FREE ELECTRON LASER WITH SAFETY CIRCUIT

摘要

In a free electron laser system with energy recovery, the system having an electron gun (110) to supply a beam of electrons; a wriggler array (114) to supply a spatially alternating magnetic field to the electron beam whereby a microwave beam (118) is generated; separating means (115) to spatially separate the microwave beam and the electron beam emerging from the wriggler array; electron collection means to receive the separated electron beam; and a high voltage, low current supply (122) and a low voltage, high current supply (124) connected in series to supply the gun (110); the high voltage supply also being connected between the electron collection means (120) and the gun (110); any instabilities are sensed by sensing the current through the high voltage supply (122); comparing the sensed current with a preset value; and disconnecting the EHT supply (122) from the gun (110) when the preset value is exceeded.