ArgonCube 2x2 Cabling and grounding F. Piastra 31.10.2019
Power connections/grounding DAQ rack HVPS HV Power (phases) SYx527 crate Cryostat Detector grounded at the ground HV-FT HV-FT LVPS (<10V) (at the rack) G VME crate NIM crate DAQ server HV connection to cathode plane Common (neutral) Copper braid (optional) Saturable inductor Building ground Insulation
Light readout chain Cold side: Potted feedthrough in CF-60 flange: 8 connectors serve • 24 modules (12 ArCLight + 12 LCM). Micro-coax cables for SiPM biasing and signal readout. • Warm side: CAEN A7040AN for SiPM biasing in SYx527 crate: 48 • programmable HV channels, floating HV return. Driver amplifiers box for differential signal transmission • on screened ribbon twisted pair cable. JINR-ADC in VME crate: 64 differential analog pairs • inputs, ethernet interface to acquisition PC. Knut Skarpaas, 2019 JINR-ADC CAEN A7040
Light readout chain Cryostat Driver amp. box DAQ rack DCDC LV-PS LV stabiliser Components grounded in the amp box CAEN 7040 CAEN 7040 HV Ch.0 Ch0 CAEN 7040 HV Ch.N SiPM and pre-amp. Detector ground reference JINR ADC Clean ground from cryostat
Charge readout chain Cold side: • Each LArPix board is served by a 34 wires ribbon cable from custom feedthrough. • Feedthrough: round PCB with copper plating for CF-60 flange sealing, 8x 34-pin feedthroughs. Warm side: • Read out board in NIM module: XILINX ArtyZ7 board, data transmission, analog monitor, ADC test, synchronisation tasks. • Direct connection of 34-wire ribbon cables to read out electronics. • 2x NIM modules per TPC: 4 pixel tiles each module Knut Skarpaas, 2019
Charge readout chain Cryostat Driver amp. box DAQ rack Power supply DCDC LV-PS LV stabiliser Components NIM module LArPix grounded in the amp box Digital lines FPGA Pulse in Analog line (pulser) Analog out Analog monitor Clean ground from cryostat
Slow monitor/control chain • Pressure transmitters: • 4 - 20 mA current loops SC rack • No ground connection from PLC to sensors • Temperature transmitters: • 4 - 20 mA current loops • No ground connection from PLC to Valves control sensors • RaspberryPi reads levelmeter on detector ground, transmission over unshielded ethernet (UTP). PLC • Feedthroughs: • Commercial CF60 with D-sub pins for T sensors, valves control • Custom made potted FT for VFD line: 3 phases, 1 ground wire and LAr pumps shield not in connection with the control (VFD detector GND drivers) • TBD: Additional insulation from FT flanges and the module or cryostat Building ground
Slow monitor/control chain • Bistable valves: activated by current spikes, no ground connections. • Feedthroughs are multi-pin sockets/plugs on standard stainless steel flanges (CF40 and CF60). • Shielding of the cables are grounded at the rack side and floating at detector side
Slow monitor/control chain Potted FT for VFD line: • Cable shield insulated from flanges and metal components • Vacuum tested down to 10 -3 mbar Motor pumps: • Encasing grounded to the VFD line shield (building ground) • Dielectric breakers to insulate pumps body from flanges, cryostat and pipes
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