I am currently employed at Rutherford Laboratory on the ISIS pulsed neutron and muon source (an 800 MeV proton accelerator)
Prior to restarting full time employment in May 2009 my consultant activities included:
Please follow the links above to learn more about these projects/companies. In addition, here is the list of my full time employment until late 1998:
ACCELERATOR TECHNOLOGY GROUP (ATG), OXFORD INSTRUMENTS, OXFORD
June 1987 to October 1998
I took part in the development of the first commercial super-conducting electron synchrotron, assembling an engineering team to provide magnet power supplies and a radio frequency accelerating system. The customer for this was IBM. I was responsible for planning, budgeting and overall technical control of the team's tasks, including the division of the work between in-house and sub-contract manufacture. The position also involved frequent customer contact as detailed design and manufacture progressed.
My team and I manufactured or procured and commissioned a wide range of equipment, including a 50kW CW 500MHz klystron based power source, 500MHz accelerating cavity and high stability DC magnet power supplies. Although some aspects of the RF system were copied from a larger accelerator, the RF system was of a unique design. The synchrotron is now in constant use by IBM.
The synchrotron was intended principally as an X-ray source for the anticipated X-ray lithography market. Because this market has been slow to develop, ATG was re-organised in 1994 to broaden its product base and merge its operations with a separate group producing a super-conducting cyclotron for radio-active isotope production and neutron radiography.
Following the re-organisation I took over responsibility for all electrical and electronic engineering design in ATG. My team expanded to five electronics engineers. We provide support for manufacturing and commissioning in addition to further product development. Work currently includes commissioning of a second generation compact synchrotron and several large super conducting magnet instrumentation projects.
For our cyclotron range we construct our own range of 5kW 108MHz tetrode power amplifiers and for the second generation compact synchrotron we completed the in-house development of a 50kW 55MHz tetrode amplifier which must operate under conditions of extreme mismatch. This has recently proved very successful as Helios 2 recently ramped more than 600 mA to full energy (double the design current).
ATG became BS5750 (ISO9000) part 1 registered in 1994, as part of the management team working to bring this about I have gained valuable insights into the advantages and drawbacks of this quality system. Immediately prior to the re-organisation and in addition to my other responsibilities, I spent two years as Safety Officer for ATG, setting up a safety committee, defining safety policy on everything from safety glasses to chemical hazards. I produced our first written safety policy.
I acted as the industrial sponsor for an SERC CASE student who was working on a doctorate project on the development of the Z and X pinch plasma discharge as an X-ray source.
JET JOINT UNDERTAKING, ABINGDON, OXON.
June 1982 to June 1987
At JET, the European funded Tokamak nuclear fusion experiment, I was based in the Radio Frequency Heating Division. My responsibilities covered many aspects of the design and contract manufacture of 10 radio frequency power sources providing a total of 30MW between 25 and 55MHz. The installation provided Ion Cyclotron Resonance Frequency heating.
I was responsible for the satisfactory operation of the super-power tetrode based sources with variable voltage DC power supplies. Working with the Power Supplies Division, I defined the requirements and wrote the specifications for the DC supplies. These units, which employed a 1kV star point controller between a 33kV AC supply and the 400A 22kV DC output resulted in a contract worth approximately GBP 5M. I supervised the contract design and manufacture of both the radio frequency power sources and the DC power supplies through to the successful combined commissioning of both systems. During this period my responsibilities included the control of technicians for much of the installation and commissioning tasks and related work such as auxiliary power and lighting design and steel work.
Projects undertaken during this period include the specification and procurement of a 3MW broad band power combiner, writing software for analysis of power tetrode operation with reactive loading and the analysis and improvement of the ignitron power tetrode protection system.
Following the successful operation of the Ion Cyclotron Resonance Frequency heating system I took on responsibility for designing and specifying a low loss wave guide feed system for a 12MW 3.7GHz Lower Hybrid Current Drive system for JET with an eventual contract price of GBP 1.4M. The design stage involved study of various wave guide techniques including over moded and specially shaped wave guides. During this period I also specified and placed the contract for the development and manufacture of 24 700kW CW 3.7GHz test loads for the klystron power sources.
RACAL REDAC LTD, TEWKESBURY, GLOS.
September 1979 to May 1982
I joined a software group developing an electronics CAD package based on the multi-user DEC RSX11-M operating system. I completed programs for frequency domain analysis, component optimisation and filter synthesis. Subsequently I took over a production group responsible for software integration, manual preparation, marketing support, customer bench-marks, customer support and bug fixing.
GOVERNMENT COMMUNICATIONS HEADQUARTERS, CHELTENHAM
September 1975 to August 1979
This post required a 'Positive Security Vetting' and subsequent duties necessitated further special security clearances.
Responsible for antenna development and related propagation studies (20MHz to 12GHz). I carried many antenna system design projects through from initial requirements to final commissioning. All projects required special designs owing to exacting gain, bandwidth, beam shape or space requirements.
Feeling a need to broaden my experience, I then transferred to a section involved in the development of a complex computer controlled signal processing system where I gained experience in machine code and real time software development.
VOLUNTARY SERVICE OVERSEAS (VSO), PAKSE, LAOS
September 1973 to September 1974
Responsible for the maintenance and repair of a 10kW medium wave broadcasting station and studio and the training of local technicians. (This was a one year tour as a VSO volunteer, following which I took a one year MSc by examination)