nm wide 1mm long TES: Ti/Au bilayer 15/50nm M.Ridder nm
13 Best performing X ray microcalorimeters at SRON 500cnts/sec TES: TiAu thickness: 20/55 nm size: μm2 absorber: Cu/Bi thickness: 1/2.64 μm size: μm2 Measurement done under DC bias. Stopping power 74%, low filling factor Energy scan performed at the Synchrotron Radiation facility BESSY (Berlin) 13
14 Best performing X ray microcalorimeters at SRON 250eV 500c/sec TES: TiAu thickness: 20/55 nm size: μm2 absorber: Cu/Bi thickness: 1/2.64 μm size: μm2 Measurement done under DC bias. Stopping power 74%, low filling factor Energy scan performed at the Synchrotron Radiation facility BESSY (Berlin) 14
15 SRON X ray TES microcalorimeters array 32x32 pixels array demonstrator (2006) Fully wired from the TESs, only a selection of pixels wired to the chip edge 15
16 Detectors array configuration for X IFU (Under study) Due to publication right issues this picture has been removed intentionally. Please contact the author for more info. QE=94% courtesy S.Bandler, 2015
17 Frequency Domain Multiplexing Multiplexing needed due to limited cooling power and to reduce harness complexity khz MHz Modulation: shift in frequency space by multiplication with carrier TES works as Amplitude Modulator (AM) High Q factor superconducting LC resonators needed for voltage bias Baseband feedback to increase linear dynamic range frequency FDM feature One TES per row One LC filter per TES One SQUID amplifier per column Voltage bias comb per column 17
18 8+ pixels FDM demonstration ~5 cm Cryogen free DR Leiden Cryogenics FDM channels Pixels array from NASA Goddard 18
19 Current status FDM demonstration Almost quantum limited two stage SQUID amplifier 3.4eV L.Gottardi et al. ASC 2014 Very good SQUID performance with GSFC detectors 19
20 Current status FDM demonstration 2.3MHz 3.7MHz de~ 2.6±0.1 ev de~ 2.7±0.1 ev Due to publication right issues this picture has been removed intentionally. Please contact the author for more info. Due to publication right issues this picture has been removed intentionally. Please contact the author for more info. H. Akamatsu, 2015 Single pixel high energy resolution demonstrated in the representative frequency range Work on going to improve statistics and the multiplexing performance 20
21 Demonstration Model: 4x40 pixels FDM demonstration Summing point. Baseline FPA configuration: Apply same shield / suspension geometry in DM + EM, optimize 50 mk geometry for EM LC filter unit R.Hijmenring,A. van der Linden, M.Bruijn, 2014 GSFC array H.van Weers,
22 Anti coincidence detector courtesy C. Macculi INAF
23 Focal plane assembly H.van Weers,
24 Key technology under development at SRON High Q factor superconducting LC filters TES array Polyimide flex chips Nb 6µm PI Electroplated Au bumping 4.3 µω 10 µm Detector cold head M.Bruijn,
25
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