Software Support

We have developed and maintain support for comprehensive software packages used in silicon wafer testing, detector evaluation, and database interfaces. Our software is used in-house as well as by non-Cambridge institutes. The software includes:

   Back to Introduction

Mask Design

We design detectors and pitch adaptors using 4-inch and 6-inch wafer technology using CADENCE Design Framework II running on a SUN Ultra1 workstation. Recent detector design projects include:

We have also designed customised pitch adaptors for specialised detector readout studies.

  Back to Home Page

Detector Test Facilities

We have dedicated cleanroom for the probing and testing of silicon devices. Our facilities include:

Summit 10K automatic (PC-controlled) probestation from Cascade Microtech
Wentworth manual probestation
K&S 4129 Deep Access Bonder
K&S 1470 automatic bonder for production wire bonding
Environment Chamber from Design Environmental Ltd for irradiated detector annealing and temperature cycling tests
Bosch freezers for irradiated detector storage and testing
Measurements are performed using a range of instrumentation from KeithleyHewlitt-Packard , Wayne-Kerr and Pickering Interfaces:
Keithley 487 Volt Source/Picoammeter - "workhorse" for IV scans and I measurements / Vsource
Keithley 6517 Electrometer - IV scans, VV scans, High voltage source (up to 1000V)
Keithley 2000 DMM - for current, voltage, temperature measurements etc
WayneKerr 6425 - CV measurements from 30Hz to 300kHz
Hewlit-Packard 4263B - CV to 100kHz
Pickering 360-20 4x36 matrix for switching applications
All measurements (eg IV, CV, strip probing, etc) are generally fully automated under PC control (via IEEEbus) using  LabView . LabView also manages data storage, analysis and plotting.

  Back to Introduction

Picture Gallery
LBIC/CDP binary irradiation assembly bonded to an irradiated ATLAS detector.
Closeup of bonding to LBIC/CDP Wires here are 25micron thick.
Bonding to a FELIX-128 analogue chip
IV measurements in progress The irradiated detector is in the freezer on the right.
Summit 10K automatic probestation
K&S Deep Access Bonder
K&S 1470 automatic bonder
Environment chamber
Strip probing with the Summit probestation

  Back to Introduction

Detector Readout

We use both analogue and binary readout systems for the evaluation of the devices as particle detectors, together with beta sources or laser.
The analogue SCT128A (and before that the FELIX) chips have been used extensively for Signal/Noise studies of irradiated detectors (using a Ru-106 beta source). For binary readout at 40MHz we have used reusable (rebondable) modules using LBIC/CDP and more recently ABCD systems for SCT strip noise studies. 

  Back to Introduction


Personnel involved directly with cleanroom activities are:

Janet Carter Group Leader
Dave Robinson Senior Research Associate
Brian Fromant Mechanical engineer / Cleanroom technician
Other group members working with silicon on ATLAS:

Maurice Goodrick Electronics engineer
John Hill DAQ
Andy Parker 

  Back to Introduction