X-ARAPUCA as photon detection system of SBND Ana Machado for SBND Collaboration NEUTRINO 2024 June 16-22, 2024 – Milan, Italy Three LArTPC detector to study short range neutrino oscillation • Neutrino-argon interactions at GeV energy scale. Millions of nµ and thousands of ne from two neutrino beams • Verify the “low-energy excess” anomaly Investigate the excess of ne observed by MiniBooNE experiments • Search for sterile neutrino Discover or exclusion of 1 eV-scale sterile neutrino mass region • Beyond Standard Model Physics 192 X-ARAPUCA 176 ARARA readout SensL - 3x3m2 SiPM. (C-series 30050-A1) 88 VUV OPTO 400nm PTP coating EJ286 88 Visible OPTO 450nm EJ280 16 APSAIA readout Hamamatsu - 6x6m2 SiPM. (S13360-6050 VE & HS) 8 VUV OPTO 400nm PTP coating Glass to Power 8 Visible OPTO 450nm Glass to Power FILTER (400nm cutoff) PTP (emission 350nm) SiPM WLS plate LAr scintillation light FILTER (450nm cutoff) SiPM WLS plate Visible light Photon Detection System Active elements: on the PD-BOX, behind the anode. • 120 8” Hamamatsu Cryogenic PMT’s (96 TPB coated + 24 uncoated) • 192 X-ARAPUCA (96 VIS + 96 VUV) Passive element: at the cathode. Wavelength-Shifting Reflective plates (TPB coated) 64 double-sided Short Baseline Near Detector TPC Cathode Plane at -100 kV divides the detector into 2 drift volumes. Drift distance is 2 m, drift time is 1.28ms Anode Plane on either side. Each consists of 3 planes of wires with 3 mm spacing and different angle per plane. Total of 11,260 wires Cold (89K) Electronics to pre-amplify and digitize signals Field Cage that wraps around the 2 LArTPCs to step down the voltage & ensure uniform electric field of 500 V/cm. Cosmic Ray Tagger (CRT) Scintillator strips with SiPM readout 142x32 channels X-TDB X-ASB All PCB boards were tested in cryogenic temperature 60 SiPMs was tested - 48 6050-VE (VBr = +53V @RT) - 12 6050-HS (VBr = +38V @RT) A total of 777 X-TDBs were tested at the LN2 temperatures and able to see light. 704 were required. Only 1 “bad” board was identified Digitized signal from the HS test – APSAIA – ARAPUCA POWER SUPPLY AND INPUT AMPLIFIER – ARARA – ARAPUCA ANALOG READOUT AMPLIFIER Readout Electronics The APSAIA will power the SiPMs and amplify their 32 output signals. It is hosted in the outer flange of SBND. Each board has 8 channels with input connectors. The power supplies are designed to meet the SiPMs' requirements, and the amplifiers process the SiPMs' output signals. Each channel has an MCX output connector. The power supply and serial port connector use a standard DB15 connector. The supply voltage for the SiPMs is remotely adjustable up to 60 V with a resolution of less than 100mV. The power supplies and amplifiers are controlled by a microcontroller connected to an RS232C port. RJ45 à DB37, cold side view The preamplifier board conditions and biases the signal between the X-ARAPUCA light collection hardware and the signal capture hardware The bias voltage must be programmed remotely using an RS232c. The power supply is available via a cable with a DSUB9 connector. The 352 signals for flange are inputs for ARARA board. Into the ARARA board the signals are ganged by 4. RAVANA board convert signals from the ARARA to the CAEN 1740 digitizers Single-channel prototype of the pre-amplifier by AGE scientific These preamp modules are: - Double width 6U VME cards in custom crate. - Powered by externally provided 8V DC - 64 input channels for 16 output channels - Compliant with FNAL Electrical Design Standards for Electronics The amplifier characteristics are as follows: - Minimum gain of 20, adjustable via microcontroller if other gain values are needed. - Sufficient bandwidth for processing 30 ns rise-time signals, DC-coupled. - Output impedance of 50 Ω. ASSEMBLY & INSTALLATION 1o step: The assembly of the mechanical and optical parts (dichroic filters and light guide) was done at Unicamp 2 o step : The PCB board installation in each X- ARAPUCA was carried out at Fermilab. Finally, 4 VUV X-A