FAX: (01865) 273417
I am working on the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. The SemiConductor Tracker (SCT) of the ATLAS experiment contains 6.2 million channels of silicon strips. Click here for a photo of one of the 4 barrels of the SCT after assembly at Oxford .The data from the 4088 SCT modules are read out at 75 KHz and this is achieved using 8000 radiation hard optical links operating at 40 Mbits/s. I was responsible for the R&D, assembly and integration for these links. Although the SCT detector is working beautifully, there has been a very high failure rate of VCSELs (the lasers used for transmission). I am investigating VCSEL reliability and leading efforts to find reliable VCSEL systems to replace the current devices.
I am now involved in R&D for the upgraded silicon tracker that will be required for the high luminosity operation at HL-LHC, which will require a larger and much more radiation hard silicon tracking detector. I have performed calculations to determine the speed of the electrical and optical links required to readout the data from the detector. I am working with engineers on the design and fabrication of the electrical tapes required for the new tracker. I am also involved with the R&D for high speed radiation hard optical links for the HL-LHC. In Oxford we are looking at the radiation tolerance of optical fibres, cables, connectors and couplers, in the context of the CERN Versatile Link project.
In my remaining time, I supervise graduate students, performing some of the first precision Standard Model measurements with the new ATLAS data
· Sam Whitehead is measuring the asymmetry of the rate of W+ compared to W- and using this to constrain the parton distribution functions in this new kinematical domain.
· Nick Ryder is studying monojet events and will use this to make a direct measurement of the invisible width of the Z.
These are some of the critical standard model processes that are interesting and need to be understood to help constrain backgrounds for new physics searches.
I helped to create the 4th year Particle Physics course and I currently give lectures for part of this course as well as lead class discussion. I give graduate lectures on particle detectors and collider physcs.
I teach in the 2nd year electronics lab. I take Physics tutorials at St. John's college. I also supervise undergraduate project students and graduate students.