A WIRE SHADOW EMITTANCE SCANNER FOR PARTICLE BEAM DIAGNOSTICS

A WIRE SHADOW EMITTANCE SCANNER, SUITABLE FOR USE ON SMALL DIAMETER BEAMS FOUND IN ACCELERATORS AND BEAM TRANSPORT SYSTEMS, IS BEING DEVELOPED IN THIS PROJECT. THIS DEVICE CONSISTS OF A U-SHAPED FRAME THAT SUPPORTS FOUR THIN WIRES THAT TRAVERSE THE PARTICLE BEAM TO CREATE AND DETECT THIN SHADOWS IN THE PARTICLE DISTRIBUTION; TWO CONCAVE MIRROR LENSES; AND TWO SEGMENTED PHOTODIODE DETECTORS FOR DETECTINGTHE SHADOW LOCATIONS. THE DEVICE OFFERS SEVERAL ADCANTAGES OVER THE CONVENTIONAL MINI-EMITTANCE SCANNER: (1) IT CAN BE EXTREMELY COMPACT I.E., (1 IN. LENGTH), (2) IT CAN MEASURE THE BEAM DENSITY IN THREE-DIMENSIONAL PHASE SPACE, (3) IT CAN DETECT SOME HIGHER ORDER ABERRATIONS, (4) IT IS EXTREMELY TRANSPARENT, THEREBY ALLOWING BOTH ON-LINE AND TANDEM MEASUREMENTS OF BEAM PROPERTIES, (5) THE BEAM ENERGY IT ABSORBS IS MINIMAL, THEREBY REDUCING UNWANTED THERMAL RADIATION, VACUUM, AND NEUTRALIZATION EFFECTS, (6) IT PROMISES TO BE ECONOMICAL TO FABRICATE AND SIMPLE TO OPERATE. THIS BEAM DIAGNOSTIC DEVICE OFFERS INSIGHTS INTO BEAM PROPERTIES THAT ARE NOT AVAILABLE FROM OTHER DIAGNOSTICDEVICES. THE DATA THAT CAN BE OBTAINED WILL COMPLEMENT INCREASED EFFORTS TO CALCULATE AND UNDERSTAND HIGHER ORDER EFFECTS AND ABERRATIONS IN ACCELERATORS AND BEAM TRANSPORT SYSTEMS. IN PHASE I, ANALYSIS, DESIGN, FABRICATION, AND TEST ACTIVITIES ARE BEING CONDUCTED TO DEVELOP THIS SCANNER CONCEPT AND CARRY IT THROUGH A PRELIMINARY TEST WITH A SIMULATED BEAM (USING LIGHT) TO EXHIBIT SOME OF ITS PROPERTIES AND ESTABLISH ITS CAPABILITIES.