15 research outputs found

    Particle Effects on the ISGRI Instrument On-Board the INTEGRAL Satellite

    Get PDF
    The INTEGRAL satellite was launched on October 17, 2002. All on-board instruments are operating successfully. In this paper, we focus on radiation effects on the Cadmium Telluride camera ISGRI. The spectral response of the camera is affected by cosmic particles depositing huge amount of energy, greater than the high threshold of the electronics. Our study raises the contribution of cosmic ray protons. Solutions are proposed to limit the degradation of spectral response of large pixel gamma cameras operating in space

    SCTA - A Rad-Hard BiCMOS Analogue Readout ASIC for the ATLAS Semiconductor Tracker

    Get PDF
    Two prototype chips for the analogue readout of silicon strip detectors in the ATLAS Semiconductor Tracker (SCT) have been designed and manufactured, in 32 channels and 128 channel versions, using the radiation hard BiCMOS DMILL process. The SCTA chip comprises three basic blocks: front-end amplifier, analogue pipeline and output multiplexer. The front-end circuit is a fast transresistance amplifier followed by an integrator, providing fast shaping with a peaking time of 25 ns, and an output buffer. The front end output values are sampled at 40 MHz rate and stored in a 112-cell deep analogue pipeline. The delay between the write pointer and trigger pointer is tunable between 2 ms and 2.5 ms. The chip has been tested successfully and subsequently irradiated up to 10 Mrad. Full functionality of all blocks of the chip has been achieved at a clock frequency of 40 MHz both before and after irradiation. Noise figures of ENC = 720 e- + 33 e-/pF before irradiation and 840 e- + 33 e-/pF after irradiation have been obtained

    ATLAS detector and physics performance: Technical Design Report, 1

    Get PDF

    IDeF-X HD: A CMOS ASIC for the Readout of Cd(Zn)Te Detectors for Space-Borne Applications

    No full text
    International audienceIDeF-X HD is a 32-channel analog front-end with self-triggering capability optimized for the readout of 16×16 pixels CdTe or CdZnTe pixelated detectors to build a low power micro-gamma camera. IDeF-X HD has been designed in the standard AMS CMOS 0.35μm process technology. Its power consumption is 800μW per channel. The energy range of the ASIC can be extended to 1.1MeV thanks to the in-channel adjustable gain stage. When no detector is connected to the chip and without input current, a 33 electrons rms ENC level is achieved after shaping with 10.7μs peaking time. Spectroscopy measurements have been performed with CdTe Schottky detectors. We measured an energy resolution of 4.2keV FWHM at 667keV (137Cs) on a single-pixel configuration. Meanwhile, we also measured 562eV and 666eV FWHM at 14keV and 60keV, respectively (241Am) with a 256 small pixel array and a low detection threshold of 1.2keV. Since IDeF-X HD is intended for space-borne applications in astrophysics, we evaluated its radiation tolerance and its sensitivity to single event effects. We demonstrated that the ASIC remained fully functional without significant degradation of its performances after 200 krad and that no single event latch-up was detected putting the linear energy transfer threshold above 110MeV/(mg/cm2). Good noise performance and radiation tolerance make the chip well suited for X-rays energy discrimination and high energy resolution. The chip is space qualified and flies on board of the solar orbiter ESA mission launched in 2020

    ATLAS computing technical proposal

    No full text

    ATLAS computing technical proposal

    No full text

    ATLAS calorimeter performance

    No full text
    corecore