THE LASER LNTE1FEROMETER SPACE ANTENNA (LISA) CONSISTS OF THREE SUN-ORBITING SPACECRAFT THAT FORM AN EQUILATERAL TRIANGLE WITH EACH SIDE MEASURING 2.5 MILLION KILOMETERS IN LENGTH. EACH SPACECRAFT HOUSES TWO FREE-FLOATING TEST MASSES (TM) WHICH ARE PROTECTED FROM ALL DISTLLL"BING FORCES SO THAT THEY FOLLOW NEARLY PURE GEODESICS IN SPACETIME. A SINGLE TEST MASS TOGETHER WITH ITS PROTECTIVE HOUSING AND ASSOCIATED COMPONENTS IS 1 EFERRED TO AS A GRAVITATIONAL REFERENCE SENSOR (GRS). LASER INTE.RFEROMETRY IS USED TO MEASURE THE MINUTE VARIATIONS IN THE DISTANCE OR LIGHT TRAVEL TIME BETWEEN THE PURELY FREE-FAUING TMS CAUSED BY GRAVITATIONAL WAVES. THE CHARGE MANAGEMENT SYSTEM (CMS) CON TROTS THE BULK POTENTIAL OF THE TEST MASS RELATIVE TO ITS HOUSING USING UV PHOTOEMISSION WHICH IS VITAL FO1 REDUCING FORCE NOISE ACTING ON THE TEST MASS BELOW THE REQUIRED LEVEL. TEST MASS CHARGING IS CAUSED BY HIGHLY ENERGETIC PA11ICLES THAT PENETRATE THROUGH THE SPACECRAFT AND EITHER DIRECTLY OR VIA SECONDARY ELECTRON EMISSION CHARGE THE TEST MASS LEADING TO CHARGING RATES ON THE ORDER OF 50 E/S DEPENDING ON SPACECRAFT SIZE SHIELDING PROVIDED BY THE TEST MASS HOUSING AND ORBIT. THE LISA PATHFINDER CMS USED THE 254 NM UV LINE OF MERCURY LAMPS AS THE LJGHT SOURCE. WE WILL DEVELOP A CMS FOR THE L3/LISA MISSION THAT USES NEW EFFICIENT SEMICONDUCTOR UV SOURCES OPERATING AT 240-255 NM. COMPARED TO HG LAMPS UV LEDS ARC SMALLER LJGHTER CONSUME LESS POWER HAVE A WIDER SPECTRUM SELECTION A BROADER OPERATING TEMPERATURE RANGE AND A HIGHER DYNAMIC RANGE WITH AN ORDER OF MAGNITUDE IMPROVEMENT IN MOST OF THESE PERFORMANCE AREAS. THE FASTER MODULATION RATE OF UV LEDS COMPARED WITH HG LAMPS MEANS THAT AC CHARGE CONTROL IS POSSIBLE WHERE THE UV LEDS ARE SYNCHRONIZED WITH EXISTING AC ELECTRIC FIELDS INSIDE THE GRS TO INCREASE THE EFFICIENCY AND ROBUSTNESS OF THE DISCHARGING PROCESS. WE WILL ELEVATE THE TECHNICAL READINESS OF THE UV LED-BASED CMS FROM ITS CURRENT STATE OF TRL 3 TO TRL 5 BY THE END OF FISCAL YEAR 2020 AND DEVELOP A PLAN TO REACH TRL 6 BY THE END OF FISCAL YEAR 2022. TO ACHIEVE THIS OBJECTILVE WE WILL ITERATE THROUGH A SERIES OF DESIGN BUILD TEST PHASES. FOR EACH TRL INCREMENT THE CMS UNIT WILL INCREASE IN FIDELITY AND WILL BUILD UPON LESSONS LEARNED FROM THE PREVIOUS VERSION. DURING THESE ITERATIONS THE MOST ATTENTION WILL BE PAID TO THE UV LED DEVICES THEMSELVES AND THEIR FIBER COUPLING SINCE THE LEDS ARE COMMERCIAL GRADE AND NOT SPACE DESIGNED OR QUALIFIED PARTS. MOST OF THE TECHNOLOGY DEVELOPMENT EFFORT WILL OCCUR AT THE ONIVERSITY OF FLORIDA AND BE PERFORMED BY UF FAC1DTY RE$CARCH $FAFF AND GRADQATE AND 11NDERGRADQATE STQDENTS. THE UF TEAM WILL PARTNER WITH FIBERTEK INC. WHO WILL PROVIDE ENGINEERING SUPPORT ASSIST IN THE TECHNOLOGY DEVELOPMENT PLANNING THROUGH PRELIMINARY DESIGN REVIEW AND PROVIDE QUALITY ASSURANCE FOR THE PROJECT. PROVIDING THE CMS HARDWARE TO THE ESA-LED L3 MISSION WOULD GIVE NASA AN OPPORTUNITY TO BROADEN ITS INVOLVEMENT IN LISA BEYOND THE OPTICAL SUBSYSTEMS (LASER TELESCOPE PHASE METER) AND THRUSTERS THAT HAVE BEEN THE FOCUS IN THE US IN THE PAST. THE PERFORMANCE OF THE CMS IS DEEPLY INTERTWINED WITH THE DESIGN AND PERFORMANCE OF THE GRS WHICH IS ONE OF THE TWO MOST CRITICAL TECHNOLOGIES FOR SPACE GRAVITATIONAL WAVE INTERFEROMETERS. NASA'S DEVELOPMENT OF THE CMS WILL PROVIDE US SDCNTISTS WITH THE ONLY OPPORTUNITY TO GAIN INTIMATE EXPERIENCE WITH THE DESIGN PERFORMANCE AND OPERATION OF THE GRS.