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Abstract.A novel hadron calorimeter is being developed for future lepton colliding beam detectors. The calorimeter is optimized for the application of Particle Flow Algorithms (PFAs) to the measurement of hadronic jets and features a very finely segmented readout with 1 × 1 cm 2 cells. The active media of the calorimeter are Resistive Plate Chambers (RPCs) with a digital, i.e. one-bit, readout. To first order the energy of incident particles in this calorimeter is reconstructed as being proportional to the number of pads with a signal over a given threshold. A large-scale prototype calorimeter with approximately 500,000 readout channels has been built and underwent extensive testing in the Fermilab and CERN test beams. This paper reports on the design, construction, and commissioning of this prototype calorimeter.

The WADAPT consortium (Wireless Allowing Data and Power Transfer) was created to study wireless (multi-gigabit) data transfer for high-energy physics applications (LoI, CERN-LHCC-2017-002; LHCC-I-028.-2017). Emerging millimetre wave technologies allow fast signal transfer and efficient partitioning of detectors in topological regions of interest. Large bandwidths are available at those frequencies, allowing very high data rates at short range and conveniently substituting a mass of materials (cables and connectors). The Wadapt initiative aims at building proof of concept for use in future HEP experiments. For vertex detectors at HL-LHC, the bandwidth of 60 GHz is adequate and commercial products are already available, providing 6 Gbps data links. Products have been tested for signal confinement, crosstalk, electromagnetic immunity and resistance to radiation. An HEP dedicated 60 GHz Integrated Chip is being built in Heidelberg, using 130 nm SiGe BICMOS technology. It should assess the feasibility and performance of the wireless link and establish solid foundation for designing the final reading system. At longer terms, 140 GHz bands could also be used for higher data rates (> 100 Gbps) for future FCC applications. Wireless reading could widespread to many detectors, with the possibility of adding intelligence on the detector to perform fourdimensional reconstruction of the traces and vertexes online, in order to attach the traces to their vertex with great efficiency even in difficult experimental conditions. The WADAPT project includes also a long-term step aimed at transmitting energy wirelessly. This would create a new paradigm for the transmission of data and power in particle physics detectors.

A. Himmel (ahimmel@fnal.gov), Z. Djurcic (zdjurcic@anl.gov) A: The 35-ton prototype for the Deep Underground Neutrino Experiment far detector was a single-phase liquid argon time projection chamber with an integrated photon detector system, all situated inside a membrane cryostat. The detector took cosmic-ray data for six weeks during the period of February 1, 2016 to March 12, 2016. The performance of the photon detection system was checked with these data. An installed photon detector was demonstrated to measure the arrival times of cosmic-ray muons with a resolution better than 32 ns, limited by the timing of the trigger system. A measurement of the timing resolution using closely-spaced calibration pulses yielded a resolution of 15 ns for pulses at a level of 6 photo-electrons. Scintillation light from cosmic-ray muons was observed to be attenuated with increasing distance with a characteristic length of 155 ± 28 cm.

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