RD50-MCz Version 3
April 27, 2009
The project is to fabricate a Printed Circuit Board for mounting a Silicon Strip
detector and Hybrid electronics. The board is an octagon shape, single sided 0.0937" thick.
There are alignment holes, mounting holes and vacuum holes.
- The board has silk screening to aide aligning the sensor and hybrid for gluing.
- Solder mask under the devices provides an area where glue is applied.
- Holes under the sensor and hybrid are used with vacuum to hold the devices while
glue is setting.
- Pads under the sensor make contact with the aluminum base using silver epoxy.
- A hole is provided, under the sensor, for attaching a temperature sensor.
- Thermal management is provided to remove approximately 1-Watt of heat from the detector.
The circuit board material is selected for improved thermal conductivity and copper areas
are used to conduct heat away from the sensor and into the brass mounting ring.
- Board Material (to be selected), 0.0937" thick.
- Circuit traces are gold plated 1/2Oz. copper, 0.7mils thick (0.018mm)
- Typical thickness of LPI solder mask is 1.5mils (0.04mm)
- Silk screening marks the corners of sensor and hybrid.
- There is a current limiting resistor (1206 size) on the high voltage trace.
- There is a location (1206 size) on the high voltage trace for a filter capacitor.
- Holes are to be within a +/-0.01mm tolerance
- Board accommodates a sensor type 43x41mm
- General Board size 120 x 170 mm
- There are 8 alignment hole for 4mm dowels
- Sensor has 640 Channels on a 60 micron pitch
- Hybrid has 6 chips with 128 channels/chip (768-channels)
- Align channel one of the hybrid with channel one of the sensor
- Shift hybrid 64 x 60um to match chan 1 - chan 1 (3.84mm)
- Leave 1mm between the hybrid and the sensor
- A new fanout section will be made to match the hybrid pitch to the sensor pitch
- A 'moat' will be made around the edge of the sensor and the hybrid using a solder mask 4mm wide
this will allow space for gluing
- Holes under the sensor and hybrid allow vacuum to assist holding the pieces down
during the gluing process.