[en] Results on particle identification obtained measuring the primary ionization in a drift chamber operating in a mixture He 80%-CH₄ 20% at normal conditions are presented. The data, collected at CERN (PS T9 beam), indicate that the cluster-counting technique allows a substantial improvement with respect to the more traditional measurements. π/K separation of ≅ 3.6σ at 4 GeV was obtained over the entire volume of the chamber: 144 (3 x 3) cm² cells with an average tracks path length of 120 cm. (author)

[en] This paper describes the performances of a large volume drift chamber with complete digitization of the output pulses. The electronics used in this test include wide-band (700 MHz) amplifiers and fast (1 Gsample/s) digitizers. The gas mixture selected for drift chamber operation (80% He-20% CH₄) and the signal processing mentioned above allow the measurement of the primary ionization clusters. The improvement in the (wire) impact parameter evaluation of the primary particle is sizeable

[en] The micro-Resistive WELL ($\mathrm{\mu <!--\; ??\; -->}$-RWELL) is a compact, simple and robust Micro-Pattern Gaseous Detector (MPGD) developed for large area HEP applications requiring the operation in harsh environment. The detector amplification stage, similar to a GEM foil, is realized with a polyimide structure micro-patterned with a blind-hole matrix, embedded through a thin Diamond-Like-Carbon (DLC) resistive layer with the readout PCB. The introduction of a resistive layer ($\mathrm{\rho <!--\; ??\; -->}=50÷<!--\; ??\; -->200$ MΩ/□) mitigating the transition from streamer to spark gives the possibility to achieve large gains ($><!--\; >\; -->{10}^4$), while affecting the detector performance in terms of rate capability. Different detector layouts have been studied: the most simple one based on a single-resistive layer, with edge grounding has been designed for low-rate applications (few tens of kHz/cm${}^2$); more sophisticated schemes have been studied for high-rate purposes ($\ge <!--\; ???\; -->10$ MHz/cm${}^2$). An overview of the different architectures studied for the high-rate version of the detector, together with their performance will be presented. The presence of the resistive layer also affects the charge spread on the strips and consequently the spatial resolution of the detector: a systematic study of the spatial resolution obtained with the charge centroid (CC) method as a function of the impinging angle was made. For non-orthogonal tracks the spatial resolution with CC method is compared with the performance obtained with the micro-TPC mode ($\mathrm{\mu <!--\; ??\; -->}$TPC): a readout approach that exploits the combined measurement of the ionization clusters time of arrival and the amplitude of the signals on the strips. Implementing the $\mathrm{\mu <!--\; ??\; -->}$TPC allows reaching an almost flat space resolution $<100\mathrm{\mu <!--\; ??\; -->}m$ for a wide angular range. Finally the results of the detector aging campaign is presented, with detectors integrating up to 175 mC/cm${}^2$ and bare DLC foils integrating a charge up to 800 mC/cm${}^2$.

[en] The KLOE-2 detector has been successfully rolled in inside the new interaction region of the DAΦNE machine, which is still in its commissioning phase. Construction of detector upgrades is in progress to provide larger acceptance both for charged particles and photons. The CCALT calorimeters will be placed in front of the inner quadrupoles, inside the apparatus, thus increasing the acceptance for prompt decay channels. They consist of two barrels of LYSO crystals, read-out with large area SiPM. This choice provides high efficiency for low energy photons and good timing performances, needed to reject machine background events. Tests of a calorimeter prototype were carried out both with electron and photon beams, showing high light yield and good timing capabilities. The construction of the CCALT detector is in progress and will be completed in few months, in time for installing it over the new interaction region

[en] The μ-RWELL is a single-amplification stage resistive Micro-Pattern Gaseous Detector (MPGD) . The detector amplification element is realized with a single copper-clad polyimide foil micro-patterned with a blind hole (well) matrix and embedded in the readout PCB through a thin Diamond-Like-Carbon (DLC) sputtered resistive film. The introduction of the resistive layer, suppressing the transition from streamer to spark, allows to achieve large gains (≥10⁴) with a single amplification stage, while partially reducing the capability to stand high particle fluxes. The simplest resistive layout, designed for low-rate applications, is based on a single-resistive layer with edge grounding. At high particle fluxes this layout suffers of a non-uniform response. In order to get rid of such a limitation different current evacuation geometries have been designed. In this work we report the study of the performance of several high rate resistive layouts tested at the CERN H8-SpS and PSI πM1 beam test facilities. These layouts fulfill the requirements for the detectors at the HL-LHC and for the experiments at the next generation colliders FCC-ee/hh and CepC.

[en] In order to reconstruct γγ physics events tagged with High Energy Tagger (HET) in the KLOE-2 (K LOng Experiment 2), we need to measure the Time Of Flight (TOF) of the electrons and positrons from the KLOE-2 Interaction Point (IP) to our tagging stations (11 m apart). The required resolution must be better than the bunch spacing (2.7 ns). We have developed and implemented on a Xilinx Virtex-5 FPGA a Time to Digital Converter (TDC) with 625 ps resolution (LSB) along with an embedded data acquisition system and the interface to the online FARM of KLOE-2. We will describe briefly the architecture of the TDC and of the Data AcQuisition (DAQ) system. Some more details will be provided about the zero-suppression algorithm used to reduce the data throughput

[en] The μ-RWELL has been conceived as a compact, simple and robust Micro-Pattern-Gaseous-Detector (MPGD) for very large area HEP applications requiring the operation in harsh environment. The detector amplification stage, similar to a GEM foil, is realized with a polyimide structure micro-patterned with a blind-hole matrix, embedded through a thin Diamond Like Carbon (DLC) resistive layer in the readout PCB. The introduction of the resistive layer strongly suppressing the transition from streamer to spark gives the possibility to achieve large gains (> 10"4), without significantly affecting the capability to stand high particle fluxes. In this work we give an overview of the two detector layouts designed for low and high rate applications, presenting the results of a systematic study of the detector performance as a function of the surface resistivity and discussing the status of the Technology Transfer towards the industry for large area detector manufacturing.

[en] The $\mathrm{\mu }$-RWELL is a compact spark-protected single amplification stage Micro-Pattern-Gaseous-Detector (MPGD). The detector amplification stage is realized with a polyimide structure, micro-patterned with a dense matrix of blind-holes, integrated into the readout structure. The anode is formed by a thin Diamond Like Carbon (DLC) resistive layer separated by an insulating glue layer from the readout strips. The introduction of the resistive layer strongly suppressing the transition from streamer to spark gives the possibility to achieve large gains ($>$ 10⁴), without significantly affecting the capability to be efficiently operated in high particle fluxes. In this work we present the results of a systematic study of the $\mathrm{\mu }$-RWELL performance as a function of the DLC resistivity. The tests have been performed either with collimated 5.9 keV X-rays or with pion and muon beams at the SPS Secondary Beamline H4 and H8 at CERN.

[en] In micro-pattern gaseous detectors (MPGD) the evaluation of the space resolution with the charge centroid method provides large uncertainty when the incident particle is not perpendicular to the readout plane. An improvement of the position reconstruction is given by the microTPC (μTPC) algorithm: the three-dimensional reconstruction of the particle track inside the detector drift gap is performed using the arrival time of the induced signals on the readout. In this work we report the application of this method to the μ-RWELL detector that, combined with the charge centroid, allows to achieve an almost uniform resolution below 100 μm over a wide angular range. (paper)

[en] The LVD detector can be defined as an underground observatory with the main objectives of studying neutrinos from stellar collapse and searching for point-like sources of gammas and neutrinos of very high energy. This multipurpose apparatus is being installed in hall A of the Gran Sasso Laboratory at a vertical depth of 3600 m.w.e. It consists of a large volume of liquid scintillator divided into modules and of a tracking system made of layers of streamer tubes. (orig./HSI)