PRECISION UNDULATOR ADJUSTMENT TOOL

THE DEVELOPMENT OF FREE ELECTRON LASER LIGHT SOURCES IN THE XUV REQUIRES THE USE OF LONG, HIGH PRECISION UNDULATORS. NOUNDULATOR WITH THE REQUIRED QUALITY HAS YET BEEN ATTEMPTED BECAUSE OF THE LACK OF THE APPROPRIATE MEASUREMENT TECHNOLOGY. MEANS ARE NEEDED FOR MEASURING THE ELECTRON TRAJECTORY SO THAT THE FIELD ERRORS CAN BE CORRECTED. THE AVAILABLE APPROACHES (HALL PROBES, PULSED WIRE) ARE SENSITIVE EITHER TO THE FIRST OR SECOND DERIVATIVE OF THE TRAJECTORY. AS A RESULT, THE MEASUREMENT ERRORS ACCUMULATE IN THE CALCULATION OF THE TRAJECTORY ITSELF, MAKING THESE TECHNIQUES INEFFECTIVE FOR THE ADJUSTMENT OF LONG WIGGLERS. WE PROPOSE TO ADAPT THE ION BEAM TECHNOLOGY HERETOFORE USED TO ADJUST WIGGLERS IN THE INFRARED. THIS ADAPTATION REQUIRES THE DEVELOPMENT OF A NEW DETECTION TECHNOLOGY WITH A PRECISION APPROPRIATE TO THE XUV APPLICATION. WE HAVE DEVELOPED THE CONCEPT FOR SUCH A DETECTION SYSTEM, AND PLAN TO OPTIMIZE ITS DESIGN AND DEMONSTRATE ITS PRECISION EXPERIMENTALLY IN THE PHASE I PROGRAM. IF WE ARE SUCCESSFUL, IN PHASE II WE WOULD ASSEMBLE A PROTOTYPE ION BEAM SYSTEM, AND USE IT TO DEMONSTRATE THE PRECISION TO WHICH ONE CAN TRIM UP THE FIELDS OF A LONG UNDULATOR. OUR APPROACH WILL MAKE POSSIBLE THE CONSTRUCTION OF THE HIGH PRECISION LONG UNDULATORS REQUIRED FOR CONSTRUCTING FREE ELECTRON LASER LIGHT SOURCES IN THE XUV REGION AND BEYOND.