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Electrostatic charge control of isolated free-falling test masses is a keyenabling technology for space-based gravitational missions. Contact-freeelectrostatic charge control can be achieved using photoelectron emission frommetal surfaces under illumination with deep UV light. A contact-free methodminimizes force disturbances that can perturb measurements or interrupt scienceoperations. In this paper we present charge control experiments using agravitational reference sensor geometry relevant to the Laser InterferometerSpace Antenna (LISA) gravitational wave observatory in a torsion pendulumapparatus. We use a UV LED light source to control the test mass potential,taking advantage of their high bandwidth to phase-lock the light output to100kHz electric fields used for capacitive position sensing of the test mass.We demonstrate charge-rate and test mass potential control by adjustment of thephase of the light with respect to the electric field. We present a simplephysics-based model of the discharging process which explains our experimentalresults in terms of the UV light distribution in the sensor, surface workfunctions and quantum yields. A robust fitting method is used to determine thebest-fit physical parameters of the model that describe the system

Numerical Modeling and Experimental Demonstration of Pulsed Charge Control for the Space Inertial Sensor used in LISA