1 / 17

DSSD detectors development for a space Compton telescope

DSSD detectors development for a space Compton telescope. P. Laurent, Y. Dolgorouky, M. Khalil, W. Bertoli , R. Oger APC. High Energy Astrophysics in a few words …. Transient source. Host galaxy. SN 1994d. GRB 011121. Messier 87. 1E 1740.7-2942. Jacques Paul.

livi
Download Presentation

DSSD detectors development for a space Compton telescope

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. DSSD detectors development for a space Compton telescope P. Laurent, Y. Dolgorouky, M. Khalil, W. Bertoli, R. Oger APC INFIERI meeting – 15 juillet 2014

  2. High Energy Astrophysics in a few words … INFIERI meeting – 15 juillet 2014

  3. Transient source Host galaxy SN 1994d GRB 011121 Messier 87 1E 1740.7-2942 Jacques Paul Observables – The Violent Universe – International Winter School – 13 and 14 March 2007 Slide 3 High Energy astrophysical sites Sites where extreme physical conditions prevail: intense gravity fields, very high temperatures, strong magnetic and electric fields An apparently ill-assorted gallery of cosmic sites, but ... All sites give way to the fatal attraction of gravity Many sites produce copious outflows of relativistic matter Privileged messengers: gamma-ray photons, neutrinos, cosmic rays, gravitational waves INFIERI meeting – 15 juillet 2014 3

  4. 100 Atmospheric transmission reduced by 50% 80 Altitude (km) 60 40 20 radio IR V UV X gamma Jacques Paul Observables – The Violent Universe – International Winter School – 13 and 14 March 2007 Slide 4 The atmospheric screen INFIERI meeting – 15 juillet 2014 4

  5. 10 TeV 10 GeV 1 GeV 10 MeV 1 MeV 1 TeV 1 PeV 100 TeV 100 GeV 100 keV 100 MeV Jacques Paul Observables – The Violent Universe – International Winter School – 13 and 14 March 2007 Slide 5 High Energy telescopes Ground Space HESS FERMI INTEGRAL COMPTEL INFIERI meeting – 15 juillet 2014 5

  6. MeV range sensitivity gap • The MeV range suffers from a high sensitivity gap as this is the domain for: • Inelastic Compton scattering  minimal cross section of interaction. • Nuclear lines sky observations are polluted by a strong induced background. 1 GeV 100 MeV Energy 10 MeV 1 MeV 100 keV Sensitivity INFIERI meeting – 15 juillet 2014 6

  7. Telescopes in the MeV range: Compton telescope principles INFIERI meeting – 15 juillet 2014

  8. Compton telescope principles A basic Compton telescope features two Telescope axis Φ layer of position sensitive detectors Layer 1: made of diffusive material to scatter the incident gamma ray Ψ θ Layer 2: made of absorbing material to absorb the scattered photon Both incoming photon incidence angle Φ and energy E0 can be derived from the energy deposits E1 in layer 1 and E2 in layer 2 and from the angle Ψ of the scattered photon Jacques Paul Observables – The Violent Universe – International Winter School – 13 and 14 March 2007 Slide 8 INFIERI meeting – 15 juillet 2014 8

  9. Compton telescope principles Φ Ψ θ • Thus the direction of the incident photon is on a cone of semi-angle  and axis along the scattered photon direction. The intersection of this cone with the celestial sphere is a circle. Cones projection simulation done by gamma-ray astronomy group @ SSL (UC Berkeley) INFIERI meeting – 15 juillet 2014 9

  10. PACT Compton telescope short description INFIERI meeting – 15 juillet 2014

  11. GEANT 4 mass model of the PACT telescope 30 layers of 12 x 12 Si DSSDs = 4320 DSSDs 3 layers of 24 x 24 LaBr3 (CeBr3:Sr) detectors Each crystal is 5x5x2 cm3, coupled to a 3-mm thick SiPM (matrix 8x8) at the bottom Number of electronics channels: 92160 (DSSDs) + 110592 (CeBr3) = 202752 Plastic anticoincidence detector Overall instrument size: 136.6 x 136.6 x 49.3 cm3 INFIERI meeting – 15 juillet 2014 11

  12. Summary of PACT Performances INFIERI meeting – 15 juillet 2014 12

  13. On-going R&T programs;DSSD chain @ APC INFIERI meeting – 15 juillet 2014

  14. R&D DSSDs @ IPNO • BB7 detector (Micron Semiconductor): • 1.5 mm thickness • 32 + 32 channels • 64 x 64 mm2 • Pitch 2mm 241Am source Test bench with standard electronic Ongoing: charge sharing study, temperature study, ... Energy resolution @ 60 keV → 8 keV (FWHM) Energy threshold: ~ 11 keV • Ongoing: • FEE board design almost finished • New BB7 detector ordered • ASIC based solution: → VA32TA7 from IDEAS • DNR = +/- 72 fC (= 1.6 MeV) • ENC: 160 e- + 16 e-/pF → ~ 5 keV First tests with BB7 beginning of 2014 INFIERI meeting – 15 juillet 2014 14

  15. Calorimeter developments at CSNSM INFIERI meeting – 15 juillet 2014

  16. DSSD development at CEA and APC DSSD development funded by CNES and LabeX UnivEarth. First light with IdefX chain + MUSETT DSSD (from nuclear physics): fall 2014. Image with the optimized DSSD from the “MIcron SemiConductor” company : end of 2014. • We made in APC DSSD simulations with the Silvaco software in order to determine our detector parameters (see above). • This has led to the order of DSSD to the Micron company. They will be delivered in Fall 2014. • In parallel, we are mounting a test bench using a MUSETT DSSD with the IdefX chain, conceived at CEA (see right). INFIERI meeting – 15 juillet 2014

  17. Laboratory program • Initiation to High Energy Astrophysics; specificity of the MeV range. • Compton telescope principles. • Description of the PACT telescope and its performance. GEANT 4 simulations. • Silicon stack and DSSDs. • Presentation of the readout chain with the IdeFX ASIC. • Implementation and first light of the DSSD + readout chain. INFIERI meeting – 15 juillet 2014

More Related