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As a future charge management light source, UV light-emitting diodes (UVLEDs) offer far superior performance in a range of metrics compared to themercury lamps used in the past. As part of a qualification program a number ofshort wavelength UV LEDs have been subjected to a series of lifetime tests forpotential use on the Laser Interferometer Space Antenna (LISA) mission. Thesetests were performed at realistic output levels for both fast and continuousdischarging in either a DC or pulsed mode of operation and included a DC fastdischarge test spanning 50 days, a temperature dependent pulsed fast dischargetest spanning 21 days and a pulsed continuous discharge test spanning 507 days.Two types of UV LED have demonstrated lifetimes equivalent to over 25 years ofrealistic mission usage and provide a baseline and backup solution for LISA.

Lifetime Testing UV LEDs for Use in the LISA Charge Management System