LArPix-v2: Connectors and Cabling Discussion Dan Dwyer (LBNL) Jul. - PowerPoint PPT Presentation

LArPix-v2: Connectors and Cabling Discussion Dan Dwyer (LBNL) Jul. 18, 2019

V2 Pixel Tile: Mechanical Design V2 Pixel Tile ArgonCube Module Draft mechanical design for integration with 2x2 Demonstrator (K. Skarpass) Connector edge Jul. 18, 2019 LArPix-v2: Cables and Connectors 2

Connector/Cable Requirements Rough needs for connectors/cables for 2x2 Demonstrator Independent cable (bundle?) from each tile to flange à allow independent depowering of tile 4 cables per module corner, 16 cables per module Proposed Cable budget (per tile): Net Voltage Other N Ground VDDA +1.8 ~0.3 W/tile 4 Power (VDDA x2, VDDD x2) VDDD +0.8 to +1.8 ~0.3 W/tile Ana.Mon. 0 to VDDA - 1 Analog Monitor ADC Test 0 to VDDA - 1 ADC Test Reset 0 to VDDD CMOS, 5-10 MHz 1 Reset-Sync Ext. Trig. 0 to VDDD CMOS, 5-10 MHz 1 External Trigger CLK/~CLK 0 to VDDD See disc., 5-10 MHz 2 Clock/Anti-Clock Data I/O 0 to VDDD See disc., 5-10 MHz 16 Data I/O (4 MOSI/MISO pairs) 26 + N Gnd Total conductors à Suggests 32-pin connector? Length: ~1 m minimum to ~2 m maximum, depending on tile vertical position in 2x2 module Thermal: 87 K to room temp Chemical: Compatible with high-purity LAr (doesn’t emit electronegative impurities) Other: Negligible (<200 e- ENC) cross-talk from Clock, Data I/O to analog side (VDDA, Analog Monitor) Three options for Clock and Data I/O signals: Option A: ‘LArPix-v2-I/O’ - Complementary CMOS (pseudo-differential), direct to/from ‘head node’ LArPix ASIC on tile Option B: ‘Mitch-I/O’ - Custom discrete low-power LVDS to/from tile, small adapter circuit to/from ‘head node’ LArPix ASIC (see last week’s presentation) Option C: ‘Carl-I/O’ - Integrated low-power LVDS to/from ‘head node’ LArPix ASIC. Jul. 18, 2019 LArPix-v2: Cables and Connectors 3

Connector/Cable Implementations LArPix-v1 Approach: Standard 0.1” two-row male header pin connectors 50-pin ribbon cable with 2x25 Female crimp connectors EXO cables and connectors Advantages: - Simple, cheap, functional Disadvantages: - Unknown cryo-longevity - Susceptible to cross-talk - Large size likely an issue for constrained ArgonCube 2x2 space Some LArPix-v2 Options: Option A: EXO approach (K. Skarpass) - Etch/cut single-sided Kapton flex cables with desired geometry, bends - PEEK flex cable connector ProtoDUNE cables and connectors Option B: ProtoDUNE approach - Custom LV twisted pair bundle or data twin-axial cable bundles - 40-pin Samtec connectors (?) Option C: Other? Feedthrough: LArIAT-style Twisted pair Twin-axial - PCB used as conflat gasket, feedthrough Jul. 18, 2019 LArPix-v2: Cables and Connectors 4