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Switched capacitor arrays (SCA) ASICs are becoming more and more popular for the readout of detector signals, since the sampling frequency of typically several gigasamples per second allows excellent pile-up rejection and time measurements. They suffer however from the fact that their sampling bins are not equidistant in time, given by limitations of the chip process. In the past, this limited time measurements of optimal signals to standard deviations ({sigma}) of about 4-25 ps in accuracy for the split pulse test, depending on the specific chip. This paper introduces a novel time calibration, which determines the true sampling speed of an SCA. Additionally, for two independently running SCA chips, the achieved time resolution improved to less than 3 ps ({sigma}) independently from the delay for the split pulse test, when simply applying a linear interpolation. When using a more advanced analyzing technique for the split pulse test with a single SCA, this limit is pushed below 1 ps ({sigma}) for delays up to 8 ns. Various test measurements with different boards based on the DRS4 ASIC indicate that the new calibration is stable over time but not over larger temperature variations.
A laser calibration system was developed for monitoring and calibrating time of flight (TOF) scintillating detector arrays. The system includes setups for both small- and large-scale scintillator arrays. Following test-bench characterization, the las
For the High-Luminosity phase of LHC, the ATLAS experiment is proposing the addition of a High Granularity Timing Detector (HGTD) in the forward region to mitigate the effects of the increased pile-up. The chosen detection technology is Low Gain Aval
The most common method to measure direct current high voltage (HV) down to the ppm-level is to use resistive high-voltage dividers. Such devices scale the HV into a range where it can be compared with precision digital voltmeters to reference voltage
Silicon pad sensors with novel functions of higher timing resolution (LGAD: Low Gain Avalanche Detector) and higher position resolution (PSD: Position Sensitive Detector) are studied for an application to Silicon-Tungsten electromagnetic calorimeter
A method is described that allows calibration and assessment of the linearity of response of an array of photomultiplier tubes. The method does not require knowledge of the photomultiplier single photoelectron response model and uses science data dir