A RADIO FREQUENCY CHOPPED, LOW EMITTANCE HIGH VOLTAGE ELECTRON SOURCE FOR A 30 MEV, PICOSECOND BUNCH, HIGH GRADIENT 17 GIGAHERTZ ACCELERATOR

THIS PROJECT ADDRESSES THE DESIGN AND DEVELOPMENT OF A HIGH RESOLUTION LOW EMITTANCE 30 MEV ELECTRON SOURCE FOR ADVANCED ACCELERATOR RESEARCH APPLICATIONS, AND ALSO SUPPORTS 17 GHZ LINEAR COLLIDER RESEARCH. PHASE I INVESTIGATES THE FEASIBILITY OF DESIGNING A DEMOUNTABLE TYPE 550 KV ELECTRON GUN AND COMBINING IT WITH A 17 GHZ CHOPPING AND BUNCHING SYSTEM TO PROVIDE A SOURCE OF LOW EMITTANCE, FULLY GATED RADIO FREQUENCY (RF) BUNCHES OF 10(8) TO 10 (9) ELECTRONS, HAVING NARROW MOMENTUM SPREAD AND <20 DEGREES FAHRENHEIT CENTIGRADE PHASE WIDTH AT ENTRY TO A 17 GHZ HIGH GRADIENT ACCELERATOR STRUCTURE. DETAILED BEAM OPTICS ANALYSES SHALL BE PERFORMED WITH THE OBJECTIVE OF OPTIMIZING THE SYSTEM PARAMETE2RS TO MATCH THE INJECTION REQUIREMENTS OF AN EXITING DESIGN 17 GHZ ACCELERATOR STRUCTURE, ENSURING CORRECT CAPTURE, BUNCH COMPRESSION, AND ASYMPTOTIC BUNCH LOCATION TO PROVIDE HIGH RESOLUTION PICOSECOND BUNCH (<2 DEGREES FAHRENHEIT CENTIGRADE) OPERATION OVER A WIDE RANGE OF ENERGIES UP TO 30 MEV. PRELIMINARY STUDIES OF THIS HIGH VOLTAGE (HV) INJECTOR CONCEPT INDICATE THAT STABLE INJECTED BEAMS, HAVING SMALL TRANSVERSE AND LONGITUDINAL PHASE SPACE, CAN BE ACHIEVED WITH A HIGHE2R ORDER MODE SPATIAL MODULATION AND CHARGE COMPRESSION TECHNIQUE USING RELATIVELY LOW INTENSITY RF MAGNETIC AND ELECTRIC FIELDS REQUIRING A TOTAL PEAK RF INPUT POWER OF ONLY 3 OR 4 KW. A FURTHER OBJECTIVE OF PHASE I IS TO PREPARE A TEST FACILITY LAYOUT DRAWING SHOWING A METHOD OF INTERFACING THE PROPOSED HV INJECTION SYSTEM WITH AN EXISTING HIGH POWER TRANSMITTER,AND A PROTOTYPE 17 GHZ HIGH GRADIENT STRUCTURE, AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY PLASMA FUSION CENTER. IN PHASE II, THE HV INJECTOR CENTERLINE SYSTEM SHALL BE FABRICATED AND INSTALLED IN AN EXISTING RADIATION SHIELDED FACILITY, AND THE INJECTION SYSTEM SHALL BE TESTED WITH THE HIGH GRADIENT STRUCTURE TO INVESTIGATE THE CHARACTERISTICS OF THE ACCELERATED BEAM AND EVALUATE THE POTENTIAL OF THIS UNIQUE 17 GHZ SYSTEM AS A 15 TO 30 MEV ELECTRON SOURCE FOR ADVANCED ACCELERATOR RESEARCH.