Abstract
This paper describes the design and construction of a low cost free electron laser (FEL) capable of operating at beam voltages below 50 kV. A novel, periodically loaded, resonant cavity has been used to provide a mechanism by which an electron beam to electromagnetic wave FEL interaction can be produced at such low beam energy. An overview of the design and operation of the system instrumentation and a distributed computer control system has been included. Essentially, the system has been developed under rigorous budgetary and time constraints in order to provide a `proof of principle' demonstration for the feasibility of low voltage FELs that are suitable for practical commercial applications and exploitation. Techniques by which the demonstration FEL produced could be scaled to produce practical amounts of output power are also discussed.
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