Charged-particle coincidence correlated measurements such as angular correlations between rare and main fission fragments measured with conventional detectors provide only partial and limited information (energy cutoff, narrow range of studied ion Z numbers). Many of these drawbacks arise from the standard solid state detectors used so far which can be solved simultaneously by usage of highly segmented single-quantum counting pixel detectors. The Timepix pixel device, which is equipped with energy and time sensitivity capability per pixel, provides high granularity, wide dynamic range and per pixel threshold. This detector operated with integrated USB-readout interfaces such as the USB 1.0 and FITPix devices and the data acquisition software tool Pixelman, both developed for the pixel detectors of the Medipix-family, enables a variety of instrumental configurations, visualization, real-time event-by-event selection as well as vacuum and portability of operation for flexible measurements on different targets and setups. These features combined with event track analysis provide enhanced signal to noise ratio with a high suppression of background and unwanted events. The detector provides multi-parameter information (position, energy and time) for basically all types of ionizing particles in a wide dynamic range of energy (pixel energy threshold ≈ 4 keV), interaction/arrival time (timepix clock step ≥ 100 ns) and position (pixel size = 55 μm). High selectivity is achieved by spatial and time correlation in the same sensor. In addition, several detectors can be run in coincidence. The open and close exposition (shutter) time as well as the readout DAQ can be fully synchronized. For this purpose, we have assembled a modular multi-parameter, tunable and extendable coincidence detector array system based on two and more Timepix devices which can be coupled with supplementary detectors (solid state ΔE detectors and/or ionization chambers) for enhanced ion selectivity. We describe the individual configurations and techniques together with the experiments carried out at several neutron beam/source facilities. We summarize the results and capabilities of application.

Spatially correlated and coincidence detection of fission fragments with the pixel detector Timepix

To allow measurement of the equilibrium density fluctuations on a nanometer-length scale using small angle X-ray scattering, an asynchronous event-driven-address time-stamped (EDATS) pixelated array detector, operational over correlation time spans ranging from less than 10-6 to greater than 104 seconds, was designed, fabricated, and tested Its performance was validated for use in X-ray photon correlation spectroscopy (XPCS) experiments The EDATS pixelated detector arrays each include a custom readout integrated circuit (ROIC), the Voxtel model VX-807, hybridized to a silicon photodiode array optimized for 500 eV to 2000 eV X-ray photons The 492 × 492-element array is composed of each 40-micrometer × 40-micrometer pixel unit cell The unit cell circuits of the VX-807 ROIC include a low-noise capacitive transimpedence amplifier (CTIA) followed by a C-RC shaping amplifier These analog front-end (AFE) circuits are used to convert the absorbed X-ray photon signal to a voltage pulse, which may trigger a user-programmable threshold comparator The detected X-ray photon events are broadcast to token-based address arbitration circuits, at the periphery of the X-ray sensitive pixel array, which recover the address of the photon event and communicate the address to a time-to-digital converter (TDC), where the address is time stamped, with a maximum temporal jitter of 85 nanoseconds Separate digital arbitration blocks are used in each of the four quadrants of the ROIC, allowing an overall count rate of 100 MHz to be achieved The VX-807 ROICs were hybridized to pin photodiode arrays fabricated on six-inch silicon-on-insulator (SOI) wafers, with a fully depleted 20-micrometer-thick X-ray-sensitive silicon layer The hybridized EDATS sensor chip assemblies (SCAs) were then tested and their performance was verified

Pixelated detector with photon address event driven time stamping and correlation

The paper describes a compact system for detecting Single Event Effects (SEE) in semiconductor components. The SEE is caused by a hit into a electronic chip with an energetic particle. The hit can cause unexpected behaviour of the system. The tested component is called Device Under Test (DUT). The structure of the system is shown and used components are described with their main tasks. Some of results of the running system are shown.

Compact device for detecting single event effects in semiconductor components

An article describes design of the advanced interface primarily dedicated for the silicon pixelated particle detector of the Medipix family. The interface allows to gain information from the pixelated matrix and also to gain spectroscopy information from the common electrode of the pixelated detector. There is also described an implemented functionality enabling applications of the device in the coincidence measurement.

The interface for the pixelated particle detector with the capability of the spectroscopy function and the coincidence measurement operation

The Article deals with the precise timed measurement using the advanced pixelated particle detector. There is described a design of the extra device Spectrig that is dedicated to generate the additional trigger signal which enables utilization of detector capabilities in the single particle tracking and spectroscopy applications. The article also describes how the Spectrig device performs signal processing and how it is implemented.

SPECTRIG — Device for triggering and spectroscopy with the pixelated particle detector

The quantum counting position sensitive pixel detector Timepix with per‐pixel energy and time resolution enables to detect radioactive ions and register the consecutive decay chain by simultaneous position–and time—correlation. This spatial and timing coincidence technique in the same sensor is demonstrated by the registration of the decay chain 8He→β 8Li and 8Li→β− 8Be→α+α and by the measurement of the β decay half‐lives. Radioactive ions, selectively obtained from the Lohengrin fission fragment spectrometer installed at the High Flux Reactor of the ILL Grenoble, are delivered to the Timepix silicon sensor where decays of the implanted ions and daughter nuclei are registered and visualized. We measure decay lifetimes in the range ≥ μs with precision limited just by counting statistics.

Spatial and Time Coincidence Detection of the Decay Chain of Short-Lived Radioactive Nuclei

Study of Neutron Induced Reactions on 7Be Using Large Angle Coincidence Spectroscopy

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Papers

Spatially correlated and coincidence detection of fission fragments with the pixel detector Timepix

Spatial and Time Coincidence Detection of the Decay Chain of Short-Lived Radioactive Nuclei

Study of Neutron Induced Reactions on 7Be Using Large Angle Coincidence Spectroscopy