Ecal Connection board and Motherboard design. Connection Board Motherboard.

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Presentation transcript:

Ecal Connection board and Motherboard design

Connection Board Motherboard

Connection Board The connection board links the APD on one side and Preamplifier on the other side:  Connection from the APDs to the Board is by 2 twisted wires.  Connection from the Board to Amplifier is by 3 pin socket. There are also preamplifier support rails soldered on the board to hold the amplifiers in place. The board provides thermal screen and provides ground link between the APD and preamplifiers. 10 Crystals high ~ 160mm (6.3in) 25mm 46 Crystals across ~ 736mm (29in) 23 Crystals 21 Crystals 23 Crystals y x 16mm 111 Crystals per Quadrant Total Crystals = 444 DC BA

HPS ECal Motherboard DVCS 2005 Inner Calorimeter Motherboard Slotted Motherboard

50mm DC BA 125mm (4.92in) 986mm (38.8in) 160mm (6.3in) High Voltage Connector Low Voltage Connector Preamp signals 111 Crystals Quadrant B Connectors Quadrant C Connectors Quadrant A Connectors Quadrant D Connectors 8-Pin Connectors 8-Pin Connector (HE804EN17YOA401) (Molex_ )

50mm DC BA 786mm (31in) 220mm (8.7in) High Voltage Connector Low Voltage Connector Preamp signals 111 Crystals HV/LV Connectors Quadrant C Connectors 8-Pin Connectors (HE804EN17YOA401) (Molex_ ) Quadrant B ConnectorsQuadrant A Connectors Quadrant D Connectors HV/LV Connectors

16mm 80mm (3.15in) 46 Crystals across ~ 736mm (29in) 25mm 21 Crystals across ~ 336mm (13.2in) 5 Crystals high ~ 80mm (3.15in) Slotted Motherboard Board Cutout Connector Footprint 16mm GND Signal GND HV -5V +5V 12.6mm 6.3mm

Proposed non-slotted Motherboard The preamplifier output signals have to be sandwiched between two ground strips (on the motherboard) to reduce crosstalk. This increases routing complexity. To reduce noise on the signals, the following Motherboard design is proposed:  Move the existing APD connector to the backside of the motherboard (side with the APD).  Put a LEMO connector on the frontside of the motherboard.  Connect directly to the readout boards from the from motherboard. To Readout Module Connection Board Motherboard Crystal Preamplifier

16mm 80mm (3.15in) 46 Crystals across ~ 736mm (29in) 25mm 21 Crystals across ~ 336mm (13.2in) 5 Crystals high ~ 80mm (3.15in) Precidip 802-PP- NNN Connector Footprint (12.7mm X 8.5mm) 16mm Backside View Lemo EPB NTN Connector Footprint (7mm X7mm) GND Signal GND HV -5V +5V

16mm 80mm (3.15in) 46 Crystals across ~ 736mm (29in) 25mm 21 Crystals across ~ 336mm (13.2in) 5 Crystals high ~ 80mm (3.15in) Connector Footprint (7mm X 7mm) 16mm Frontside View Not to scale LEMO EPB NTN HV & LV Connectors

Summary  Discussion of alternative motherboard design.  How does it affect Mechanical design by adding ~ 6inches separation between motherboard and connection board? Slotted vs non-slotted Pros Easier design = Less labor during routing. Reduce Signal Integrity concerns. Access to individual crystal signal for readout. Slotted motherboard is flimsier. Cons: Might need another “dummy” slotted board to support the preamp. Lemo connectors ~ $10 each.

Questions and/or Comments